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/* Copyright (c) 1996 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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|
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/* |
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* Routines for computing and applying brightness mapping. |
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*/ |
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#include <string.h> |
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#include "pcond.h" |
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#define CVRATIO 0.025 /* fraction of pixels allowed > env. */ |
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#define CVRATIO 0.025 /* fraction of samples allowed > env. */ |
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|
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#define exp10(x) exp(2.302585093*(x)) |
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#define LN_10 2.30258509299404568402 |
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#define exp10(x) exp(LN_10*(x)) |
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|
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int modhist[HISTRES]; /* modified histogram */ |
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float cumf[HISTRES+1]; /* cumulative distribution function */ |
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double modhist[HISTRES]; /* modified histogram */ |
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double mhistot; /* modified histogram total */ |
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double cumf[HISTRES+1]; /* cumulative distribution function */ |
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|
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|
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getfixations(fp) /* load fixation history list */ |
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FILE *fp; |
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{ |
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#define FIXHUNK 128 |
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RESOLU fvres; |
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int pos[2]; |
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register int px, py, i; |
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/* initialize our resolution struct */ |
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if ((fvres.rt=inpres.rt)&YMAJOR) { |
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fvres.xr = fvxr; |
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fvres.yr = fvyr; |
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} else { |
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fvres.xr = fvyr; |
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fvres.yr = fvxr; |
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} |
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/* read each picture position */ |
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while (fscanf(fp, "%d %d", &pos[0], &pos[1]) == 2) { |
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/* convert to closest index in foveal image */ |
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loc2pix(pos, &fvres, |
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(pos[0]+.5)/inpres.xr, (pos[1]+.5)/inpres.yr); |
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/* include nine neighborhood samples */ |
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for (px = pos[0]-1; px <= pos[0]+1; px++) { |
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if (px < 0 || px >= fvxr) |
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continue; |
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for (py = pos[1]-1; py <= pos[1]+1; py++) { |
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if (py < 0 || py >= fvyr) |
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continue; |
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for (i = nfixations; i-- > 0; ) |
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if (fixlst[i][0] == px && |
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fixlst[i][1] == py) |
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break; |
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if (i >= 0) |
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continue; /* already there */ |
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if (nfixations % FIXHUNK == 0) { |
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if (nfixations) |
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fixlst = (short (*)[2]) |
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realloc((void *)fixlst, |
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(nfixations+FIXHUNK)* |
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2*sizeof(short)); |
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else |
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fixlst = (short (*)[2])malloc( |
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FIXHUNK*2*sizeof(short) |
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); |
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if (fixlst == NULL) |
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syserror("malloc"); |
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} |
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fixlst[nfixations][0] = px; |
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fixlst[nfixations][1] = py; |
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nfixations++; |
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} |
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} |
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} |
