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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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* 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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static double centprob(int x, int y); |
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static void mkcumf(void); |
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static double cf(double b); |
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static double BLw(double Lw); |
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#if ADJ_VEIL |
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static void mkcrfimage(void); |
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#endif |
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mkcumf() /* make cumulative distribution function */ |
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extern void |
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getfixations( /* load fixation history list */ |
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FILE *fp |
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) |
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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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extern void |
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gethisto( /* load precomputed luminance histogram */ |
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FILE *fp |
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) |
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{ |
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double histo[MAXPREHIST]; |
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double histart, histep; |
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double b, lastb, w; |
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int n; |
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register int i; |
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register long sum; |
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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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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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|
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static double |
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centprob( /* center-weighting probability function */ |
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int x, |
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int y |
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) |
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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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extern void |
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comphist(void) /* 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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static void |
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mkcumf(void) /* make cumulative distribution function */ |
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{ |
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register int i; |
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register double sum; |
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|
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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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} |
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double |
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cf(b) /* return cumulative function at b */ |
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double b; |
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static double |
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cf( /* return cumulative function at b */ |
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double b |
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) |
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{ |
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double x; |
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register int i; |
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} |
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|
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double |
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BLw(Lw) /* map world luminance to display brightness */ |
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double Lw; |
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static double |
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BLw( /* map world luminance to display brightness */ |
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double Lw |
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) |
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{ |
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double b; |
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} |
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double |
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htcontrs(La) /* human threshold contrast sensitivity, dL(La) */ |
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< |
double La; |
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> |
extern double |
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htcontrs( /* human threshold contrast sensitivity, dL(La) */ |
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double La |
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) |
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{ |
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double l10La, l10dL; |
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/* formula taken from Ferwerda et al. [SG96] */ |
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} |
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|
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double |
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clampf(Lw) /* derivative clamping function */ |
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double Lw; |
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extern double |
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> |
clampf( /* histogram clamping function */ |
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double Lw |
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) |
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{ |
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double bLw, ratio; |
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return(ratio/(Lb1(bLw)*(Bldmax-Bldmin)*Bl1(Lw))); |
| 330 |
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} |
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|
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extern double |
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crfactor( /* contrast reduction factor */ |
