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644 lines
22 KiB
C++
644 lines
22 KiB
C++
/**********************************************************************
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* File: ratngs.h (Formerly ratings.h)
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* Description: Definition of the WERD_CHOICE and BLOB_CHOICE classes.
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* Author: Ray Smith
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* Created: Thu Apr 23 11:40:38 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 RATNGS_H
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#define RATNGS_H
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#include <assert.h>
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#include "clst.h"
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#include "elst.h"
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#include "fontinfo.h"
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#include "genericvector.h"
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#include "matrix.h"
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#include "unichar.h"
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#include "unicharset.h"
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#include "werd.h"
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class MATRIX;
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struct TBLOB;
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struct TWERD;
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// Enum to describe the source of a BLOB_CHOICE to make it possible to determine
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// whether a blob has been classified by inspecting the BLOB_CHOICEs.
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enum BlobChoiceClassifier {
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BCC_STATIC_CLASSIFIER, // From the char_norm classifier.
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BCC_ADAPTED_CLASSIFIER, // From the adaptive classifier.
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BCC_SPECKLE_CLASSIFIER, // Backup for failed classification.
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BCC_AMBIG, // Generated by ambiguity detection.
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BCC_FAKE, // From some other process.
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};
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class BLOB_CHOICE: public ELIST_LINK
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{
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public:
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BLOB_CHOICE() {
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unichar_id_ = UNICHAR_SPACE;
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fontinfo_id_ = -1;
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fontinfo_id2_ = -1;
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rating_ = 10.0;
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certainty_ = -1.0;
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script_id_ = -1;
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xgap_before_ = 0;
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xgap_after_ = 0;
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min_xheight_ = 0.0f;
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max_xheight_ = 0.0f;
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yshift_ = 0.0f;
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classifier_ = BCC_FAKE;
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}
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BLOB_CHOICE(UNICHAR_ID src_unichar_id, // character id
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float src_rating, // rating
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float src_cert, // certainty
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int script_id, // script
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float min_xheight, // min xheight in image pixel units
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float max_xheight, // max xheight allowed by this char
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float yshift, // the larger of y shift (top or bottom)
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BlobChoiceClassifier c); // adapted match or other
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BLOB_CHOICE(const BLOB_CHOICE &other);
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~BLOB_CHOICE() {}
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UNICHAR_ID unichar_id() const {
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return unichar_id_;
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}
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float rating() const {
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return rating_;
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}
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float certainty() const {
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return certainty_;
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}
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inT16 fontinfo_id() const {
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return fontinfo_id_;
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}
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inT16 fontinfo_id2() const {
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return fontinfo_id2_;
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}
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const GenericVector<tesseract::ScoredFont>& fonts() const {
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return fonts_;
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}
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void set_fonts(const GenericVector<tesseract::ScoredFont>& fonts) {
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fonts_ = fonts;
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int score1 = 0, score2 = 0;
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fontinfo_id_ = -1;
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fontinfo_id2_ = -1;
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for (int f = 0; f < fonts_.size(); ++f) {
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if (fonts_[f].score > score1) {
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score2 = score1;
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fontinfo_id2_ = fontinfo_id_;
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score1 = fonts_[f].score;
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fontinfo_id_ = fonts_[f].fontinfo_id;
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} else if (fonts_[f].score > score2) {
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score2 = fonts_[f].score;
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fontinfo_id2_ = fonts_[f].fontinfo_id;
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}
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}
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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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const MATRIX_COORD& matrix_cell() {
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return matrix_cell_;
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}
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inT16 xgap_before() const {
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return xgap_before_;
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}
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inT16 xgap_after() const {
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return xgap_after_;
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}
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float min_xheight() const {
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return min_xheight_;
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}
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float max_xheight() const {
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return max_xheight_;
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}
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float yshift() const {
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return yshift_;
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}
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BlobChoiceClassifier classifier() const {
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return classifier_;
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}
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bool IsAdapted() const {
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return classifier_ == BCC_ADAPTED_CLASSIFIER;
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}
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bool IsClassified() const {
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return classifier_ == BCC_STATIC_CLASSIFIER ||
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classifier_ == BCC_ADAPTED_CLASSIFIER ||
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classifier_ == BCC_SPECKLE_CLASSIFIER;
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}
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void set_unichar_id(UNICHAR_ID newunichar_id) {
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unichar_id_ = newunichar_id;
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}
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void set_rating(float newrat) {
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rating_ = newrat;
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}
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void set_certainty(float newrat) {
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certainty_ = newrat;
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}
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void set_script(int newscript_id) {
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script_id_ = newscript_id;
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}
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void set_matrix_cell(int col, int row) {
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matrix_cell_.col = col;
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matrix_cell_.row = row;
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}
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void set_xgap_before(inT16 gap) {
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xgap_before_ = gap;
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}
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void set_xgap_after(inT16 gap) {
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xgap_after_ = gap;
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}
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void set_classifier(BlobChoiceClassifier classifier) {
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classifier_ = classifier;
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}
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static BLOB_CHOICE* deep_copy(const BLOB_CHOICE* src) {
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BLOB_CHOICE* choice = new BLOB_CHOICE;
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*choice = *src;
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return choice;
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}
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// Returns true if *this and other agree on the baseline and x-height
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// to within some tolerance based on a given estimate of the x-height.
