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Adds OCRTesseract class and sample demo

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lluis 10 years ago
parent 70a2bca24a
commit 5c89c786f2
7 changed files with 685 additions and 0 deletions
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  1. 23
      modules/text/CMakeLists.txt
  2. 24
      modules/text/FindTesseract.cmake
  3. 1
      modules/text/include/opencv2/text.hpp
  4. 110
      modules/text/include/opencv2/text/ocr.hpp
  5. 343
      modules/text/samples/end_to_end_recognition.cpp
  6. 177
      modules/text/src/ocr.cpp
  7. 7
      modules/text/text_config.hpp.in

23
modules/text/CMakeLists.txt
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@ -1,2 +1,25 @@
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} ${CMAKE_CURRENT_SOURCE_DIR})
find_package(Tesseract)
if(Tesseract_FOUND)
message(STATUS "Tesseract: YES")
set(HAVE_TESSERACT 1)
else()
message(STATUS "Tesseract: NO")
endif()
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/text_config.hpp.in
${CMAKE_BINARY_DIR}/text_config.hpp @ONLY)
include_directories(${CMAKE_CURRENT_BINARY_DIR})
if(${Tesseract_FOUND})
include_directories(${Tesseract_INCLUDE_DIR})
endif()
set(the_description "Text Detection and Recognition")
ocv_define_module(text opencv_ml opencv_highgui opencv_imgproc opencv_core)
if(${Tesseract_FOUND})
target_link_libraries(opencv_text ${Tesseract_LIBS})
endif()

24
modules/text/FindTesseract.cmake
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# Tesseract OCR
unset(Tesseract_FOUND)
find_path(Tesseract_INCLUDE_DIR tesseract/baseapi.h
HINTS
/usr/include
/usr/local/include)
find_library(Tesseract_LIBRARY NAMES tesseract
HINTS
/usr/lib
/usr/local/lib)
find_library(Lept_LIBRARY NAMES lept
HINTS
/usr/lib
/usr/local/lib)
set(Tesseract_LIBS ${Tesseract_LIBRARY} ${Lept_LIBRARY})
if(Tesseract_LIBS AND Tesseract_INCLUDE_DIR)
set(Tesseract_FOUND 1)
endif()

1
modules/text/include/opencv2/text.hpp
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@ -40,5 +40,6 @@ the use of this software, even if advised of the possibility of such damage.
#define __OPENCV_TEXT_HPP__
#include "opencv2/text/erfilter.hpp"
#include "opencv2/text/ocr.hpp"
#endif

110
modules/text/include/opencv2/text/ocr.hpp
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/*M///////////////////////////////////////////////////////////////////////////////////////
//
// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
// By downloading, copying, installing or using the software you agree to this license.
// If you do not agree to this license, do not download, install,
// copy or use the software.
//
//
// License Agreement
// For Open Source Computer Vision Library
//
// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
// Copyright (C) 2013, OpenCV Foundation, all rights reserved.
