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848 lines
30 KiB
C++
848 lines
30 KiB
C++
/**********************************************************************
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* File: blobbox.h (Formerly blobnbox.h)
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* Description: Code for the textord blob class.
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* Author: Ray Smith
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* Created: Thu Jul 30 09:08:51 BST 1992
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*
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* (C) Copyright 1992, Hewlett-Packard Ltd.
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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** http://www.apache.org/licenses/LICENSE-2.0
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*
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**********************************************************************/
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#ifndef BLOBBOX_H
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#define BLOBBOX_H
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#include "clst.h"
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#include "elst2.h"
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#include "werd.h"
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#include "ocrblock.h"
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#include "statistc.h"
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enum PITCH_TYPE
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{
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PITCH_DUNNO, // insufficient data
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PITCH_DEF_FIXED, // definitely fixed
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PITCH_MAYBE_FIXED, // could be
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PITCH_DEF_PROP,
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PITCH_MAYBE_PROP,
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PITCH_CORR_FIXED,
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PITCH_CORR_PROP
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};
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// The possible tab-stop types of each side of a BLOBNBOX.
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// The ordering is important, as it is used for deleting dead-ends in the
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// search. ALIGNED, CONFIRMED and VLINE should remain greater than the
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// non-aligned, unset, or deleted members.
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enum TabType {
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TT_NONE, // Not a tab.
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TT_DELETED, // Not a tab after detailed analysis.
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TT_MAYBE_RAGGED, // Initial designation of a tab-stop candidate.
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TT_MAYBE_ALIGNED, // Initial designation of a tab-stop candidate.
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TT_CONFIRMED, // Aligned with neighbours.
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TT_VLINE // Detected as a vertical line.
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};
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// The possible region types of a BLOBNBOX.
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// Note: keep all the text types > BRT_UNKNOWN and all the image types less.
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// Keep in sync with kBlobTypes in colpartition.cpp and BoxColor, and the
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// *Type static functions below.
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enum BlobRegionType {
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BRT_NOISE, // Neither text nor image.
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BRT_HLINE, // Horizontal separator line.
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BRT_VLINE, // Vertical separator line.
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BRT_RECTIMAGE, // Rectangular image.
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BRT_POLYIMAGE, // Non-rectangular image.
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BRT_UNKNOWN, // Not determined yet.
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BRT_VERT_TEXT, // Vertical alignment, not necessarily vertically oriented.
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BRT_TEXT, // Convincing text.
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BRT_COUNT // Number of possibilities.
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};
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// enum for elements of arrays that refer to neighbours.
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// NOTE: keep in this order, so ^2 can be used to flip direction.
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enum BlobNeighbourDir {
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BND_LEFT,
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BND_BELOW,
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BND_RIGHT,
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BND_ABOVE,
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BND_COUNT
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};
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// enum for special type of text characters, such as math symbol or italic.
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enum BlobSpecialTextType {
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BSTT_NONE, // No special.
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BSTT_ITALIC, // Italic style.
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BSTT_DIGIT, // Digit symbols.
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BSTT_MATH, // Mathmatical symobls (not including digit).
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BSTT_UNCLEAR, // Characters with low recognition rate.
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BSTT_SKIP, // Characters that we skip labeling (usually too small).
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BSTT_COUNT
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};
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inline BlobNeighbourDir DirOtherWay(BlobNeighbourDir dir) {
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return static_cast<BlobNeighbourDir>(dir ^ 2);
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}
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// BlobTextFlowType indicates the quality of neighbouring information
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// related to a chain of connected components, either horizontally or
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// vertically. Also used by ColPartition for the collection of blobs
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// within, which should all have the same value in most cases.
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enum BlobTextFlowType {
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BTFT_NONE, // No text flow set yet.
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BTFT_NONTEXT, // Flow too poor to be likely text.
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BTFT_NEIGHBOURS, // Neighbours support flow in this direction.
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BTFT_CHAIN, // There is a weak chain of text in this direction.
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BTFT_STRONG_CHAIN, // There is a strong chain of text in this direction.
