From: Jimmy Ma &lt;jimmy.ma(a)lrde.epita.fr&gt; To: olena-patches(a)lrde.epita.fr Subject: r2797: Cleanup OCR preprocessing URL: https://svn.lrde.epita.fr/svn/oln/branches/cleanup-2008/milena/sandbox ChangeLog: 2008-11-04 Jimmy Ma &lt;jimmy.ma(a)lrde.epita.fr&gt; Cleanup OCR preprocessing. * garrigues/ocr/ocr_with_preprocess.cc: Cleanup. * garrigues/ocr/skeleton.hh, garrigues/ocr/tesseract_wrap.hh: Fix typos. --- ocr_with_preprocess.cc | 92 +++++++++++++++++++++---------------------------- skeleton.hh | 4 +- tesseract_wrap.hh | 2 - 3 files changed, 44 insertions(+), 54 deletions(-) Index: branches/cleanup-2008/milena/sandbox/garrigues/ocr/skeleton.hh =================================================================== --- branches/cleanup-2008/milena/sandbox/garrigues/ocr/skeleton.hh (revision 2796) +++ branches/cleanup-2008/milena/sandbox/garrigues/ocr/skeleton.hh (revision 2797) @@ -87,7 +87,7 @@ mln_niter_(neighb2d) n(nbh, p); for_all(p) { - if (!input(p) || dist_map(p) < 20) + if (!input(p) || dist_map(p) < 10) continue; unsigned nb_eq = 0; @@ -120,7 +120,7 @@ int vals[] = { 0, 9, 0, 9, 0, 9, 6, 4, 6, 9, - 0, 4, 0, 4, 0, // Values of distaces. + 0, 4, 0, 4, 0, // Values of distances. 9, 6, 4, 6, 9, 0, 9, 0, 9, 0 }; Index: branches/cleanup-2008/milena/sandbox/garrigues/ocr/tesseract_wrap.hh =================================================================== --- branches/cleanup-2008/milena/sandbox/garrigues/ocr/tesseract_wrap.hh (revision 2796) +++ branches/cleanup-2008/milena/sandbox/garrigues/ocr/tesseract_wrap.hh (revision 2797) @@ -74,7 +74,7 @@ template <typename T> char* tesseract(const char* lang, const mln::image2d<T>& input, float* score) { - assert(!score); + assert(score); TessWrap::InitWithLanguage(NULL, NULL, lang, NULL, false, 0, NULL); char* s = TessWrap::TesseractRect( (unsigned char*) input.buffer(), Index: branches/cleanup-2008/milena/sandbox/garrigues/ocr/ocr_with_preprocess.cc =================================================================== --- branches/cleanup-2008/milena/sandbox/garrigues/ocr/ocr_with_preprocess.cc (revision 2796) +++ branches/cleanup-2008/milena/sandbox/garrigues/ocr/ocr_with_preprocess.cc (revision 2797) @@ -58,12 +58,13 @@ #include <mln/logical/not.hh> #include "tesseract_wrap.hh" +#include <mln/subsampling/subsampling.hh> // _COMPILATION_ // g++ -DNDEBUG -O3 -I../../.. ocr.cc -L/usr/lib -ltesseract_full -lpthread -#if 0 -# define TEST(Var) \ +#if 1 +# define OCR_TEST(Var) \ { \ image2d<int_u8> tmp = clone(cast_image<int_u8>(Var)); \ float score = 0.f; \ @@ -72,7 +73,7 @@ delete[] s; \ } #else -# define TEST(Var) +# define OCR_TEST(Var) #endif @@ -92,80 +93,69 @@ mln::border::thickness = 0; io::pbm::load(input, argv[1]); - TEST(input); + OCR_TEST(input); // Resize - //std::cerr << "Enlarge the image" << std::endl; image2d<int_u8> enlarged = enlarge(logical::not_(input), 2); - //image2d<bool> enlarged = geom::resize(logical::not_(input), 