| 1 |
– |
/* Copyright (c) 1996 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 pixels allowed > env. */ |
| 14 |
> |
#define CVRATIO 0.025 /* fraction of samples allowed > env. */ |
| 15 |
|
|
| 16 |
< |
#define BotMesopic 5.62e-3 /* top of scotopic range */ |
| 17 |
< |
#define TopMesopic 5.62 /* bottom of photopic range */ |
| 16 |
> |
#define LN_10 2.30258509299404568402 |
| 17 |
> |
#define exp10(x) exp(LN_10*(x)) |
| 18 |
|
|
| 19 |
< |
#define exp10(x) exp(2.302585093*(x)) |
| 19 |
> |
double modhist[HISTRES]; /* modified histogram */ |
| 20 |
> |
double mhistot; /* modified histogram total */ |
| 21 |
> |
double cumf[HISTRES+1]; /* cumulative distribution function */ |
| 22 |
|
|
| 23 |
< |
int modhist[HISTRES]; /* modified histogram */ |
| 24 |
< |
float cumf[HISTRES+1]; /* cumulative distribution function */ |
| 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 |
|
|
| 33 |
< |
mkcumf() /* make cumulative distribution function */ |
| 33 |
> |
|
| 34 |
> |
void |
| 35 |
> |
getfixations( /* load fixation history list */ |
| 36 |
> |
FILE *fp |
| 37 |
> |
) |
| 38 |
|
{ |
| 39 |
< |
register int i; |
| 40 |
< |
register long sum; |
| 39 |
> |
#define FIXHUNK 128 |
| 40 |
> |
RESOLU fvres; |
| 41 |
> |
int pos[2]; |
| 42 |
> |
int px, py, i; |
| 43 |
> |
/* initialize our resolution struct */ |
| 44 |
> |
if ((fvres.rt=inpres.rt)&YMAJOR) { |
| 45 |
> |
fvres.xr = fvxr; |
| 46 |
> |
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) { |
| 53 |
> |
/* convert to closest index in foveal image */ |
| 54 |
> |
loc2pix(pos, &fvres, |
| 55 |
> |
(pos[0]+.5)/inpres.xr, (pos[1]+.5)/inpres.yr); |
| 56 |
> |
/* include nine neighborhood samples */ |
| 57 |
> |
for (px = pos[0]-1; px <= pos[0]+1; px++) { |
| 58 |
> |
if (px < 0 || px >= fvxr) |
| 59 |
> |
continue; |
| 60 |
> |
for (py = pos[1]-1; py <= pos[1]+1; py++) { |
| 61 |
> |
if (py < 0 || py >= fvyr) |
| 62 |
> |
continue; |
| 63 |
> |
for (i = nfixations; i-- > 0; ) |
| 64 |
> |
if (fixlst[i][0] == px && |
| 65 |
> |
fixlst[i][1] == py) |
| 66 |
> |
break; |
| 67 |
> |
if (i >= 0) |
| 68 |
> |
continue; /* already there */ |
| 69 |
> |
if (nfixations % FIXHUNK == 0) { |
| 70 |
> |
if (nfixations) |
| 71 |
> |
fixlst = (short (*)[2]) |
| 72 |
> |
realloc((void *)fixlst, |
| 73 |
> |
(nfixations+FIXHUNK)* |
| 74 |
> |
2*sizeof(short)); |
| 75 |
> |
else |
| 76 |
> |
fixlst = (short (*)[2])malloc( |
| 77 |
> |
FIXHUNK*2*sizeof(short) |
| 78 |
> |
); |
| 79 |
> |
if (fixlst == NULL) |
| 80 |
> |
syserror("malloc"); |