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BTFT_TEXT_ON_IMAGE, // There is a strong chain of text on an image.
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BTFT_LEADER, // Leader dots/dashes etc.
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BTFT_COUNT
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};
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// Returns true if type1 dominates type2 in a merge. Mostly determined by the
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// ordering of the enum, LEADER is weak and dominates nothing.
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// The function is anti-symmetric (t1 > t2) === !(t2 > t1), except that
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// this cannot be true if t1 == t2, so the result is undefined.
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inline bool DominatesInMerge(BlobTextFlowType type1, BlobTextFlowType type2) {
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// LEADER always loses.
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if (type1 == BTFT_LEADER) return false;
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if (type2 == BTFT_LEADER) return true;
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// With those out of the way, the ordering of the enum determines the result.
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return type1 >= type2;
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}
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namespace tesseract {
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class ColPartition;
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}
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class BLOBNBOX;
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ELISTIZEH (BLOBNBOX)
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class BLOBNBOX:public ELIST_LINK
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{
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public:
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BLOBNBOX() {
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ConstructionInit();
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}
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explicit BLOBNBOX(C_BLOB *srcblob) {
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box = srcblob->bounding_box();
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ConstructionInit();
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cblob_ptr = srcblob;
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area = static_cast<int>(srcblob->area());
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}
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~BLOBNBOX() {
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if (owns_cblob_) delete cblob_ptr;
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}
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static BLOBNBOX* RealBlob(C_OUTLINE* outline) {
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C_BLOB* blob = new C_BLOB(outline);
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return new BLOBNBOX(blob);
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}
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// Rotates the box and the underlying blob.
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void rotate(FCOORD rotation);
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// Methods that act on the box without touching the underlying blob.
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// Reflect the box in the y-axis, leaving the underlying blob untouched.
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void reflect_box_in_y_axis();
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// Rotates the box by the angle given by rotation.
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// If the blob is a diacritic, then only small rotations for skew
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// correction can be applied.
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void rotate_box(FCOORD rotation);
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// Moves just the box by the given vector.
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void translate_box(ICOORD v) {
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if (IsDiacritic()) {
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box.move(v);
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base_char_top_ += v.y();
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base_char_bottom_ += v.y();
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} else {
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box.move(v);
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set_diacritic_box(box);
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}
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}
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void merge(BLOBNBOX *nextblob);
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void really_merge(BLOBNBOX* other);
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void chop( // fake chop blob
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BLOBNBOX_IT *start_it, // location of this
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BLOBNBOX_IT *blob_it, // iterator
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FCOORD rotation, // for landscape
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float xheight); // line height
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void NeighbourGaps(int gaps[BND_COUNT]) const;
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void MinMaxGapsClipped(int* h_min, int* h_max,
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int* v_min, int* v_max) const;
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void CleanNeighbours();
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// Returns positive if there is at least one side neighbour that has a
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// similar stroke width and is not on the other side of a rule line.
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int GoodTextBlob() const;
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// Returns the number of side neighbours that are of type BRT_NOISE.
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int NoisyNeighbours() const;
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// Returns true if the blob is noise and has no owner.
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bool DeletableNoise() const {
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return owner() == nullptr && region_type() == BRT_NOISE;
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}
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// Returns true, and sets vert_possible/horz_possible if the blob has some
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// feature that makes it individually appear to flow one way.
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// eg if it has a high aspect ratio, yet has a complex shape, such as a
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// joined word in Latin, Arabic, or Hindi, rather than being a -, I, l, 1.
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bool DefiniteIndividualFlow();
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// Returns true if there is no tabstop violation in merging this and other.
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bool ConfirmNoTabViolation(const BLOBNBOX& other) const;
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// Returns true if other has a similar stroke width to this.
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bool MatchingStrokeWidth(const BLOBNBOX& other,
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double fractional_tolerance,
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double constant_tolerance) const;
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// Returns a bounding box of the outline contained within the
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// given horizontal range.
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TBOX BoundsWithinLimits(int left, int right);
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// Estimates and stores the baseline position based on the shape of the
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// outline.
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void EstimateBaselinePosition();
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// Simple accessors.