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bool PosAndSizeAgree(const BLOB_CHOICE& other, float x_height,
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bool debug) const;
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void print(const UNICHARSET *unicharset) const {
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tprintf("r%.2f c%.2f x[%g,%g]: %d %s",
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rating_, certainty_,
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min_xheight_, max_xheight_, unichar_id_,
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(unicharset == NULL) ? "" :
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unicharset->debug_str(unichar_id_).string());
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}
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void print_full() const {
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print(NULL);
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tprintf(" script=%d, font1=%d, font2=%d, yshift=%g, classifier=%d\n",
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script_id_, fontinfo_id_, fontinfo_id2_, yshift_, classifier_);
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}
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// Sort function for sorting BLOB_CHOICEs in increasing order of rating.
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static int SortByRating(const void *p1, const void *p2) {
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const BLOB_CHOICE *bc1 =
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*reinterpret_cast<const BLOB_CHOICE * const *>(p1);
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const BLOB_CHOICE *bc2 =
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*reinterpret_cast<const BLOB_CHOICE * const *>(p2);
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return (bc1->rating_ < bc2->rating_) ? -1 : 1;
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}
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private:
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UNICHAR_ID unichar_id_; // unichar id
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// Fonts and scores. Allowed to be empty.
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GenericVector<tesseract::ScoredFont> fonts_;
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inT16 fontinfo_id_; // char font information
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inT16 fontinfo_id2_; // 2nd choice font information
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// Rating is the classifier distance weighted by the length of the outline
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// in the blob. In terms of probability, classifier distance is -klog p such
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// that the resulting distance is in the range [0, 1] and then
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// rating = w (-k log p) where w is the weight for the length of the outline.
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// Sums of ratings may be compared meaningfully for words of different
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// segmentation.
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float rating_; // size related
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// Certainty is a number in [-20, 0] indicating the classifier certainty
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// of the choice. In terms of probability, certainty = 20 (k log p) where
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// k is defined as above to normalize -klog p to the range [0, 1].
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float certainty_; // absolute
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int script_id_;
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// Holds the position of this choice in the ratings matrix.
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// Used to location position in the matrix during path backtracking.
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MATRIX_COORD matrix_cell_;
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inT16 xgap_before_;
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inT16 xgap_after_;
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// X-height range (in image pixels) that this classification supports.
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float min_xheight_;
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float max_xheight_;
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// yshift_ - The vertical distance (in image pixels) the character is
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// shifted (up or down) from an acceptable y position.
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float yshift_;
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BlobChoiceClassifier classifier_; // What generated *this.
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};
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// Make BLOB_CHOICE listable.
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ELISTIZEH(BLOB_CHOICE)
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// Return the BLOB_CHOICE in bc_list matching a given unichar_id,
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// or NULL if there is no match.
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BLOB_CHOICE *FindMatchingChoice(UNICHAR_ID char_id, BLOB_CHOICE_LIST *bc_list);
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// Permuter codes used in WERD_CHOICEs.