// Third party copyrights are property of their respective owners.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistribution's of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistribution's in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * The name of the copyright holders may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors "as is" and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
//
//M*/
#ifndef __OPENCV_TEXT_OCR_HPP__
#define __OPENCV_TEXT_OCR_HPP__
#include "text_config.hpp"
#ifdef HAVE_TESSERACT
#include <tesseract/baseapi.h>
#include <tesseract/resultiterator.h>
#endif
#include "opencv2/core.hpp"
#include <vector>
#include <string>
namespace cv
{
namespace text
{
using namespace std;
enum
{
OCR_LEVEL_WORD,
OCR_LEVEL_TEXTLINE
};
#ifdef HAVE_TESSERACT
class CV_EXPORTS OCRTesseract
{
private:
tesseract::TessBaseAPI tess;
public:
//Default constructor
OCRTesseract(const char* datapath=NULL, const char* language=NULL, const char* char_whitelist=NULL,
tesseract::OcrEngineMode oem=tesseract::OEM_DEFAULT, tesseract::PageSegMode psmode=tesseract::PSM_AUTO);
~OCRTesseract();
void run(Mat& image, string& output_text, vector<Rect>* component_rects=NULL,
vector<string>* component_texts=NULL, vector<float>* component_confidences=NULL,
int component_level=0);
};
#else
//stub
class CV_EXPORTS OCRTesseract
{
public:
//Default constructor
OCRTesseract(const char* datapath=NULL, const char* language=NULL, const char* char_whitelist=NULL,
int oem=0, int psmode=0);
~OCRTesseract();
void run(Mat& image, string& output_text, vector<Rect>* component_rects=NULL,
vector<string>* component_texts=NULL, vector<float>* component_confidences=NULL,
int component_level=0);
};
#endif
}
}
#endif // _OPENCV_TEXT_OCR_HPP_

343
modules/text/samples/end_to_end_recognition.cpp
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/*
* textdetection.cpp
*
* A demo program of End-to-end Scene Text Detection and Recognition:
* Shows the use of the Tesseract OCR API with the Extremal Region Filter algorithm described in:
* Neumann L., Matas J.: Real-Time Scene Text Localization and Recognition, CVPR 2012
*
* Created on: Jul 31, 2014
* Author: Lluis Gomez i Bigorda <lgomez AT cvc.uab.es>
*/
#include "opencv2/text.hpp"
#include "opencv2/core/utility.hpp"
#include "opencv2/highgui.hpp"
#include "opencv2/imgproc.hpp"
#include <iostream>
using namespace std;
using namespace cv;
using namespace cv::text;
//Calculate edit distance netween two words
size_t edit_distance(const string& A, const string& B);
size_t min(size_t x, size_t y, size_t z);
bool isRepetitive(const string& s);
bool sort_by_lenght(const string &a, const string &b);
//Draw ER's in an image via floodFill
void er_draw(vector<Mat> &channels, vector<vector<ERStat> > &regions, vector<Vec2i> group, Mat& segmentation);
//Perform text detection and recognition and evaluate results using edit distance
int main(int argc, char* argv[])
{
cout << endl << argv[0] << endl << endl;
cout << "A demo program of End-to-end Scene Text Detection and Recognition: " << endl;
cout << "Shows the use of the Tesseract OCR API with the Extremal Region Filter algorithm described in:" << endl;
cout << "Neumann L., Matas J.: Real-Time Scene Text Localization and Recognition, CVPR 2012" << endl << endl;
Mat image;
if(argc>1)
image = imread(argv[1]);
else
{
cout << " Usage: " << argv[0] << " <input_image> [<gt_word1> ... <gt_wordN>]" << endl;
return(0);
}
cout << "IMG_W=" << image.cols << endl;
