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Diffstat (limited to 'leptonica/prog/dewarprules.c')
| -rw-r--r-- | leptonica/prog/dewarprules.c | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/leptonica/prog/dewarprules.c b/leptonica/prog/dewarprules.c new file mode 100644 index 00000000..3eab1e1f --- /dev/null +++ b/leptonica/prog/dewarprules.c @@ -0,0 +1,176 @@ +/*====================================================================* + - Copyright (C) 2001 Leptonica. All rights reserved. + - + - Redistribution and use in source and binary forms, with or without + - modification, are permitted provided that the following conditions + - are met: + - 1. Redistributions of source code must retain the above copyright + - notice, this list of conditions and the following disclaimer. + - 2. Redistributions 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. + - + - 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 ANY + - 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. + *====================================================================*/ + +/* + * dewarprules.c + * + * Syntax: dewarprules select ndew + * where select = 0 (sudoku), 1 (graph paper) + * ndew = 1 (simple) or 2 (twice with rotations) + * + * There are two ways to dewarp the images: + * (1) use dewarpBuildLineModel() to correct both vertical and + * horizontal disparity with 1 dew + * (2) use dewarpBuildPageModel() twice, correcting only for + * vertical disparity, with 90 degree rotations in between + * and at the end. + * + * A challenge was presented in: + * http://stackoverflow.com/questions/10196198/how-to-remove-convexity-defects-in-sudoku-square/10226971#10226971 + * + * Solutions were given there using mathematica and opencv. + */ + +#ifdef HAVE_CONFIG_H +#include <config_auto.h> +#endif /* HAVE_CONFIG_H */ + +#include "string.h" +#include "allheaders.h" + +l_int32 main(int argc, + char **argv) +{ +l_int32 w, h, select, ndew; +BOXA *boxa1; +L_DEWARP *dew; +L_DEWARPA *dewa; +PIX *pixs, *pixd, *pix1, *pix2, *pix3, *pix4, *pix5, *pix6, *pix7; +PIX *pix8, *pix9, *pix10; +PIXA *pixa1, *pixa2; + + if (argc != 3) { + lept_stderr(" Syntax: dewarprules select ndew\n"); + return 1; + } + select = atoi(argv[1]); + ndew = atoi(argv[2]); + + setLeptDebugOK(1); + lept_mkdir("dewarp"); + + if (select == 0) { + /* Extract the basic grid from the sudoku image */ + pixs = pixRead("warped_sudoku.jpg"); + pixGetDimensions(pixs, &w, &h, NULL); + pix1 = pixConvertTo1(pixs, 220); + boxa1 = pixConnComp(pix1, &pixa1, 8); + pixa2 = pixaSelectBySize(pixa1, 400, 400, L_SELECT_IF_BOTH, + L_SELECT_IF_GT, NULL); + pix2 = pixaDisplay(pixa2, w, h); /* grid */ + pixDisplay(pix1, 600, 300); + pixDisplay(pix2, 100, 100); + } else { /* select == 1 */ + /* Extract the grid from the graph paper image */ + pixs = pixRead("warped_paper.jpg"); + pixDisplay(pixs, 1500, 1000); + pix3 = pixConvertTo8(pixs, 0); + pix4 = pixBackgroundNormSimple(pix3, NULL, NULL); + pix5 = pixGammaTRC(NULL, pix4, 1.0, 50, 200); + pix1 = pixConvertTo1(pix5, 220); + pixGetDimensions(pix1, &w, &h, NULL); + boxa1 = pixConnComp(pix1, &pixa1, 8); + pixa2 = pixaSelectBySize(pixa1, 400, 400, L_SELECT_IF_BOTH, + L_SELECT_IF_GT, NULL); + pix2 = pixaDisplay(pixa2, w, h); /* grid */ + pixDisplay(pix1, 600, 300); + pixDisplay(pix2, 600, 400); + pixDestroy(&pix3); + pixDestroy(&pix4); + pixDestroy(&pix5); + } + + if (ndew == 1) { + /* -------------------------------------------------------------------* + * Use dewarpBuildLineModel() to correct using both horizontal + * and vertical lines with one dew. + * -------------------------------------------------------------------*/ + dewa = dewarpaCreate(1, 30, 1, 4, 50); + dewarpaSetCurvatures(dewa, 500, 0, 500, 100, 100, 200); + dewarpaUseBothArrays(dewa, 1); + dew = dewarpCreate(pix2, 0); + dewarpaInsertDewarp(dewa, dew); + dewarpBuildLineModel(dew, 10, "/tmp/dewarp/sud.pdf"); + dewarpaApplyDisparity(dewa, 0, pix1, 255, 0, 0, &pix3, NULL); + dewarpaApplyDisparity(dewa, 0, pix2, 255, 0, 0, &pix4, NULL); + pixDisplay(pix3, 500, 100); + pixDisplay(pix4, 600, 100); + pixDestroy(&pix3); + pixDestroy(&pix4); + dewarpaDestroy(&dewa); + } else { + /* -------------------------------------------------------------------* + * Hack: use dewarpBuildPageModel() twice, first straightening + * the horizontal lines, then rotating the result by 90 degrees + * and doing it again, and finally rotating back by -90 degrees. + * -------------------------------------------------------------------*/ + /* Extract the horizontal lines */ + pix3 = pixMorphSequence(pix2, "d1.3 + c6.1 + o8.1", 0); + pixDisplay(pix3, 600, 100); + + /* Correct for vertical disparity */ + dewa = dewarpaCreate(1, 30, 1, 4, 50); + dewarpaSetCurvatures(dewa, 500, 0, 500, 100, 100, 200); + dewarpaUseBothArrays(dewa, 0); + dew = dewarpCreate(pix3, 0); + dewarpaInsertDewarp(dewa, dew); + dewarpBuildPageModel(dew, "/tmp/dewarp/sud1.pdf"); + dewarpaApplyDisparity(dewa, 0, pix1, 255, 0, 0, &pix4, NULL); + dewarpaApplyDisparity(dewa, 0, pix2, 255, 0, 0, &pix5, NULL); + pixDisplay(pix4, 500, 100); + pixDisplay(pix5, 600, 100); + dewarpaDestroy(&dewa); + + /* Rotate result 90 degrees */ + pix6 = pixRotateOrth(pix4, 1); + pix7 = pixRotateOrth(pix5, 1); /* grid: vertical lines now are horiz */ + + /* Extract the vertical lines (which are now horizontal) */ + pix8 = pixMorphSequence(pix7, "d1.3 + c6.1 + o8.1", 0); + pixDisplay(pix8, 600, 500); + + /* Correct for vertical (now horizontal) disparity */ + dewa = dewarpaCreate(1, 30, 1, 4, 50); + dewarpaSetCurvatures(dewa, 500, 0, 500, 100, 100, 200); + dewarpaUseBothArrays(dewa, 0); + dew = dewarpCreate(pix8, 0); + dewarpaInsertDewarp(dewa, dew); + dewarpBuildPageModel(dew, "/tmp/dewarp/sud2.pdf"); + dewarpaApplyDisparity(dewa, 0, pix6, 255, 0, 0, &pix9, NULL); + dewarpaApplyDisparity(dewa, 0, pix8, 255, 0, 0, &pix10, NULL); + pixd = pixRotateOrth(pix9, 3); + pixDisplay(pix10, 600, 300); + pixDisplay(pixd, 600, 700); + } + + pixDestroy(&pixs); + pixDestroy(&pix1); + pixDestroy(&pix2); + boxaDestroy(&boxa1); + pixaDestroy(&pixa1); + pixaDestroy(&pixa2); + return 0; +} |