| 1 |
#ifndef lint |
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static const char RCSid[] = "$Id: pcond3.c,v 3.19 2021/04/13 02:56:42 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Routines for computing and applying brightness mapping. |
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*/ |
| 7 |
|
| 8 |
#include <string.h> |
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|
| 10 |
#include "pcond.h" |
| 11 |
#include "random.h" |
| 12 |
|
| 13 |
|
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#define CVRATIO 0.025 /* fraction of samples allowed > env. */ |
| 15 |
|
| 16 |
#define LN_10 2.30258509299404568402 |
| 17 |
#define exp10(x) exp(LN_10*(x)) |
| 18 |
|
| 19 |
double modhist[HISTRES]; /* modified histogram */ |
| 20 |
double mhistot; /* modified histogram total */ |
| 21 |
double cumf[HISTRES+1]; /* cumulative distribution function */ |
| 22 |
|
| 23 |
static double centprob(int x, int y); |
| 24 |
static void mkcumf(void); |
| 25 |
static double cf(double b); |
| 26 |
static double BLw(double Lw); |
| 27 |
static float *getlumsamp(int n); |
| 28 |
#if ADJ_VEIL |
| 29 |
static void mkcrfimage(void); |
| 30 |
#endif |
| 31 |
|
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|
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|
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void |
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getfixations( /* load fixation history list */ |
| 36 |
FILE *fp |
| 37 |
) |
| 38 |
{ |
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#define FIXHUNK 128 |
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RESOLU fvres; |
| 41 |
int pos[2]; |
| 42 |
int px, py, i; |
| 43 |
/* initialize our resolution struct */ |
| 44 |
if ((fvres.rt=inpres.rt)&YMAJOR) { |
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fvres.xr = fvxr; |
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fvres.yr = fvyr; |
| 47 |
} else { |
| 48 |
fvres.xr = fvyr; |
| 49 |
fvres.yr = fvxr; |
| 50 |
} |
| 51 |
/* read each picture position */ |
| 52 |
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 */ |
| 57 |
for (px = pos[0]-1; px <= pos[0]+1; px++) { |
| 58 |
if (px < 0 || px >= fvxr) |
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continue; |
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for (py = pos[1]-1; py <= pos[1]+1; py++) { |
| 61 |
if (py < 0 || py >= fvyr) |
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continue; |
| 63 |
for (i = nfixations; i-- > 0; ) |
| 64 |
if (fixlst[i][0] == px && |
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fixlst[i][1] == py) |
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break; |
| 67 |
if (i >= 0) |
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continue; /* already there */ |
| 69 |
if (nfixations % FIXHUNK == 0) { |
| 70 |
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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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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|
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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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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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|
