1 |
< |
/* Copyright (c) 1996 Regents of the University of California */ |
1 |
> |
/* Copyright (c) 1997 Regents of the University of California */ |
2 |
|
|
3 |
|
#ifndef lint |
4 |
|
static char SCCSid[] = "$SunId$ LBL"; |
10 |
|
|
11 |
|
#include "pcond.h" |
12 |
|
|
13 |
+ |
/************** VEILING STUFF *****************/ |
14 |
|
|
15 |
|
#define VADAPT 0.08 /* fraction of adaptation from veil */ |
16 |
|
|
17 |
< |
extern COLOR *fovimg; /* foveal (1 degree) averaged image */ |
17 |
< |
extern short fvxr, fvyr; /* foveal image resolution */ |
17 |
> |
static COLOR *veilimg = NULL; /* veiling image */ |
18 |
|
|
19 |
– |
#define fovscan(y) (fovimg+(y)*fvxr) |
20 |
– |
|
21 |
– |
static COLOR *veilimg; /* veiling image */ |
22 |
– |
|
19 |
|
#define veilscan(y) (veilimg+(y)*fvxr) |
20 |
|
|
21 |
|
static float (*raydir)[3] = NULL; /* ray direction for each pixel */ |
78 |
|
COLOR ctmp, vsum; |
79 |
|
int px, py; |
80 |
|
register int x, y; |
81 |
+ |
|
82 |
+ |
if (veilimg != NULL) /* already done? */ |
83 |
+ |
return; |
84 |
|
/* compute ray directions */ |
85 |
|
compraydir(); |
86 |
|
/* compute veil image */ |
97 |
|
t2 = DOT(rdirscan(py)[px], |
98 |
|
rdirscan(y)[x]); |
99 |
|
if (t2 <= FTINY) continue; |
100 |
< |
t2 = acos(t2); |
101 |
< |
t2 = 1./(t2*t2); |
100 |
> |
/* use approximation instead |
101 |
> |
t3 = acos(t2); |
102 |
> |
t2 = t2/(t3*t3); |
103 |
> |
*/ |
104 |
> |
t2 *= .5 / (1. - t2); |
105 |
|
copycolor(ctmp, fovscan(y)[x]); |
106 |
|
scalecolor(ctmp, t2); |
107 |
|
addcolor(vsum, ctmp); |
108 |
|
t2sum += t2; |
109 |
|
} |
110 |
|
/* VADAPT of original is subtracted in addveil() */ |
111 |
< |
scalecolor(vsum, VADAPT/t2sum); |
111 |
> |
if (t2sum > FTINY) |
112 |
> |
scalecolor(vsum, VADAPT/t2sum); |
113 |
|
copycolor(veilscan(py)[px], vsum); |
114 |
|
} |
115 |
+ |
/* modify FOV sample image */ |
116 |
+ |
for (y = 0; y < fvyr; y++) |
117 |
+ |
for (x = 0; x < fvxr; x++) { |
118 |
+ |
scalecolor(fovscan(y)[x], 1.-VADAPT); |
119 |
+ |
addcolor(fovscan(y)[x], veilscan(y)[x]); |
120 |
+ |
} |
121 |
+ |
comphist(); /* recompute histogram */ |
122 |
|
} |
123 |
|
|
124 |
|
|
132 |
|
register int x, i; |
133 |
|
|
134 |
|
vy = dy = (y+.5)/numscans(&inpres)*fvyr - .5; |
135 |
< |
if (vy >= fvyr-1) vy--; |
135 |
> |
while (vy >= fvyr-1) vy--; |
136 |
|
dy -= (double)vy; |
137 |
|
for (x = 0; x < scanlen(&inpres); x++) { |
138 |
|
vx = dx = (x+.5)/scanlen(&inpres)*fvxr - .5; |
139 |
< |
if (vx >= fvxr-1) vx--; |
139 |
> |
while (vx >= fvxr-1) vx--; |
140 |
|
dx -= (double)vx; |
141 |
|
for (i = 0; i < 3; i++) { |
142 |
|
lv = (1.-dy)*colval(veilscan(vy)[vx],i) + |
147 |
|
(1.-dx)*lv + dx*uv; |
148 |