| 81 |
> |
} |
| 82 |
> |
fixlst[nfixations][0] = px; |
| 83 |
> |
fixlst[nfixations][1] = py; |
| 84 |
> |
nfixations++; |
| 85 |
> |
} |
| 86 |
> |
} |
| 87 |
> |
} |
| 88 |
> |
if (!feof(fp)) { |
| 89 |
> |
fprintf(stderr, "%s: format error reading fixation data\n", |
| 90 |
> |
progname); |
| 91 |
> |
exit(1); |
| 92 |
> |
} |
| 93 |
> |
#undef FIXHUNK |
| 94 |
> |
} |
| 95 |
|
|
| 96 |
< |
cumf[0] = 0.; |
| 97 |
< |
sum = modhist[0]; |
| 98 |
< |
for (i = 1; i < HISTRES; i++) { |
| 99 |
< |
cumf[i] = (double)sum/histot; |
| 96 |
> |
|
| 97 |
> |
void |
| 98 |
> |
gethisto( /* load precomputed luminance histogram */ |
| 99 |
> |
FILE *fp |
| 100 |
> |
) |
| 101 |
> |
{ |
| 102 |
> |
double histo[MAXPREHIST]; |
| 103 |
> |
double histart, histep; |
| 104 |
> |
double b, lastb, w; |
| 105 |
> |
int n; |
| 106 |
> |
int i; |
| 107 |
> |
/* load data */ |
| 108 |
> |
for (i = 0; i < MAXPREHIST && |
| 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 |
> |
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)) { |
| 126 |
> |
fprintf(stderr, |
| 127 |
> |
"%s: format/length error loading histogram (log10L %f at %d)\n", |
| 128 |
> |
progname, b, i); |
| 129 |
> |
exit(1); |
| 130 |
> |
} |
| 131 |
> |
n = i; |
| 132 |
> |
histart *= LN_10; |
| 133 |
> |
histep *= LN_10; |
| 134 |
> |
/* find extrema */ |
| 135 |
> |
for (i = 0; i < n && histo[i] <= FTINY; i++) |
| 136 |
> |
; |
| 137 |
> |
bwmin = histart + (i-.001)*histep; |
| 138 |
> |
for (i = n; i-- && histo[i] <= FTINY; ) |
| 139 |
> |
; |
| 140 |
> |
bwmax = histart + (i+1.001)*histep; |
| 141 |
> |
if (bwmax > Bl(LMAX)) |
| 142 |
> |
bwmax = Bl(LMAX); |
| 143 |
> |
if (bwmin < Bl(LMIN)) |
| 144 |
> |
bwmin = Bl(LMIN); |
| 145 |
> |
else /* duplicate bottom bin */ |
| 146 |
> |
bwmin = bwmax - (bwmax-bwmin)*HISTRES/(HISTRES-1); |
| 147 |
> |
/* convert histogram */ |
| 148 |
> |
bwavg = 0.; histot = 0.; |
| 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+FTINY) continue; |
| 153 |
> |
if (b >= bwmax-FTINY) break; |
| 154 |
> |
w = histo[i]; |
| 155 |
> |
bwavg += w*b; |
| 156 |
> |
bwhist[bwhi(b)] += w; |
| 157 |
> |
histot += w; |
| 158 |
> |
} |
| 159 |
> |
bwavg /= histot; |
| 160 |
> |
if (bwmin > Bl(LMIN)+FTINY) { /* add false samples at bottom */ |
| 161 |
> |
bwhist[1] *= 0.5; |
| 162 |
> |
bwhist[0] += bwhist[1]; |
| 163 |
> |
} |
| 164 |
> |
} |
| 165 |
> |
|
| 166 |
> |
|
| 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 */ |
| 175 |
> |
xr = (x - .5*(fvxr-1))/90.; /* 180 degree fisheye has fv?r == 90 */ |