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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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|
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if (x <= 0 && fread2colrs(cscan, x=scanlen(&inpres), infp, |
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NCSAMP, WLPART) < 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); |
| 204 |
} |
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rval = frandom(); /* random distance to next sample */ |
| 206 |
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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|
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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 */ |
| 233 |
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; |
| 254 |
if (lwmax > LMAX) |
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lwmax = LMAX; |
| 256 |
bwmax = Bl(lwmax); |
| 257 |
if (lwmin < LMIN) { |
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lwmin = LMIN; |
| 259 |
bwmin = Bl(LMIN); |
| 260 |
} else { /* duplicate bottom bin */ |
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bwmin = bwmax - (bwmax-Bl(lwmin))*HISTRES/(HISTRES-1); |
| 262 |
lwmin = Lb(bwmin); |
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} |
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/* (re)compute histogram */ |
| 265 |
bwavg = 0.; |
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histot = 0.; |
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memset(bwhist, 0, sizeof(bwhist)); |
| 268 |
/* global average */ |
| 269 |
if (!(what2do&DO_FIXHIST) || fixfrac < 1.-FTINY) { |
| 270 |
for (y = 0; y < fvyr; y++) |
| 271 |
for (x = 0; x < fvxr; x++) { |
| 272 |
l = plum(fovscan(y)[x]); |
| 273 |
if (l < lwmin+FTINY) continue; |
| 274 |
if (l >= lwmax-FTINY) continue; |
| 275 |
b = Bl(l); |
| 276 |
w = what2do&DO_CWEIGHT ? centprob(x,y) : 1.; |
| 277 |
bwavg += w*b; |
| 278 |
bwhist[bwhi(b)] += w; |
| 279 |
histot += w; |
| 280 |
} |
| 281 |
/* weight for point luminances */ |
| 282 |
w = 1. * histot / nlumsamp; |
| 283 |
for (x = nlumsamp; x--; ) { |
| 284 |
l = lumsamp[x]; |
| 285 |
if (l < lwmin+FTINY) continue; |
| 286 |
if (l >= lwmax-FTINY) continue; |
| 287 |
b = Bl(l); |
| 288 |
bwavg += w*b; |
| 289 |
bwhist[bwhi(b)] += w; |
| 290 |
histot += w; |
| 291 |
} |
| 292 |
} |
| 293 |
/* average fixation points */ |
| 294 |
if (what2do&DO_FIXHIST && nfixations > 0) { |
| 295 |
if (histot > FTINY) |
| 296 |
w = fixfrac/(1.-fixfrac)*histot/nfixations; |
| 297 |
else |
| 298 |
w = 1.; |
| 299 |
for (x = 0; x < nfixations; x++) { |
| 300 |
l = plum(fovscan(fixlst[x][1])[fixlst[x][0]]); |
| 301 |
if (l < lwmin+FTINY) continue; |
| 302 |
if (l >= lwmax-FTINY) continue; |
| 303 |
b = Bl(l); |
| 304 |
bwavg += w*b; |
| 305 |
bwhist[bwhi(b)] += w; |
| 306 |
histot += w; |
| 307 |
} |
| 308 |
} |
| 309 |
bwavg /= histot; |
| 310 |
if (lwmin > LMIN+FTINY) { /* add false samples at bottom */ |
| 311 |
bwhist[1] *= 0.5; |
| 312 |
bwhist[0] += bwhist[1]; |
| 313 |
} |
| 314 |
free(lumsamp); |
| 315 |
} |
| 316 |
|
| 317 |
|
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static void |
| 319 |
mkcumf(void) /* make cumulative distribution function */ |
| 320 |
{ |
| 321 |
int i; |
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double sum; |
