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Diffstat (limited to 'leptonica/prog/lineremoval_reg.c')
| -rw-r--r-- | leptonica/prog/lineremoval_reg.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/leptonica/prog/lineremoval_reg.c b/leptonica/prog/lineremoval_reg.c new file mode 100644 index 00000000..422a24b3 --- /dev/null +++ b/leptonica/prog/lineremoval_reg.c @@ -0,0 +1,124 @@ +/*====================================================================* + - 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. + *====================================================================*/ + +/* + * lineremoval_reg.c + * + * A fun little application, saved as a regression test. + */ + +#ifdef HAVE_CONFIG_H +#include <config_auto.h> +#endif /* HAVE_CONFIG_H */ + +#include "allheaders.h" + +int main(int argc, + char **argv) +{ +l_float32 angle, conf, deg2rad; +PIX *pixs, *pix1, *pix2, *pix3, *pix4, *pix5; +PIX *pix6, *pix7, *pix8, *pix9; +PIXA *pixa; +L_REGPARAMS *rp; + + if (regTestSetup(argc, argv, &rp)) + return 1; + + deg2rad = 3.14159 / 180.; + pixs = pixRead("dave-orig.png"); + pixa = pixaCreate(0); + + /* Threshold to binary, extracting much of the lines */ + pix1 = pixThresholdToBinary(pixs, 170); + regTestWritePixAndCheck(rp, pix1, IFF_PNG); /* 0 */ + pixaAddPix(pixa, pix1, L_INSERT); + + /* Find the skew angle and deskew using an interpolated + * rotator for anti-aliasing (to avoid jaggies) */ + pixFindSkew(pix1, &angle, &conf); + pix2 = pixRotateAMGray(pixs, deg2rad * angle, 255); + regTestWritePixAndCheck(rp, pix2, IFF_PNG); /* 1 */ + pixaAddPix(pixa, pix2, L_INSERT); + + /* Extract the lines to be removed */ + pix3 = pixCloseGray(pix2, 51, 1); + regTestWritePixAndCheck(rp, pix3, IFF_PNG); /* 2 */ + pixaAddPix(pixa, pix3, L_INSERT); + + /* Solidify the lines to be removed */ + pix4 = pixErodeGray(pix3, 1, 5); + regTestWritePixAndCheck(rp, pix4, IFF_PNG); /* 3 */ + pixaAddPix(pixa, pix4, L_INSERT); + + /* Clean the background of those lines */ + pix5 = pixThresholdToValue(NULL, pix4, 210, 255); + regTestWritePixAndCheck(rp, pix5, IFF_PNG); /* 4 */ + pixaAddPix(pixa, pix5, L_INSERT); + + pix6 = pixThresholdToValue(NULL, pix5, 200, 0); + regTestWritePixAndCheck(rp, pix6, IFF_PNG); /* 5 */ + pixaAddPix(pixa, pix6, L_COPY); + + /* Get paint-through mask for changed pixels */ + pix7 = pixThresholdToBinary(pix6, 210); + regTestWritePixAndCheck(rp, pix7, IFF_PNG); /* 6 */ + pixaAddPix(pixa, pix7, L_INSERT); + + /* Add the inverted, cleaned lines to orig. Because + * the background was cleaned, the inversion is 0, + * so when you add, it doesn't lighten those pixels. + * It only lightens (to white) the pixels in the lines! */ + pixInvert(pix6, pix6); + pix8 = pixAddGray(NULL, pix2, pix6); + regTestWritePixAndCheck(rp, pix8, IFF_PNG); /* 7 */ + pixaAddPix(pixa, pix8, L_COPY); + + pix9 = pixOpenGray(pix8, 1, 9); + regTestWritePixAndCheck(rp, pix9, IFF_PNG); /* 8 */ + pixaAddPix(pixa, pix9, L_INSERT); + pixCombineMasked(pix8, pix9, pix7); + regTestWritePixAndCheck(rp, pix8, IFF_PNG); /* 9 */ + pixaAddPix(pixa, pix8, L_INSERT); + + if (rp->display) { + lept_rmdir("lept/lines"); + lept_mkdir("lept/lines"); + lept_stderr("Writing to: /tmp/lept/lines/lineremoval.pdf\n"); + pixaConvertToPdf(pixa, 0, 1.0, L_FLATE_ENCODE, 0, "lineremoval example", + "/tmp/lept/lines/lineremoval.pdf"); + pix1 = pixaDisplayTiledInColumns(pixa, 5, 0.5, 30, 2); + pixWrite("/tmp/lept/lines/lineremoval.jpg", pix1, IFF_JFIF_JPEG); + pixDisplay(pix1, 100, 100); + pixDestroy(&pix1); + } + + pixaDestroy(&pixa); + pixDestroy(&pixs); + pixDestroy(&pix6); + return regTestCleanup(rp); +} + |