| 176 |
> |
yr = (y - .5*(fvyr-1))/90.; |
| 177 |
> |
p = 1. - xr*xr - yr*yr; |
| 178 |
> |
return(p < 0. ? 0. : p); |
| 179 |
> |
} |
| 180 |
> |
|
| 181 |
> |
|
| 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 && freadcolrs(cscan, x=scanlen(&inpres), infp) < 0) { |
| 200 |
> |
fprintf(stderr, "%s: %s: scanline read error\n", |
| 201 |
> |
progname, infn); |
| 202 |
> |
exit(1); |
| 203 |
> |
} |
| 204 |
> |
rval = frandom(); /* random distance to next sample */ |
| 205 |
> |
while ((cumprob += (1.-cumprob)*n/(npleft-sv)) < rval) |
| 206 |
> |
sv++; |
| 207 |
> |
if (x < ++sv) { /* out of pixels in this scanline */ |
| 208 |
> |
npleft -= x; |
| 209 |
> |
x = 0; |
| 210 |
> |
continue; |
| 211 |
> |
} |
| 212 |
> |
x -= sv; |
| 213 |
> |
colr_color(col, cscan[x]); |
| 214 |
> |
ls[--n] = plum(col); |
| 215 |
> |
npleft -= sv; |
| 216 |
> |
} |
| 217 |
> |
free(cscan); /* clean up and reset file pointer */ |
| 218 |
> |
if (fseek(infp, startpos, SEEK_SET) < 0) |
| 219 |
> |
syserror("fseek"); |
| 220 |
> |
return(ls); |
| 221 |
> |
} |
| 222 |
> |
|
| 223 |
> |
|
| 224 |
> |
void |
| 225 |
> |
comphist(void) /* create foveal sampling histogram */ |
| 226 |
> |
{ |
| 227 |
> |
double l, b, w, lwmin, lwmax; |
| 228 |
> |
float *lumsamp; |
| 229 |
> |
int nlumsamp; |
| 230 |
> |
int x, y; |
| 231 |
> |
/* check for precalculated histogram */ |
| 232 |
> |
if (what2do&DO_PREHIST) |
| 233 |
> |
return; |
| 234 |
> |
lwmin = 1e10; /* find extrema */ |
| 235 |
> |
lwmax = 0.; |
| 236 |
> |
for (y = 0; y < fvyr; y++) |
| 237 |
> |
for (x = 0; x < fvxr; x++) { |
| 238 |
> |
l = plum(fovscan(y)[x]); |
| 239 |
> |
if (l < lwmin) lwmin = l; |
| 240 |
> |
if (l > lwmax) lwmax = l; |
| 241 |
> |
} |
| 242 |
> |
/* sample luminance pixels */ |
| 243 |
> |
nlumsamp = fvxr*fvyr*16; |
| 244 |
> |
if (nlumsamp > inpres.xr*inpres.yr) |
| 245 |
> |
nlumsamp = inpres.xr*inpres.yr; |
| 246 |
> |
lumsamp = getlumsamp(nlumsamp); |
| 247 |
> |
for (x = nlumsamp; x--; ) { |
| 248 |
> |
l = lumsamp[x]; |
| 249 |
> |
if (l < lwmin) lwmin = l; |
| 250 |
> |
if (l > lwmax) lwmax = l; |
| 251 |
> |
} |
| 252 |
> |
lwmax *= 1.01; |
| 253 |
> |
if (lwmax > LMAX) |
| 254 |
> |
lwmax = LMAX; |
| 255 |
> |
bwmax = Bl(lwmax); |
| 256 |
> |
if (lwmin < LMIN) { |
| 257 |
> |
lwmin = LMIN; |
| 258 |
> |
bwmin = Bl(LMIN); |
| 259 |
> |
} else { /* duplicate bottom bin */ |
| 260 |
> |
bwmin = bwmax - (bwmax-Bl(lwmin))*HISTRES/(HISTRES-1); |
| 261 |
> |
lwmin = Lb(bwmin); |
| 262 |
> |
} |
| 263 |
> |