|
} |
149 |
|
} |
150 |
+ |
} |
151 |
+ |
|
152 |
+ |
|
153 |
+ |
/****************** ACUITY STUFF *******************/ |
154 |
+ |
|
155 |
+ |
typedef struct { |
156 |
+ |
short sampe; /* sample area size (exponent of 2) */ |
157 |
+ |
short nscans; /* number of scanlines in this bar */ |
158 |
+ |
int len; /* individual scanline length */ |
159 |
+ |
int nread; /* number of scanlines loaded */ |
160 |
+ |
COLOR *sdata; /* scanbar data */ |
161 |
+ |
} SCANBAR; |
162 |
+ |
|
163 |
+ |
#define bscan(sb,y) ((COLOR *)(sb)->sdata+((y)%(sb)->nscans)*(sb)->len) |
164 |
+ |
|
165 |
+ |
SCANBAR *rootbar; /* root scan bar (lowest resolution) */ |
166 |
+ |
|
167 |
+ |
float *inpacuD; /* input acuity data (cycles/degree) */ |
168 |
+ |
|
169 |
+ |
#define tsampr(x,y) inpacuD[(y)*fvxr+(x)] |
170 |
+ |
|
171 |
+ |
|
172 |
+ |
double |
173 |
+ |
hacuity(La) /* return visual acuity in cycles/degree */ |
174 |
+ |
double La; |
175 |
+ |
{ |
176 |
+ |
/* functional fit */ |
177 |
+ |
return(17.25*atan(1.4*log10(La) + 0.35) + 25.72); |
178 |
+ |
} |
179 |
+ |
|
180 |
+ |
|
181 |
+ |
COLOR * |
182 |
+ |
getascan(sb, y) /* find/read scanline y for scanbar sb */ |
183 |
+ |
register SCANBAR *sb; |
184 |
+ |
int y; |
185 |
+ |
{ |
186 |
+ |
register COLOR *sl0, *sl1, *mysl; |
187 |
+ |
register int i; |
188 |
+ |
|
189 |
+ |
if (y < sb->nread - sb->nscans) /* too far back? */ |
190 |
+ |
return(NULL); |
191 |
+ |
for ( ; y >= sb->nread; sb->nread++) { /* read as necessary */ |
192 |
+ |
mysl = bscan(sb, sb->nread); |
193 |
+ |
if (sb->sampe == 0) { |
194 |
+ |
if (freadscan(mysl, sb->len, infp) < 0) { |
195 |
+ |
fprintf(stderr, "%s: %s: scanline read error\n", |
196 |
+ |
progname, infn); |
197 |
+ |
exit(1); |
198 |
+ |
} |
199 |
+ |
} else { |
200 |
+ |
sl0 = getascan(sb+1, 2*y); |
201 |
+ |
if (sl0 == NULL) |
202 |
+ |
return(NULL); |
203 |
+ |
sl1 = getascan(sb+1, 2*y+1); |
204 |
+ |
for (i = 0; i < sb->len; i++) { |
205 |
+ |
copycolor(mysl[i], sl0[2*i]); |
206 |
+ |
addcolor(mysl[i], sl0[2*i+1]); |
207 |
+ |
addcolor(mysl[i], sl1[2*i]); |
208 |
+ |
addcolor(mysl[i], sl1[2*i+1]); |
209 |
+ |
scalecolor(mysl[i], 0.25); |
210 |
+ |
} |
211 |
+ |
} |
212 |
+ |
} |
213 |
+ |
return(bscan(sb, y)); |
214 |
+ |
} |
215 |
+ |
|
216 |
+ |
|
217 |
+ |
acuscan(scln, y) /* get acuity-sampled scanline */ |
218 |
+ |
COLOR *scln; |
219 |
+ |
int y; |
220 |
+ |
{ |
221 |
+ |
double sr; |
222 |
+ |
double dx, dy; |
223 |
+ |
int ix, iy; |
224 |
+ |
register int x; |
225 |
+ |
/* compute foveal y position */ |
226 |
+ |
iy = dy = (y+.5)/numscans(&inpres)*fvyr - .5; |
227 |
+ |
while (iy >= fvyr-1) iy--; |
228 |
+ |
dy -= (double)iy; |
229 |
+ |
