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 veiling glare and loss of acuity. |
6 |
|
*/ |
11 |
|
|
12 |
|
#define VADAPT 0.08 /* fraction of adaptation from veil */ |
13 |
|
|
14 |
< |
extern COLOR *fovimg; /* foveal (1 degree) averaged image */ |
18 |
< |
extern short fvxr, fvyr; /* foveal image resolution */ |
14 |
> |
static COLOR *veilimg = NULL; /* veiling image */ |
15 |
|
|
20 |
– |
#define fovscan(y) (fovimg+(y)*fvxr) |
21 |
– |
|
22 |
– |
static COLOR *veilimg; /* veiling image */ |
23 |
– |
|
16 |
|
#define veilscan(y) (veilimg+(y)*fvxr) |
17 |
|
|
18 |
|
static float (*raydir)[3] = NULL; /* ray direction for each pixel */ |
33 |
|
syserror("malloc"); |
34 |
|
|
35 |
|
for (y = 0; y < fvyr; y++) { |
36 |
< |
switch (inpres.or) { |
36 |
> |
switch (inpres.rt) { |
37 |
|
case YMAJOR: case YMAJOR|XDECR: |
38 |
|
v = (y+.5)/fvyr; break; |
39 |
|
case YMAJOR|YDECR: case YMAJOR|YDECR|XDECR: |
44 |
|
h = 1. - (y+.5)/fvyr; break; |
45 |
|
} |
46 |
|
for (x = 0; x < fvxr; x++) { |
47 |
< |
switch (inpres.or) { |
47 |
> |
switch (inpres.rt) { |
48 |
|
case YMAJOR: case YMAJOR|YDECR: |
49 |
|
h = (x+.5)/fvxr; break; |
50 |
|
case YMAJOR|XDECR: case YMAJOR|XDECR|YDECR: |
75 |
|
COLOR ctmp, vsum; |
76 |
|
int px, py; |
77 |
|
register int x, y; |
78 |
+ |
|
79 |
+ |
if (veilimg != NULL) /* already done? */ |
80 |
+ |
return; |
81 |
|
/* compute ray directions */ |
82 |
|
compraydir(); |
83 |
|
/* compute veil image */ |
95 |
|
rdirscan(y)[x]); |
96 |
|
if (t2 <= FTINY) continue; |
97 |
|
/* use approximation instead |
98 |
< |
t2 = acos(t2); |
99 |
< |
t2 = 1./(t2*t2); |
98 |
> |
t3 = acos(t2); |
99 |
> |
t2 = t2/(t3*t3); |
100 |
|
*/ |
101 |
< |
t2 = .5 / (1. - t2); |
101 |
> |
t2 *= .5 / (1. - t2); |
102 |
|
copycolor(ctmp, fovscan(y)[x]); |
103 |
|
scalecolor(ctmp, t2); |
104 |
|
addcolor(vsum, ctmp); |
105 |
|
t2sum += t2; |
106 |
|
} |
107 |
|
/* VADAPT of original is subtracted in addveil() */ |
108 |
< |
scalecolor(vsum, VADAPT/t2sum); |
108 |
> |
if (t2sum > FTINY) |
109 |
> |
scalecolor(vsum, VADAPT/t2sum); |
110 |
|
copycolor(veilscan(py)[px], vsum); |
111 |
|
} |
112 |
+ |
/* modify FOV sample image */ |
113 |
+ |
for (y = 0; y < fvyr; y++) |
114 |
+ |
for (x = 0; x < fvxr; x++) { |
115 |
+ |
scalecolor(fovscan(y)[x], 1.-VADAPT); |
116 |
+ |
addcolor(fovscan(y)[x], veilscan(y)[x]); |
117 |
+ |
} |
118 |
+ |
comphist(); /* recompute histogram */ |
119 |
|
} |
120 |
|
|
121 |
|
|
122 |
+ |
#if ADJ_VEIL |
123 |
+ |
/* |
124 |
+ |
* The following veil adjustment was added to compensate for |
125 |
+ |
* the fact that contrast reduction gets confused with veil |
126 |
+ |
* in the human visual system. Therefore, we reduce the |
127 |
+ |
* veil in portions of the image where our mapping has |
128 |
+ |
* already reduced contrast below the target value. |
129 |
+ |
* This gets called after the intial veil has been computed |
130 |
+ |
* and added to the foveal image, and the mapping has been |
