1 |
– |
/* Copyright (c) 1997 Regents of the University of California */ |
2 |
– |
|
1 |
|
#ifndef lint |
2 |
< |
static char SCCSid[] = "$SunId$ LBL"; |
2 |
> |
static const char RCSid[] = "$Id$"; |
3 |
|
#endif |
6 |
– |
|
4 |
|
/* |
5 |
|
* Routines for computing and applying brightness mapping. |
6 |
|
*/ |
7 |
|
|
8 |
+ |
#include <string.h> |
9 |
+ |
|
10 |
|
#include "pcond.h" |
11 |
+ |
#include "random.h" |
12 |
|
|
13 |
|
|
14 |
|
#define CVRATIO 0.025 /* fraction of samples allowed > env. */ |
16 |
|
#define LN_10 2.30258509299404568402 |
17 |
|
#define exp10(x) exp(LN_10*(x)) |
18 |
|
|
19 |
< |
float modhist[HISTRES]; /* modified histogram */ |
19 |
> |
double modhist[HISTRES]; /* modified histogram */ |
20 |
|
double mhistot; /* modified histogram total */ |
21 |
< |
float cumf[HISTRES+1]; /* cumulative distribution function */ |
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 |
|
|
32 |
< |
getfixations(fp) /* load fixation history list */ |
33 |
< |
FILE *fp; |
32 |
> |
|
33 |
> |
|
34 |
> |
void |
35 |
> |
getfixations( /* load fixation history list */ |
36 |
> |
FILE *fp |
37 |
> |
) |
38 |
|
{ |
39 |
|
#define FIXHUNK 128 |
40 |
|
RESOLU fvres; |
41 |
|
int pos[2]; |
42 |
< |
register int px, py, i; |
42 |
> |
int px, py, i; |
43 |
|
/* initialize our resolution struct */ |
44 |
< |
if ((fvres.or=inpres.or)&YMAJOR) { |
44 |
> |
if ((fvres.rt=inpres.rt)&YMAJOR) { |
45 |
|
fvres.xr = fvxr; |
46 |
|
fvres.yr = fvyr; |
47 |
|
} else { |
69 |
|
if (nfixations % FIXHUNK == 0) { |
70 |
|
if (nfixations) |
71 |
|
fixlst = (short (*)[2]) |
72 |
< |
realloc((char *)fixlst, |
72 |
> |
realloc((void *)fixlst, |
73 |
|
(nfixations+FIXHUNK)* |
74 |
|
2*sizeof(short)); |
75 |
|
else |
94 |
|
} |
95 |
|
|
96 |
|
|
97 |
< |
gethisto(fp) /* load precomputed luminance histogram */ |
98 |
< |
FILE *fp; |
97 |
> |
void |
98 |
> |
gethisto( /* load precomputed luminance histogram */ |
99 |
> |
FILE *fp |
100 |
> |
) |
101 |
|
{ |
102 |
< |
float histo[MAXPREHIST]; |
102 |
> |
double histo[MAXPREHIST]; |
103 |
|
double histart, histep; |
104 |
< |
double l, b, lastb, w; |
104 |
> |
double b, lastb, w; |
105 |
|
int n; |
106 |
< |
register int i; |
106 |
> |
int i; |
107 |
|
/* load data */ |
108 |
|
for (i = 0; i < MAXPREHIST && |
109 |
< |
fscanf(fp, "%lf %f", &b, &histo[i]) == 2; i++) { |
110 |
< |
if (i > 1 && fabs(b - lastb - histep) > 1e-3) { |
109 |
> |
fscanf(fp, "%lf %lf", &b, &histo[i]) == 2; i++) { |
110 |
> |
if (i > 1 && fabs(b - lastb - histep) > .001) { |
111 |
|
fprintf(stderr, |
112 |
|
"%s: uneven step size in histogram data\n", |
113 |
|
progname); |
114 |
|
exit(1); |
115 |
|
} |
116 |
|
if (i == 1) |
117 |
< |
histep = b - (histart = lastb); |
117 |
> |
if ((histep = b - (histart = lastb)) <= FTINY) { |
118 |
> |
fprintf(stderr, |
119 |
> |