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if (!feof(fp)) { |
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fprintf(stderr, "%s: format error reading fixation data\n", |
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progname); |
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exit(1); |
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} |
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#undef FIXHUNK |
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} |
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|
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|
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gethisto(fp) /* load precomputed luminance histogram */ |
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FILE *fp; |
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{ |
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double histo[MAXPREHIST]; |
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double histart, histep; |
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double l, b, lastb, w; |
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int n; |
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register int i; |
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/* load data */ |
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for (i = 0; i < MAXPREHIST && |
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fscanf(fp, "%lf %lf", &b, &histo[i]) == 2; i++) { |
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if (i > 1 && fabs(b - lastb - histep) > .001) { |
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fprintf(stderr, |
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"%s: uneven step size in histogram data\n", |
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progname); |
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exit(1); |
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} |
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if (i == 1) |
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if ((histep = b - (histart = lastb)) <= FTINY) { |
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fprintf(stderr, |
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"%s: illegal step in histogram data\n", |
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progname); |
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exit(1); |
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} |
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lastb = b; |
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} |
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if (i < 2 || !feof(fp)) { |
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fprintf(stderr, |
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"%s: format/length error loading histogram (log10L %f at %d)\n", |
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progname, b, i); |
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exit(1); |
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} |
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n = i; |
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histart *= LN_10; |
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histep *= LN_10; |
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/* find extrema */ |
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for (i = 0; i < n && histo[i] <= FTINY; i++) |
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; |
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bwmin = histart + (i-.001)*histep; |
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for (i = n; i-- && histo[i] <= FTINY; ) |
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; |
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bwmax = histart + (i+1.001)*histep; |
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if (bwmax > Bl(LMAX)) |
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bwmax = Bl(LMAX); |
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if (bwmin < Bl(LMIN)) |
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bwmin = Bl(LMIN); |
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else /* duplicate bottom bin */ |
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bwmin = bwmax - (bwmax-bwmin)*HISTRES/(HISTRES-1); |
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/* convert histogram */ |
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bwavg = 0.; histot = 0.; |
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for (i = 0; i < HISTRES; i++) |
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bwhist[i] = 0.; |
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for (i = 0, b = histart; i < n; i++, b += histep) { |
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if (b < bwmin+FTINY) continue; |
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if (b >= bwmax-FTINY) break; |
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w = histo[i]; |
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bwavg += w*b; |
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bwhist[bwhi(b)] += w; |
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histot += w; |
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} |
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bwavg /= histot; |
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if (bwmin > Bl(LMIN)+FTINY) { /* add false samples at bottom */ |
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bwhist[1] *= 0.5; |
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bwhist[0] += bwhist[1]; |
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} |
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} |
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|
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|
