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0e868ef377
Tha, Vie, Kan, Tel etc. There is a new overlap detector that detects when diacritics cause a big increase in textline overlap. In such cases, diacritics from overlap regions are kept separate from layout analysis completely, allowing textline formation to happen without them. The diacritics are then assigned to 0, 1 or 2 close words at the end of layout analysis, using and modifying an old noise detection data path. The stored diacritics are used or not during recognition according to the character classifier's liking for them.
200 lines
7.5 KiB
C++
200 lines
7.5 KiB
C++
/**********************************************************************
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* File: word.c
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* Description: Code for the WERD class.
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* Author: Ray Smith
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* Created: Tue Oct 08 14:32:12 BST 1991
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*
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* (C) Copyright 1991, 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 WERD_H
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#define WERD_H
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#include "params.h"
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#include "bits16.h"
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#include "elst2.h"
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#include "strngs.h"
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#include "blckerr.h"
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#include "stepblob.h"
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enum WERD_FLAGS
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{
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W_SEGMENTED, //< correctly segmented
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W_ITALIC, //< italic text
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W_BOLD, //< bold text
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W_BOL, //< start of line
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W_EOL, //< end of line
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W_NORMALIZED, //< flags
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W_SCRIPT_HAS_XHEIGHT, //< x-height concept makes sense.
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W_SCRIPT_IS_LATIN, //< Special case latin for y. splitting.
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W_DONT_CHOP, //< fixed pitch chopped
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W_REP_CHAR, //< repeated character
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W_FUZZY_SP, //< fuzzy space
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W_FUZZY_NON, //< fuzzy nonspace
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W_INVERSE //< white on black
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};
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enum DISPLAY_FLAGS
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{
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/* Display flags bit number allocations */
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DF_BOX, //< Bounding box
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DF_TEXT, //< Correct ascii
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DF_POLYGONAL, //< Polyg approx
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DF_EDGE_STEP, //< Edge steps
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DF_BN_POLYGONAL, //< BL normalisd polyapx
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DF_BLAMER //< Blamer information
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};
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class ROW; //forward decl
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class WERD : public ELIST2_LINK {
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public:
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WERD() {}
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// WERD constructed with:
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// blob_list - blobs of the word (we take this list's contents)
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// blanks - number of blanks before the word
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// text - correct text (outlives WERD)
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WERD(C_BLOB_LIST *blob_list, uinT8 blanks, const char *text);
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// WERD constructed from:
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// blob_list - blobs in the word
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// clone - werd to clone flags, etc from.
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WERD(C_BLOB_LIST *blob_list, WERD *clone);
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// Construct a WERD from a single_blob and clone the flags from this.
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// W_BOL and W_EOL flags are set according to the given values.
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WERD* ConstructFromSingleBlob(bool bol, bool eol, C_BLOB* blob);
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~WERD() {
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}
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// assignment
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WERD & operator= (const WERD &source);
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// This method returns a new werd constructed using the blobs in the input
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// all_blobs list, which correspond to the blobs in this werd object. The
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// blobs used to construct the new word are consumed and removed from the
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// input all_blobs list.
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// Returns NULL if the word couldn't be constructed.
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// Returns original blobs for which no matches were found in the output list
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// orphan_blobs (appends).
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WERD *ConstructWerdWithNewBlobs(C_BLOB_LIST *all_blobs,
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C_BLOB_LIST *orphan_blobs);
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// Accessors for reject / DUFF blobs in various formats
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C_BLOB_LIST *rej_cblob_list() { // compact format
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return &rej_cblobs;
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}
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// Accessors for good blobs in various formats.
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C_BLOB_LIST *cblob_list() { // get compact blobs
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return &cblobs;
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}
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uinT8 space() { // access function
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return blanks;
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}
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void set_blanks(uinT8 new_blanks) {
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blanks = new_blanks;
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}
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int script_id() const {
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return script_id_;
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}
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void set_script_id(int id) {
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script_id_ = id;
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}
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// Returns the (default) bounding box including all the dots.
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TBOX bounding_box() const; // compute bounding box
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// Returns the bounding box including the desired combination of upper and
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// lower noise/diacritic elements.
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TBOX restricted_bounding_box(bool upper_dots, bool lower_dots) const;
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// Returns the bounding box of only the good blobs.
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TBOX true_bounding_box() const;
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const char *text() const { return correct.string(); }
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void set_text(const char *new_text) { correct = new_text; }
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BOOL8 flag(WERD_FLAGS mask) const { return flags.bit(mask); }
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void set_flag(WERD_FLAGS mask, BOOL8 value) { flags.set_bit(mask, value); }
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BOOL8 display_flag(uinT8 flag) const { return disp_flags.bit(flag); }
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void set_display_flag(uinT8 flag, BOOL8 value) {
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disp_flags.set_bit(flag, value);
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}
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WERD *shallow_copy(); // shallow copy word
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// reposition word by vector
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void move(const ICOORD vec);
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// join other's blobs onto this werd, emptying out other.
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void join_on(WERD* other);
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// copy other's blobs onto this word, leaving other intact.
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void copy_on(WERD* other);
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// tprintf word metadata (but not blob innards)
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void print();
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#ifndef GRAPHICS_DISABLED
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// plot word on window in a uniform colour
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void plot(ScrollView *window, ScrollView::Color colour);
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// Get the next color in the (looping) rainbow.
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static ScrollView::Color NextColor(ScrollView::Color colour);
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// plot word on window in a rainbow of colours
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void plot(ScrollView *window);
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// plot rejected blobs in a rainbow of colours
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void plot_rej_blobs(ScrollView *window);
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#endif // GRAPHICS_DISABLED
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// Removes noise from the word by moving small outlines to the rej_cblobs
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// list, based on the size_threshold.
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void CleanNoise(float size_threshold);
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// Extracts all the noise outlines and stuffs the pointers into the given
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// vector of outlines. Afterwards, the outlines vector owns the pointers.
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void GetNoiseOutlines(GenericVector<C_OUTLINE *> *outlines);
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// Adds the selected outlines to the indcated real blobs, and puts the rest
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// back in rej_cblobs where they came from. Where the target_blobs entry is
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// NULL, a run of wanted outlines is put into a single new blob.
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// Ownership of the outlines is transferred back to the word. (Hence
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// GenericVector and not PointerVector.)
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// Returns true if any new blob was added to the start of the word, which
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// suggests that it might need joining to the word before it, and likewise
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// sets make_next_word_fuzzy true if any new blob was added to the end.
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bool AddSelectedOutlines(const GenericVector<bool> &wanted,
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const GenericVector<C_BLOB *> &target_blobs,
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const GenericVector<C_OUTLINE *> &outlines,
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bool *make_next_word_fuzzy);
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private:
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uinT8 blanks; // no of blanks
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uinT8 dummy; // padding
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BITS16 flags; // flags about word
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BITS16 disp_flags; // display flags
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inT16 script_id_; // From unicharset.
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STRING correct; // correct text
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C_BLOB_LIST cblobs; // compacted blobs
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C_BLOB_LIST rej_cblobs; // DUFF blobs
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};
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ELIST2IZEH (WERD)
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#include "ocrrow.h" // placed here due to
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// compare words by increasing order of left edge, suitable for qsort(3)
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int word_comparator(const void *word1p, const void *word2p);
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#endif
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