/* (re)compute histogram */ |
| 264 |
> |
bwavg = 0.; |
| 265 |
> |
histot = 0.; |
| 266 |
> |
memset(bwhist, 0, sizeof(bwhist)); |
| 267 |
> |
/* global average */ |
| 268 |
> |
if (!(what2do&DO_FIXHIST) || fixfrac < 1.-FTINY) { |
| 269 |
> |
for (y = 0; y < fvyr; y++) |
| 270 |
> |
for (x = 0; x < fvxr; x++) { |
| 271 |
> |
l = plum(fovscan(y)[x]); |
| 272 |
> |
if (l < lwmin+FTINY) continue; |
| 273 |
> |
if (l >= lwmax-FTINY) continue; |
| 274 |
> |
b = Bl(l); |
| 275 |
> |
w = what2do&DO_CWEIGHT ? centprob(x,y) : 1.; |
| 276 |
> |
bwavg += w*b; |
| 277 |
> |
bwhist[bwhi(b)] += w; |
| 278 |
> |
histot += w; |
| 279 |
> |
} |
| 280 |
> |
/* weight for point luminances */ |
| 281 |
> |
w = 1. * histot / nlumsamp; |
| 282 |
> |
for (x = nlumsamp; x--; ) { |
| 283 |
> |
l = lumsamp[x]; |
| 284 |
> |
if (l < lwmin+FTINY) continue; |
| 285 |
> |
if (l >= lwmax-FTINY) continue; |
| 286 |
> |
b = Bl(l); |
| 287 |
> |
bwavg += w*b; |
| 288 |
> |
bwhist[bwhi(b)] += w; |
| 289 |
> |
histot += w; |
| 290 |
> |
} |
| 291 |
> |
} |
| 292 |
> |
/* average fixation points */ |
| 293 |
> |
if (what2do&DO_FIXHIST && nfixations > 0) { |
| 294 |
> |
if (histot > FTINY) |
| 295 |
> |
w = fixfrac/(1.-fixfrac)*histot/nfixations; |
| 296 |
> |
else |
| 297 |
> |
w = 1.; |
| 298 |
> |
for (x = 0; x < nfixations; x++) { |
| 299 |
> |
l = plum(fovscan(fixlst[x][1])[fixlst[x][0]]); |
| 300 |
> |
if (l < lwmin+FTINY) continue; |
| 301 |
> |
if (l >= lwmax-FTINY) continue; |
| 302 |
> |
b = Bl(l); |
| 303 |
> |
bwavg += w*b; |
| 304 |
> |
bwhist[bwhi(b)] += w; |
| 305 |
> |
histot += w; |
| 306 |
> |
} |
| 307 |
> |
} |
| 308 |
> |
bwavg /= histot; |
| 309 |
> |
if (lwmin > LMIN+FTINY) { /* add false samples at bottom */ |
| 310 |
> |
bwhist[1] *= 0.5; |
| 311 |
> |
bwhist[0] += bwhist[1]; |
| 312 |
> |
} |
| 313 |
> |
free(lumsamp); |
| 314 |
> |
} |
| 315 |
> |
|
| 316 |
> |
|
| 317 |
> |
static void |
| 318 |
> |
mkcumf(void) /* make cumulative distribution function */ |
| 319 |
> |
{ |
| 320 |
> |
int i; |
| 321 |
> |
double sum; |
| 322 |
> |
|
| 323 |
> |
mhistot = 0.; /* compute modified total */ |
| 324 |
> |
for (i = 0; i < HISTRES; i++) |
| 325 |
> |
mhistot += modhist[i]; |
| 326 |
> |
|
| 327 |
> |
sum = 0.; /* compute cumulative function */ |
| 328 |
> |
for (i = 0; i < HISTRES; i++) { |
| 329 |
> |
cumf[i] = sum/mhistot; |
| 330 |
|
sum += modhist[i]; |
| 331 |
|
} |
| 332 |
|
cumf[HISTRES] = 1.; |
| 333 |
|
} |
| 334 |
|
|
| 335 |
|
|
| 336 |
< |
double |
| 337 |
< |
cf(b) /* return cumulative function at b */ |
