pta_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.
 *====================================================================*/

/*
 *  pta_reg.c
 *
 *  This tests several ptaa functions, including:
 *     -  ptaaGetBoundaryPixels()
 *     -  pixRenderRandomCmapPtaa()
 */

#include <stdio.h>
#include <stdlib.h>
#include "allheaders.h"


main(int    argc,
     char **argv)
{
l_int32      i, n, nbox, npta, fgcount, bgcount, count, same, ok;
BOXA        *boxa;
PIX         *pixs, *pixfg, *pixbg, *pixc, *pixb, *pixd;
PIXA        *pixa;
PTA         *pta;
PTAA        *ptaafg, *ptaabg;
static char  mainName[] = "pta_reg.c";

    ok = TRUE;
    pixs = pixRead("feyn-fract.tif");
    boxa = pixConnComp(pixs, NULL, 8);
    nbox = boxaGetCount(boxa);
    if (nbox != 464) ok = FALSE;
    fprintf(stderr, "Num boxes = %d\n", nbox);

        /* Get fg and bg boundary pixels */
    pixfg = pixMorphSequence(pixs, "e3.3", 0);
    pixXor(pixfg, pixfg, pixs);
    pixCountPixels(pixfg, &fgcount, NULL);
    if (fgcount == 58764)
        fprintf(stderr, "num fg pixels = %d\n", fgcount);
    else {
        ok = FALSE;
        fprintf(stderr, "Error: num fg pixels = %d\n", fgcount);
    }

    pixbg = pixMorphSequence(pixs, "d3.3", 0);
    pixXor(pixbg, pixbg, pixs);
    pixCountPixels(pixbg, &bgcount, NULL);
    if (bgcount == 60335)
        fprintf(stderr, "num bg pixels = %d\n", bgcount);
    else {
        ok = FALSE;
        fprintf(stderr, "Error: num bg pixels = %d\n", bgcount);
    }

        /* Get ptaa of fg pixels */
    ptaafg = ptaaGetBoundaryPixels(pixs, L_BOUNDARY_FG, 8, NULL, NULL); 
    ptaaWrite("/tmp/junkfg.ptaa", ptaafg, 1);
    npta = ptaaGetCount(ptaafg);
    if (npta != nbox) {
        ok = FALSE;
        fprintf(stderr, "Error: ptaa count = %d, boxa count = %d\n",
                npta, nbox);
    }
    count = 0;
    for (i = 0; i < npta; i++) {
        pta = ptaaGetPta(ptaafg, i, L_CLONE);
        count += ptaGetCount(pta);
        ptaDestroy(&pta);
    }
    fprintf(stderr, "num fg pts = %d\n", count);
    if (fgcount != count) {
        ok = FALSE;
        fprintf(stderr, "Error: npix = %d, num fg pts = %d\n", fgcount, count);
    }

        /* Get ptaa of bg pixels.  Note that the number of bg pts
         * is, in general, larger than the number of bg boundary pixels,
         * because bg boundary pixels are shared by two c.c. that
         * are 1 pixel apart. */
    ptaabg = ptaaGetBoundaryPixels(pixs, L_BOUNDARY_BG, 8, NULL, NULL); 
    ptaaWrite("/tmp/junkbg.ptaa", ptaabg, 1);
    npta = ptaaGetCount(ptaabg);
    if (npta != nbox) {
        ok = FALSE;
        fprintf(stderr, "Error: ptaa count = %d, boxa count = %d\n",
                npta, nbox);
    }
    count = 0;
    for (i = 0; i < npta; i++) {
        pta = ptaaGetPta(ptaabg, i, L_CLONE);
        count += ptaGetCount(pta);
        ptaDestroy(&pta);
    }
    fprintf(stderr, "num bg pts = %d\n", count);
    if (count != 60602) {
        fprintf(stderr, "Error: npix = %d, num bg pts = %d\n", bgcount, count);
        ok = FALSE;
    }

        /* Render the fg boundary pixels on top of pixs. */
    pixa = pixaCreate(4);
    pixc = pixRenderRandomCmapPtaa(pixs, ptaafg, 0, 0, 0);
    pixSaveTiled(pixc, pixa, 1, 1, 30, 32);
    pixDestroy(&pixc);

        /* Render the bg boundary pixels on top of pixs. */
    pixc = pixRenderRandomCmapPtaa(pixs, ptaabg, 0, 0, 0);
    pixSaveTiled(pixc, pixa, 1, 0, 30, 32);
    pixDestroy(&pixc);

    pixClearAll(pixs);

        /* Render the fg boundary pixels alone. */
    pixc = pixRenderRandomCmapPtaa(pixs, ptaafg, 0, 0, 0);
    pixSaveTiled(pixc, pixa, 1, 1, 30, 32);

        /* Verify that the fg pixels are the same set as we
         * originally started with. */
    pixb = pixConvertTo1(pixc, 255);
    pixEqual(pixb, pixfg, &same);
    if (!same) {
        fprintf(stderr, "Fg pixel set not correct\n");
        ok = FALSE;
    }
    pixDestroy(&pixc);
    pixDestroy(&pixb);

        /* Render the fg boundary pixels alone. */
    pixc = pixRenderRandomCmapPtaa(pixs, ptaabg, 0, 0, 0);
    pixSaveTiled(pixc, pixa, 1, 0, 30, 32);

        /* Verify that the bg pixels are the same set as we
         * originally started with. */
    pixb = pixConvertTo1(pixc, 255);
    pixEqual(pixb, pixbg, &same);
    if (!same) {
        fprintf(stderr, "Bg pixel set not correct\n");
        ok = FALSE;
    }
    pixDestroy(&pixc);
    pixDestroy(&pixb);

    if (ok)
        fprintf(stderr, "OK!\n");
    else
        fprintf(stderr, "Error!\n");

    pixd = pixaDisplay(pixa, 0, 0);
    pixWrite("/tmp/junkboundary.png", pixd, IFF_PNG);
    pixDisplay(pixd, 0, 0);

    ptaaDestroy(&ptaafg);
    ptaaDestroy(&ptaabg);
    pixDestroy(&pixs);
    pixDestroy(&pixfg);
    pixDestroy(&pixbg);
    pixDestroy(&pixd);
    pixaDestroy(&pixa);
    boxaDestroy(&boxa);

    return 0;
}