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double |
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centprob(x, y) /* center-weighting probability function */ |
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int x, y; |
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{ |
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double xr, yr, p; |
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/* paraboloid, 0 at 90 degrees from center */ |
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xr = (x - .5*(fvxr-1))/90.; /* 180 degree fisheye has fv?r == 90 */ |
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yr = (y - .5*(fvyr-1))/90.; |
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p = 1. - xr*xr - yr*yr; |
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return(p < 0. ? 0. : p); |
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} |
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|
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|
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comphist() /* create foveal sampling histogram */ |
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{ |
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double l, b, w, lwmin, lwmax; |
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register int x, y; |
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/* check for precalculated histogram */ |
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if (what2do&DO_PREHIST) |
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return; |
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lwmin = 1e10; /* find extrema */ |
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lwmax = 0.; |
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for (y = 0; y < fvyr; y++) |
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for (x = 0; x < fvxr; x++) { |
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l = plum(fovscan(y)[x]); |
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if (l < lwmin) lwmin = l; |
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if (l > lwmax) lwmax = l; |
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} |
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lwmax *= 1.01; |
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if (lwmax > LMAX) |
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lwmax = LMAX; |
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bwmax = Bl(lwmax); |
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if (lwmin < LMIN) { |
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lwmin = LMIN; |
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bwmin = Bl(LMIN); |
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} else { /* duplicate bottom bin */ |
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bwmin = bwmax - (bwmax-Bl(lwmin))*HISTRES/(HISTRES-1); |
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lwmin = Lb(bwmin); |
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} |
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/* (re)compute histogram */ |
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bwavg = 0.; |
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histot = 0.; |
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for (x = 0; x < HISTRES; x++) |
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bwhist[x] = 0.; |
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/* global average */ |
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if (!(what2do&DO_FIXHIST) || fixfrac < 1.-FTINY) |
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for (y = 0; y < fvyr; y++) |
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for (x = 0; x < fvxr; x++) { |
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l = plum(fovscan(y)[x]); |
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if (l < lwmin+FTINY) continue; |
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if (l >= lwmax-FTINY) continue; |
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b = Bl(l); |
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w = what2do&DO_CWEIGHT ? centprob(x,y) : 1.; |
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bwavg += w*b; |
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bwhist[bwhi(b)] += w; |
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histot += w; |
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} |
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/* average fixation points */ |
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if (what2do&DO_FIXHIST && nfixations > 0) { |
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if (histot > FTINY) |
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w = fixfrac/(1.-fixfrac)*histot/nfixations; |
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else |
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w = 1.; |
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for (x = 0; x < nfixations; x++) { |
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l = plum(fovscan(fixlst[x][1])[fixlst[x][0]]); |
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if (l < lwmin+FTINY) continue; |
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if (l >= lwmax-FTINY) continue; |
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b = Bl(l); |
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bwavg += w*b; |
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bwhist[bwhi(b)] += w; |
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histot += w; |
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} |
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} |
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bwavg /= histot; |