| 338 |
< |
double b; |
| 336 |
> |
static double |
| 337 |
> |
cf( /* return cumulative function at b */ |
| 338 |
> |
double b |
| 339 |
> |
) |
| 340 |
|
{ |
| 341 |
|
double x; |
| 342 |
< |
register int i; |
| 342 |
> |
int i; |
| 343 |
|
|
| 344 |
|
i = x = HISTRES*(b - bwmin)/(bwmax - bwmin); |
| 345 |
|
x -= (double)i; |
| 347 |
|
} |
| 348 |
|
|
| 349 |
|
|
| 350 |
< |
double |
| 351 |
< |
BLw(Lw) /* map world luminance to display brightness */ |
| 352 |
< |
double Lw; |
| 350 |
> |
static double |
| 351 |
> |
BLw( /* map world luminance to display brightness */ |
| 352 |
> |
double Lw |
| 353 |
> |
) |
| 354 |
|
{ |
| 355 |
|
double b; |
| 356 |
|
|
| 358 |
|
return(Bldmin); |
| 359 |
|
if (b >= bwmax-FTINY) |
| 360 |
|
return(Bldmax); |
| 361 |
< |
return(Bldmin + cf(Bl(Lw))*(Bldmax-Bldmin)); |
| 361 |
> |
return(Bldmin + cf(b)*(Bldmax-Bldmin)); |
| 362 |
|
} |
| 363 |
|
|
| 364 |
|
|
| 365 |
|
double |
| 366 |
< |
htcontrs(La) /* human threshold contrast sensitivity, dL(La) */ |
| 367 |
< |
double La; |
| 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] */ |
| 386 |
|
|
| 387 |
|
|
| 388 |
|
double |
| 389 |
< |
clampf(Lw) /* derivative clamping function */ |
| 390 |
< |
double Lw; |
| 389 |
> |
clampf( /* histogram clamping function */ |
| 390 |
> |
double Lw |
| 391 |
> |
) |
| 392 |
|
{ |
| 393 |
|
double bLw, ratio; |
| 394 |
|
|
| 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 |
< |
int |
| 409 |
< |
shiftdir(bw) /* compute shift direction for histogram */ |
| 410 |
< |
double bw; |
| 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 |
< |
if (what2do&DO_HSENS && cf(bw) - (bw - bwmin)/(Bldmax - bwmin)) |
| 424 |
< |
return(1); |
| 425 |
< |
return(-1); |
| 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() /* make dynamic range map */ |
| 440 |
> |
mkbrmap(void) /* make dynamic range map */ |
| 441 |
|
{ |
| 442 |
< |
int hdiffs[HISTRES], above, below; |
| 443 |
< |
double T, b, s; |
| 444 |
< |
int maxd, maxi, sd; |
| 117 |
< |
register int i; |
| 442 |
> |
double Tdb, b, s; |
| 443 |
> |
double ceiling, trimmings; |
| 444 |
> |
int i; |
| 445 |
|
/* copy initial histogram */ |
| 446 |
< |
for (i = 0; i < HISTRES; i++) |
| 447 |
< |
modhist[i] = bwhist[i]; |
| 121 |
< |
T = histot * (bwmax - bwmin) / HISTRES; |
| 122 |
< |
s = (bwmax - bwmin)/HISTRES; |
| 446 |
> |
memcpy((void *)modhist, (void *)bwhist, sizeof(modhist)); |
| 447 |
> |
s = (bwmax - bwmin)/HISTRES; /* s is delta b */ |
| 448 |
|
/* loop until satisfactory */ |