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const TBOX& bounding_box() const {
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return box;
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}
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// Set the bounding box. Use with caution.
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// Normally use compute_bounding_box instead.
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void set_bounding_box(const TBOX& new_box) {
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box = new_box;
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base_char_top_ = box.top();
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base_char_bottom_ = box.bottom();
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}
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void compute_bounding_box() {
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box = cblob_ptr->bounding_box();
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base_char_top_ = box.top();
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base_char_bottom_ = box.bottom();
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baseline_y_ = box.bottom();
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}
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const TBOX& reduced_box() const {
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return red_box;
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}
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void set_reduced_box(TBOX new_box) {
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red_box = new_box;
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reduced = true;
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}
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int32_t enclosed_area() const {
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return area;
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}
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bool joined_to_prev() const {
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return joined != 0;
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}
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bool red_box_set() const {
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return reduced != 0;
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}
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int repeated_set() const {
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return repeated_set_;
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}
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void set_repeated_set(int set_id) {
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repeated_set_ = set_id;
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}
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C_BLOB *cblob() const {
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return cblob_ptr;
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}
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TabType left_tab_type() const {
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return left_tab_type_;
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}
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void set_left_tab_type(TabType new_type) {
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left_tab_type_ = new_type;
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}
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TabType right_tab_type() const {
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return right_tab_type_;
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}
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void set_right_tab_type(TabType new_type) {
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right_tab_type_ = new_type;
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}
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BlobRegionType region_type() const {
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return region_type_;
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}
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void set_region_type(BlobRegionType new_type) {
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region_type_ = new_type;
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}
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BlobSpecialTextType special_text_type() const {
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return spt_type_;
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}
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void set_special_text_type(BlobSpecialTextType new_type) {
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spt_type_ = new_type;
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}
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BlobTextFlowType flow() const {
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return flow_;
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}
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void set_flow(BlobTextFlowType value) {
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flow_ = value;
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}
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bool vert_possible() const {
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return vert_possible_;
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}
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void set_vert_possible(bool value) {
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vert_possible_ = value;
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}
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bool horz_possible() const {
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return horz_possible_;
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}
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void set_horz_possible(bool value) {
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horz_possible_ = value;
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}
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int left_rule() const {
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return left_rule_;
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}
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void set_left_rule(int new_left) {
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left_rule_ = new_left;
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}
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int right_rule() const {
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return right_rule_;
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}
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void set_right_rule(int new_right) {
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right_rule_ = new_right;
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}
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int left_crossing_rule() const {
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return left_crossing_rule_;
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}
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void set_left_crossing_rule(int new_left) {
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left_crossing_rule_ = new_left;
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}
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int right_crossing_rule() const {
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return right_crossing_rule_;
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}
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void set_right_crossing_rule(int new_right) {
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right_crossing_rule_ = new_right;
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}
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float horz_stroke_width() const {
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return horz_stroke_width_;
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}
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void set_horz_stroke_width(float width) {
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horz_stroke_width_ = width;
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}
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float vert_stroke_width() const {
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return vert_stroke_width_;
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}
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void set_vert_stroke_width(float width) {
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vert_stroke_width_ = width;
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}
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float area_stroke_width() const {
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return area_stroke_width_;
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}
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tesseract::ColPartition* owner() const {
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return owner_;
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}
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void set_owner(tesseract::ColPartition* new_owner) {
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owner_ = new_owner;
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}
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bool leader_on_left() const {
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return leader_on_left_;
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}
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void set_leader_on_left(bool flag) {
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leader_on_left_ = flag;
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}
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bool leader_on_right() const {
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return leader_on_right_;
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}
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void set_leader_on_right(bool flag) {
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leader_on_right_ = flag;
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}
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BLOBNBOX* neighbour(BlobNeighbourDir n) const {
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return neighbours_[n];
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}
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bool good_stroke_neighbour(BlobNeighbourDir n) const {
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return good_stroke_neighbours_[n];
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}
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void set_neighbour(BlobNeighbourDir n, BLOBNBOX* neighbour, bool good) {
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neighbours_[n] = neighbour;
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good_stroke_neighbours_[n] = good;
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}
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bool IsDiacritic() const {
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return base_char_top_ != box.top() || base_char_bottom_ != box.bottom();
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}
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int base_char_top() const {
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return base_char_top_;
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}
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int base_char_bottom() const {
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return base_char_bottom_;
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}
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int baseline_position() const {
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return baseline_y_;
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}
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int line_crossings() const {
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return line_crossings_;
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}
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void set_line_crossings(int value) {
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line_crossings_ = value;
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}
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void set_diacritic_box(const TBOX& diacritic_box) {
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base_char_top_ = diacritic_box.top();
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base_char_bottom_ = diacritic_box.bottom();
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}
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BLOBNBOX* base_char_blob() const {
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return base_char_blob_;
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}
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void set_base_char_blob(BLOBNBOX* blob) {
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base_char_blob_ = blob;
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}
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void set_owns_cblob(bool value) { owns_cblob_ = value; }
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bool UniquelyVertical() const {
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return vert_possible_ && !horz_possible_;
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}
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bool UniquelyHorizontal() const {
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return horz_possible_ && !vert_possible_;
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}
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// Returns true if the region type is text.