| 323 |
|
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mhistot = 0.; /* compute modified total */ |
| 325 |
for (i = 0; i < HISTRES; i++) |
| 326 |
mhistot += modhist[i]; |
| 327 |
|
| 328 |
sum = 0.; /* compute cumulative function */ |
| 329 |
for (i = 0; i < HISTRES; i++) { |
| 330 |
cumf[i] = sum/mhistot; |
| 331 |
sum += modhist[i]; |
| 332 |
} |
| 333 |
cumf[HISTRES] = 1.; |
| 334 |
} |
| 335 |
|
| 336 |
|
| 337 |
static double |
| 338 |
cf( /* return cumulative function at b */ |
| 339 |
double b |
| 340 |
) |
| 341 |
{ |
| 342 |
double x; |
| 343 |
int i; |
| 344 |
|
| 345 |
i = x = HISTRES*(b - bwmin)/(bwmax - bwmin); |
| 346 |
x -= (double)i; |
| 347 |
return(cumf[i]*(1.-x) + cumf[i+1]*x); |
| 348 |
} |
| 349 |
|
| 350 |
|
| 351 |
static double |
| 352 |
BLw( /* map world luminance to display brightness */ |
| 353 |
double Lw |
| 354 |
) |
| 355 |
{ |
| 356 |
double b; |
| 357 |
|
| 358 |
if (Lw <= LMIN || (b = Bl(Lw)) <= bwmin+FTINY) |
| 359 |
return(Bldmin); |
| 360 |
if (b >= bwmax-FTINY) |
| 361 |
return(Bldmax); |
| 362 |
return(Bldmin + cf(b)*(Bldmax-Bldmin)); |
| 363 |
} |
| 364 |
|
| 365 |
|
| 366 |
double |
| 367 |
htcontrs( /* human threshold contrast sensitivity, dL(La) */ |
| 368 |
double La |
| 369 |
) |
| 370 |
{ |
| 371 |
double l10La, l10dL; |
| 372 |
/* formula taken from Ferwerda et al. [SG96] */ |
| 373 |
if (La < 1.148e-4) |
| 374 |
return(1.38e-3); |
| 375 |
l10La = log10(La); |
| 376 |
if (l10La < -1.44) /* rod response regime */ |
| 377 |
l10dL = pow(.405*l10La + 1.6, 2.18) - 2.86; |
| 378 |
else if (l10La < -.0184) |
| 379 |
l10dL = l10La - .395; |
| 380 |
else if (l10La < 1.9) /* cone response regime */ |
| 381 |
l10dL = pow(.249*l10La + .65, 2.7) - .72; |
| 382 |
else |
| 383 |
l10dL = l10La - 1.255; |
| 384 |
|
| 385 |
return(exp10(l10dL)); |
| 386 |
} |
| 387 |
|
| 388 |
|
| 389 |
double |
| 390 |
clampf( /* histogram clamping function */ |
| 391 |
double Lw |
| 392 |
) |
| 393 |
{ |
| 394 |
double bLw, ratio; |
| 395 |
|
| 396 |
bLw = BLw(Lw); /* apply current brightness map */ |
| 397 |
ratio = what2do&DO_HSENS ? htcontrs(Lb(bLw))/htcontrs(Lw) : Lb(bLw)/Lw; |
| 398 |
return(ratio/(Lb1(bLw)*(Bldmax-Bldmin)*Bl1(Lw))); |
| 399 |
} |
| 400 |
|
| 401 |
double |
| 402 |
crfactor( /* contrast reduction factor */ |
| 403 |
double Lw |
| 404 |
) |
| 405 |
{ |
| 406 |
int i = HISTRES*(Bl(Lw) - bwmin)/(bwmax - bwmin); |
| 407 |
double bLw, ratio, Tdb; |
| 408 |
|
| 409 |
if (i <= 0) |
| 410 |
return(1.0); |
| 411 |
if (i >= HISTRES) |
| 412 |
return(1.0); |
| 413 |
bLw = BLw(Lw); |
| 414 |
ratio = what2do&DO_HSENS ? htcontrs(Lb(bLw))/htcontrs(Lw) : Lb(bLw)/Lw; |
| 415 |
Tdb = mhistot * (bwmax - bwmin) / HISTRES; |
| 416 |
return(modhist[i]*Lb1(bLw)*(Bldmax-Bldmin)*Bl1(Lw)/(Tdb*ratio)); |
| 417 |
} |
| 418 |
|
| 419 |
|
| 420 |
#if ADJ_VEIL |
| 421 |
static void |
| 422 |
mkcrfimage(void) /* compute contrast reduction factor image */ |
| 423 |
{ |
| 424 |
int i; |
| 425 |
float *crfptr; |
| 426 |
COLOR *fovptr; |
| 427 |
|
| 428 |
if (crfimg == NULL) |
| 429 |
crfimg = (float *)malloc(fvxr*fvyr*sizeof(float)); |
| 430 |
if (crfimg == NULL) |
| 431 |
syserror("malloc"); |
| 432 |
crfptr = crfimg; |
| 433 |
fovptr = fovimg; |
| 434 |
for (i = fvxr*fvyr; i--; crfptr++, fovptr++) |
| 435 |
crfptr[0] = crfactor(plum(fovptr[0])); |
| 436 |