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enum PermuterType {
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NO_PERM, // 0
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PUNC_PERM, // 1
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TOP_CHOICE_PERM, // 2
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LOWER_CASE_PERM, // 3
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UPPER_CASE_PERM, // 4
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NGRAM_PERM, // 5
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NUMBER_PERM, // 6
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USER_PATTERN_PERM, // 7
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SYSTEM_DAWG_PERM, // 8
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DOC_DAWG_PERM, // 9
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USER_DAWG_PERM, // 10
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FREQ_DAWG_PERM, // 11
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COMPOUND_PERM, // 12
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NUM_PERMUTER_TYPES
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};
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namespace tesseract {
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// ScriptPos tells whether a character is subscript, superscript or normal.
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enum ScriptPos {
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SP_NORMAL,
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SP_SUBSCRIPT,
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SP_SUPERSCRIPT,
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SP_DROPCAP
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};
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const char *ScriptPosToString(tesseract::ScriptPos script_pos);
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} // namespace tesseract.
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class WERD_CHOICE : public ELIST_LINK {
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public:
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static const float kBadRating;
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static const char *permuter_name(uinT8 permuter);
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WERD_CHOICE(const UNICHARSET *unicharset)
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: unicharset_(unicharset) { this->init(8); }
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WERD_CHOICE(const UNICHARSET *unicharset, int reserved)
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: unicharset_(unicharset) { this->init(reserved); }
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WERD_CHOICE(const char *src_string,
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const char *src_lengths,
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float src_rating,
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float src_certainty,
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uinT8 src_permuter,
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const UNICHARSET &unicharset)
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: unicharset_(&unicharset) {
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this->init(src_string, src_lengths, src_rating,
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src_certainty, src_permuter);
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}
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WERD_CHOICE(const char *src_string, const UNICHARSET &unicharset);
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WERD_CHOICE(const WERD_CHOICE &word)
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: ELIST_LINK(word), unicharset_(word.unicharset_) {
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this->init(word.length());
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this->operator=(word);
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}
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~WERD_CHOICE();
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const UNICHARSET *unicharset() const {
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return unicharset_;
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}
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inline int length() const {
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return length_;
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}
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float adjust_factor() const {
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return adjust_factor_;
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}
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void set_adjust_factor(float factor) {
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adjust_factor_ = factor;
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}
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inline const UNICHAR_ID *unichar_ids() const {
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return unichar_ids_;
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}
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inline UNICHAR_ID unichar_id(int index) const {
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assert(index < length_);
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return unichar_ids_[index];
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}
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inline int state(int index) const {
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return state_[index];
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}
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tesseract::ScriptPos BlobPosition(int index) const {
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if (index < 0 || index >= length_)
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return tesseract::SP_NORMAL;
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return script_pos_[index];
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}
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inline float rating() const {
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return rating_;
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}
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inline float certainty() const {
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return certainty_;
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}
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inline float certainty(int index) const {
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return certainties_[index];
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}
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inline float min_x_height() const {
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return min_x_height_;
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}
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inline float max_x_height() const {
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return max_x_height_;
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}
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inline void set_x_heights(float min_height, float max_height) {
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min_x_height_ = min_height;
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max_x_height_ = max_height;
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}
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inline uinT8 permuter() const {
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return permuter_;
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}
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const char *permuter_name() const;
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// Returns the BLOB_CHOICE_LIST corresponding to the given index in the word,
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// taken from the appropriate cell in the ratings MATRIX.
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// Borrowed pointer, so do not delete.
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BLOB_CHOICE_LIST* blob_choices(int index, MATRIX* ratings) const;
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// Returns the MATRIX_COORD corresponding to the location in the ratings
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// MATRIX for the given index into the word.