| 449 |
< |
for ( ; ; ) { |
| 450 |
< |
mkcumf(); /* sync brightness mapping */ |
| 451 |
< |
above = below = 0; /* compute visibility overflow */ |
| 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 |
< |
hdiffs[i] = modhist[i] - (int)(T*clampf(Lb(b)) + .5); |
| 457 |
< |
if (hdiffs[i] > 0) above += hdiffs[i]; |
| 458 |
< |
else below -= hdiffs[i]; |
| 456 |
> |
ceiling = Tdb*clampf(Lb(b)); |
| 457 |
> |
if (modhist[i] > ceiling) { |
| 458 |
> |
trimmings += modhist[i] - ceiling; |
| 459 |
> |
modhist[i] = ceiling; |
| 460 |
> |
} |
| 461 |
|
} |
| 462 |
< |
if (above <= histot*CVRATIO) |
| 463 |
< |
break; /* close enough */ |
| 464 |
< |
if (above-below >= 0) |
| 465 |
< |
return(-1); /* Houston, we have a problem.... */ |
| 466 |
< |
/* original looped here as well (BEGIN_L2) */ |
| 467 |
< |
maxd = 0; /* find largest overvis */ |
| 468 |
< |
for (i = 0; i < HISTRES; i++) |
| 139 |
< |
if (hdiffs[i] > maxd) |
| 140 |
< |
maxd = hdiffs[maxi=i]; |
| 141 |
< |
/* broke loop here when (maxd == 0) (BREAK_L2) */ |
| 142 |
< |
for (sd = shiftdir((maxi+.5)/HISTRES*(bwmax-bwmin)+bwmin); |
| 143 |
< |
hdiffs[maxi] == maxd; sd = -sd) |
| 144 |
< |
for (i = maxi+sd; i >= 0 & i < HISTRES; i += sd) |
| 145 |
< |
if (hdiffs[i] < 0) { |
| 146 |
< |
if (hdiffs[i] <= -maxd) { |
| 147 |
< |
modhist[i] += maxd; |
| 148 |
< |
modhist[maxi] -= maxd; |
| 149 |
< |
hdiffs[i] += maxd; |
| 150 |
< |
hdiffs[maxi] = 0; |
| 151 |
< |
} else { |
| 152 |
< |
modhist[maxi] += hdiffs[i]; |
| 153 |
< |
modhist[i] -= hdiffs[i]; |
| 154 |
< |
hdiffs[maxi] += hdiffs[i]; |
| 155 |
< |
hdiffs[i] = 0; |
| 156 |
< |
} |
| 157 |
< |
break; |
| 158 |
< |
} |
| 159 |
< |
/* (END_L2) */ |
| 160 |
< |
} |
| 161 |
< |
return(0); |
| 462 |
> |
} while (trimmings > mhistot*CVRATIO); |
| 463 |
> |
|
| 464 |
> |
#if ADJ_VEIL |
| 465 |
> |
mkcrfimage(); /* contrast reduction image */ |
| 466 |
> |
#endif |
| 467 |
> |
|
| 468 |
> |
return(0); /* we got it */ |
| 469 |
|
} |
| 470 |
|
|
| 471 |
|
|
| 472 |
< |
scotscan(scan, xres) /* apply scotopic color sensitivity loss */ |
| 473 |
< |
COLOR *scan; |
| 474 |
< |
int xres; |
| 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 |
< |
register int i; |
| 480 |
> |
int i; |
| 481 |
|
|
| 482 |
|
for (i = 0; i < xres; i++) { |
| 483 |
|
Lw = plum(scan[i]); |
| 502 |
|
} |
| 503 |
|
|
| 504 |
|
|
| 505 |
< |
mapscan(scan, xres) /* apply tone mapping operator to scanline */ |
| 506 |
< |
COLOR *scan; |
| 507 |
< |
int xres; |
| 505 |
> |
void |
| 506 |
> |
