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Diffstat (limited to 'leptonica/prog/lowsat_reg.c')
| -rw-r--r-- | leptonica/prog/lowsat_reg.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/leptonica/prog/lowsat_reg.c b/leptonica/prog/lowsat_reg.c new file mode 100644 index 00000000..6a01dea6 --- /dev/null +++ b/leptonica/prog/lowsat_reg.c @@ -0,0 +1,107 @@ +/*====================================================================* + - 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. + *====================================================================*/ + +/* + * lowsat_reg.c + * + * Testing functions that identify and modify image pixels that + * have low saturation (i.e., are essentially gray). + */ + +#ifdef HAVE_CONFIG_H +#include <config_auto.h> +#endif /* HAVE_CONFIG_H */ + +#include "allheaders.h" + +int main(int argc, + char **argv) +{ +l_int32 i, j, w, h, wpl, val; +l_uint32 gray32; +l_uint32 *data, *line; +PIX *pix1, *pix2, *pix3, *pix4, *pix5, *pix6, *pix7; +PIXA *pixa; +L_REGPARAMS *rp; + + if (regTestSetup(argc, argv, &rp)) + return 1; + + lept_mkdir("lept/lowsat"); + pixa = pixaCreate(0); + pix1 = pixRead("zier.jpg"); + regTestWritePixAndCheck(rp, pix1, IFF_PNG); /* 0 */ + pixDisplayWithTitle(pix1, 0, 100, NULL, rp->display); + pixaAddPix(pixa, pix1, L_INSERT); + + /* Embed the image in a varying gray background */ + pix2 = pixCreate(400, 580, 32); + data = pixGetData(pix2); + wpl = pixGetWpl(pix2); + for (i = 0; i < 580; i++) { + line = data + i * wpl; + val = 150 + 50 * i / 580; + for (j = 0; j < 400; j++) { + composeRGBPixel(val, val, val, &gray32); + line[j] = gray32; + } + } + pixRasterop(pix2, 70, 90, 270, 400, PIX_SRC, pix1, 0, 0); + regTestWritePixAndCheck(rp, pix2, IFF_PNG); /* 1 */ + pixaAddPix(pixa, pix2, L_COPY); + pixDisplayWithTitle(pix2, 300, 100, NULL, rp->display); + + /* Darken the gray pixels, leaving most of the + * the others unaffected. */ + pix3 = pixDarkenGray(NULL, pix2, 220, 10); + regTestWritePixAndCheck(rp, pix3, IFF_PNG); /* 2 */ + pixaAddPix(pixa, pix3, L_COPY); + pixDisplayWithTitle(pix3, 700, 100, "gray pixels are black", rp->display); + + /* We can also generate a mask over the gray pixels, + * eliminating noise from very dark pixels morphologically. */ + pix4 = pixMaskOverGrayPixels(pix2, 220, 10); + regTestWritePixAndCheck(rp, pix4, IFF_PNG); /* 3 */ + pixaAddPix(pixa, pix4, L_INSERT); + pixDisplayWithTitle(pix4, 1100, 100, "mask over gray pixels", rp->display); + pix5 = pixMorphSequence(pix4, "o20.20", 0); /* remove noise */ + regTestWritePixAndCheck(rp, pix5, IFF_PNG); /* 4 */ + pixaAddPix(pixa, pix5, L_COPY); + pixDisplayWithTitle(pix5, 1500, 100, "clean mask over gray", rp->display); + pixInvert(pix5, pix5); + pix6 = pixConvertTo32(pix5); + pix7 = pixAddRGB(pix2, pix6); + regTestWritePixAndCheck(rp, pix7, IFF_PNG); /* 5 */ + pixaAddPix(pixa, pix7, L_INSERT); + pixDisplayWithTitle(pix7, 1900, 100, NULL, rp->display); + + pixDestroy(&pix2); + pixDestroy(&pix3); + pixDestroy(&pix5); + pixDestroy(&pix6); + pixaDestroy(&pixa); + return regTestCleanup(rp); +} |