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#ifndef lint
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static const char RCSid[] = "$Id: pcond3.c,v 3.17 2017/11/30 18:43:05 greg Exp $";
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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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#include "random.h"
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#define CVRATIO 0.025 /* fraction of samples allowed > env. */
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#define LN_10 2.30258509299404568402
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#define exp10(x) exp(LN_10*(x))
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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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static float *getlumsamp(int n);
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#if ADJ_VEIL
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static void mkcrfimage(void);
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#endif
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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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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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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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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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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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static float *
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getlumsamp(int n) /* get set of random point sample luminances */
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{
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float *ls = (float *)malloc(n*sizeof(float));
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COLR *cscan = (COLR *)malloc(scanlen(&inpres)*sizeof(COLR));
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long startpos = ftell(infp);
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long npleft = (long)inpres.xr*inpres.yr;
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int x;
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if ((ls == NULL) | (cscan == NULL))
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syserror("malloc");
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x = 0; /* read/convert samples */
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while (n > 0) {
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COLOR col;
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int sv = 0;
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double rval, cumprob = 0;
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if (x <= 0 && freadcolrs(cscan, x=scanlen(&inpres), infp) < 0) {
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fprintf(stderr, "%s: %s: scanline read error\n",
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progname, infn);
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exit(1);
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}
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rval = frandom(); /* random distance to next sample */
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while ((cumprob += (1.-cumprob)*n/(npleft-sv)) < rval)
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sv++;
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if (x < ++sv) { /* out of pixels in this scanline */
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npleft -= x;
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x = 0;
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continue;
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}
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x -= sv;
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colr_color(col, cscan[x]);
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ls[--n] = plum(col);
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npleft -= sv;
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}
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free(cscan); /* clean up and reset file pointer */
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if (fseek(infp, startpos, SEEK_SET) < 0)
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syserror("fseek");
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return(ls);
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}
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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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float *lumsamp;