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MATRIX_COORD MatrixCoord(int index) const;
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inline void set_unichar_id(UNICHAR_ID unichar_id, int index) {
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assert(index < length_);
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unichar_ids_[index] = unichar_id;
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}
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bool dangerous_ambig_found() const {
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return dangerous_ambig_found_;
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}
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void set_dangerous_ambig_found_(bool value) {
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dangerous_ambig_found_ = value;
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}
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inline void set_rating(float new_val) {
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rating_ = new_val;
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}
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inline void set_certainty(float new_val) {
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certainty_ = new_val;
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}
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inline void set_permuter(uinT8 perm) {
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permuter_ = perm;
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}
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// Note: this function should only be used if all the fields
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// are populated manually with set_* functions (rather than
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// (copy)constructors and append_* functions).
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inline void set_length(int len) {
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ASSERT_HOST(reserved_ >= len);
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length_ = len;
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}
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/// Make more space in unichar_id_ and fragment_lengths_ arrays.
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inline void double_the_size() {
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if (reserved_ > 0) {
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unichar_ids_ = GenericVector<UNICHAR_ID>::double_the_size_memcpy(
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reserved_, unichar_ids_);
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script_pos_ = GenericVector<tesseract::ScriptPos>::double_the_size_memcpy(
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reserved_, script_pos_);
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state_ = GenericVector<int>::double_the_size_memcpy(
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reserved_, state_);
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certainties_ = GenericVector<float>::double_the_size_memcpy(
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reserved_, certainties_);
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reserved_ *= 2;
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} else {
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unichar_ids_ = new UNICHAR_ID[1];
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script_pos_ = new tesseract::ScriptPos[1];
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state_ = new int[1];
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certainties_ = new float[1];
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reserved_ = 1;
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}
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}
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/// Initializes WERD_CHOICE - reserves length slots in unichar_ids_ and
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/// fragment_length_ arrays. Sets other values to default (blank) values.
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inline void init(int reserved) {
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reserved_ = reserved;
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if (reserved > 0) {
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unichar_ids_ = new UNICHAR_ID[reserved];
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script_pos_ = new tesseract::ScriptPos[reserved];
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state_ = new int[reserved];
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certainties_ = new float[reserved];
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} else {
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unichar_ids_ = NULL;
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script_pos_ = NULL;
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state_ = NULL;
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certainties_ = NULL;
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}
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length_ = 0;
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adjust_factor_ = 1.0f;
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rating_ = 0.0;
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certainty_ = MAX_FLOAT32;
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min_x_height_ = 0.0f;
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max_x_height_ = MAX_FLOAT32;
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permuter_ = NO_PERM;
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unichars_in_script_order_ = false; // Tesseract is strict left-to-right.
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dangerous_ambig_found_ = false;
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}
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/// Helper function to build a WERD_CHOICE from the given string,
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/// fragment lengths, rating, certainty and permuter.
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/// The function assumes that src_string is not NULL.
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/// src_lengths argument could be NULL, in which case the unichars
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/// in src_string are assumed to all be of length 1.
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void init(const char *src_string, const char *src_lengths,
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float src_rating, float src_certainty,
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uinT8 src_permuter);
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/// Set the fields in this choice to be default (bad) values.
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inline void make_bad() {
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length_ = 0;
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rating_ = kBadRating;
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certainty_ = -MAX_FLOAT32;
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}
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/// This function assumes that there is enough space reserved
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/// in the WERD_CHOICE for adding another unichar.
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/// This is an efficient alternative to append_unichar_id().
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inline void append_unichar_id_space_allocated(
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UNICHAR_ID unichar_id, int blob_count,
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float rating, float certainty) {
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assert(reserved_ > length_);
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length_++;
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this->set_unichar_id(unichar_id, blob_count,
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rating, certainty, length_-1);
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}
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void append_unichar_id(UNICHAR_ID unichar_id, int blob_count,
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float rating, float certainty);
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inline void set_unichar_id(UNICHAR_ID unichar_id, int blob_count,
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float rating, float certainty, int index) {
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assert(index < length_);
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unichar_ids_[index] = unichar_id;
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state_[index] = blob_count;
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certainties_[index] = certainty;
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script_pos_[index] = tesseract::SP_NORMAL;
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rating_ += rating;
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if (certainty < certainty_) {
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certainty_ = certainty;
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}
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}
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// Sets the entries for the given index from the BLOB_CHOICE, assuming
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// unit fragment lengths, but setting the state for this index to blob_count.
