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Detect text with stroke width transform.

License: GNU General Public License v3.0

C++ 98.06% CMake 1.94%

text-detection c-plusplus opencv

detecttext's Introduction

DetectText

Detect text with stroke width transform.

Dependencies

OpenCV 2.4+, boost.

Compile

g++ -o DetectText TextDetection.cpp FeaturesMain.cpp -lopencv_core -lopencv_highgui -lopencv_imgproc -I/path/to/current/directory

where /path/to/current/directory is replaced with the absolute path to the current directory.

Using CMake

mkdir build
cd build
cmake ..
make

To run

./TextDetection input_file output_file dark_on_light where dark_on_light is 1 or 0, indicating whether the text is darker or lighter than the background.

Details on the algorithm can be found in: http://www.cs.cornell.edu/courses/cs4670/2010fa/projects/final/results/group_of_arp86_sk2357/Writeup.pdf

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detecttext's Issues

Compilation error (undefined reference) in OpenCV v3.2 in Ubuntu 18.04

I tried to compile and run in in a fresh Ubuntu 18.04 with the following packages installed:

libboost-all-dev
libopencv-dev
build-essential

I got the following compilation error:

user@host$ g++ -o DetectText TextDetection.cpp FeaturesMain.cpp -lopencv_core -lopencv_highgui -lopencv_imgproc -I$PWD -std=c++14
/tmp/cczWcHDX.o: In function `DetectText::textDetection(cv::Mat const&, bool)':
TextDetection.cpp:(.text+0x214b): undefined reference to `cv::imwrite(cv::String const&, cv::_InputArray const&, std::vector<int, std::allocator<int> > const&)'
TextDetection.cpp:(.text+0x27dc): undefined reference to `cv::imwrite(cv::String const&, cv::_InputArray const&, std::vector<int, std::allocator<int> > const&)'
TextDetection.cpp:(.text+0x2973): undefined reference to `cv::imwrite(cv::String const&, cv::_InputArray const&, std::vector<int, std::allocator<int> > const&)'
/tmp/ccuK5nnV.o: In function `loadByteImage(char const*)':
FeaturesMain.cpp:(.text+0xfc): undefined reference to `cv::imread(cv::String const&, int)'
/tmp/ccuK5nnV.o: In function `loadFloatImage(char const*)':
FeaturesMain.cpp:(.text+0x29c): undefined reference to `cv::imread(cv::String const&, int)'
/tmp/ccuK5nnV.o: In function `mainTextDetection(int, char**)':
FeaturesMain.cpp:(.text+0x5d6): undefined reference to `cv::imwrite(cv::String const&, cv::_InputArray const&, std::vector<int, std::allocator<int> > const&)'
collect2: error: ld returned 1 exit status

Not an issue but an enquiry

Can I use this code snippet into my android java project and
if I can will this code be efficient and could you please tell me which file to call I have no idea about C++ and started working on NDK for the first time .
Thanks in advance

Segmentation fault

I compiled it on centos as per your instructions in README. But it is giving Segmentation fault.

Any idea why?

Compilation error on Ubuntu 14.04

Getting the following error:

# g++ -o DetectText TextDetection.cpp FeaturesMain.cpp -lopencv_core -lopencv_highgui -lopencv_imgproc -I/path/to/current/directory
TextDetection.cpp: In function ‘std::vector<std::pair<cv::Point_<int>, cv::Point_<int> > > DetectText::findBoundingBoxes(std::vector<std::vector<DetectText::SWTPoint2d> >&, std::vector<DetectText::Chain>&, std::vector<std::pair<DetectText::SWTPoint2d, DetectText::SWTPoint2d> >&, cv::Mat&)’:
TextDetection.cpp:63:16: error: ISO C++ forbids declaration of ‘chainit’ with no type [-fpermissive]
     for (auto& chainit : chains) {
                ^
TextDetection.cpp:63:26: error: range-based ‘for’ loops are not allowed in C++98 mode
     for (auto& chainit : chains) {
                          ^
TextDetection.cpp:68:61: error: request for member ‘components’ in ‘chainit’, which is of non-class type ‘int’
         for (std::vector<int>::const_iterator cit = chainit.components.begin(); cit != chainit.components.end(); cit++) {
                                                             ^
TextDetection.cpp:68:96: error: request for member ‘components’ in ‘chainit’, which is of non-class type ‘int’
         for (std::vector<int>::const_iterator cit = chainit.components.begin(); cit != chainit.components.end(); cit++) {
                                                                                                ^
TextDetection.cpp: In function ‘std::vector<std::pair<cv::Point_<int>, cv::Point_<int> > > DetectText::findBoundingBoxes(std::vector<std::vector<DetectText::SWTPoint2d> >&, cv::Mat&)’:
TextDetection.cpp:86:16: error: ISO C++ forbids declaration of ‘compit’ with no type [-fpermissive]
     for (auto& compit : components) {
                ^
TextDetection.cpp:86:25: error: range-based ‘for’ loops are not allowed in C++98 mode
     for (auto& compit : components) {
                         ^
TextDetection.cpp:91:20: error: ISO C++ forbids declaration of ‘it’ with no type [-fpermissive]
         for (auto& it : compit) {
                    ^
TextDetection.cpp:91:25: error: range-based ‘for’ loops are not allowed in C++98 mode
         for (auto& it : compit) {
                         ^
TextDetection.cpp:92:37: error: request for member ‘y’ in ‘it’, which is of non-class type ‘int’
             miny = std::min(miny,it.y);
                                     ^
TextDetection.cpp:93:37: error: request for member ‘x’ in ‘it’, which is of non-class type ‘int’
             minx = std::min(minx,it.x);
                                     ^
TextDetection.cpp:94:37: error: request for member ‘y’ in ‘it’, which is of non-class type ‘int’
             maxy = std::max(maxy,it.y);
                                     ^
TextDetection.cpp:95:37: error: request for member ‘x’ in ‘it’, which is of non-class type ‘int’
             maxx = std::max(maxx,it.x);
                                     ^
TextDetection.cpp: In function ‘void DetectText::renderComponents(const cv::Mat&, std::vector<std::vector<DetectText::SWTPoint2d> >&, cv::Mat&)’:
TextDetection.cpp:144:13: error: ISO C++ forbids declaration of ‘component’ with no type [-fpermissive]
  for (auto& component : components) {
             ^
TextDetection.cpp:144:25: error: range-based ‘for’ loops are not allowed in C++98 mode
  for (auto& component : components) {
                         ^
TextDetection.cpp:145:20: error: ISO C++ forbids declaration of ‘pit’ with no type [-fpermissive]
         for (auto& pit : component) {
                    ^
TextDetection.cpp:145:26: error: range-based ‘for’ loops are not allowed in C++98 mode
         for (auto& pit : component) {
                          ^
TextDetection.cpp:146:34: error: request for member ‘y’ in ‘pit’, which is of non-class type ‘int’
             output.at<float>(pit.y, pit.x) = SWTImage.at<float>(pit.y, pit.x);
                                  ^
TextDetection.cpp:146:41: error: request for member ‘x’ in ‘pit’, which is of non-class type ‘int’
             output.at<float>(pit.y, pit.x) = SWTImage.at<float>(pit.y, pit.x);
                                         ^