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int nlumsamp;
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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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/* sample luminance pixels */
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nlumsamp = fvxr*fvyr*16;
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if (nlumsamp > inpres.xr*inpres.yr)
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nlumsamp = inpres.xr*inpres.yr;
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lumsamp = getlumsamp(nlumsamp);
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for (x = nlumsamp; x--; ) {
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l = lumsamp[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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memset(bwhist, 0, sizeof(bwhist));
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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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/* weight for point luminances */
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w = 1. * histot / nlumsamp;
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for (x = nlumsamp; x--; ) {
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l = lumsamp[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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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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/* 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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free(lumsamp);
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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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| 320 |
int i;
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double sum;
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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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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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| 334 |
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static double
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cf( /* return cumulative function at b */
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| 338 |
double b
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| 339 |
)
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| 340 |
{
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| 341 |
double x;
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| 342 |
int i;
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| 343 |
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| 344 |
i = x = HISTRES*(b - bwmin)/(bwmax - bwmin);
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x -= (double)i;
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| 346 |
return(cumf[i]*(1.-x) + cumf[i+1]*x);
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| 347 |
}
|
| 348 |
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| 349 |
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| 350 |
static double
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| 351 |
BLw( /* map world luminance to display brightness */
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| 352 |
double Lw
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| 353 |
)
|
| 354 |
{
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| 355 |
double b;
|
| 356 |
|
| 357 |
if (Lw <= LMIN || (b = Bl(Lw)) <= bwmin+FTINY)
|
| 358 |
return(Bldmin);
|
| 359 |
if (b >= bwmax-FTINY)
|
| 360 |
return(Bldmax);
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| 361 |
return(Bldmin + cf(b)*(Bldmax-Bldmin));
|
| 362 |
}
|
| 363 |
|
| 364 |
|
| 365 |
double
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| 366 |
htcontrs( /* human threshold contrast sensitivity, dL(La) */
|
| 367 |
double La
|
| 368 |
)
|
| 369 |
{
|
| 370 |
double l10La, l10dL;
|
| 371 |
/* formula taken from Ferwerda et al. [SG96] */
|
| 372 |
if (La < 1.148e-4)
|
| 373 |
return(1.38e-3);
|
| 374 |
l10La = log10(La);
|
| 375 |
if (l10La < -1.44) /* rod response regime */
|
| 376 |
l10dL = pow(.405*l10La + 1.6, 2.18) - 2.86;
|
| 377 |
else if (l10La < -.0184)
|
| 378 |
l10dL = l10La - .395;
|
| 379 |
else if (l10La < 1.9) /* cone response regime */
|
| 380 |
l10dL = pow(.249*l10La + .65, 2.7) - .72;
|
| 381 |
else
|
| 382 |
l10dL = l10La - 1.255;
|
| 383 |
|
| 384 |
return(exp10(l10dL));
|
| 385 |
}
|
| 386 |
|
| 387 |
|
| 388 |
double
|
| 389 |
clampf( /* histogram clamping function */
|
| 390 |
double Lw
|
| 391 |
)
|