mapscan( /* apply tone mapping operator to scanline */ |
| 507 |
> |
COLOR *scan, |
| 508 |
> |
int xres |
| 509 |
> |
) |
| 510 |
|
{ |
| 511 |
|
double mult, Lw, b; |
| 512 |
< |
register int i; |
| 512 |
> |
int x; |
| 513 |
|
|
| 514 |
< |
for (i = 0; i < xres; i++) { |
| 515 |
< |
Lw = plum(scan[i]); |
| 514 |
> |
for (x = 0; x < xres; x++) { |
| 515 |
> |
Lw = plum(scan[x]); |
| 516 |
|
if (Lw < LMIN) { |
| 517 |
< |
setcolor(scan[i], 0., 0., 0.); |
| 517 |
> |
setcolor(scan[x], 0., 0., 0.); |
| 518 |
|
continue; |
| 519 |
|
} |
| 520 |
< |
b = BLw(Lw); |
| 521 |
< |
mult = (Lb(b) - ldmin)/(ldmax - ldmin) / (Lw*inpexp); |
| 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[i], mult); |
| 523 |
> |
scalecolor(scan[x], mult); |
| 524 |
|
} |
| 525 |
|
} |
| 526 |
|
|
| 527 |
|
|
| 528 |
< |
#ifdef DEBUG |
| 529 |
< |
doplots() /* generate debugging plots */ |
| 528 |
> |
void |
| 529 |
> |
putmapping( /* put out mapping function */ |
| 530 |
> |
FILE *fp |
| 531 |
> |
) |
| 532 |
|
{ |
| 533 |
< |
double T, b, s; |
| 534 |
< |
FILE *fp; |
| 535 |
< |
char fname[128]; |
| 223 |
< |
register int i; |
| 533 |
> |
double b, s; |
| 534 |
> |
int i; |
| 535 |
> |
double wlum, sf, dlum; |
| 536 |
|
|
| 537 |
< |
T = histot * (bwmax - bwmin) / HISTRES; |
| 537 |
> |
sf = scalef*inpexp; |
| 538 |
> |
if (lumf == cielum) sf *= WHTEFFICACY; |
| 539 |
|
s = (bwmax - bwmin)/HISTRES; |
| 540 |
< |
|
| 541 |
< |
sprintf(fname, "%s_hist.plt", infn); |
| 542 |
< |
if ((fp = fopen(fname, "w")) == NULL) |
| 543 |
< |
syserror(fname); |
| 544 |
< |
fputs("include=curve.plt\n", fp); |
| 545 |
< |
fputs("title=\"Brightness Frequency Distribution\"\n", fp); |
| 546 |
< |
fprintf(fp, "subtitle=%s\n", infn); |
| 547 |
< |
fputs("ymin=0\n", fp); |
| 548 |
< |
fputs("xlabel=\"Perceptual Brightness B(Lw)\"\n", fp); |
| 549 |
< |
fputs("ylabel=\"Frequency Count\"\n", fp); |
| 237 |
< |
fputs("Alabel=\"Histogram\"\n", fp); |
| 238 |
< |
fputs("Alintype=0\n", fp); |
| 239 |
< |
fputs("Blabel=\"Envelope\"\n", fp); |
| 240 |
< |
fputs("Bsymsize=0\n", fp); |
| 241 |
< |
fputs("Adata=\n", fp); |
| 242 |
< |
for (i = 0, b = bwmin + .5*s; i < HISTRES; i++, b += s) |
| 243 |
< |
fprintf(fp, "\t%f %d\n", b, modhist[i]); |
| 244 |
< |
fputs(";\nBdata=\n", fp); |
| 245 |
< |
for (i = 0, b = bwmin + .5*s; i < HISTRES; i++, b += s) |
| 246 |
< |
fprintf(fp, "\t%f %f\n", b, T*clampf(Lb(b))); |
| 247 |
< |
fputs(";\n", fp); |
| 248 |
< |
fclose(fp); |
| 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 |
|
} |
| 250 |
– |
#endif |