TextDetection.cpp:146:69: error: request for member ‘y’ in ‘pit’, which is of non-class type ‘int’
             output.at<float>(pit.y, pit.x) = SWTImage.at<float>(pit.y, pit.x);
                                                                     ^
TextDetection.cpp:146:76: error: request for member ‘x’ in ‘pit’, which is of non-class type ‘int’
             output.at<float>(pit.y, pit.x) = SWTImage.at<float>(pit.y, pit.x);
                                                                            ^
TextDetection.cpp: In function ‘void DetectText::renderComponentsWithBoxes(cv::Mat&, std::vector<std::vector<DetectText::SWTPoint2d> >&, std::vector<std::pair<DetectText::SWTPoint2d, DetectText::SWTPoint2d> >&, cv::Mat&)’:
TextDetection.cpp:194:16: error: ISO C++ forbids declaration of ‘it’ with no type [-fpermissive]
     for (auto& it : compBB) {
                ^
TextDetection.cpp:194:21: error: range-based ‘for’ loops are not allowed in C++98 mode
     for (auto& it : compBB) {
                     ^
TextDetection.cpp:195:33: error: request for member ‘first’ in ‘it’, which is of non-class type ‘int’
         Point2i p0 = cvPoint(it.first.x,  it.first.y);
                                 ^
TextDetection.cpp:195:46: error: request for member ‘first’ in ‘it’, which is of non-class type ‘int’
         Point2i p0 = cvPoint(it.first.x,  it.first.y);
                                              ^
TextDetection.cpp:196:33: error: request for member ‘second’ in ‘it’, which is of non-class type ‘int’
         Point2i p1 = cvPoint(it.second.x, it.second.y);
                                 ^
TextDetection.cpp:196:46: error: request for member ‘second’ in ‘it’, which is of non-class type ‘int’
         Point2i p1 = cvPoint(it.second.x, it.second.y);
                                              ^
TextDetection.cpp:206:15: error: ‘it’ does not name a type
     for (auto it : bb) {
               ^
TextDetection.cpp:220:1: error: expected ‘;’ before ‘}’ token
 }
 ^
TextDetection.cpp:220:1: error: expected primary-expression before ‘}’ token
TextDetection.cpp:220:1: error: expected ‘;’ before ‘}’ token
TextDetection.cpp:220:1: error: expected primary-expression before ‘}’ token
TextDetection.cpp:220:1: error: expected ‘)’ before ‘}’ token
TextDetection.cpp:220:1: error: expected primary-expression before ‘}’ token
TextDetection.cpp:220:1: error: expected ‘;’ before ‘}’ token
TextDetection.cpp: In function ‘void DetectText::renderChainsWithBoxes(cv::Mat&, std::vector<std::vector<DetectText::SWTPoint2d> >&, std::vector<DetectText::Chain>&, std::vector<std::pair<DetectText::SWTPoint2d, DetectText::SWTPoint2d> >&, cv::Mat&)’:
TextDetection.cpp:233:22: error: range-based ‘for’ loops are not allowed in C++98 mode
     for (Chain& it : chains) {
                      ^
TextDetection.cpp:256:16: error: ISO C++ forbids declaration of ‘it’ with no type [-fpermissive]
     for (auto& it : bb) {
                ^
TextDetection.cpp:256:21: error: range-based ‘for’ loops are not allowed in C++98 mode
     for (auto& it : bb) {
                     ^
TextDetection.cpp:268:30: error: request for member ‘first’ in ‘it’, which is of non-class type ‘int’
         rectangle(output, it.first, it.second, c, 2);
                              ^
TextDetection.cpp:268:40: error: request for member ‘second’ in ‘it’, which is of non-class type ‘int’
         rectangle(output, it.first, it.second, c, 2);
                                        ^
TextDetection.cpp: In function ‘void DetectText::SWTMedianFilter(cv::Mat&, std::vector<DetectText::Ray>&)’:
TextDetection.cpp:474:16: error: ISO C++ forbids declaration of ‘rit’ with no type [-fpermissive]
     for (auto& rit : rays) {
                ^
TextDetection.cpp:474:22: error: range-based ‘for’ loops are not allowed in C++98 mode
     for (auto& rit : rays) {
                      ^
TextDetection.cpp:475:20: error: ISO C++ forbids declaration of ‘pit’ with no type [-fpermissive]
         for (auto& pit : rit.points) {
                    ^
TextDetection.cpp:475:26: error: range-based ‘for’ loops are not allowed in C++98 mode