cout << "IMG_H=" << image.rows << endl;
/*Text Detection*/
// Extract channels to be processed individually
vector<Mat> channels;
Mat grey;
cvtColor(image,grey,COLOR_RGB2GRAY);
// Notice here we are only using grey channel, see textdetection.cpp for example with more channels
channels.push_back(grey);
channels.push_back(255-grey);
double t_d = getTickCount();
// Create ERFilter objects with the 1st and 2nd stage default classifiers
Ptr<ERFilter> er_filter1 = createERFilterNM1(loadClassifierNM1("trained_classifierNM1.xml"),8,0.00015,0.13,0.2,true,0.1);
Ptr<ERFilter> er_filter2 = createERFilterNM2(loadClassifierNM2("trained_classifierNM2.xml"),0.5);
vector<vector<ERStat> > regions(channels.size());
// Apply the default cascade classifier to each independent channel (could be done in parallel)
for (int c=0; c<(int)channels.size(); c++)
{
er_filter1->run(channels[c], regions[c]);
er_filter2->run(channels[c], regions[c]);
}
cout << "TIME_REGION_DETECTION = " << ((double)getTickCount() - t_d)*1000/getTickFrequency() << endl;
Mat out_img_decomposition= Mat::zeros(image.rows+2, image.cols+2, CV_8UC1);
vector<Vec2i> tmp_group;
for (int i=0; i<(int)regions.size(); i++)
{
for (int j=0; j<(int)regions[i].size();j++)
{
tmp_group.push_back(Vec2i(i,j));
}
Mat tmp= Mat::zeros(image.rows+2, image.cols+2, CV_8UC1);
er_draw(channels, regions, tmp_group, tmp);
if (i > 0)
tmp = tmp / 2;
out_img_decomposition = out_img_decomposition | tmp;
tmp_group.clear();
}
double t_g = getTickCount();
// Detect character groups
vector< vector<Vec2i> > nm_region_groups;
vector<Rect> nm_boxes;
erGrouping(image, channels, regions, nm_region_groups, nm_boxes,ERGROUPING_ORIENTATION_HORIZ);
cout << "TIME_GROUPING = " << ((double)getTickCount() - t_g)*1000/getTickFrequency() << endl;
/*Text Recognition (OCR)*/
double t_r = getTickCount();
OCRTesseract* ocr = new OCRTesseract();
cout << "TIME_OCR_INITIALIZATION = " << ((double)getTickCount() - t_r)*1000/getTickFrequency() << endl;
string output;
Mat out_img;
Mat out_img_detection;
Mat out_img_segmentation = Mat::zeros(image.rows+2, image.cols+2, CV_8UC1);
image.copyTo(out_img);
image.copyTo(out_img_detection);
float scale_img = 600./image.rows;
float scale_font = (2-scale_img)/1.4;
vector<string> words_detection;
t_r = getTickCount();
for (int i=0; i<(int)nm_boxes.size(); i++)
{
rectangle(out_img_detection, nm_boxes[i].tl(), nm_boxes[i].br(), Scalar(0,255,255), 3);
Mat group_img = Mat::zeros(image.rows+2, image.cols+2, CV_8UC1);
er_draw(channels, regions, nm_region_groups[i], group_img);
Mat group_segmentation;
group_img.copyTo(group_segmentation);
//image(nm_boxes[i]).copyTo(group_img);
group_img(nm_boxes[i]).copyTo(group_img);
copyMakeBorder(group_img,group_img,15,15,15,15,BORDER_CONSTANT,Scalar(0));
vector<Rect> boxes;
vector<string> words;
vector<float> confidences;
ocr->run(group_img, output, &boxes, &words, &confidences, OCR_LEVEL_WORD);
output.erase(remove(output.begin(), output.end(), '\n'), output.end());
//cout << "OCR output = \"" << output << "\" lenght = " << output.size() << endl;
if (output.size() < 3)
continue;
for (int j=0; j<(int)boxes.size(); j++)
{
boxes[j].x += nm_boxes[i].x-15;
boxes[j].y += nm_boxes[i].y-15;
//cout << " word = " << words[j] << "\t confidence = " << confidences[j] << endl;
if ((words[j].size() < 2) || (confidences[j] < 51) ||
((words[j].size()==2) && (words[j][0] == words[j][1])) ||
((words[j].size()< 4) && (confidences[j] < 60)) ||
isRepetitive(words[j]))
continue;
words_detection.push_back(words[j]);