"%s: illegal step in histogram data\n", |
120 |
> |
progname); |
121 |
> |
exit(1); |
122 |
> |
} |
123 |
|
lastb = b; |
124 |
|
} |
125 |
|
if (i < 2 || !feof(fp)) { |
134 |
|
/* find extrema */ |
135 |
|
for (i = 0; i < n && histo[i] <= FTINY; i++) |
136 |
|
; |
137 |
< |
bwmin = histart + i*histep; |
137 |
> |
bwmin = histart + (i-.001)*histep; |
138 |
|
for (i = n; i-- && histo[i] <= FTINY; ) |
139 |
|
; |
140 |
< |
bwmax = histart + i*histep; |
140 |
> |
bwmax = histart + (i+1.001)*histep; |
141 |
|
if (bwmax > Bl(LMAX)) |
142 |
|
bwmax = Bl(LMAX); |
143 |
|
if (bwmin < Bl(LMIN)) |
149 |
|
for (i = 0; i < HISTRES; i++) |
150 |
|
bwhist[i] = 0.; |
151 |
|
for (i = 0, b = histart; i < n; i++, b += histep) { |
152 |
< |
if (b < bwmin) continue; |
153 |
< |
if (b > bwmax) break; |
152 |
> |
if (b < bwmin+FTINY) continue; |
153 |
> |
if (b >= bwmax-FTINY) break; |
154 |
|
w = histo[i]; |
155 |
|
bwavg += w*b; |
156 |
|
bwhist[bwhi(b)] += w; |
164 |
|
} |
165 |
|
|
166 |
|
|
167 |
< |
double |
168 |
< |
centprob(x, y) /* center-weighting probability function */ |
169 |
< |
int x, y; |
167 |
> |
static double |
168 |
> |
centprob( /* center-weighting probability function */ |
169 |
> |
int x, |
170 |
> |
int y |
171 |
> |
) |
172 |
|
{ |
173 |
|
double xr, yr, p; |
174 |
|
/* paraboloid, 0 at 90 degrees from center */ |
179 |
|
} |
180 |
|
|
181 |
|
|
182 |
< |
comphist() /* create foveal sampling histogram */ |
182 |
> |
static float * |
183 |
> |
getlumsamp(int n) /* get set of random point sample luminances */ |
184 |
|
{ |
185 |
+ |
float *ls = (float *)malloc(n*sizeof(float)); |
186 |
+ |
COLR *cscan = (COLR *)malloc(scanlen(&inpres)*sizeof(COLR)); |
187 |
+ |
long startpos = ftell(infp); |
188 |
+ |
long npleft = (long)inpres.xr*inpres.yr; |
189 |
+ |
int x; |
190 |
+ |
|
191 |
+ |
if ((ls == NULL) | (cscan == NULL)) |
192 |
+ |
syserror("malloc"); |
193 |
+ |
x = 0; /* read/convert samples */ |
194 |
+ |
while (n > 0) { |
195 |
+ |
COLOR col; |
196 |
+ |
int sv = 0; |
197 |
+ |
double rval, cumprob = 0; |
198 |
+ |
|
199 |
+ |
if (x <= 0 && fread2colrs(cscan, x=scanlen(&inpres), infp, |
200 |
+ |
NCSAMP, WLPART) < 0) { |
201 |
+ |
fprintf(stderr, "%s: %s: scanline read error\n", |
202 |
+ |
progname, infn); |
203 |
+ |
exit(1); |
204 |
+ |
} |
205 |
+ |
rval = frandom(); /* random distance to next sample */ |
206 |
+ |
while ((cumprob += (1.-cumprob)*n/(npleft-sv)) < rval) |
207 |
+ |
sv++; |
208 |
+ |
if (x < ++sv) { /* out of pixels in this scanline */ |
209 |
+ |
npleft -= x; |
210 |
+ |
x = 0; |
211 |
+ |
continue; |
212 |
+ |
} |
213 |
+ |
x -= sv; |
214 |
+ |
colr_color(col, cscan[x]); |
215 |
+ |
ls[--n] = plum(col); |
216 |
+ |
npleft -= sv; |
217 |
+ |
} |
218 |
+ |
free(cscan); /* clean up and reset file pointer */ |
219 |
+ |
if (fseek(infp, startpos, SEEK_SET) < 0) |
220 |
+ |
