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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* pf3.c - routines for gaussian and box filtering |
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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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#define TEPS 0.2 /* threshold proximity goal */ |
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#define REPS 0.1 /* radius proximity goal */ |
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extern double CHECKRAD; /* radius over which gaussian is summed */ |
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extern double rad; /* output pixel radius for filtering */ |
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extern double thresh; /* maximum contribution for subpixel */ |
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extern int nrows; /* number of rows for output */ |
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extern int ncols; /* number of columns for output */ |
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extern int xres, yres; /* resolution of input */ |
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extern double x_c, y_r; /* conversion factors */ |
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extern int xrad; /* x search radius */ |
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extern int yrad; /* y search radius */ |
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extern int xbrad; /* x box size */ |
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extern int ybrad; /* y box size */ |
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extern int barsize; /* size of input scan bar */ |
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extern COLOR **scanin; /* input scan bar */ |
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extern COLOR *scanout; /* output scan line */ |
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extern COLOR **scoutbar; /* output scan bar (if thresh > 0) */ |
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extern float **greybar; /* grey-averaged input values */ |
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extern int obarsize; /* size of output scan bar */ |
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extern int orad; /* output window radius */ |
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extern int wrapfilt; /* wrap filter horizontally? */ |
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extern char *progname; |
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float *gausstable; /* gauss lookup table */ |
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float *ringsum; /* sum of ring values */ |
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short *ringndx; /* ring index table */ |
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float *warr; /* array of pixel weights */ |
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extern double (*ourbright)(); /* brightness computation function */ |
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#define lookgauss(x) gausstable[(int)(20.*(x)+.5)] |
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double pickfilt(); |
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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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#define lookgauss(x) gausstable[(int)(10.*(x)+.5)] |
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initmask() /* initialize gaussian lookup table */ |
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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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gtabsiz = 111*CHECKRAD*CHECKRAD/(rad*rad); |
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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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ringsum = (float *)malloc((orad+1)*sizeof(float)); |
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ringwt = (short *)malloc((orad+1)*sizeof(short)); |
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warr = (float *)malloc(obarsize*obarsize*sizeof(float)); |
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if (ringsum == NULL | ringwt == 0 | warr == NULL) |
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if ((ringsum == NULL) | (ringwt == 0) | (warr == NULL)) |
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goto memerr; |
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return; |
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memerr: |
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} |
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dobox(csum, xcent, ycent, c, r) /* simple box filter */ |
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COLOR csum; |
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int xcent, ycent; |
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int c, r; |
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void |
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dobox( /* simple box filter */ |
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COLOR csum, |
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int xcent, |
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int ycent, |
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int c, |
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int r |
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) |
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{ |
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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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COLOR *scan; |
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wsum = 0; |
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setcolor(csum, 0.0, 0.0, 0.0); |
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} |
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dogauss(csum, xcent, ycent, c, r) /* gaussian filter */ |
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COLOR csum; |
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int xcent, ycent; |
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int c, r; |
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void |
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dogauss( /* gaussian filter */ |
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COLOR csum, |
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int xcent, |
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int ycent, |
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int c, |
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int r |
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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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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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COLOR *scan; |
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wsum = FTINY; |
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setcolor(csum, 0.0, 0.0, 0.0); |
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} |
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dothresh(xcent, ycent, ccent, rcent) /* gaussian threshold filter */ |
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int xcent, ycent; |
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int ccent, rcent; |
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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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int ccent, |
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int rcent |
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) |
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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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bzero((char *)ringsum, (orad+1)*sizeof(float)); |
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bzero((char *)ringwt, (orad+1)*sizeof(short)); |
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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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for (r = -orad; r <= orad; r++) { |
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if (rcent+r < 0) continue; |
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if (rcent+r >= nrows) break; |
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} |
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double |
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pickfilt(p0) /* find filter multiplier for p0 */ |
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double p0; |
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static double |
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pickfilt( /* find filter multiplier for p0 */ |
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double p0 |
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) |
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{ |
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double m = 1.0; |
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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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sumans(px, py, rcent, ccent, m) /* sum input pixel to output */ |
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int px, py; |
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int rcent, ccent; |
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double m; |
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static void |
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sumans( /* sum input pixel to output */ |
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int px, |
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int py, |
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int rcent, |
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int ccent, |
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double m |
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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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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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COLOR *scan; |
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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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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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dx = norm*warr[i++]; |