rectangle(out_img, boxes[j].tl(), boxes[j].br(), Scalar(255,0,255),3);
Size word_size = getTextSize(words[j], FONT_HERSHEY_SIMPLEX, scale_font, 3*scale_font, NULL);
rectangle(out_img, boxes[j].tl()-Point(3,word_size.height+3), boxes[j].tl()+Point(word_size.width,0), Scalar(255,0,255),-1);
putText(out_img, words[j], boxes[j].tl()-Point(1,1), FONT_HERSHEY_SIMPLEX, scale_font, Scalar(255,255,255),3*scale_font);
out_img_segmentation = out_img_segmentation | group_segmentation;
}
}
cout << "TIME_OCR = " << ((double)getTickCount() - t_r)*1000/getTickFrequency() << endl;
/* Recognition evaluation with (approximate) hungarian matching and edit distances */
if(argc>2)
{
int num_gt_characters = 0;
vector<string> words_gt;
for (int i=2; i<argc; i++)
{
string s = string(argv[i]);
if (s.size() > 0)
{
words_gt.push_back(string(argv[i]));
//cout << " GT word " << words_gt[words_gt.size()-1] << endl;
num_gt_characters += words_gt[words_gt.size()-1].size();
}
}
if (words_detection.empty())
{
//cout << endl << "number of characters in gt = " << num_gt_characters << endl;
cout << "TOTAL_EDIT_DISTANCE = " << num_gt_characters << endl;
cout << "EDIT_DISTANCE_RATIO = 1" << endl;
}
else
{
sort(words_gt.begin(),words_gt.end(),sort_by_lenght);
int max_dist=0;
vector< vector<int> > assignment_mat;
for (int i=0; i<(int)words_gt.size(); i++)
{
vector<int> assignment_row(words_detection.size(),0);
assignment_mat.push_back(assignment_row);
for (int j=0; j<(int)words_detection.size(); j++)
{
assignment_mat[i][j] = edit_distance(words_gt[i],words_detection[j]);
max_dist = max(max_dist,assignment_mat[i][j]);
}
}
vector<int> words_detection_matched;
int total_edit_distance = 0;
int tp=0, fp=0, fn=0;
for (int search_dist=0; search_dist<=max_dist; search_dist++)
{
for (int i=0; i<(int)assignment_mat.size(); i++)
{
int min_dist_idx = distance(assignment_mat[i].begin(),
min_element(assignment_mat[i].begin(),assignment_mat[i].end()));
if (assignment_mat[i][min_dist_idx] == search_dist)
{
//cout << " GT word \"" << words_gt[i] << "\" best match \"" << words_detection[min_dist_idx] << "\" with dist " << assignment_mat[i][min_dist_idx] << endl;
if(search_dist == 0)
tp++;
else { fp++; fn++; }
total_edit_distance += assignment_mat[i][min_dist_idx];
words_detection_matched.push_back(min_dist_idx);
words_gt.erase(words_gt.begin()+i);
assignment_mat.erase(assignment_mat.begin()+i);
for (int j=0; j<(int)assignment_mat.size(); j++)
{
assignment_mat[j][min_dist_idx]=INT_MAX;
}
i--;
}
}
}
for (int j=0; j<(int)words_gt.size(); j++)
{
//cout << " GT word \"" << words_gt[j] << "\" no match found" << endl;
fn++;
total_edit_distance += words_gt[j].size();
}
for (int j=0; j<(int)words_detection.size(); j++)
{
if (find(words_detection_matched.begin(),words_detection_matched.end(),j) == words_detection_matched.end())
{
//cout << " Detection word \"" << words_detection[j] << "\" no match found" << endl;
fp++;
total_edit_distance += words_detection[j].size();
}
}
//cout << endl << "number of characters in gt = " << num_gt_characters << endl;
cout << "TOTAL_EDIT_DISTANCE = " << total_edit_distance << endl;
cout << "EDIT_DISTANCE_RATIO = " << (float)total_edit_distance / num_gt_characters << endl;
cout << "TP = " << tp << endl;
cout << "FP = " << fp << endl;
cout << "FN = " << fn << endl;
}
}
//resize(out_img_detection,out_img_detection,Size(image.cols*scale_img,image.rows*scale_img));
//imshow("detection", out_img_detection);
//imwrite("detection.jpg", out_img_detection);