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static bool IsTextType(BlobRegionType type) {
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return type == BRT_TEXT || type == BRT_VERT_TEXT;
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}
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// Returns true if the region type is image.
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static bool IsImageType(BlobRegionType type) {
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return type == BRT_RECTIMAGE || type == BRT_POLYIMAGE;
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}
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// Returns true if the region type is line.
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static bool IsLineType(BlobRegionType type) {
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return type == BRT_HLINE || type == BRT_VLINE;
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}
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// Returns true if the region type cannot be merged.
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static bool UnMergeableType(BlobRegionType type) {
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return IsLineType(type) || IsImageType(type);
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}
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// Helper to call CleanNeighbours on all blobs on the list.
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static void CleanNeighbours(BLOBNBOX_LIST* blobs);
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// Helper to delete all the deletable blobs on the list.
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static void DeleteNoiseBlobs(BLOBNBOX_LIST* blobs);
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// Helper to compute edge offsets for all the blobs on the list.
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// See coutln.h for an explanation of edge offsets.
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static void ComputeEdgeOffsets(Pix* thresholds, Pix* grey,
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BLOBNBOX_LIST* blobs);
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#ifndef GRAPHICS_DISABLED
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// Helper to draw all the blobs on the list in the given body_colour,
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// with child outlines in the child_colour.
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static void PlotBlobs(BLOBNBOX_LIST* list,
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ScrollView::Color body_colour,
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ScrollView::Color child_colour,
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ScrollView* win);
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// Helper to draw only DeletableNoise blobs (unowned, BRT_NOISE) on the
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// given list in the given body_colour, with child outlines in the
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// child_colour.
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static void PlotNoiseBlobs(BLOBNBOX_LIST* list,
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ScrollView::Color body_colour,
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ScrollView::Color child_colour,
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ScrollView* win);
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static ScrollView::Color TextlineColor(BlobRegionType region_type,
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BlobTextFlowType flow_type);
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// Keep in sync with BlobRegionType.
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ScrollView::Color BoxColor() const;
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void plot(ScrollView* window, // window to draw in
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ScrollView::Color blob_colour, // for outer bits
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ScrollView::Color child_colour); // for holes
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#endif
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// Initializes the bulk of the members to default values for use at
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// construction time.
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void ConstructionInit() {
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cblob_ptr = nullptr;
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owns_cblob_ = false;
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area = 0;
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area_stroke_width_ = 0.0f;
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horz_stroke_width_ = 0.0f;
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vert_stroke_width_ = 0.0f;
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ReInit();
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}
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// Initializes members set by StrokeWidth and beyond, without discarding
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// stored area and strokewidth values, which are expensive to calculate.