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if (lwmin > LMIN+FTINY) { /* add false samples at bottom */ |
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bwhist[1] *= 0.5; |
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bwhist[0] += bwhist[1]; |
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} |
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} |
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|
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|
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mkcumf() /* make cumulative distribution function */ |
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{ |
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register int i; |
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register long sum; |
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register double sum; |
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|
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< |
cumf[0] = 0.; |
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sum = modhist[0]; |
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for (i = 1; i < HISTRES; i++) { |
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cumf[i] = (double)sum/histot; |
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mhistot = 0.; /* compute modified total */ |
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for (i = 0; i < HISTRES; i++) |
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mhistot += modhist[i]; |
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|
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sum = 0.; /* compute cumulative function */ |
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for (i = 0; i < HISTRES; i++) { |
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cumf[i] = sum/mhistot; |
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sum += modhist[i]; |
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} |
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cumf[HISTRES] = 1.; |
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double |
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clampf(Lw) /* derivative clamping function */ |
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clampf(Lw) /* histogram clamping function */ |
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double Lw; |
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{ |
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double bLw, ratio; |
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return(ratio/(Lb1(bLw)*(Bldmax-Bldmin)*Bl1(Lw))); |
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} |
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|
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double |
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crfactor(Lw) /* contrast reduction factor */ |
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double Lw; |
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{ |
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int i = HISTRES*(Bl(Lw) - bwmin)/(bwmax - bwmin); |
316 |
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double bLw, ratio, Tdb; |
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|
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int |
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shiftdir(bw) /* compute shift direction for histogram */ |
320 |
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double bw; |
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if (i <= 0) |
319 |
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return(1.0); |
320 |
> |
if (i >= HISTRES) |
321 |
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return(1.0); |
322 |
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bLw = BLw(Lw); |
323 |
> |
ratio = what2do&DO_HSENS ? htcontrs(Lb(bLw))/htcontrs(Lw) : Lb(bLw)/Lw; |
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Tdb = mhistot * (bwmax - bwmin) / HISTRES; |
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return(modhist[i]*Lb1(bLw)*(Bldmax-Bldmin)*Bl1(Lw)/(Tdb*ratio)); |
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} |
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|
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|
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> |
#if ADJ_VEIL |
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mkcrfimage() /* compute contrast reduction factor image */ |
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{ |
332 |
< |
if (what2do&DO_HSENS && cf(bw) - (bw - bwmin)/(Bldmax - bwmin)) |
333 |
< |
return(1); |
334 |
< |
return(-1); |
332 |
> |
int i; |
333 |
> |
float *crfptr; |
334 |
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COLOR *fovptr; |
335 |
> |
|
336 |
> |
if (crfimg == NULL) |
337 |
> |
crfimg = (float *)malloc(fvxr*fvyr*sizeof(float)); |
338 |
> |
if (crfimg == NULL) |
339 |
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syserror("malloc"); |
340 |
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crfptr = crfimg; |
341 |
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fovptr = fovimg; |
342 |
> |
for (i = fvxr*fvyr; i--; crfptr++, fovptr++) |
343 |
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crfptr[0] = crfactor(plum(fovptr[0])); |
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} |
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#endif |
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|
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|
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int |
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mkbrmap() /* make dynamic range map */ |
350 |
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{ |
351 |
< |
int hdiffs[HISTRES], above, below; |
352 |
< |
double T, b, s; |
113 |
< |
int maxd, maxi, sd; |
351 |
> |
