152 lines
2.8 KiB
C
152 lines
2.8 KiB
C
/*
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detect.c
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--------
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include "../tthimage.h"
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/*::------------------------------------------------------------------::*/
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/*
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* this function detect all the pixels who the value is
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* over the values of all his 8 neight-machin.
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*/
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int
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Image_detect_tops(Image_Desc *src, Image_Desc *dst, int flags)
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{
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int x, y, foo, top, r, g, b, rm, gm, bm;
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static struct
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{
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int x, y;
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} d[] =
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{
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{ -1, -1 },
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{ 0, -1 },
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{ 1, -1 },
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{ -1, 0 },
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{ 1, 0 },
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{ -1, 1 },
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{ 0, 1 },
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{ 1, 1 }
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};
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if ( (foo=Image_compare_desc(src, dst)) )
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{
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fprintf(stderr, "Detect Tops: erreur: %s\n", Image_err2str(foo));
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return foo;
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}
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Image_clear(dst, 0, 0, 0);
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for (y=1; y<src->height-1; y++)
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{
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for (x=1; x<src->width-1; x++)
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{
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top = 0;
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for (foo=0; foo<8; foo++)
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{
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r = Image_R_pixel(src, x+d[foo].x, y+d[foo].y);
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if (r > top) top = r;
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}
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r = Image_R_pixel(src, x, y);
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if (r > top) rm = 255;
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else rm = 0;
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top = 0;
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for (foo=0; foo<8; foo++)
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{
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g = Image_G_pixel(src, x+d[foo].x, y+d[foo].y);
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if (g > top) top = g;
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}
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g = Image_G_pixel(src, x, y);
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if (g > top) gm = 255;
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else gm = 0;
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top = 0;
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for (foo=0; foo<8; foo++)
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{
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b = Image_B_pixel(src, x+d[foo].x, y+d[foo].y);
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if (b > top) top = b;
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}
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b = Image_B_pixel(src, x, y);
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if (b > top) bm = 255;
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else bm = 0;
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Image_plotRGB(dst, x, y, rm, gm, bm);
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}
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}
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#if DEBUG_LEVEL
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fprintf(stderr, "\tok?\n");
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#endif
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return OLL_KORRECT;
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}
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/*::------------------------------------------------------------------::*/
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/*
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* on cherche les endroits ou le niveau de gris est 'plat'.
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*
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* le parametre 'r1' n'est pas utilise et doit etre mis a 0
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*/
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int
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Image_detect_flat_gray(Image_Desc *src, Image_Desc *dst, int param, int r1)
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{
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int x, y, foo, r, g, b, gris, mini, maxi;
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static struct
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{
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int x, y;
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} d[] =
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{
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{ -1, -1 },
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{ 0, -1 },
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{ 1, -1 },
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{ -1, 0 },
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{ 1, 0 },
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{ -1, 1 },
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{ 0, 1 },
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{ 1, 1 }
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};
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if ( (foo=Image_compare_desc(src, dst)) )
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{
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fprintf(stderr, "Detect Flat Gray: erreur: %s\n", Image_err2str(foo));
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return foo;
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}
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if (0 != r1)
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{
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fprintf(stderr, "%s : ah ah r1 is %d, a bad value\n", __func__, r1);
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}
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for (y=1; y<src->height-1; y++)
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{
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for (x=1; x<src->width-1; x++)
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{
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mini = 999999;
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maxi = -42;
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for (foo=0; foo<8; foo++)
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{
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Image_getRGB(src, x+d[foo].x, y+d[foo].y, &r, &g, &b);
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gris = r + g + b;
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if (gris > maxi) maxi = gris;
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else if (gris < mini) mini = gris;
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}
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if (maxi-mini < param)
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Image_plotRGB(dst, x, y, 255, 255, 255);
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else
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Image_plotRGB(dst, x, y, 0, 0, 0);
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}
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}
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/*
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* hop, en finale, on efface les bords, et on
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* marque l'image "modifiee".
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*/
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(void)Image_raz_sides(dst);
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dst->modified = 1;
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return FUNC_IS_ALPHA;
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}
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/*::------------------------------------------------------------------::*/
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