rankhisto_reg.c

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/*====================================================================*
 -  Copyright (C) 2001 Leptonica.  All rights reserved.
 -  This software is distributed in the hope that it will be
 -  useful, but with NO WARRANTY OF ANY KIND.
 -  No author or distributor accepts responsibility to anyone for the
 -  consequences of using this software, or for whether it serves any
 -  particular purpose or works at all, unless he or she says so in
 -  writing.  Everyone is granted permission to copy, modify and
 -  redistribute this source code, for commercial or non-commercial
 -  purposes, with the following restrictions: (1) the origin of this
 -  source code must not be misrepresented; (2) modified versions must
 -  be plainly marked as such; and (3) this notice may not be removed
 -  or altered from any source or modified source distribution.
 *====================================================================*/

/*
 * rankhisto_reg.c
 *
 *   Tests grayscale rank functions:
 *      (1) pixGetRankColorArray()
 *      (2) numaDiscretizeRankAndIntensity()
 */

#include <math.h>
#ifndef  _WIN32
#include <unistd.h>
#else
#include <windows.h>   /* for Sleep() */
#endif  /* _WIN32 */
#include "allheaders.h"

static PIXA *PixSavePlots1(void);
static PIXA *PixSavePlots2(void);

main(int    argc,
     char **argv)
{
char          fname[256];
l_int32       i, w, h, nbins, factor;
l_int32       spike;
l_uint32     *array, *marray;
NUMA         *na, *nan, *nai, *narbin;
PIX          *pixs, *pixt, *pixd;
PIXA         *pixa;
L_REGPARAMS  *rp;

    if (regTestSetup(argc, argv, &rp))
        return 1;

        /* Find the rank bin colors */
    pixs = pixRead("map1.jpg");
    pixGetDimensions(pixs, &w, &h, NULL);
    factor = L_MAX(1, (l_int32)sqrt((l_float64)(w * h / 20000.0)));
    nbins = 10;
    pixGetRankColorArray(pixs, nbins, L_SELECT_MIN, factor, &array, 2);
    if (!array)
        return ERROR_INT("\n\n\nFAILURE!\n\n\n", rp->testname, 1);
    for (i = 0; i < nbins; i++)
        fprintf(stderr, "%d: %x\n", i, array[i]);
    pixd = pixDisplayColorArray(array, nbins, 200, 5, 1);
    pixWrite("/tmp/rankhisto.0.png", pixd, IFF_PNG);
    regTestCheckFile(rp, "/tmp/rankhisto.0.png");  /* 0 */
    pixDisplayWithTitle(pixd, 100, 100, NULL, rp->display);
    pixDestroy(&pixd);

        /* Modify the rank bin colors by mapping them such
         * that the lightest color is mapped to white */
    marray = (l_uint32 *)lept_calloc(nbins, sizeof(l_uint32));
    for (i = 0; i < nbins; i++)
        pixelLinearMapToTargetColor(array[i], array[nbins - 1],
                                    0xffffff00, &marray[i]);
    pixd = pixDisplayColorArray(marray, nbins, 200, 5, 1);
    pixWrite("/tmp/rankhisto.1.png", pixd, IFF_PNG);
    regTestCheckFile(rp, "/tmp/rankhisto.1.png");  /* 1 */
    pixDisplayWithTitle(pixd, 100, 600, NULL, rp->display);
    pixDestroy(&pixd);
    lept_free(marray);

        /* Save the histogram plots */
#ifndef  _WIN32
    sleep(2);  /* give gnuplot time to write out the files */
#else
    Sleep(2000);
#endif  /* _WIN32 */
    pixa = PixSavePlots1();
    pixd = pixaDisplay(pixa, 0, 0);
    pixWrite("/tmp/rankhisto.2.png", pixd, IFF_PNG);
    regTestCheckFile(rp, "/tmp/rankhisto.2.png");  /* 2 */
    pixDisplayWithTitle(pixd, 100, 600, NULL, rp->display);
    pixaDestroy(&pixa);
    pixDestroy(&pixd);

        /* Map to the lightest bin; then do TRC adjustment */
    pixt = pixLinearMapToTargetColor(NULL, pixs, array[nbins - 1], 0xffffff00);
    pixd = pixGammaTRC(NULL, pixt, 1.0, 0, 240);
    pixWrite("/tmp/rankhisto.3.png", pixd, IFF_PNG);
    regTestCheckFile(rp, "/tmp/rankhisto.3.png");  /* 3 */
    pixDisplayWithTitle(pixd, 600, 100, NULL, rp->display);
    pixDestroy(&pixt);
    pixDestroy(&pixd);