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void ReInit() {
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joined = false;
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reduced = false;
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repeated_set_ = 0;
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left_tab_type_ = TT_NONE;
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right_tab_type_ = TT_NONE;
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region_type_ = BRT_UNKNOWN;
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flow_ = BTFT_NONE;
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spt_type_ = BSTT_SKIP;
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left_rule_ = 0;
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right_rule_ = 0;
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left_crossing_rule_ = 0;
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right_crossing_rule_ = 0;
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if (area_stroke_width_ == 0.0f && area > 0 && cblob() != nullptr
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&& cblob()->perimeter()!=0)
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area_stroke_width_ = 2.0f * area / cblob()->perimeter();
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owner_ = nullptr;
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base_char_top_ = box.top();
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base_char_bottom_ = box.bottom();
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baseline_y_ = box.bottom();
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line_crossings_ = 0;
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base_char_blob_ = nullptr;
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horz_possible_ = false;
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vert_possible_ = false;
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leader_on_left_ = false;
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leader_on_right_ = false;
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ClearNeighbours();
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}
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void ClearNeighbours() {
|
|
for (int n = 0; n < BND_COUNT; ++n) {
|
|
neighbours_[n] = nullptr;
|
|
good_stroke_neighbours_[n] = false;
|
|
}
|
|
}
|
|
|
|
private:
|
|
C_BLOB *cblob_ptr; // edgestep blob
|
|
TBOX box; // bounding box
|
|
TBOX red_box; // bounding box
|
|
int area:30; // enclosed area
|
|
unsigned joined : 1; // joined to prev
|
|
unsigned reduced : 1; // reduced box set
|
|
int repeated_set_; // id of the set of repeated blobs
|
|
TabType left_tab_type_; // Indicates tab-stop assessment
|
|
TabType right_tab_type_; // Indicates tab-stop assessment
|
|
BlobRegionType region_type_; // Type of region this blob belongs to
|
|
BlobTextFlowType flow_; // Quality of text flow.
|
|
int16_t left_rule_; // x-coord of nearest but not crossing rule line
|
|
int16_t right_rule_; // x-coord of nearest but not crossing rule line
|
|
int16_t left_crossing_rule_; // x-coord of nearest or crossing rule line
|
|
int16_t right_crossing_rule_; // x-coord of nearest or crossing rule line
|
|
int16_t base_char_top_; // y-coord of top/bottom of diacritic base,
|
|
int16_t base_char_bottom_; // if it exists else top/bottom of this blob.
|
|
int16_t baseline_y_; // Estimate of baseline position.
|
|
int line_crossings_; // Number of line intersections touched.
|
|
BLOBNBOX* base_char_blob_; // The blob that was the base char.
|
|
float horz_stroke_width_; // Median horizontal stroke width
|
|
float vert_stroke_width_; // Median vertical stroke width
|
|
float area_stroke_width_; // Stroke width from area/perimeter ratio.
|
|
tesseract::ColPartition* owner_; // Who will delete me when I am not needed
|
|
BlobSpecialTextType spt_type_; // Special text type.
|
|
BLOBNBOX* neighbours_[BND_COUNT];
|
|
bool good_stroke_neighbours_[BND_COUNT];
|
|
bool horz_possible_; // Could be part of horizontal flow.
|
|
bool vert_possible_; // Could be part of vertical flow.
|
|
bool leader_on_left_; // There is a leader to the left.
|
|
bool leader_on_right_; // There is a leader to the right.
|
|
// Iff true, then the destructor should delete the cblob_ptr.
|
|
// TODO(rays) migrate all uses to correctly setting this flag instead of
|
|
// deleting the C_BLOB before deleting the BLOBNBOX.
