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 |
|
|
12 |
|
|
15 |
|
#define LN_10 2.30258509299404568402 |
16 |
|
#define exp10(x) exp(LN_10*(x)) |
17 |
|
|
18 |
< |
float modhist[HISTRES]; /* modified histogram */ |
18 |
> |
double modhist[HISTRES]; /* modified histogram */ |
19 |
|
double mhistot; /* modified histogram total */ |
20 |
< |
float cumf[HISTRES+1]; /* cumulative distribution function */ |
20 |
> |
double cumf[HISTRES+1]; /* cumulative distribution function */ |
21 |
|
|
22 |
+ |
static double centprob(int x, int y); |
23 |
+ |
static void mkcumf(void); |
24 |
+ |
static double cf(double b); |
25 |
+ |
static double BLw(double Lw); |
26 |
+ |
#if ADJ_VEIL |
27 |
+ |
static void mkcrfimage(void); |
28 |
+ |
#endif |
29 |
|
|
30 |
< |
getfixations(fp) /* load fixation history list */ |
31 |
< |
FILE *fp; |
30 |
> |
|
31 |
> |
|
32 |
> |
void |
33 |
> |
getfixations( /* load fixation history list */ |
34 |
> |
FILE *fp |
35 |
> |
) |
36 |
|
{ |
37 |
|
#define FIXHUNK 128 |
38 |
|
RESOLU fvres; |
39 |
|
int pos[2]; |
40 |
< |
register int px, py, i; |
40 |
> |
int px, py, i; |
41 |
|
/* initialize our resolution struct */ |
42 |
< |
if ((fvres.or=inpres.or)&YMAJOR) { |
42 |
> |
if ((fvres.rt=inpres.rt)&YMAJOR) { |
43 |
|
fvres.xr = fvxr; |
44 |
|
fvres.yr = fvyr; |
45 |
|
} else { |
67 |
|
if (nfixations % FIXHUNK == 0) { |
68 |
|
if (nfixations) |
69 |
|
fixlst = (short (*)[2]) |
70 |
< |
realloc((char *)fixlst, |
70 |
> |
realloc((void *)fixlst, |
71 |
|
(nfixations+FIXHUNK)* |
72 |
|
2*sizeof(short)); |
73 |
|
else |
92 |
|
} |
93 |
|
|
94 |
|
|
95 |
< |
gethisto(fp) /* load precomputed luminance histogram */ |
96 |
< |
FILE *fp; |
95 |
> |
void |
96 |
> |
gethisto( /* load precomputed luminance histogram */ |
97 |
> |
FILE *fp |
98 |
> |
) |
99 |
|
{ |
100 |
< |
float histo[MAXPREHIST]; |
100 |
> |
double histo[MAXPREHIST]; |
101 |
|
double histart, histep; |
102 |
< |
double l, b, lastb, w; |
102 |
> |
double b, lastb, w; |
103 |
|
int n; |
104 |
< |
register int i; |
104 |
> |
int i; |
105 |
|
/* load data */ |
106 |
|
for (i = 0; i < MAXPREHIST && |
107 |
< |
fscanf(fp, "%lf %f", &b, &histo[i]) == 2; i++) { |
108 |
< |
if (i > 1 && fabs(b - lastb - histep) > 1e-3) { |
107 |
> |
fscanf(fp, "%lf %lf", &b, &histo[i]) == 2; i++) { |
108 |
> |
if (i > 1 && fabs(b - lastb - histep) > .001) { |
109 |
|
fprintf(stderr, |
110 |
|
"%s: uneven step size in histogram data\n", |
111 |
|
progname); |
112 |
|
exit(1); |
113 |
|
} |
114 |
|
if (i == 1) |
115 |
< |
histep = b - (histart = lastb); |
115 |
> |
if ((histep = b - (histart = lastb)) <= FTINY) { |
116 |
> |
fprintf(stderr, |
117 |