} |
| 437 |
#endif |
| 438 |
|
| 439 |
|
| 440 |
int |
| 441 |
mkbrmap(void) /* make dynamic range map */ |
| 442 |
{ |
| 443 |
double Tdb, b, s; |
| 444 |
double ceiling, trimmings; |
| 445 |
int i; |
| 446 |
/* copy initial histogram */ |
| 447 |
memcpy((void *)modhist, (void *)bwhist, sizeof(modhist)); |
| 448 |
s = (bwmax - bwmin)/HISTRES; /* s is delta b */ |
| 449 |
/* loop until satisfactory */ |
| 450 |
do { |
| 451 |
mkcumf(); /* sync brightness mapping */ |
| 452 |
if (mhistot <= histot*CVRATIO) |
| 453 |
return(-1); /* no compression needed! */ |
| 454 |
Tdb = mhistot * s; |
| 455 |
trimmings = 0.; /* clip to envelope */ |
| 456 |
for (i = 0, b = bwmin + .5*s; i < HISTRES; i++, b += s) { |
| 457 |
ceiling = Tdb*clampf(Lb(b)); |
| 458 |
if (modhist[i] > ceiling) { |
| 459 |
trimmings += modhist[i] - ceiling; |
| 460 |
modhist[i] = ceiling; |
| 461 |
} |
| 462 |
} |
| 463 |
} while (trimmings > mhistot*CVRATIO); |
| 464 |
|
| 465 |
#if ADJ_VEIL |
| 466 |
mkcrfimage(); /* contrast reduction image */ |
| 467 |
#endif |
| 468 |
|
| 469 |
return(0); /* we got it */ |
| 470 |
} |
| 471 |
|
| 472 |
|
| 473 |
void |
| 474 |
scotscan( /* apply scotopic color sensitivity loss */ |
| 475 |
COLOR *scan, |
| 476 |
int xres |
| 477 |
) |
| 478 |
{ |
| 479 |
COLOR ctmp; |
| 480 |
double incolor, b, Lw; |
| 481 |
int i; |
| 482 |
|
| 483 |
for (i = 0; i < xres; i++) { |
| 484 |
Lw = plum(scan[i]); |
| 485 |
if (Lw >= TopMesopic) |
| 486 |
incolor = 1.; |
| 487 |
else if (Lw <= BotMesopic) |
| 488 |
incolor = 0.; |
| 489 |
else |
| 490 |
incolor = (Lw - BotMesopic) / |
| 491 |
(TopMesopic - BotMesopic); |
| 492 |
if (incolor < 1.-FTINY) { |
| 493 |
b = (1.-incolor)*slum(scan[i])*inpexp/SWNORM; |
| 494 |
if (lumf == rgblum) b /= WHTEFFICACY; |
| 495 |
setcolor(ctmp, b, b, b); |
| 496 |
if (incolor <= FTINY) |
| 497 |
setcolor(scan[i], 0., 0., 0.); |
| 498 |
else |
| 499 |
scalecolor(scan[i], incolor); |
| 500 |
addcolor(scan[i], ctmp); |
| 501 |
} |
| 502 |
} |
| 503 |
} |
| 504 |
|
| 505 |
|
| 506 |
void |
| 507 |
mapscan( /* apply tone mapping operator to scanline */ |
| 508 |
COLOR *scan, |
| 509 |
int xres |
| 510 |
) |
| 511 |
{ |
| 512 |
double mult, Lw, b; |
| 513 |
int x; |
| 514 |
|
| 515 |
for (x = 0; x < xres; x++) { |
| 516 |
Lw = plum(scan[x]); |
| 517 |
if (Lw < LMIN) { |
| 518 |
setcolor(scan[x], 0., 0., 0.); |
| 519 |
continue; |
| 520 |
} |
| 521 |
b = BLw(Lw); /* apply brightness mapping */ |
| 522 |
mult = (Lb(b) - ldmin)/(ldmax - ldmin)/(Lw*inpexp); |
| 523 |
if (lumf == rgblum) mult *= WHTEFFICACY; |
| 524 |
scalecolor(scan[x], mult); |
| 525 |
} |
| 526 |
} |
| 527 |
|
| 528 |
|
| 529 |
void |
| 530 |
putmapping( /* put out mapping function */ |
| 531 |
FILE *fp |
| 532 |
) |
| 533 |
{ |
| 534 |
double b, s; |
| 535 |
int i; |
| 536 |
double wlum, sf, dlum; |
| 537 |
|
| 538 |
sf = scalef*inpexp; |
| 539 |
if (lumf == cielum) sf *= WHTEFFICACY; |
| 540 |
s = (bwmax - bwmin)/HISTRES; |
| 541 |
for (i = 0, b = bwmin + .5*s; i < HISTRES; i++, b += s) { |
| 542 |
wlum = Lb(b); |
| 543 |
if (what2do&DO_LINEAR) { |
| 544 |
dlum = sf*wlum; |
| 545 |
if (dlum > ldmax) dlum = ldmax; |
| 546 |
else if (dlum < ldmin) dlum = ldmin; |
| 547 |
fprintf(fp, "%e %e\n", wlum, dlum); |
| 548 |
} else |
| 549 |
fprintf(fp, "%e %e\n", wlum, Lb(BLw(wlum))); |
| 550 |
} |
| 551 |
} |