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double Lw |
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) |
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{ |
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int i = HISTRES*(Bl(Lw) - bwmin)/(bwmax - bwmin); |
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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 */ |
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< |
double bw; |
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> |
if (i <= 0) |
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> |
return(1.0); |
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> |
if (i >= HISTRES) |
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> |
return(1.0); |
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bLw = BLw(Lw); |
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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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> |
static void |
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> |
mkcrfimage(void) /* compute contrast reduction factor image */ |
| 354 |
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{ |
| 355 |
< |
if (what2do&DO_HSENS && cf(bw) - (bw - bwmin)/(Bldmax - bwmin)) |
| 356 |
< |
return(1); |
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< |
return(-1); |
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> |
int i; |
| 356 |
> |
float *crfptr; |
| 357 |
> |
COLOR *fovptr; |
| 358 |
> |
|
| 359 |
> |
if (crfimg == NULL) |
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> |
crfimg = (float *)malloc(fvxr*fvyr*sizeof(float)); |
| 361 |
> |
if (crfimg == NULL) |
| 362 |
> |
syserror("malloc"); |
| 363 |
> |
crfptr = crfimg; |
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> |
fovptr = fovimg; |
| 365 |
> |
for (i = fvxr*fvyr; i--; crfptr++, fovptr++) |
| 366 |
> |
crfptr[0] = crfactor(plum(fovptr[0])); |
| 367 |
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} |
| 368 |
+ |
#endif |
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|
| 370 |
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|
| 371 |
< |
int |
| 372 |
< |
mkbrmap() /* make dynamic range map */ |
| 371 |
> |
extern int |
| 372 |
> |
mkbrmap(void) /* make dynamic range map */ |
| 373 |
|
{ |
| 374 |
< |
int hdiffs[HISTRES], above, below; |
| 375 |
< |
double T, b, s; |
| 113 |
< |
int maxd, maxi, sd; |
| 374 |
> |
double Tdb, b, s; |
| 375 |
> |
double ceiling, trimmings; |
| 376 |
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register int i; |
| 377 |
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/* copy initial histogram */ |
| 378 |
< |
for (i = 0; i < HISTRES; i++) |
| 379 |
< |
modhist[i] = bwhist[i]; |
| 118 |
< |
T = histot * (bwmax - bwmin) / HISTRES; |
| 119 |
< |
s = (bwmax - bwmin)/HISTRES; |
| 378 |
> |
memcpy((void *)modhist, (void *)bwhist, sizeof(modhist)); |
| 379 |
> |
s = (bwmax - bwmin)/HISTRES; /* s is delta b */ |
| 380 |
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/* loop until satisfactory */ |
| 381 |
< |
for ( ; ; ) { |
| 382 |
< |
mkcumf(); /* sync brightness mapping */ |
| 383 |
< |
above = below = 0; /* compute visibility overflow */ |
| 381 |
> |
do { |
| 382 |
> |
mkcumf(); /* sync brightness mapping */ |
| 383 |
> |
if (mhistot <= histot*CVRATIO) |
| 384 |
> |
return(-1); /* no compression needed! */ |
| 385 |
> |
Tdb = mhistot * s; |
| 386 |
> |
trimmings = 0.; /* clip to envelope */ |
| 387 |
|
for (i = 0, b = bwmin + .5*s; i < HISTRES; i++, b += s) { |
| 388 |
< |
hdiffs[i] = modhist[i] - (int)(T*clampf(Lb(b)) + .5); |
| 389 |
< |
if (hdiffs[i] > 0) above += hdiffs[i]; |
| 390 |
< |
else below -= hdiffs[i]; |
| 388 |
> |
ceiling = Tdb*clampf(Lb(b)); |
| 389 |
> |
if (modhist[i] > ceiling) { |
| 390 |
> |
trimmings += modhist[i] - ceiling; |
| 391 |
> |
modhist[i] = ceiling; |
| 392 |
> |
} |
| 393 |
|
} |
| 394 |
< |
if (above <= histot*CVRATIO) |
| 395 |
< |
break; /* close enough */ |
| 396 |
< |
if (above-below >= 0) |
| 397 |
< |
return(-1); /* Houston, we have a problem.... */ |
| 398 |
< |
/* original looped here as well (BEGIN_L2) */ |
| 399 |
< |
maxd = 0; /* find largest overvis */ |
| 400 |
< |
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); |
| 394 |
> |
} while (trimmings > histot*CVRATIO); |
| 395 |
> |
|
| 396 |
> |
#if ADJ_VEIL |
| 397 |
> |
mkcrfimage(); /* contrast reduction image */ |
| 398 |
> |
#endif |
| 399 |
> |
|
| 400 |
> |
return(0); /* we got it */ |
| 401 |
|
} |
| 402 |
|
|
| 403 |
|
|
| 404 |
< |
scotscan(scan, xres) /* apply scotopic color sensitivity loss */ |
| 405 |
< |
COLOR *scan; |
| 406 |
< |
int xres; |
| 404 |
> |
extern void |
| 405 |
> |
scotscan( /* apply scotopic color sensitivity loss */ |
| 406 |
> |
COLOR *scan, |
| 407 |
> |
int xres |
| 408 |
> |
) |
| 409 |
|
{ |
| 410 |
|
COLOR ctmp; |
| 411 |
|
double incolor, b, Lw; |
| 434 |
|
} |
| 435 |
|
|
| 436 |
|
|
| 437 |
< |
mapscan(scan, xres) /* apply tone mapping operator to scanline */ |
| 438 |
< |
COLOR *scan; |
| 439 |
< |
int xres; |
| 437 |
> |
extern void |
| 438 |
> |
mapscan( /* apply tone mapping operator to scanline */ |
| 439 |
> |
COLOR *scan, |
| 440 |
> |
int xres |
| 441 |
> |
) |
| 442 |
|
{ |
| 443 |
|
double mult, Lw, b; |
| 444 |
< |
register int i; |
| 444 |
> |
register int x; |
| 445 |
|
|
| 446 |
< |
for (i = 0; i < xres; i++) { |
| 447 |
< |
Lw = plum(scan[i]); |
| 446 |
> |
for (x = 0; x < xres; x++) { |
| 447 |
> |
Lw = plum(scan[x]); |
| 448 |
|
if (Lw < LMIN) { |
| 449 |
< |
setcolor(scan[i], 0., 0., 0.); |
| 449 |
> |
setcolor(scan[x], 0., 0., 0.); |
| 450 |
|
continue; |
| 451 |
|
} |
| 452 |
< |
b = BLw(Lw); |
| 453 |
< |
mult = (Lb(b) - ldmin)/(ldmax - ldmin) / (Lw*inpexp); |
| 452 |
> |
b = BLw(Lw); /* apply brightness mapping */ |
| 453 |
> |
mult = (Lb(b) - ldmin)/(ldmax - ldmin)/(Lw*inpexp); |
| 454 |
|
if (lumf == rgblum) mult *= WHTEFFICACY; |
| 455 |
< |
scalecolor(scan[i], mult); |
| 455 |
> |
scalecolor(scan[x], mult); |
| 456 |
|
} |
| 457 |
|
} |
| 458 |
|
|
| 459 |
|
|
| 460 |
< |
putmapping(fp) /* put out mapping function */ |
| 461 |
< |
FILE *fp; |
| 460 |
> |
extern void |
| 461 |
> |
putmapping( /* put out mapping function */ |
| 462 |
> |
FILE *fp |
| 463 |
> |
) |
| 464 |
|
{ |
| 465 |
|
double b, s; |
| 466 |
|
register int i; |
| 467 |
< |
double wlum, sf; |
| 467 |
> |
double wlum, sf, dlum; |
| 468 |
|
|
| 469 |
|
sf = scalef*inpexp; |
| 470 |
|
if (lumf == cielum) sf *= WHTEFFICACY; |
| 471 |
|
s = (bwmax - bwmin)/HISTRES; |
| 472 |
|
for (i = 0, b = bwmin + .5*s; i < HISTRES; i++, b += s) { |
| 473 |
|
wlum = Lb(b); |
| 474 |
< |
if (what2do&DO_LINEAR) |
| 475 |
< |
fprintf(fp, "%e %e\n", wlum, sf*wlum); |
| 476 |
< |
else |
| 474 |
> |
if (what2do&DO_LINEAR) { |
| 475 |
> |
dlum = sf*wlum; |
| 476 |
> |
if (dlum > ldmax) dlum = ldmax; |
| 477 |
> |
else if (dlum < ldmin) dlum = ldmin; |
| 478 |
> |
fprintf(fp, "%e %e\n", wlum, dlum); |
| 479 |
> |
} else |
| 480 |
|
fprintf(fp, "%e %e\n", wlum, Lb(BLw(wlum))); |
| 481 |
|
} |
| 482 |
|
} |
| 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 |