syserror("fseek"); |
221 |
+ |
return(ls); |
222 |
+ |
} |
223 |
+ |
|
224 |
+ |
|
225 |
+ |
void |
226 |
+ |
comphist(void) /* create foveal sampling histogram */ |
227 |
+ |
{ |
228 |
|
double l, b, w, lwmin, lwmax; |
229 |
< |
register int x, y; |
229 |
> |
float *lumsamp; |
230 |
> |
int nlumsamp; |
231 |
> |
int x, y; |
232 |
|
/* check for precalculated histogram */ |
233 |
|
if (what2do&DO_PREHIST) |
234 |
|
return; |
240 |
|
if (l < lwmin) lwmin = l; |
241 |
|
if (l > lwmax) lwmax = l; |
242 |
|
} |
243 |
+ |
/* sample luminance pixels */ |
244 |
+ |
nlumsamp = fvxr*fvyr*16; |
245 |
+ |
if (nlumsamp > inpres.xr*inpres.yr) |
246 |
+ |
nlumsamp = inpres.xr*inpres.yr; |
247 |
+ |
lumsamp = getlumsamp(nlumsamp); |
248 |
+ |
for (x = nlumsamp; x--; ) { |
249 |
+ |
l = lumsamp[x]; |
250 |
+ |
if (l < lwmin) lwmin = l; |
251 |
+ |
if (l > lwmax) lwmax = l; |
252 |
+ |
} |
253 |
|
lwmax *= 1.01; |
254 |
|
if (lwmax > LMAX) |
255 |
|
lwmax = LMAX; |
264 |
|
/* (re)compute histogram */ |
265 |
|
bwavg = 0.; |
266 |
|
histot = 0.; |
267 |
< |
for (x = 0; x < HISTRES; x++) |
191 |
< |
bwhist[x] = 0.; |
267 |
> |
memset(bwhist, 0, sizeof(bwhist)); |
268 |
|
/* global average */ |
269 |
< |
if (!(what2do&DO_FIXHIST) || fixfrac < 1.-FTINY) |
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) continue; |
274 |
< |
if (l > lwmax) continue; |
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) |
298 |
|
w = 1.; |
299 |
|
for (x = 0; x < nfixations; x++) { |
300 |
|
l = plum(fovscan(fixlst[x][1])[fixlst[x][0]]); |
301 |
< |
if (l < lwmin) continue; |
302 |
< |
if (l > lwmax) continue; |
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; |
311 |
|
bwhist[1] *= 0.5; |
312 |
|
bwhist[0] += bwhist[1]; |
313 |
|
} |
314 |
+ |
free(lumsamp); |
315 |
|
} |
316 |
|
|
317 |
|
|
318 |
< |
mkcumf() /* make cumulative distribution function */ |
318 |
> |
static void |
319 |
> |
mkcumf(void) /* make cumulative distribution function */ |
320 |
|
{ |
321 |
< |
register int i; |
322 |
< |
register double sum; |
321 |
> |
int i; |
322 |
> |
double sum; |
323 |
|
|
324 |
|
mhistot = 0.; /* compute modified total */ |
325 |
|
for (i = 0; i < HISTRES; i++) |
334 |
|
} |
335 |
|
|
336 |
|
|
337 |
< |
double |
338 |
< |
cf(b) /* return cumulative function at b */ |
339 |
< |
double b; |
337 |
> |
static double |
338 |
> |
cf( /* return cumulative function at b */ |
339 |
> |
double b |
340 |
> |
) |
341 |
|
{ |
342 |
|
double x; |
343 |
< |
register int i; |
343 |
> |
int i; |
344 |
|
|
345 |
|
i = x = HISTRES*(b - bwmin)/(bwmax - bwmin); |
346 |
|
x -= (double)i; |
348 |
|
} |
349 |
|
|
350 |
|
|
351 |
< |
double |
352 |
< |
BLw(Lw) /* map world luminance to display brightness */ |
353 |
< |
double Lw; |
351 |
> |
static double |
352 |
> |
BLw( /* map world luminance to display brightness */ |
353 |
> |
double Lw |
