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* 8/13/86 |
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*/ |
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#include "standard.h" |
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#include <string.h> |
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#include "color.h" |
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#include "pfilt.h" |
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#define RSCA 1.13 /* square-radius multiplier: sqrt(4/PI) */ |
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short *ringndx; /* ring index table */ |
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float *warr; /* array of pixel weights */ |
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|
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#define lookgauss(x) gausstable[(int)(10.*(x)+.5)] |
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#define lookgauss(x) gausstable[(int)(20.*(x)+.5)] |
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static double pickfilt(double p0); |
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static void sumans(int px, int py, int rcent, int ccent, double m); |
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extern void |
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void |
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initmask(void) /* initialize gaussian lookup table */ |
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{ |
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int gtabsiz; |
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double gaussN; |
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double d; |
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register int x; |
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int x; |
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|
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gtabsiz = 111*CHECKRAD*CHECKRAD; |
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gtabsiz = 444*CHECKRAD*CHECKRAD; |
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gausstable = (float *)malloc(gtabsiz*sizeof(float)); |
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if (gausstable == NULL) |
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goto memerr; |
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d = x_c*y_r*0.25/(rad*rad); |
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gausstable[0] = exp(-d); |
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for (x = 1; x < gtabsiz; x++) |
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if (x*0.1 <= d) |
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if (x*0.05 <= d) |
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gausstable[x] = gausstable[0]; |
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else |
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gausstable[x] = exp(-x*0.1); |
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gausstable[x] = exp(-x*0.05); |
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if (obarsize == 0) |
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return; |
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/* compute integral of filter */ |
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} |
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extern void |
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void |
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dobox( /* simple box filter */ |
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COLOR csum, |
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SCOLOR csum, |
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int xcent, |
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int ycent, |
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int c, |
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int wsum; |
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double d; |
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int y; |
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register int x, offs; |
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register COLOR *scan; |
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int x, offs; |
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COLORV *scan, *scp; |
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|
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wsum = 0; |
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setcolor(csum, 0.0, 0.0, 0.0); |
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scolorblack(csum); |
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for (y = ycent+1-ybrad; y <= ycent+ybrad; y++) { |
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if (y < 0) continue; |
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if (y >= yres) break; |
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if (d < -0.5) continue; |
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if (d >= 0.5) break; |
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wsum++; |
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addcolor(csum, scan[x+offs]); |
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scp = scan + (x+offs)*NCSAMP; |
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saddscolor(csum, scp); |
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} |
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} |
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if (wsum > 1) { |
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d = 1.0/wsum; |
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scalecolor(csum, d); |
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scalescolor(csum, d); |
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} |
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} |
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extern void |
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void |
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dogauss( /* gaussian filter */ |
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COLOR csum, |
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SCOLOR csum, |
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int xcent, |
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int ycent, |
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int c, |
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) |
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{ |
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double dy, dx, weight, wsum; |
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COLOR ctmp; |
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SCOLOR ctmp; |
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int y; |
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register int x, offs; |
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register COLOR *scan; |
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int x, offs; |
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COLORV *scan; |
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wsum = FTINY; |
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setcolor(csum, 0.0, 0.0, 0.0); |
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scolorblack(csum); |
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for (y = ycent-yrad; y <= ycent+yrad; y++) { |
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if (y < 0) continue; |
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if (y >= yres) break; |
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dx = (x_c*(x+.5) - (c+.5))/rad; |
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weight = lookgauss(dx*dx + dy*dy); |
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wsum += weight; |
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copycolor(ctmp, scan[x+offs]); |
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scalecolor(ctmp, weight); |
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addcolor(csum, ctmp); |
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copyscolor(ctmp, scan+(x+offs)*NCSAMP); |
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scalescolor(ctmp, weight); |
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saddscolor(csum, ctmp); |
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} |
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} |
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weight = 1.0/wsum; |
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scalecolor(csum, weight); |
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scalescolor(csum, weight); |
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} |
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extern void |
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void |
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dothresh( /* gaussian threshold filter */ |
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int xcent, |
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int ycent, |
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{ |
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double d; |
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int r, y, offs; |
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register int c, x; |
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register float *gscan; |
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int c, x; |
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float *gscan; |
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/* compute ring sums */ |
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memset((char *)ringsum, '\0', (orad+1)*sizeof(float)); |
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memset((char *)ringwt, '\0', (orad+1)*sizeof(short)); |
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if (d < -0.5) continue; |
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if (d >= 0.5) break; |
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sumans(x, y, rcent, ccent, |
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pickfilt((*ourbright)(scanin[y%barsize][x+offs]))); |
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pickfilt((*ourbright)(scanin[y%barsize]+(x+offs)*NCSAMP))); |
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} |
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} |
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} |
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double t, num, denom, avg, wsum; |
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double mlimit[2]; |
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int ilimit = 4.0/TEPS; |
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register int i; |
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int i; |
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/* iterative search for m */ |
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mlimit[0] = 1.0; mlimit[1] = orad/rad/CHECKRAD; |
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do { |
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) |
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{ |
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double dy2, dx; |
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COLOR pval, ctmp; |
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SCOLOR pval, ctmp; |
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int ksiz, r, offs; |
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double pc, pr, norm; |
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register int i, c; |
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register COLOR *scan; |
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int i, c; |
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COLORV *scan, *scp; |
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/* |
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* This normalization method fails at the picture borders because |
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* a different number of input pixels contribute there. |
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*/ |
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scan = scanin[py%barsize] + (px < 0 ? xres : px >= xres ? -xres : 0); |
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copycolor(pval, scan[px]); |
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scan = scanin[py%barsize] + (px < 0 ? xres : px >= xres ? -xres : 0)*NCSAMP; |
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copyscolor(pval, scan+px*NCSAMP); |
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pc = x_c*(px+.5); |
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pr = y_r*(py+.5); |
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ksiz = CHECKRAD*m*rad + 1; |
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scan = scoutbar[r%obarsize]; |
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for (c = ccent-ksiz; c <= ccent+ksiz; c++) { |
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offs = c < 0 ? ncols : c >= ncols ? -ncols : 0; |
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if (offs && !wrapfilt) |
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if ((offs != 0) & !wrapfilt) |
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continue; |
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copycolor(ctmp, pval); |
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copyscolor(ctmp, pval); |
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dx = norm*warr[i++]; |
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scalecolor(ctmp, dx); |
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addcolor(scan[c+offs], ctmp); |
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scalescolor(ctmp, dx); |
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scp = scan + (c+offs)*NCSAMP; |
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saddscolor(scp, ctmp); |
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} |
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} |
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} |