|
|
bool owns_cblob_;
|
|
};
|
|
|
|
class TO_ROW: public ELIST2_LINK
|
|
{
|
|
public:
|
|
static const int kErrorWeight = 3;
|
|
|
|
TO_ROW() {
|
|
clear();
|
|
} //empty
|
|
TO_ROW( //constructor
|
|
BLOBNBOX *blob, //from first blob
|
|
float top, //of row //target height
|
|
float bottom,
|
|
float row_size);
|
|
|
|
void print() const;
|
|
float max_y() const { //access function
|
|
return y_max;
|
|
}
|
|
float min_y() const {
|
|
return y_min;
|
|
}
|
|
float mean_y() const {
|
|
return (y_min + y_max) / 2.0f;
|
|
}
|
|
float initial_min_y() const {
|
|
return initial_y_min;
|
|
}
|
|
float line_m() const { //access to line fit
|
|
return m;
|
|
}
|
|
float line_c() const {
|
|
return c;
|
|
}
|
|
float line_error() const {
|
|
return error;
|
|
}
|
|
float parallel_c() const {
|
|
return para_c;
|
|
}
|
|
float parallel_error() const {
|
|
return para_error;
|
|
}
|
|
float believability() const { //baseline goodness
|
|
return credibility;
|
|
}
|
|
float intercept() const { //real parallel_c
|
|
return y_origin;
|
|
}
|
|
void add_blob( //put in row
|
|
BLOBNBOX *blob, //blob to add
|
|
float top, //of row //target height
|
|
float bottom,
|
|
float row_size);
|
|
void insert_blob( //put in row in order
|
|
BLOBNBOX *blob);
|
|
|
|
BLOBNBOX_LIST *blob_list() { //get list
|
|
return &blobs;
|
|
}
|
|
|
|
void set_line( //set line spec
|
|
float new_m, //line to set
|
|
float new_c,
|
|
float new_error) {
|
|
m = new_m;
|
|
c = new_c;
|
|
error = new_error;
|
|
}
|
|
void set_parallel_line( //set fixed gradient line
|
|
float gradient, //page gradient
|
|
float new_c,
|
|
float new_error) {
|
|
para_c = new_c;
|
|
para_error = new_error;
|
|
credibility =
|
|
(float) (blobs.length () - kErrorWeight * new_error);
|
|
y_origin = (float) (new_c / sqrt (1 + gradient * gradient));
|
|
//real intercept
|
|
}
|
|
void set_limits( //set min,max
|
|
float new_min, //bottom and
|
|
float new_max) { //top of row
|
|
y_min = new_min;
|
|
y_max = new_max;
|
|
}
|
|
void compute_vertical_projection();
|
|
//get projection
|
|
|
|
bool rep_chars_marked() const {
|
|
return num_repeated_sets_ != -1;
|
|
}
|
|
void clear_rep_chars_marked() {
|
|
num_repeated_sets_ = -1;
|
|
}
|
|
int num_repeated_sets() const {
|
|
return num_repeated_sets_;
|
|
}
|
|
void set_num_repeated_sets(int num_sets) {
|
|
num_repeated_sets_ = num_sets;
|
|
}
|
|
|
|
// true when dead
|
|
BOOL8 merged;
|
|
BOOL8 all_caps; // had no ascenders
|
|
BOOL8 used_dm_model; // in guessing pitch
|
|
int16_t projection_left; // start of projection
|
|
int16_t projection_right; // start of projection
|
|
PITCH_TYPE pitch_decision; // how strong is decision
|
|
float fixed_pitch; // pitch or 0
|
|
float fp_space; // sp if fixed pitch
|
|
float fp_nonsp; // nonsp if fixed pitch
|
|
float pr_space; // sp if prop
|
|
float pr_nonsp; // non sp if prop
|
|
float spacing; // to "next" row
|
|
float xheight; // of line
|
|
int xheight_evidence; // number of blobs of height xheight
|
|
float ascrise; // ascenders
|
|
float descdrop; // descenders
|
|
float body_size; // of CJK characters. Assumed to be
|
|
// xheight+ascrise for non-CJK text.
