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/*====================================================================*
- 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, 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);
}
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