354 |
> |
) |
355 |
|
{ |
356 |
|
double b; |
357 |
|
|
364 |
|
|
365 |
|
|
366 |
|
double |
367 |
< |
htcontrs(La) /* human threshold contrast sensitivity, dL(La) */ |
368 |
< |
double La; |
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] */ |
387 |
|
|
388 |
|
|
389 |
|
double |
390 |
< |
clampf(Lw) /* derivative clamping function */ |
391 |
< |
double Lw; |
390 |
> |
clampf( /* histogram clamping function */ |
391 |
> |
double Lw |
392 |
> |
) |
393 |
|
{ |
394 |
|
double bLw, ratio; |
395 |
|
|
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() /* make dynamic range map */ |
441 |
> |
mkbrmap(void) /* make dynamic range map */ |
442 |
|
{ |
443 |
< |
double T, b, s; |
443 |
> |
double Tdb, b, s; |
444 |
|
double ceiling, trimmings; |
445 |
< |
register int i; |
445 |
> |
int i; |
446 |
|
/* copy initial histogram */ |
447 |
< |
bcopy((char *)bwhist, (char *)modhist, sizeof(modhist)); |
448 |
< |
s = (bwmax - bwmin)/HISTRES; |
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 |
< |
T = mhistot * (bwmax - bwmin) / HISTRES; |
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 = T*clampf(Lb(b)); |
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 > histot*CVRATIO); |
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 |
< |
scotscan(scan, xres) /* apply scotopic color sensitivity loss */ |
474 |
< |
COLOR *scan; |
475 |
< |
int xres; |
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 |
< |
register int i; |
481 |
> |
int i; |
482 |
|
|
483 |
|
for (i = 0; i < xres; i++) { |
484 |
|
Lw = plum(scan[i]); |
503 |
|
} |
504 |
|
|
505 |
|
|
506 |
< |
mapscan(scan, xres) /* apply tone mapping operator to scanline */ |
507 |
< |
COLOR *scan; |
508 |
< |
int xres; |
506 |
> |
void |
507 |
> |
mapscan( /* apply tone mapping operator to scanline */ |
508 |
> |
COLOR *scan, |
509 |
> |
int xres |
510 |
> |
) |
511 |
|
{ |
512 |
|
double mult, Lw, b; |
513 |
< |
register int i; |
513 |
> |
int x; |
514 |
|
|
515 |
< |
for (i = 0; i < xres; i++) { |
516 |
< |
Lw = plum(scan[i]); |
515 |
> |
for (x = 0; x < xres; x++) { |
516 |
> |
Lw = plum(scan[x]); |
517 |
|
if (Lw < LMIN) { |
518 |
< |
setcolor(scan[i], 0., 0., 0.); |
518 |
> |
setcolor(scan[x], 0., 0., 0.); |
519 |
|
continue; |
520 |
|
} |
521 |
< |
b = BLw(Lw); |
522 |
< |
mult = (Lb(b) - ldmin)/(ldmax - ldmin) / (Lw*inpexp); |
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[i], mult); |
524 |
> |
scalecolor(scan[x], mult); |
525 |
|
} |
526 |
|
} |
527 |
|
|
528 |
|
|
529 |
< |
putmapping(fp) /* put out mapping function */ |
530 |
< |
FILE *fp; |
529 |
> |
void |
530 |
> |
putmapping( /* put out mapping function */ |
531 |
> |
FILE *fp |
532 |
> |
) |
533 |
|
{ |
534 |
|
double b, s; |
535 |
< |
register int i; |
535 |
> |
int i; |
536 |
|
double wlum, sf, dlum; |
537 |
|
|
538 |
|
sf = scalef*inpexp; |