|
|
int32_t min_space; // min size for real space
|
|
int32_t max_nonspace; // max size of non-space
|
|
int32_t space_threshold; // space vs nonspace
|
|
float kern_size; // average non-space
|
|
float space_size; // average space
|
|
WERD_LIST rep_words; // repeated chars
|
|
ICOORDELT_LIST char_cells; // fixed pitch cells
|
|
QSPLINE baseline; // curved baseline
|
|
STATS projection; // vertical projection
|
|
|
|
private:
|
|
void clear(); // clear all values to reasonable defaults
|
|
|
|
BLOBNBOX_LIST blobs; //blobs in row
|
|
float y_min; //coords
|
|
float y_max;
|
|
float initial_y_min;
|
|
float m, c; //line spec
|
|
float error; //line error
|
|
float para_c; //constrained fit
|
|
float para_error;
|
|
float y_origin; //rotated para_c;
|
|
float credibility; //baseline believability
|
|
int num_repeated_sets_; // number of sets of repeated blobs
|
|
// set to -1 if we have not searched
|
|
// for repeated blobs in this row yet
|
|
};
|
|
|
|
ELIST2IZEH (TO_ROW)
|
|
class TO_BLOCK:public ELIST_LINK
|
|
{
|
|
public:
|
|
TO_BLOCK() : pitch_decision(PITCH_DUNNO) {
|
|
clear();
|
|
} //empty
|
|
TO_BLOCK( //constructor
|
|
BLOCK *src_block); //real block
|
|
~TO_BLOCK();
|
|
|
|
void clear(); // clear all scalar members.
|
|
|
|
TO_ROW_LIST *get_rows() { //access function
|
|
return &row_list;
|
|
}
|
|
|
|
// Rotate all the blobnbox lists and the underlying block. Then update the
|
|
// median size statistic from the blobs list.
|
|
void rotate(const FCOORD& rotation) {
|
|
BLOBNBOX_LIST* blobnbox_list[] = {&blobs, &underlines, &noise_blobs,
|
|
&small_blobs, &large_blobs, nullptr};
|
|
for (BLOBNBOX_LIST** list = blobnbox_list; *list != nullptr; ++list) {
|
|
BLOBNBOX_IT it(*list);
|
|
for (it.mark_cycle_pt(); !it.cycled_list(); it.forward()) {
|
|
it.data()->rotate(rotation);
|
|
}
|
|
}
|
|
// Rotate the block
|
|
ASSERT_HOST(block->pdblk.poly_block() != nullptr);
|
|
block->rotate(rotation);
|
|
// Update the median size statistic from the blobs list.
|
|
STATS widths(0, block->pdblk.bounding_box().width());
|
|
STATS heights(0, block->pdblk.bounding_box().height());
|
|
BLOBNBOX_IT blob_it(&blobs);
|
|
for (blob_it.mark_cycle_pt(); !blob_it.cycled_list(); blob_it.forward()) {
|
|
widths.add(blob_it.data()->bounding_box().width(), 1);
|
|
heights.add(blob_it.data()->bounding_box().height(), 1);
|
|
}
|
|
block->set_median_size(static_cast<int>(widths.median() + 0.5),
|
|
static_cast<int>(heights.median() + 0.5));
|
|
}
|
|
|
|
void print_rows() { //debug info
|
|
TO_ROW_IT row_it = &row_list;
|
|
TO_ROW *row;
|
|
|
|
for (row_it.mark_cycle_pt(); !row_it.cycled_list();
|
|
row_it.forward()) {
|
|
row = row_it.data();
|
|
tprintf("Row range (%g,%g), para_c=%g, blobcount=%" PRId32 "\n",
|
|
row->min_y(), row->max_y(), row->parallel_c(),
|
|
row->blob_list()->length());
|
|
}
|
|
}
|
|
|
|
// Reorganizes the blob lists with a different definition of small, medium
|
|
// and large, compared to the original definition.
|
|
// Height is still the primary filter key, but medium width blobs of small
|
|
// height become medium, and very wide blobs of small height stay small.
|
|
void ReSetAndReFilterBlobs();
|
|
|
|
// Deletes noise blobs from all lists where not owned by a ColPartition.
|
|
void DeleteUnownedNoise();
|
|
|
|
// Computes and stores the edge offsets on each blob for use in feature
|
|
// extraction, using greyscale if the supplied grey and thresholds pixes
|
|
// are 8-bit or otherwise (if nullptr or not 8 bit) the original binary
|
|
// edge step outlines.
|
|
// Thresholds must either be the same size as grey or an integer down-scale
|
|
// of grey.
|
|
// See coutln.h for an explanation of edge offsets.