         for (auto& pit : rit.points) {
                          ^
TextDetection.cpp:475:30: error: request for member ‘points’ in ‘rit’, which is of non-class type ‘int’
         for (auto& pit : rit.points) {
                              ^
TextDetection.cpp:476:17: error: request for member ‘SWT’ in ‘pit’, which is of non-class type ‘int’
             pit.SWT = SWTImage.at<float>(pit.y, pit.x);
                 ^
TextDetection.cpp:476:46: error: request for member ‘y’ in ‘pit’, which is of non-class type ‘int’
             pit.SWT = SWTImage.at<float>(pit.y, pit.x);
                                              ^
TextDetection.cpp:476:53: error: request for member ‘x’ in ‘pit’, which is of non-class type ‘int’
             pit.SWT = SWTImage.at<float>(pit.y, pit.x);
                                                     ^
TextDetection.cpp:478:23: error: request for member ‘points’ in ‘rit’, which is of non-class type ‘int’
         std::sort(rit.points.begin(), rit.points.end(), &Point2dSort);
                       ^
TextDetection.cpp:478:43: error: request for member ‘points’ in ‘rit’, which is of non-class type ‘int’
         std::sort(rit.points.begin(), rit.points.end(), &Point2dSort);
                                           ^
TextDetection.cpp:479:29: error: request for member ‘points’ in ‘rit’, which is of non-class type ‘int’
         float median = (rit.points[rit.points.size()/2]).SWT;
                             ^
TextDetection.cpp:479:40: error: request for member ‘points’ in ‘rit’, which is of non-class type ‘int’
         float median = (rit.points[rit.points.size()/2]).SWT;
                                        ^
TextDetection.cpp:480:20: error: ISO C++ forbids declaration of ‘pit’ with no type [-fpermissive]
         for (auto& pit : rit.points) {
                    ^
TextDetection.cpp:480:26: error: range-based ‘for’ loops are not allowed in C++98 mode
         for (auto& pit : rit.points) {
                          ^
TextDetection.cpp:480:30: error: request for member ‘points’ in ‘rit’, which is of non-class type ‘int’
         for (auto& pit : rit.points) {
                              ^
TextDetection.cpp:481:36: error: request for member ‘y’ in ‘pit’, which is of non-class type ‘int’
             SWTImage.at<float>(pit.y, pit.x) = std::min(pit.SWT, median);
                                    ^
TextDetection.cpp:481:43: error: request for member ‘x’ in ‘pit’, which is of non-class type ‘int’
             SWTImage.at<float>(pit.y, pit.x) = std::min(pit.SWT, median);
                                           ^
TextDetection.cpp:481:61: error: request for member ‘SWT’ in ‘pit’, which is of non-class type ‘int’
             SWTImage.at<float>(pit.y, pit.x) = std::min(pit.SWT, median);

Error during conversion to Opencv 2.4.2

Hi,
I am very much interested in using this algorithm for my text recognition system. Your code was using IplImages and older form of opencv and so decided to change it to cv::Mat and use the newer functions. But I am getting not getting the actual outputs which I had got for your code. I know it sounds weird but could you help me out on this.

Vivek

Cannot compile against opencv 2.4

I'm using ubuntu 14.04 and installing the opencv libs via:

apt-get install libopencv-core2.4 libopencv-core-dev

but when I compile it's telling me it can't find the opencv/cv.h header file. When I look in /usr/include I'm not seeing it there either, instead I'm seeing opencv2/opencv.hpp

in line 528... and after

...&&((_ptr)/right <= 3.0 || right/(_ptr) <= 3.0)

Correct me if I am wrong, but this is always true. If You have two real numbers, like 'a' and 'b', a/b or b/a should be less than 1. I think because of this, things get connected which should not be, and we will have huge components.

infinite loop: after run this code "findLegallyConnectedComponents "

I wonder that when the function""findLegallyConnectedComponents " is planning to return,but it stuck into returning .Could someone help me with that?

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