> |
"%s: illegal step in histogram data\n", |
118 |
> |
progname); |
119 |
> |
exit(1); |
120 |
> |
} |
121 |
|
lastb = b; |
122 |
|
} |
123 |
|
if (i < 2 || !feof(fp)) { |
132 |
|
/* find extrema */ |
133 |
|
for (i = 0; i < n && histo[i] <= FTINY; i++) |
134 |
|
; |
135 |
< |
bwmin = histart + i*histep; |
135 |
> |
bwmin = histart + (i-.001)*histep; |
136 |
|
for (i = n; i-- && histo[i] <= FTINY; ) |
137 |
|
; |
138 |
< |
bwmax = histart + i*histep; |
138 |
> |
bwmax = histart + (i+1.001)*histep; |
139 |
|
if (bwmax > Bl(LMAX)) |
140 |
|
bwmax = Bl(LMAX); |
141 |
|
if (bwmin < Bl(LMIN)) |
147 |
|
for (i = 0; i < HISTRES; i++) |
148 |
|
bwhist[i] = 0.; |
149 |
|
for (i = 0, b = histart; i < n; i++, b += histep) { |
150 |
< |
if (b < bwmin) continue; |
151 |
< |
if (b > bwmax) break; |
150 |
> |
if (b < bwmin+FTINY) continue; |
151 |
> |
if (b >= bwmax-FTINY) break; |
152 |
|
w = histo[i]; |
153 |
|
bwavg += w*b; |
154 |
|
bwhist[bwhi(b)] += w; |
162 |
|
} |
163 |
|
|
164 |
|
|
165 |
< |
double |
166 |
< |
centprob(x, y) /* center-weighting probability function */ |
167 |
< |
int x, y; |
165 |
> |
static double |
166 |
> |
centprob( /* center-weighting probability function */ |
167 |
> |
int x, |
168 |
> |
int y |
169 |
> |
) |
170 |
|
{ |
171 |
|
double xr, yr, p; |
172 |
|
/* paraboloid, 0 at 90 degrees from center */ |
177 |
|
} |
178 |
|
|
179 |
|
|
180 |
< |
comphist() /* create foveal sampling histogram */ |
180 |
> |
void |
181 |
> |
comphist(void) /* create foveal sampling histogram */ |
182 |
|
{ |
183 |
|
double l, b, w, lwmin, lwmax; |
184 |
< |
register int x, y; |
184 |
> |
int x, y; |
185 |
|
/* check for precalculated histogram */ |
186 |
|
if (what2do&DO_PREHIST) |
187 |
|
return; |
190 |
|
for (y = 0; y < fvyr; y++) |
191 |
|
for (x = 0; x < fvxr; x++) { |
192 |
|
l = plum(fovscan(y)[x]); |
193 |
< |
if (l < lwmin) lwmin = l; |
194 |
< |
if (l > lwmax) lwmax = l; |
193 |
> |
if ((l < lwmin) & (l > LMIN)) lwmin = l; |
194 |
> |
if ((l > lwmax) & (l < LMAX)) lwmax = l; |
195 |
|
} |
196 |
|
lwmax *= 1.01; |
197 |
|
if (lwmax > LMAX) |
214 |
|
for (y = 0; y < fvyr; y++) |
215 |
|
for (x = 0; x < fvxr; x++) { |
216 |
|
l = plum(fovscan(y)[x]); |
217 |
< |
if (l < lwmin) continue; |
218 |
< |
if (l > lwmax) continue; |
217 |
> |
if (l < lwmin+FTINY) continue; |
218 |
> |
if (l >= lwmax-FTINY) continue; |
219 |
|
b = Bl(l); |
220 |
|
w = what2do&DO_CWEIGHT ? centprob(x,y) : 1.; |
221 |
|
bwavg += w*b; |
230 |
|
w = 1.; |
231 |
|
for (x = 0; x < nfixations; x++) { |
232 |
|
l = plum(fovscan(fixlst[x][1])[fixlst[x][0]]); |
233 |
< |
if (l < lwmin) continue; |
234 |
< |
if (l > lwmax) continue; |