|
|
void ComputeEdgeOffsets(Pix* thresholds, Pix* grey);
|
|
|
|
#ifndef GRAPHICS_DISABLED
|
|
// Draw the noise blobs from all lists in red.
|
|
void plot_noise_blobs(ScrollView* to_win);
|
|
// Draw the blobs on on the various lists in the block in different colors.
|
|
void plot_graded_blobs(ScrollView* to_win);
|
|
#endif
|
|
|
|
BLOBNBOX_LIST blobs; //medium size
|
|
BLOBNBOX_LIST underlines; //underline blobs
|
|
BLOBNBOX_LIST noise_blobs; //very small
|
|
BLOBNBOX_LIST small_blobs; //fairly small
|
|
BLOBNBOX_LIST large_blobs; //big blobs
|
|
BLOCK *block; //real block
|
|
PITCH_TYPE pitch_decision; //how strong is decision
|
|
float line_spacing; //estimate
|
|
// line_size is a lower-bound estimate of the font size in pixels of
|
|
// the text in the block (with ascenders and descenders), being a small
|
|
// (1.25) multiple of the median height of filtered blobs.
|
|
// In most cases the font size will be bigger, but it will be closer
|
|
// if the text is allcaps, or in a no-x-height script.
|
|
float line_size; //estimate
|
|
float max_blob_size; //line assignment limit
|
|
float baseline_offset; //phase shift
|
|
float xheight; //median blob size
|
|
float fixed_pitch; //pitch or 0
|
|
float kern_size; //average non-space
|
|
float space_size; //average space
|
|
int32_t min_space; //min definite space
|
|
int32_t max_nonspace; //max definite
|
|
float fp_space; //sp if fixed pitch
|
|
float fp_nonsp; //nonsp if fixed pitch
|
|
float pr_space; //sp if prop
|
|
float pr_nonsp; //non sp if prop
|
|
TO_ROW *key_row; //starting row
|
|
|
|
private:
|
|
TO_ROW_LIST row_list; //temporary rows
|
|
};
|
|
|
|
ELISTIZEH (TO_BLOCK)
|
|
extern double_VAR_H (textord_error_weight, 3,
|
|
"Weighting for error in believability");
|
|
void find_cblob_limits( //get y limits
|
|
C_BLOB *blob, //blob to search
|
|
float leftx, //x limits
|
|
float rightx,
|
|
FCOORD rotation, //for landscape
|
|
float &ymin, //output y limits
|
|
float &ymax);
|
|
void find_cblob_vlimits( //get y limits
|
|
C_BLOB *blob, //blob to search
|
|
float leftx, //x limits
|
|
float rightx,
|
|
float &ymin, //output y limits
|
|
float &ymax);
|
|
void find_cblob_hlimits( //get x limits
|
|
C_BLOB *blob, //blob to search
|
|
float bottomy, //y limits
|
|
float topy,
|
|
float &xmin, //output x limits
|
|
float &xymax);
|
|
C_BLOB *crotate_cblob( //rotate it
|
|
C_BLOB *blob, //blob to search
|
|
FCOORD rotation //for landscape
|
|
);
|
|
TBOX box_next( //get bounding box
|
|
BLOBNBOX_IT *it //iterator to blobds
|
|
);
|
|
TBOX box_next_pre_chopped( //get bounding box
|
|
BLOBNBOX_IT *it //iterator to blobds
|
|
);
|
|
void vertical_cblob_projection( //project outlines
|
|
C_BLOB *blob, //blob to project
|
|
STATS *stats //output
|
|
);
|
|
void vertical_coutline_projection( //project outlines
|
|
C_OUTLINE *outline, //outline to project
|
|
STATS *stats //output
|
|
);
|
|
#ifndef GRAPHICS_DISABLED
|
|
void plot_blob_list(ScrollView* win, // window to draw in
|
|
BLOBNBOX_LIST *list, // blob list
|
|
ScrollView::Color body_colour, // colour to draw
|
|
ScrollView::Color child_colour); // colour of child
|
|
#endif // GRAPHICS_DISABLED
|
|
#endif
|