double Tdb, b, s; |
352 |
> |
double ceiling, trimmings; |
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register int i; |
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/* copy initial histogram */ |
355 |
< |
for (i = 0; i < HISTRES; i++) |
356 |
< |
modhist[i] = bwhist[i]; |
118 |
< |
T = histot * (bwmax - bwmin) / HISTRES; |
119 |
< |
s = (bwmax - bwmin)/HISTRES; |
355 |
> |
memcpy((void *)modhist, (void *)bwhist, sizeof(modhist)); |
356 |
> |
s = (bwmax - bwmin)/HISTRES; /* s is delta b */ |
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/* loop until satisfactory */ |
358 |
< |
for ( ; ; ) { |
359 |
< |
mkcumf(); /* sync brightness mapping */ |
360 |
< |
above = below = 0; /* compute visibility overflow */ |
358 |
> |
do { |
359 |
> |
mkcumf(); /* sync brightness mapping */ |
360 |
> |
if (mhistot <= histot*CVRATIO) |
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> |
return(-1); /* no compression needed! */ |
362 |
> |
Tdb = mhistot * s; |
363 |
> |
trimmings = 0.; /* clip to envelope */ |
364 |
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for (i = 0, b = bwmin + .5*s; i < HISTRES; i++, b += s) { |
365 |
< |
hdiffs[i] = modhist[i] - (int)(T*clampf(Lb(b)) + .5); |
366 |
< |
if (hdiffs[i] > 0) above += hdiffs[i]; |
367 |
< |
else below -= hdiffs[i]; |
365 |
> |
ceiling = Tdb*clampf(Lb(b)); |
366 |
> |
if (modhist[i] > ceiling) { |
367 |
> |
trimmings += modhist[i] - ceiling; |
368 |
> |
modhist[i] = ceiling; |
369 |
> |
} |
370 |
|
} |
371 |
< |
if (above <= histot*CVRATIO) |
372 |
< |
break; /* close enough */ |
373 |
< |
if (above-below >= 0) |
374 |
< |
return(-1); /* Houston, we have a problem.... */ |
375 |
< |
/* original looped here as well (BEGIN_L2) */ |
376 |
< |
maxd = 0; /* find largest overvis */ |
377 |
< |
for (i = 0; i < HISTRES; i++) |
136 |
< |
if (hdiffs[i] > maxd) |
137 |
< |
maxd = hdiffs[maxi=i]; |
138 |
< |
/* broke loop here when (maxd == 0) (BREAK_L2) */ |
139 |
< |
for (sd = shiftdir((maxi+.5)/HISTRES*(bwmax-bwmin)+bwmin); |
140 |
< |
hdiffs[maxi] == maxd; sd = -sd) |
141 |
< |
for (i = maxi+sd; i >= 0 & i < HISTRES; i += sd) |
142 |
< |
if (hdiffs[i] < 0) { |
143 |
< |
if (hdiffs[i] <= -maxd) { |
144 |
< |
modhist[i] += maxd; |
145 |
< |
modhist[maxi] -= maxd; |
146 |
< |
hdiffs[i] += maxd; |
147 |
< |
hdiffs[maxi] = 0; |
148 |
< |
} else { |
149 |
< |
modhist[maxi] += hdiffs[i]; |
150 |
< |
modhist[i] -= hdiffs[i]; |
151 |
< |
hdiffs[maxi] += hdiffs[i]; |
152 |
< |
hdiffs[i] = 0; |
153 |
< |
} |
154 |
< |
break; |
155 |
< |
} |
156 |
< |
/* (END_L2) */ |
157 |
< |
} |
158 |
< |
return(0); |
371 |
> |
} while (trimmings > histot*CVRATIO); |
372 |
> |
|
373 |
> |
#if ADJ_VEIL |
374 |
> |
mkcrfimage(); /* contrast reduction image */ |
375 |
> |
#endif |
376 |
> |
|
377 |
> |
return(0); /* we got it */ |
378 |
|
} |
379 |
|
|
380 |
|
|
414 |
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int xres; |
415 |
|
{ |
416 |
|
double mult, Lw, b; |
417 |
< |
register int i; |
417 |
> |
register int x; |
418 |
|
|
419 |
< |
for (i = 0; i < xres; i++) { |
420 |
< |
Lw = plum(scan[i]); |
419 |
> |
for (x = 0; x < xres; x++) { |
420 |
> |
Lw = plum(scan[x]); |
421 |
|
if (Lw < LMIN) { |
422 |
< |
setcolor(scan[i], 0., 0., 0.); |
422 |
> |
setcolor(scan[x], 0., 0., 0.); |
423 |
|
continue; |
424 |
|
} |
425 |
< |
b = BLw(Lw); |
426 |
< |
mult = (Lb(b) - ldmin)/(ldmax - ldmin) / (Lw*inpexp); |
425 |
> |
b = BLw(Lw); /* apply brightness mapping */ |
426 |
> |
mult = (Lb(b) - ldmin)/(ldmax - ldmin)/(Lw*inpexp); |
427 |
|
if (lumf == rgblum) mult *= WHTEFFICACY; |
428 |
< |
scalecolor(scan[i], mult); |
428 |
> |
scalecolor(scan[x], mult); |
429 |
|
} |
430 |
|
} |
431 |
|
|
435 |
|
{ |
436 |
|
double b, s; |
437 |
|
register int i; |
438 |
< |
double wlum, sf; |
438 |
> |
double wlum, sf, dlum; |
439 |
|
|
440 |
|
sf = scalef*inpexp; |
441 |
|
if (lumf == cielum) sf *= WHTEFFICACY; |
442 |
|
s = (bwmax - bwmin)/HISTRES; |
443 |
|
for (i = 0, b = bwmin + .5*s; i < HISTRES; i++, b += s) { |
444 |
|
wlum = Lb(b); |
445 |
< |
if (what2do&DO_LINEAR) |
446 |
< |
fprintf(fp, "%e %e\n", wlum, sf*wlum); |
447 |
< |
else |
445 |
> |
if (what2do&DO_LINEAR) { |
446 |
> |
dlum = sf*wlum; |
447 |
> |
if (dlum > ldmax) dlum = ldmax; |
448 |
> |
else if (dlum < ldmin) dlum = ldmin; |
449 |
> |
fprintf(fp, "%e %e\n", wlum, dlum); |
450 |
> |
} else |
451 |
|
fprintf(fp, "%e %e\n", wlum, Lb(BLw(wlum))); |
452 |
|
} |
453 |
|
} |
232 |
– |
|
233 |
– |
|
234 |
– |
#ifdef DEBUG |
235 |
– |
doplots() /* generate debugging plots */ |
236 |
– |
{ |
237 |
– |
double T, b, s; |
238 |
– |
FILE *fp; |
239 |
– |
char fname[128]; |
240 |
– |
register int i; |
241 |
– |
|
242 |
– |
T = histot * (bwmax - bwmin) / HISTRES; |
243 |
– |
s = (bwmax - bwmin)/HISTRES; |
244 |
– |
|
245 |
– |
sprintf(fname, "%s_hist.plt", infn); |
246 |
– |
if ((fp = fopen(fname, "w")) == NULL) |
247 |
– |
syserror(fname); |
248 |
– |
fputs("include=curve.plt\n", fp); |
249 |
– |
fputs("title=\"Brightness Frequency Distribution\"\n", fp); |
250 |
– |
fprintf(fp, "subtitle=%s\n", infn); |
251 |
– |
fputs("ymin=0\n", fp); |
252 |
– |
fputs("xlabel=\"Perceptual Brightness B(Lw)\"\n", fp); |
253 |
– |
fputs("ylabel=\"Frequency Count\"\n", fp); |
254 |
– |
fputs("Alabel=\"Histogram\"\n", fp); |
255 |
– |
fputs("Alintype=0\n", fp); |
256 |
– |
fputs("Blabel=\"Envelope\"\n", fp); |
257 |
– |
fputs("Bsymsize=0\n", fp); |
258 |
– |
fputs("Adata=\n", fp); |
259 |
– |
for (i = 0, b = bwmin + .5*s; i < HISTRES; i++, b += s) |
260 |
– |
fprintf(fp, "\t%f %d\n", b, modhist[i]); |
261 |
– |
fputs(";\nBdata=\n", fp); |
262 |
– |
for (i = 0, b = bwmin + .5*s; i < HISTRES; i++, b += s) |
263 |
– |
fprintf(fp, "\t%f %f\n", b, T*clampf(Lb(b))); |
264 |
– |
fputs(";\n", fp); |
265 |
– |
fclose(fp); |
266 |
– |
} |
267 |
– |
#endif |