        /* Now test the edge cases for the histogram and rank LUT,
         * where all the histo data is piled up at one place. 
         * We only require that the result be sensible. */
    for (i = 0; i < 3; i++) {
        if (i == 0)
            spike = 0;
        else if (i == 1)
            spike = 50;
        else
            spike = 99;
        na = numaMakeConstant(0, 100);
        numaReplaceNumber(na, spike, 200.0);
        nan = numaNormalizeHistogram(na, 1.0);
        numaDiscretizeRankAndIntensity(nan, 10, &narbin, &nai, NULL, NULL);
        snprintf(fname, sizeof(fname), "/tmp/rtnan%d", i + 1);
        gplotSimple1(nan, GPLOT_PNG, fname, "Normalized Histogram");
        snprintf(fname, sizeof(fname), "/tmp/rtnai%d", i + 1);
        gplotSimple1(nai, GPLOT_PNG, fname, "Intensity vs. rank bin");
        snprintf(fname, sizeof(fname), "/tmp/rtnarbin%d", i + 1);
        gplotSimple1(narbin, GPLOT_PNG, fname, "LUT: rank bin vs. Intensity");
        numaDestroy(&na);
        numaDestroy(&nan);
        numaDestroy(&narbin);
        numaDestroy(&nai);
    }
#ifndef  _WIN32
    sleep(2);  /* give gnuplot time to write out the files */
#else
    Sleep(2000);
#endif  /* _WIN32 */
    pixa = PixSavePlots2();
    pixd = pixaDisplay(pixa, 0, 0);
    pixWrite("/tmp/rankhisto.4.png", pixd, IFF_PNG);
    regTestCheckFile(rp, "/tmp/rankhisto.4.png");  /* 4 */
    pixDisplayWithTitle(pixd, 500, 600, NULL, rp->display);
    pixaDestroy(&pixa);
    pixDestroy(&pixd);

    pixDestroy(&pixs);
    lept_free(array);
    regTestCleanup(rp);
    return 0;
}


static PIXA *
PixSavePlots1(void)
{
PIX    *pixt;
PIXA   *pixa;

    pixa = pixaCreate(8);
    pixt = pixRead("/tmp/rtnan.png");
    pixSaveTiled(pixt, pixa, 1, 1, 20, 8);
    pixDestroy(&pixt);
    pixt = pixRead("/tmp/rtnar.png");
    pixSaveTiled(pixt, pixa, 1, 0, 20, 8);
    pixDestroy(&pixt);
    pixt = pixRead("/tmp/rtnai.png");
    pixSaveTiled(pixt, pixa, 1, 0, 20, 8);
    pixDestroy(&pixt);
    pixt = pixRead("/tmp/rtnarbin.png");
    pixSaveTiled(pixt, pixa, 1, 1, 20, 8);
    pixDestroy(&pixt);
    pixt = pixRead("/tmp/rtnabb.png");
    pixSaveTiled(pixt, pixa, 1, 0, 20, 8);
    pixDestroy(&pixt);
    pixt = pixRead("/tmp/rtnared.png");
    pixSaveTiled(pixt, pixa, 1, 1, 20, 8);
    pixDestroy(&pixt);
    pixt = pixRead("/tmp/rtnagreen.png");
    pixSaveTiled(pixt, pixa, 1, 0, 20, 8);
    pixDestroy(&pixt);
    pixt = pixRead("/tmp/rtnablue.png");
    pixSaveTiled(pixt, pixa, 1, 0, 20, 8);
    pixDestroy(&pixt);
    return pixa;
}


static PIXA *
PixSavePlots2(void)
{
PIX    *pixt;
PIXA   *pixa;

    pixa = pixaCreate(9);
    pixt = pixRead("/tmp/rtnan1.png");
    pixSaveTiled(pixt, pixa, 1, 1, 20, 8);
    pixDestroy(&pixt);
    pixt = pixRead("/tmp/rtnai1.png");
    pixSaveTiled(pixt, pixa, 1, 0, 20, 8);
    pixDestroy(&pixt);
    pixt = pixRead("/tmp/rtnarbin1.png");
    pixSaveTiled(pixt, pixa, 1, 0, 20, 8);
    pixDestroy(&pixt);
    pixt = pixRead("/tmp/rtnan2.png");
    pixSaveTiled(pixt, pixa, 1, 1, 20, 8);
    pixDestroy(&pixt);
    pixt = pixRead("/tmp/rtnai2.png");
    pixSaveTiled(pixt, pixa, 1, 0, 20, 8);
    pixDestroy(&pixt);
    pixt = pixRead("/tmp/rtnarbin2.png");
    pixSaveTiled(pixt, pixa, 1, 0, 20, 8);
    pixDestroy(&pixt);
    pixt = pixRead("/tmp/rtnan3.png");
    pixSaveTiled(pixt, pixa, 1, 1, 20, 8);
    pixDestroy(&pixt);
    pixt = pixRead("/tmp/rtnai3.png");
    pixSaveTiled(pixt, pixa, 1, 0, 20, 8);
    pixDestroy(&pixt);
    pixt = pixRead("/tmp/rtnarbin3.png");
    pixSaveTiled(pixt, pixa, 1, 0, 20, 8);
    pixDestroy(&pixt);
    return pixa;
}