for (x = 0; x < scanlen(&inpres); x++) { |
230 |
+ |
/* compute foveal x position */ |
231 |
+ |
ix = dx = (x+.5)/scanlen(&inpres)*fvxr - .5; |
232 |
+ |
while (ix >= fvxr-1) ix--; |
233 |
+ |
dx -= (double)ix; |
234 |
+ |
/* interpolate sample rate */ |
235 |
+ |
sr = (1.-dy)*((1.-dx)*tsampr(ix,iy) + dx*tsampr(ix+1,iy)) + |
236 |
+ |
dy*((1.-dx)*tsampr(ix,iy+1) + dx*tsampr(ix+1,iy+1)); |
237 |
+ |
|
238 |
+ |
acusample(scln[x], x, y, sr); /* compute sample */ |
239 |
+ |
} |
240 |
+ |
} |
241 |
+ |
|
242 |
+ |
|
243 |
+ |
acusample(col, x, y, sr) /* interpolate sample at (x,y) using rate sr */ |
244 |
+ |
COLOR col; |
245 |
+ |
int x, y; |
246 |
+ |
double sr; |
247 |
+ |
{ |
248 |
+ |
COLOR c1; |
249 |
+ |
double d; |
250 |
+ |
register SCANBAR *sb0; |
251 |
+ |
|
252 |
+ |
for (sb0 = rootbar; sb0->sampe != 0 && 1<<sb0[1].sampe > sr; sb0++) |
253 |
+ |
; |
254 |
+ |
ascanval(col, x, y, sb0); |
255 |
+ |
if (sb0->sampe == 0) /* don't extrapolate highest */ |
256 |
+ |
return; |
257 |
+ |
ascanval(c1, x, y, sb0+1); |
258 |
+ |
d = ((1<<sb0->sampe) - sr)/(1<<sb0[1].sampe); |
259 |
+ |
scalecolor(col, 1.-d); |
260 |
+ |
scalecolor(c1, d); |
261 |
+ |
addcolor(col, c1); |
262 |
+ |
} |
263 |
+ |
|
264 |
+ |
|
265 |
+ |
ascanval(col, x, y, sb) /* interpolate scanbar at orig. coords (x,y) */ |
266 |
+ |
COLOR col; |
267 |
+ |
int x, y; |
268 |
+ |
SCANBAR *sb; |
269 |
+ |
{ |
270 |
+ |
COLOR *sl0, *sl1, c1, c1y; |
271 |
+ |
double dx, dy; |
272 |
+ |
int ix, iy; |
273 |
+ |
|
274 |
+ |
if (sb->sampe == 0) { /* no need to interpolate */ |
275 |
+ |
sl0 = getascan(sb, y); |
276 |
+ |
copycolor(col, sl0[x]); |
277 |
+ |
return; |
278 |
+ |
} |
279 |
+ |
/* compute coordinates for sb */ |
280 |
+ |
ix = dx = (x+.5)/(1<<sb->sampe) - .5; |
281 |
+ |
while (ix >= sb->len-1) ix--; |
282 |
+ |
dx -= (double)ix; |
283 |
+ |
iy = dy = (y+.5)/(1<<sb->sampe) - .5; |
284 |
+ |
while (iy >= (numscans(&inpres)>>sb->sampe)-1) iy--; |
285 |
+ |
dy -= (double)iy; |
286 |
+ |
/* get scanlines */ |
287 |
+ |
sl0 = getascan(sb, iy); |
288 |
+ |
#ifdef DEBUG |
289 |
+ |
if (sl0 == NULL) |
290 |
+ |
error(INTERNAL, "cannot backspace in ascanval"); |
291 |
+ |
#endif |
292 |
+ |
sl1 = getascan(sb, iy+1); |
293 |
+ |
/* 2D linear interpolation */ |
294 |
+ |
copycolor(col, sl0[ix]); |
295 |
+ |
scalecolor(col, 1.-dx); |
296 |
+ |
copycolor(c1, sl0[ix+1]); |
297 |
+ |
scalecolor(c1, dx); |
298 |
+ |
addcolor(col, c1); |
299 |
+ |
copycolor(c1y, sl1[ix]); |
300 |
+ |
scalecolor(c1y, 1.-dx); |
301 |
+ |
copycolor(c1, sl1[ix+1]); |
302 |
+ |
scalecolor(c1, dx); |
303 |
+ |
addcolor(c1y, c1); |
304 |
+ |
scalecolor(col, 1.-dy); |
305 |
+ |
scalecolor(c1y, dy); |
