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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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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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getfixations(fp) /* load fixation history list */ |
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FILE *fp; |
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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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register int px, py, i; |
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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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} |
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gethisto(fp) /* load precomputed luminance histogram */ |
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FILE *fp; |
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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 l, b, lastb, w; |
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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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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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} |
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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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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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} |
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comphist() /* create foveal sampling histogram */ |
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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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register int x, y; |
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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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} |
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mkcumf() /* make cumulative distribution function */ |
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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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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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} |
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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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int i; |
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i = x = HISTRES*(b - bwmin)/(bwmax - bwmin); |
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x -= (double)i; |
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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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double |
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htcontrs(La) /* human threshold contrast sensitivity, dL(La) */ |
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double La; |
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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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double |
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clampf(Lw) /* histogram clamping function */ |
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double Lw; |
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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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} |
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double |
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crfactor(Lw) /* contrast reduction factor */ |
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double Lw; |
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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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#if ADJ_VEIL |
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mkcrfimage() /* compute contrast reduction factor image */ |
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static void |
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mkcrfimage(void) /* compute contrast reduction factor image */ |
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{ |
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int i; |
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float *crfptr; |
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int |
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mkbrmap() /* make dynamic range map */ |
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mkbrmap(void) /* make dynamic range map */ |
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{ |
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double Tdb, b, s; |
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double ceiling, trimmings; |
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register int i; |
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int i; |
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/* copy initial histogram */ |
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bcopy((void *)bwhist, (void *)modhist, sizeof(modhist)); |
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memcpy((void *)modhist, (void *)bwhist, sizeof(modhist)); |
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s = (bwmax - bwmin)/HISTRES; /* s is delta b */ |
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/* loop until satisfactory */ |
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do { |
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} |
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scotscan(scan, xres) /* apply scotopic color sensitivity loss */ |
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COLOR *scan; |
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int xres; |
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void |
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scotscan( /* apply scotopic color sensitivity loss */ |
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COLOR *scan, |
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int xres |
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) |
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{ |
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COLOR ctmp; |
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double incolor, b, Lw; |
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register int i; |
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int i; |
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for (i = 0; i < xres; i++) { |
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Lw = plum(scan[i]); |
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} |
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mapscan(scan, xres) /* apply tone mapping operator to scanline */ |
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COLOR *scan; |
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int xres; |
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void |
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mapscan( /* apply tone mapping operator to scanline */ |
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COLOR *scan, |
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int xres |
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) |
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{ |
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double mult, Lw, b; |
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register int x; |
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int x; |
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for (x = 0; x < xres; x++) { |
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Lw = plum(scan[x]); |
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} |
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putmapping(fp) /* put out mapping function */ |
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FILE *fp; |
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void |
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putmapping( /* put out mapping function */ |
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FILE *fp |
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) |
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{ |
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double b, s; |
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register int i; |
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int i; |
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double wlum, sf, dlum; |
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sf = scalef*inpexp; |