233 |
> |
if (l < lwmin+FTINY) continue; |
234 |
> |
if (l >= lwmax-FTINY) continue; |
235 |
|
b = Bl(l); |
236 |
|
bwavg += w*b; |
237 |
|
bwhist[bwhi(b)] += w; |
246 |
|
} |
247 |
|
|
248 |
|
|
249 |
< |
mkcumf() /* make cumulative distribution function */ |
249 |
> |
static void |
250 |
> |
mkcumf(void) /* make cumulative distribution function */ |
251 |
|
{ |
252 |
< |
register int i; |
253 |
< |
register double sum; |
252 |
> |
int i; |
253 |
> |
double sum; |
254 |
|
|
255 |
|
mhistot = 0.; /* compute modified total */ |
256 |
|
for (i = 0; i < HISTRES; i++) |
265 |
|
} |
266 |
|
|
267 |
|
|
268 |
< |
double |
269 |
< |
cf(b) /* return cumulative function at b */ |
270 |
< |
double b; |
268 |
> |
static double |
269 |
> |
cf( /* return cumulative function at b */ |
270 |
> |
double b |
271 |
> |
) |
272 |
|
{ |
273 |
|
double x; |
274 |
< |
register int i; |
274 |
> |
int i; |
275 |
|
|
276 |
|
i = x = HISTRES*(b - bwmin)/(bwmax - bwmin); |
277 |
|
x -= (double)i; |
279 |
|
} |
280 |
|
|
281 |
|
|
282 |
< |
double |
283 |
< |
BLw(Lw) /* map world luminance to display brightness */ |
284 |
< |
double Lw; |
282 |
> |
static double |
283 |
> |
BLw( /* map world luminance to display brightness */ |
284 |
> |
double Lw |
285 |
> |
) |
286 |
|
{ |
287 |
|
double b; |
288 |
|
|
295 |
|
|
296 |
|
|
297 |
|
double |
298 |
< |
htcontrs(La) /* human threshold contrast sensitivity, dL(La) */ |
299 |
< |
double La; |
298 |
> |
htcontrs( /* human threshold contrast sensitivity, dL(La) */ |
299 |
> |
double La |
300 |
> |
) |
301 |
|
{ |
302 |
|
double l10La, l10dL; |
303 |
|
/* formula taken from Ferwerda et al. [SG96] */ |
318 |
|
|
319 |
|
|
320 |
|
double |
321 |
< |
clampf(Lw) /* derivative clamping function */ |
322 |
< |
double Lw; |
321 |
> |
clampf( /* histogram clamping function */ |
322 |
> |
double Lw |
323 |
> |
) |
324 |
|
{ |
325 |
|
double bLw, ratio; |
326 |
|
|
329 |
|
return(ratio/(Lb1(bLw)*(Bldmax-Bldmin)*Bl1(Lw))); |
330 |
|
} |
331 |
|
|
332 |
+ |
double |
333 |
+ |
crfactor( /* contrast reduction factor */ |
334 |
+ |
double Lw |
335 |
+ |
) |
336 |
+ |
{ |
337 |
+ |
int i = HISTRES*(Bl(Lw) - bwmin)/(bwmax - bwmin); |
338 |
+ |
double bLw, ratio, Tdb; |
339 |
|
|
340 |
+ |
if (i <= 0) |
341 |
+ |
return(1.0); |
342 |
+ |
if (i >= HISTRES) |
343 |
+ |
return(1.0); |
344 |
+ |
bLw = BLw(Lw); |
345 |
+ |
ratio = what2do&DO_HSENS ? htcontrs(Lb(bLw))/htcontrs(Lw) : Lb(bLw)/Lw; |
346 |
+ |
Tdb = mhistot * (bwmax - bwmin) / HISTRES; |
347 |
+ |
return(modhist[i]*Lb1(bLw)*(Bldmax-Bldmin)*Bl1(Lw)/(Tdb*ratio)); |
348 |
+ |
} |
349 |
+ |
|
350 |
+ |
|
351 |
+ |
#if ADJ_VEIL |
352 |
+ |