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void set_blob_choice(int index, int blob_count,
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const BLOB_CHOICE* blob_choice);
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bool contains_unichar_id(UNICHAR_ID unichar_id) const;
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void remove_unichar_ids(int index, int num);
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inline void remove_last_unichar_id() { --length_; }
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inline void remove_unichar_id(int index) {
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this->remove_unichar_ids(index, 1);
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}
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bool has_rtl_unichar_id() const;
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void reverse_and_mirror_unichar_ids();
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|
|
|
// Returns the half-open interval of unichar_id indices [start, end) which
|
|
// enclose the core portion of this word -- the part after stripping
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|
// punctuation from the left and right.
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void punct_stripped(int *start_core, int *end_core) const;
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|
|
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// Returns the indices [start, end) containing the core of the word, stripped
|
|
// of any superscript digits on either side. (i.e., the non-footnote part
|
|
// of the word). There is no guarantee that the output range is non-empty.
|
|
void GetNonSuperscriptSpan(int *start, int *end) const;
|
|
|
|
// Return a copy of this WERD_CHOICE with the choices [start, end).
|
|
// The result is useful only for checking against a dictionary.
|
|
WERD_CHOICE shallow_copy(int start, int end) const;
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|
|
|
void string_and_lengths(STRING *word_str, STRING *word_lengths_str) const;
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|
const STRING debug_string() const {
|
|
STRING word_str;
|
|
for (int i = 0; i < length_; ++i) {
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word_str += unicharset_->debug_str(unichar_ids_[i]);
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|
word_str += " ";
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|
}
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|
return word_str;
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|
}
|
|
|
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// Call this to override the default (strict left to right graphemes)
|
|
// with the fact that some engine produces a "reading order" set of
|
|
// Graphemes for each word.
|
|
bool set_unichars_in_script_order(bool in_script_order) {
|
|
return unichars_in_script_order_ = in_script_order;
|
|
}
|
|
|
|
bool unichars_in_script_order() const {
|
|
return unichars_in_script_order_;
|
|
}
|
|
|
|
// Returns a UTF-8 string equivalent to the current choice
|
|
// of UNICHAR IDs.
|
|
const STRING &unichar_string() const {
|
|
this->string_and_lengths(&unichar_string_, &unichar_lengths_);
|
|
return unichar_string_;
|
|
}
|
|
|
|
// Returns the lengths, one byte each, representing the number of bytes
|
|
// required in the unichar_string for each UNICHAR_ID.
|
|
const STRING &unichar_lengths() const {
|
|
this->string_and_lengths(&unichar_string_, &unichar_lengths_);
|
|
return unichar_lengths_;
|
|
}
|
|
|
|
// Sets up the script_pos_ member using the blobs_list to get the bln
|
|
// bounding boxes, *this to get the unichars, and this->unicharset
|
|
// to get the target positions. If small_caps is true, sub/super are not
|
|
// considered, but dropcaps are.
|
|
// NOTE: blobs_list should be the chopped_word blobs. (Fully segemented.)
|
|
void SetScriptPositions(bool small_caps, TWERD* word);
|
|
// Sets the script_pos_ member from some source positions with a given length.
|
|
void SetScriptPositions(const tesseract::ScriptPos* positions, int length);
|
|
// Sets all the script_pos_ positions to the given position.
|
|
void SetAllScriptPositions(tesseract::ScriptPos position);
|
|
|
|
static tesseract::ScriptPos ScriptPositionOf(bool print_debug,
|
|
const UNICHARSET& unicharset,
|
|
const TBOX& blob_box,
|
|
UNICHAR_ID unichar_id);
|
|
|
|
// Returns the "dominant" script ID for the word. By "dominant", the script
|
|
// must account for at least half the characters. Otherwise, it returns 0.
|
|
// Note that for Japanese, Hiragana and Katakana are simply treated as Han.
|
|
int GetTopScriptID() const;
|
|
|
|
// Fixes the state_ for a chop at the given blob_posiiton.
|
|
void UpdateStateForSplit(int blob_position);
|
|
|
|
// Returns the sum of all the state elements, being the total number of blobs.