306 |
+ |
addcolor(col, c1y); |
307 |
+ |
for (ix = 0; ix < 3; ix++) /* make sure no negative */ |
308 |
+ |
if (colval(col,ix) < 0.) |
309 |
+ |
colval(col,ix) = 0.; |
310 |
+ |
} |
311 |
+ |
|
312 |
+ |
|
313 |
+ |
SCANBAR * |
314 |
+ |
sballoc(se, ns, sl) /* allocate scanbar */ |
315 |
+ |
int se; /* sampling rate exponent */ |
316 |
+ |
int ns; /* number of scanlines */ |
317 |
+ |
int sl; /* original scanline length */ |
318 |
+ |
{ |
319 |
+ |
SCANBAR *sbarr; |
320 |
+ |
register SCANBAR *sb; |
321 |
+ |
|
322 |
+ |
sbarr = sb = (SCANBAR *)malloc((se+1)*sizeof(SCANBAR)); |
323 |
+ |
if (sb == NULL) |
324 |
+ |
syserror("malloc"); |
325 |
+ |
do { |
326 |
+ |
sb->sampe = se; |
327 |
+ |
sb->len = sl>>se; |
328 |
+ |
sb->nscans = ns; |
329 |
+ |
sb->sdata = (COLOR *)malloc(sb->len*ns*sizeof(COLOR)); |
330 |
+ |
if (sb->sdata == NULL) |
331 |
+ |
syserror("malloc"); |
332 |
+ |
sb->nread = 0; |
333 |
+ |
ns <<= 1; |
334 |
+ |
sb++; |
335 |
+ |
} while (--se >= 0); |
336 |
+ |
return(sbarr); |
337 |
+ |
} |
338 |
+ |
|
339 |
+ |
|
340 |
+ |
initacuity() /* initialize variable acuity sampling */ |
341 |
+ |
{ |
342 |
+ |
FVECT diffx, diffy, cp; |
343 |
+ |
double omega, maxsr; |
344 |
+ |
register int x, y, i; |
345 |
+ |
|
346 |
+ |
compraydir(); /* compute ray directions */ |
347 |
+ |
|
348 |
+ |
inpacuD = (float *)malloc(fvxr*fvyr*sizeof(float)); |
349 |
+ |
if (inpacuD == NULL) |
350 |
+ |
syserror("malloc"); |
351 |
+ |
maxsr = 1.; /* compute internal sample rates */ |
352 |
+ |
for (y = 1; y < fvyr-1; y++) |
353 |
+ |
for (x = 1; x < fvxr-1; x++) { |
354 |
+ |
for (i = 0; i < 3; i++) { |
355 |
+ |
diffx[i] = 0.5*fvxr/scanlen(&inpres) * |
356 |
+ |
(rdirscan(y)[x+1][i] - |
357 |
+ |
rdirscan(y)[x-1][i]); |
358 |
+ |
diffy[i] = 0.5*fvyr/numscans(&inpres) * |
359 |
+ |
(rdirscan(y+1)[x][i] - |
360 |
+ |
rdirscan(y-1)[x][i]); |
361 |
+ |
} |
362 |
+ |
fcross(cp, diffx, diffy); |
363 |
+ |
omega = 0.5 * sqrt(DOT(cp,cp)); |
364 |
+ |
if (omega <= FTINY*FTINY) |
365 |
+ |
tsampr(x,y) = 1.; |
366 |
+ |
else if ((tsampr(x,y) = PI/180. / sqrt(omega) / |
367 |
+ |
hacuity(plum(fovscan(y)[x]))) > maxsr) |
368 |
+ |
maxsr = tsampr(x,y); |
369 |
+ |
} |
370 |
+ |
/* copy perimeter (easier) */ |
371 |
+ |
for (x = 1; x < fvxr-1; x++) { |
372 |
+ |
tsampr(x,0) = tsampr(x,1); |
373 |
+ |
tsampr(x,fvyr-1) = tsampr(x,fvyr-2); |
374 |
+ |
} |
375 |
+ |
for (y = 0; y < fvyr; y++) { |
376 |
+ |
tsampr(0,y) = tsampr(1,y); |
377 |
+ |
tsampr(fvxr-1,y) = tsampr(fvxr-2,y); |
378 |
+ |
} |
379 |
+ |
/* initialize with next power of two */ |
380 |
+ |
rootbar = sballoc((int)(log(maxsr)/log(2.))+1, 2, scanlen(&inpres)); |
381 |
|
} |