| 392 |
{
|
| 393 |
double bLw, ratio;
|
| 394 |
|
| 395 |
bLw = BLw(Lw); /* apply current brightness map */
|
| 396 |
ratio = what2do&DO_HSENS ? htcontrs(Lb(bLw))/htcontrs(Lw) : Lb(bLw)/Lw;
|
| 397 |
return(ratio/(Lb1(bLw)*(Bldmax-Bldmin)*Bl1(Lw)));
|
| 398 |
}
|
| 399 |
|
| 400 |
double
|
| 401 |
crfactor( /* contrast reduction factor */
|
| 402 |
double Lw
|
| 403 |
)
|
| 404 |
{
|
| 405 |
int i = HISTRES*(Bl(Lw) - bwmin)/(bwmax - bwmin);
|
| 406 |
double bLw, ratio, Tdb;
|
| 407 |
|
| 408 |
if (i <= 0)
|
| 409 |
return(1.0);
|
| 410 |
if (i >= HISTRES)
|
| 411 |
return(1.0);
|
| 412 |
bLw = BLw(Lw);
|
| 413 |
ratio = what2do&DO_HSENS ? htcontrs(Lb(bLw))/htcontrs(Lw) : Lb(bLw)/Lw;
|
| 414 |
Tdb = mhistot * (bwmax - bwmin) / HISTRES;
|
| 415 |
return(modhist[i]*Lb1(bLw)*(Bldmax-Bldmin)*Bl1(Lw)/(Tdb*ratio));
|
| 416 |
}
|
| 417 |
|
| 418 |
|
| 419 |
#if ADJ_VEIL
|
| 420 |
static void
|
| 421 |
mkcrfimage(void) /* compute contrast reduction factor image */
|
| 422 |
{
|
| 423 |
int i;
|
| 424 |
float *crfptr;
|
| 425 |
COLOR *fovptr;
|
| 426 |
|
| 427 |
if (crfimg == NULL)
|
| 428 |
crfimg = (float *)malloc(fvxr*fvyr*sizeof(float));
|
| 429 |
if (crfimg == NULL)
|
| 430 |
syserror("malloc");
|
| 431 |
crfptr = crfimg;
|
| 432 |
fovptr = fovimg;
|
| 433 |
for (i = fvxr*fvyr; i--; crfptr++, fovptr++)
|
| 434 |
crfptr[0] = crfactor(plum(fovptr[0]));
|
| 435 |
}
|
| 436 |
#endif
|
| 437 |
|
| 438 |
|
| 439 |
int
|
| 440 |
mkbrmap(void) /* make dynamic range map */
|
| 441 |
{
|
| 442 |
double Tdb, b, s;
|
| 443 |
double ceiling, trimmings;
|
| 444 |
int i;
|
| 445 |
/* copy initial histogram */
|
| 446 |
memcpy((void *)modhist, (void *)bwhist, sizeof(modhist));
|
| 447 |
s = (bwmax - bwmin)/HISTRES; /* s is delta b */
|
| 448 |
/* loop until satisfactory */
|
| 449 |
do {
|
| 450 |
mkcumf(); /* sync brightness mapping */
|
| 451 |
if (mhistot <= histot*CVRATIO)
|
| 452 |
return(-1); /* no compression needed! */
|
| 453 |
Tdb = mhistot * s;
|
| 454 |
trimmings = 0.; /* clip to envelope */
|
| 455 |
for (i = 0, b = bwmin + .5*s; i < HISTRES; i++, b += s) {
|
| 456 |
ceiling = Tdb*clampf(Lb(b));
|
| 457 |
if (modhist[i] > ceiling) {
|
| 458 |
trimmings += modhist[i] - ceiling;
|
| 459 |
modhist[i] = ceiling;
|
| 460 |
}
|
| 461 |
}
|
| 462 |
} while (trimmings > histot*CVRATIO);
|
| 463 |
|
| 464 |
#if ADJ_VEIL
|
| 465 |
mkcrfimage(); /* contrast reduction image */
|
| 466 |
#endif
|
| 467 |
|
| 468 |
return(0); /* we got it */
|
| 469 |
}
|
| 470 |
|
| 471 |
|
| 472 |
void
|
| 473 |
scotscan( /* apply scotopic color sensitivity loss */
|
| 474 |
COLOR *scan,
|
| 475 |
int xres
|
| 476 |
)
|
| 477 |
{
|
| 478 |
COLOR ctmp;
|
| 479 |
double incolor, b, Lw;
|
| 480 |
int i;
|
| 481 |
|
| 482 |
for (i = 0; i < xres; i++) {
|
| 483 |
Lw = plum(scan[i]);
|
| 484 |
if (Lw >= TopMesopic)
|
| 485 |
incolor = 1.;
|
| 486 |
else if (Lw <= BotMesopic)
|
| 487 |
incolor = 0.;
|
| 488 |
else
|
| 489 |
incolor = (Lw - BotMesopic) /
|
| 490 |
(TopMesopic - BotMesopic);
|
| 491 |
if (incolor < 1.-FTINY) {
|
| 492 |
b = (1.-incolor)*slum(scan[i])*inpexp/SWNORM;
|
| 493 |
if (lumf == rgblum) b /= WHTEFFICACY;
|
| 494 |
setcolor(ctmp, b, b, b);
|
| 495 |
if (incolor <= FTINY)
|
| 496 |
setcolor(scan[i], 0., 0., 0.);
|
| 497 |
else
|
| 498 |
scalecolor(scan[i], incolor);
|
| 499 |
addcolor(scan[i], ctmp);
|
| 500 |
}
|
| 501 |
}
|
| 502 |
}
|
| 503 |
|
| 504 |
|
| 505 |
void
|
| 506 |
mapscan( /* apply tone mapping operator to scanline */
|
| 507 |
COLOR *scan,
|
| 508 |
int xres
|
| 509 |
)
|
| 510 |
{
|
| 511 |
double mult, Lw, b;
|
| 512 |
int x;
|
| 513 |
|
| 514 |
for (x = 0; x < xres; x++) {
|
| 515 |
Lw = plum(scan[x]);
|
| 516 |
if (Lw < LMIN) {
|
| 517 |
setcolor(scan[x], 0., 0., 0.);
|
| 518 |
continue;
|
| 519 |
}
|
| 520 |
b = BLw(Lw); /* apply brightness mapping */
|
| 521 |
mult = (Lb(b) - ldmin)/(ldmax - ldmin)/(Lw*inpexp);
|
| 522 |
if (lumf == rgblum) mult *= WHTEFFICACY;
|
| 523 |
scalecolor(scan[x], mult);
|
| 524 |
}
|
| 525 |
}
|
| 526 |
|
| 527 |
|
| 528 |
void
|
| 529 |
putmapping( /* put out mapping function */
|
| 530 |
FILE *fp
|
| 531 |
)
|
| 532 |
{
|
| 533 |
double b, s;
|
| 534 |
int i;
|
| 535 |
double wlum, sf, dlum;
|
| 536 |
|
| 537 |
sf = scalef*inpexp;
|
| 538 |
if (lumf == cielum) sf *= WHTEFFICACY;
|
| 539 |
s = (bwmax - bwmin)/HISTRES;
|
| 540 |
for (i = 0, b = bwmin + .5*s; i < HISTRES; i++, b += s) {
|
| 541 |
wlum = Lb(b);
|
| 542 |
if (what2do&DO_LINEAR) {
|
| 543 |
dlum = sf*wlum;
|
| 544 |
if (dlum > ldmax) dlum = ldmax;
|
| 545 |
else if (dlum < ldmin) dlum = ldmin;
|
| 546 |
fprintf(fp, "%e %e\n", wlum, dlum);
|
| 547 |
} else
|
| 548 |
fprintf(fp, "%e %e\n", wlum, Lb(BLw(wlum)));
|
| 549 |
}
|
| 550 |
}
|