static void |
353 |
+ |
mkcrfimage(void) /* compute contrast reduction factor image */ |
354 |
+ |
{ |
355 |
+ |
int i; |
356 |
+ |
float *crfptr; |
357 |
+ |
COLOR *fovptr; |
358 |
+ |
|
359 |
+ |
if (crfimg == NULL) |
360 |
+ |
crfimg = (float *)malloc(fvxr*fvyr*sizeof(float)); |
361 |
+ |
if (crfimg == NULL) |
362 |
+ |
syserror("malloc"); |
363 |
+ |
crfptr = crfimg; |
364 |
+ |
fovptr = fovimg; |
365 |
+ |
for (i = fvxr*fvyr; i--; crfptr++, fovptr++) |
366 |
+ |
crfptr[0] = crfactor(plum(fovptr[0])); |
367 |
+ |
} |
368 |
+ |
#endif |
369 |
+ |
|
370 |
+ |
|
371 |
|
int |
372 |
< |
mkbrmap() /* make dynamic range map */ |
372 |
> |
mkbrmap(void) /* make dynamic range map */ |
373 |
|
{ |
374 |
< |
double T, b, s; |
374 |
> |
double Tdb, b, s; |
375 |
|
double ceiling, trimmings; |
376 |
< |
register int i; |
376 |
> |
int i; |
377 |
|
/* copy initial histogram */ |
378 |
< |
bcopy((char *)bwhist, (char *)modhist, sizeof(modhist)); |
379 |
< |
s = (bwmax - bwmin)/HISTRES; |
378 |
> |
memcpy((void *)modhist, (void *)bwhist, sizeof(modhist)); |
379 |
> |
s = (bwmax - bwmin)/HISTRES; /* s is delta b */ |
380 |
|
/* loop until satisfactory */ |
381 |
|
do { |
382 |
|
mkcumf(); /* sync brightness mapping */ |
383 |
|
if (mhistot <= histot*CVRATIO) |
384 |
|
return(-1); /* no compression needed! */ |
385 |
< |
T = mhistot * (bwmax - bwmin) / HISTRES; |
385 |
> |
Tdb = mhistot * s; |
386 |
|
trimmings = 0.; /* clip to envelope */ |
387 |
|
for (i = 0, b = bwmin + .5*s; i < HISTRES; i++, b += s) { |
388 |
< |
ceiling = T*clampf(Lb(b)); |
388 |
> |
ceiling = Tdb*clampf(Lb(b)); |
389 |
|
if (modhist[i] > ceiling) { |
390 |
|
trimmings += modhist[i] - ceiling; |
391 |
|
modhist[i] = ceiling; |
393 |
|
} |
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 |
> |
void |
405 |
> |
scotscan( /* apply scotopic color sensitivity loss */ |
406 |
> |
COLOR *scan, |
407 |
> |
int xres |
408 |
> |
) |
409 |
|
{ |
410 |
|
COLOR ctmp; |
411 |
|
double incolor, b, Lw; |
412 |
< |
register int i; |
412 |
> |
int i; |
413 |
|
|
414 |
|
for (i = 0; i < xres; i++) { |
415 |
|
Lw = plum(scan[i]); |
434 |
|
} |
435 |
|
|
436 |
|
|
437 |
< |
mapscan(scan, xres) /* apply tone mapping operator to scanline */ |
438 |
< |
COLOR *scan; |
439 |
< |
int xres; |
437 |
> |
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 |
> |
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 |
> |
void |
461 |
> |
putmapping( /* put out mapping function */ |
462 |
> |
FILE *fp |
463 |
> |
) |
464 |
|
{ |
465 |
|
double b, s; |
466 |
< |
register int i; |
466 |
> |
int i; |
467 |
|
double wlum, sf, dlum; |
468 |
|
|
469 |
|
sf = scalef*inpexp; |