4); - io::pgm::save(enlarged, "1_enlarge.pgm"); - TEST(enlarged); + io::pgm::save(enlarged, std::string(argv[2]) + "_1_enlarge.pgm"); + OCR_TEST(enlarged); // Blur. - //std::cerr << "Blur the enlarged image" << std::endl; -// image2d<int_u8> blur = linear::gaussian(fun::p2v::ternary(pw::value(enlarged), pw::cst(int_u8(255)), pw::cst(int_u8(0))) | enlarged.domain(), -// 4); - image2d<int_u8> blur = linear::gaussian(clone(enlarged), 1); - - io::pgm::save(blur, "2_gaussian.pgm"); - TEST(blur); - - // Crest. -// image2d<bool> c = crest(enlarged, blur, c4()); -// io::pbm::save(c, "3_crest.pbm"); - + image2d<int_u8> blur = linear::gaussian(enlarged, 2); + io::pgm::save(blur, std::string(argv[2]) + "_2_gaussian.pgm"); + OCR_TEST(blur); // Threshold image2d<bool> binary; { - //std::cerr << "Threshold the blur image" << std::endl; - -// // Compute the histogram. -// histo::data<int_u8> h = histo::compute(blur); -// image1d<std::size_t> h_ima = convert::to_image(h); - -// // Blur the histogram. -// h_ima = linear::gaussian(h_ima, 4); - -// // Get the maxima. -// unsigned n; -// image1d<std::size_t> maxs = regional_maxima(h_ima, c2(), n); -// mln_piter() - - initialize(binary, blur); mln_piter_(image2d<int_u8>) p(blur.domain()); for_all(p) binary(p) = blur(p) > 100; - io::pbm::save(binary, "3_threshold.pbm"); - TEST(binary); + io::pbm::save(binary, std::string(argv[2]) + "_3_threshold.pbm"); + OCR_TEST(binary); } // Skeleton - //std::cerr << "Compute the skeleton" << std::endl; image2d<bool> skel = skeleton(binary, 4); - io::pbm::save(skel, "4_skeleton.pbm"); - TEST(skel); + io::pbm::save(skel, std::string(argv[2]) + "_4_skeleton.pbm"); + OCR_TEST(skel); // Dilation - //std::cerr << "Dilate the skeleton" << std::endl; - win::octagon2d oct(7); - for (unsigned i = 0; i < 1; i++) - skel = morpho::dilation(skel, oct); + image2d<bool> dilate; + win::octagon2d oct(5); + { // FIXME? +#if 1 + image2d<int_u8> tmp; + initialize(tmp, skel); + initialize(dilate, skel); + mln_piter_(image2d<int_u8>) p(tmp.domain()); + for_all(p) + tmp(p) = skel(p); + tmp = morpho::dilation(tmp, oct); + for_all(p) + dilate(p) = tmp(p); +#else + // Should be using this but it doesn't work :( + dilate = morpho::dilation(skel, oct); +#endif + } + + io::pbm::save(dilate, std::string(argv[2]) + "_5_dilation.pbm"); + OCR_TEST(dilate); - io::pbm::save(skel, "5_dilation.pbm"); - TEST(skel); + // Subsampling + image2d<bool> subsampled = subsampling::subsampling(dilate, dpoint2d(1,1), 2); + io::pbm::save(subsampled, std::string(argv[2]) + "_6_subsampling.pbm"); + OCR_TEST(subsampled); - io::pbm::save(skel, argv[2]); + io::pbm::save(subsampled, argv[2]); - //std::cerr << "Text recognition" << std::endl; - //char* s = tesseract("fra", clone(logical::not_(skel))); { - image2d<int_u8> tmp = clone(cast_image<int_u8>(skel)); float score = 0; - char* s = tesseract("fra", tmp, &score); + char* s = tesseract("fra", subsampled, &score); std::cerr << "Tesseract result: (score " << score << ")" << std::endl; std::cout << s; delete[] s;