|
|
int TotalOfStates() const;
|
|
|
|
void print() const { this->print(""); }
|
|
void print(const char *msg) const;
|
|
// Prints the segmentation state with an introductory message.
|
|
void print_state(const char *msg) const;
|
|
|
|
// Displays the segmentation state of *this (if not the same as the last
|
|
// one displayed) and waits for a click in the window.
|
|
void DisplaySegmentation(TWERD* word);
|
|
|
|
WERD_CHOICE& operator+= ( // concatanate
|
|
const WERD_CHOICE & second);// second on first
|
|
|
|
WERD_CHOICE& operator= (const WERD_CHOICE& source);
|
|
|
|
private:
|
|
const UNICHARSET *unicharset_;
|
|
// TODO(rays) Perhaps replace the multiple arrays with an array of structs?
|
|
// unichar_ids_ is an array of classifier "results" that make up a word.
|
|
// For each unichar_ids_[i], script_pos_[i] has the sub/super/normal position
|
|
// of each unichar_id.
|
|
// state_[i] indicates the number of blobs in WERD_RES::chopped_word that
|
|
// were put together to make the classification results in the ith position
|
|
// in unichar_ids_, and certainties_[i] is the certainty of the choice that
|
|
// was used in this word.
|
|
// == Change from before ==
|
|
// Previously there was fragment_lengths_ that allowed a word to be
|
|
// artificially composed of multiple fragment results. Since the new
|
|
// segmentation search doesn't do fragments, treatment of fragments has
|
|
// been moved to a lower level, augmenting the ratings matrix with the
|
|
// combined fragments, and allowing the language-model/segmentation-search
|
|
// to deal with only the combined unichar_ids.
|
|
UNICHAR_ID *unichar_ids_; // unichar ids that represent the text of the word
|
|
tesseract::ScriptPos* script_pos_; // Normal/Sub/Superscript of each unichar.
|
|
int* state_; // Number of blobs in each unichar.
|
|
float* certainties_; // Certainty of each unichar.
|
|
int reserved_; // size of the above arrays
|
|
int length_; // word length
|
|
// Factor that was used to adjust the rating.
|
|
float adjust_factor_;
|
|
// Rating is the sum of the ratings of the individual blobs in the word.
|
|
float rating_; // size related
|
|
// certainty is the min (worst) certainty of the individual blobs in the word.
|
|
float certainty_; // absolute
|
|
// xheight computed from the result, or 0 if inconsistent.
|
|
float min_x_height_;
|
|
float max_x_height_;
|
|
uinT8 permuter_; // permuter code
|
|
|
|
// Normally, the ratings_ matrix represents the recognition results in order
|
|
// from left-to-right. However, some engines (say Cube) may return
|
|
// recognition results in the order of the script's major reading direction
|
|
// (for Arabic, that is right-to-left).
|
|
bool unichars_in_script_order_;
|
|
// True if NoDangerousAmbig found an ambiguity.
|
|
bool dangerous_ambig_found_;
|
|
|
|
// The following variables are populated and passed by reference any
|
|
// time unichar_string() or unichar_lengths() are called.
|
|
mutable STRING unichar_string_;
|
|
mutable STRING unichar_lengths_;
|
|
};
|
|
|
|
// Make WERD_CHOICE listable.
|
|
ELISTIZEH(WERD_CHOICE)
|
|
typedef GenericVector<BLOB_CHOICE_LIST *> BLOB_CHOICE_LIST_VECTOR;
|
|
|
|
// Utilities for comparing WERD_CHOICEs
|
|
|
|
bool EqualIgnoringCaseAndTerminalPunct(const WERD_CHOICE &word1,
|
|
const WERD_CHOICE &word2);
|
|
|
|
// Utilities for debug printing.
|
|
void print_ratings_list(
|
|
const char *msg, // intro message
|
|
BLOB_CHOICE_LIST *ratings, // list of results
|
|
const UNICHARSET ¤t_unicharset // unicharset that can be used
|
|
// for id-to-unichar conversion
|
|
);
|
|
|
|
#endif
|