//resize(out_img,out_img,Size(image.cols*scale_img,image.rows*scale_img));
namedWindow("recognition",WINDOW_NORMAL);
imshow("recognition", out_img);
waitKey(0);
//imwrite("recognition.jpg", out_img);
//imwrite("segmentation.jpg", out_img_segmentation);
//imwrite("decomposition.jpg", out_img_decomposition);
return 0;
}
size_t min(size_t x, size_t y, size_t z)
{
return x < y ? min(x,z) : min(y,z);
}
size_t edit_distance(const string& A, const string& B)
{
size_t NA = A.size();
size_t NB = B.size();
vector< vector<size_t> > M(NA + 1, vector<size_t>(NB + 1));
for (size_t a = 0; a <= NA; ++a)
M[a][0] = a;
for (size_t b = 0; b <= NB; ++b)
M[0][b] = b;
for (size_t a = 1; a <= NA; ++a)
for (size_t b = 1; b <= NB; ++b)
{
size_t x = M[a-1][b] + 1;
size_t y = M[a][b-1] + 1;
size_t z = M[a-1][b-1] + (A[a-1] == B[b-1] ? 0 : 1);
M[a][b] = min(x,y,z);
}
return M[A.size()][B.size()];
}
bool isRepetitive(const string& s)
{
int count = 0;
for (int i=0; i<(int)s.size(); i++)
{
if ((s[i] == 'i') ||
(s[i] == 'l') ||
(s[i] == 'I'))
count++;
}
if (count > ((int)s.size()+1)/2)
{
return true;
}
return false;
}
void er_draw(vector<Mat> &channels, vector<vector<ERStat> > &regions, vector<Vec2i> group, Mat& segmentation)
{
for (int r=0; r<(int)group.size(); r++)
{
ERStat er = regions[group[r][0]][group[r][1]];
if (er.parent != NULL) // deprecate the root region
{
int newMaskVal = 255;
int flags = 4 + (newMaskVal << 8) + FLOODFILL_FIXED_RANGE + FLOODFILL_MASK_ONLY;
floodFill(channels[group[r][0]],segmentation,Point(er.pixel%channels[group[r][0]].cols,er.pixel/channels[group[r][0]].cols),
Scalar(255),0,Scalar(er.level),Scalar(0),flags);
}
}
}
bool sort_by_lenght(const string &a, const string &b){return (a.size()>b.size());}

177
modules/text/src/ocr.cpp
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/*M///////////////////////////////////////////////////////////////////////////////////////
//
// IMPORTANT: READ BEFORE DOWNLOADING, COPYING, INSTALLING OR USING.
//
// By downloading, copying, installing or using the software you agree to this license.
// If you do not agree to this license, do not download, install,
// copy or use the software.
//
//
// License Agreement
// For Open Source Computer Vision Library
//
// Copyright (C) 2000-2008, Intel Corporation, all rights reserved.
// Copyright (C) 2009, Willow Garage Inc., all rights reserved.
// Third party copyrights are property of their respective owners.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
// * Redistribution's of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistribution's in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * The name of the copyright holders may not be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// This software is provided by the copyright holders and contributors "as is" and
// any express or implied warranties, including, but not limited to, the implied
// warranties of merchantability and fitness for a particular purpose are disclaimed.
// In no event shall the Intel Corporation or contributors be liable for any direct,
// indirect, incidental, special, exemplary, or consequential damages
// (including, but not limited to, procurement of substitute goods or services;
// loss of use, data, or profits; or business interruption) however caused
// and on any theory of liability, whether in contract, strict liability,
// or tort (including negligence or otherwise) arising in any way out of
// the use of this software, even if advised of the possibility of such damage.
//
//M*/
#include "precomp.hpp"
#include "opencv2/imgproc.hpp"
#include "opencv2/ml.hpp"
#include <iostream>
#include <fstream>
#include <queue>
namespace cv
{
namespace text
{
using namespace std;
#ifdef HAVE_TESSERACT
//Default constructor
OCRTesseract::OCRTesseract(const char* datapath, const char* language, const char* char_whitelist, tesseract::OcrEngineMode oemode, tesseract::PageSegMode psmode)
{
const char *lang = "eng";
if (language != NULL)
lang = language;
if (tess.Init(datapath, lang, oemode))
{
cout << "OCRTesseract: Could not initialize tesseract." << endl;
throw 1;
}
//cout << "OCRTesseract: tesseract version " << tess.Version() << endl;
tesseract::PageSegMode pagesegmode = psmode;
tess.SetPageSegMode(pagesegmode);
if(char_whitelist != NULL)
tess.SetVariable("tessedit_char_whitelist", char_whitelist);
else
tess.SetVariable("tessedit_char_whitelist", "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ");
tess.SetVariable("save_best_choices", "T");
}
OCRTesseract::~OCRTesseract()
{
tess.End();
}
void OCRTesseract::run(Mat& image, string& output, vector<Rect>* component_rects,
vector<string>* component_texts, vector<float>* component_confidences, int component_level)
{
CV_Assert( (image.type() == CV_8UC1) || (image.type() == CV_8UC1) );
if (component_texts != 0)
component_texts->clear();
if (component_rects != 0)
component_rects->clear();
if (component_confidences != 0)
component_confidences->clear();
tess.SetImage((uchar*)image.data, image.size().width, image.size().height, image.channels(), image.step1());
tess.Recognize(0);
output = string(tess.GetUTF8Text());
if ( (component_rects != NULL) || (component_texts != NULL) || (component_confidences != NULL) )
{
tesseract::ResultIterator* ri = tess.GetIterator();
tesseract::PageIteratorLevel level = tesseract::RIL_WORD;
if (component_level == OCR_LEVEL_TEXTLINE)
level = tesseract::RIL_TEXTLINE;
if (ri != 0) {
do {
const char* word = ri->GetUTF8Text(level);
if (word == NULL)
continue;
float conf = ri->Confidence(level);
int x1, y1, x2, y2;
ri->BoundingBox(level, &x1, &y1, &x2, &y2);
if (component_texts != 0)
component_texts->push_back(string(word));
if (component_rects != 0)
component_rects->push_back(Rect(x1,y1,x2-x1,y2-y1));
if (component_confidences != 0)
component_confidences->push_back(conf);
delete[] word;
} while (ri->Next(level));
}
delete ri;
}
tess.Clear();
}
#else
//Stub constructor
OCRTesseract::OCRTesseract(const char* datapath, const char* language, const char* char_whitelist, int oemode, int psmode)
{
cout << "OCRTesseract("<<oemode<<psmode<<"): Tesseract not found." << endl;
if (datapath != NULL)
cout << " " << datapath << endl;
if (language != NULL)
cout << " " << language << endl;
if (char_whitelist != NULL)
cout << " " << char_whitelist << endl;
}
//Stub destructor
OCRTesseract::~OCRTesseract()
{
}
//Stub method, does nothing
void OCRTesseract::run(Mat& image, string& output, vector<Rect>* component_rects,
vector<string>* component_texts, vector<float>* component_confidences, int component_level)
{
CV_Assert( (image.type() == CV_8UC1) || (image.type() == CV_8UC1) );
cout << "OCRTesseract(" << component_level << image.type() <<"): Tesseract not found." << endl;
output.clear();
if(component_rects)
component_rects->clear();
if(component_texts)
component_texts->clear();
if(component_confidences)
component_confidences->clear();
}
#endif
}
}

7
modules/text/text_config.hpp.in
Unescape View File

@ -0,0 +1,7 @@
#ifndef __OPENCV_TEXT_CONFIG_HPP__
#define __OPENCV_TEXT_CONFIG_HPP__
// HAVE OCR Tesseract
#cmakedefine HAVE_TESSERACT
#endif
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