131 |
+ |
* determined. |
132 |
+ |
*/ |
133 |
+ |
adjveil() /* adjust veil image */ |
134 |
+ |
{ |
135 |
+ |
float *crfptr = crfimg; |
136 |
+ |
COLOR *fovptr = fovimg; |
137 |
+ |
COLOR *veilptr = veilimg; |
138 |
+ |
double s2nits = 1./inpexp; |
139 |
+ |
double vl, vl2, fovl, vlsum; |
140 |
+ |
double deltavc[3]; |
141 |
+ |
int i, j; |
142 |
+ |
|
143 |
+ |
if (lumf == rgblum) |
144 |
+ |
s2nits *= WHTEFFICACY; |
145 |
+ |
|
146 |
+ |
for (i = fvxr*fvyr; i--; crfptr++, fovptr++, veilptr++) { |
147 |
+ |
if (crfptr[0] >= 0.95) |
148 |
+ |
continue; |
149 |
+ |
vl = plum(veilptr[0]); |
150 |
+ |
fovl = (plum(fovptr[0]) - vl) * (1./(1.-VADAPT)); |
151 |
+ |
if (vl <= 0.05*fovl) |
152 |
+ |
continue; |
153 |
+ |
vlsum = vl; |
154 |
+ |
for (j = 2; j < 11; j++) { |
155 |
+ |
vlsum += crfptr[0]*vl - (1.0 - crfptr[0])*fovl; |
156 |
+ |
vl2 = vlsum / (double)j; |
157 |
+ |
if (vl2 < 0.0) |
158 |
+ |
vl2 = 0.0; |
159 |
+ |
crfptr[0] = crfactor(fovl + vl2); |
160 |
+ |
} |
161 |
+ |
/* desaturation code causes color fringes at this level */ |
162 |
+ |
for (j = 3; j--; ) { |
163 |
+ |
double vc = colval(veilptr[0],j); |
164 |
+ |
double fovc = (colval(fovptr[0],j) - vc) * |
165 |
+ |
(1./(1.-VADAPT)); |
166 |
+ |
deltavc[j] = (1.-crfptr[0])*(fovl/s2nits - fovc); |
167 |
+ |
if (vc + deltavc[j] < 0.0) |
168 |
+ |
break; |
169 |
+ |
} |
170 |
+ |
if (j < 0) |
171 |
+ |
addcolor(veilptr[0], deltavc); |
172 |
+ |
else |
173 |
+ |
scalecolor(veilptr[0], vl2/vl); |
174 |
+ |
} |
175 |
+ |
smoothveil(); /* smooth our result */ |
176 |
+ |
} |
177 |
+ |
|
178 |
+ |
|
179 |
+ |
smoothveil() /* smooth veil image */ |
180 |
+ |
{ |
181 |
+ |
COLOR *nveilimg; |
182 |
+ |
COLOR *ovptr, *nvptr; |
183 |
+ |
int x, y, i; |
184 |
+ |
|
185 |
+ |
nveilimg = (COLOR *)malloc(fvxr*fvyr*sizeof(COLOR)); |
186 |
+ |
if (nveilimg == NULL) |
187 |
+ |
return; |
188 |
+ |
for (y = 1; y < fvyr-1; y++) { |
189 |
+ |
ovptr = veilimg + y*fvxr + 1; |
190 |
+ |
nvptr = nveilimg + y*fvxr + 1; |
191 |
+ |
for (x = 1; x < fvxr-1; x++, ovptr++, nvptr++) |
192 |
+ |
for (i = 3; i--; ) |
193 |
+ |
nvptr[0][i] = 0.5 * ovptr[0][i] |
194 |
+ |
+ (1./12.) * |
195 |
+ |
(ovptr[-1][i] + ovptr[-fvxr][i] + |
196 |
+ |
ovptr[1][i] + ovptr[fvxr][i]) |
197 |
+ |
+ (1./24.) * |
198 |
+ |
(ovptr[-fvxr-1][i] + ovptr[-fvxr+1][i] + |
199 |
+ |
ovptr[fvxr-1][i] + ovptr[fvxr+1][i]); |
200 |
+ |
} |
201 |
+ |
ovptr = veilimg + 1; |
202 |
+ |
nvptr = nveilimg + 1; |
203 |
+ |
for (x = 1; x < fvxr-1; x++, ovptr++, nvptr++) |
204 |
+ |
for (i = 3; i--; ) |
205 |
+ |
nvptr[0][i] = 0.5 * ovptr[0][i] |
206 |
+ |
+ (1./9.) * |
207 |
+ |
(ovptr[-1][i] + ovptr[1][i] + ovptr[fvxr][i]) |
208 |
+ |
+ (1./12.) * |
209 |
+ |
(ovptr[fvxr-1][i] + ovptr[fvxr+1][i]); |
210 |
+ |
ovptr = veilimg + (fvyr-1)*fvxr + 1; |
211 |
+ |
nvptr = nveilimg + (fvyr-1)*fvxr + 1; |
212 |
+ |
for (x = 1; x < fvxr-1; x++, ovptr++, nvptr++) |
213 |
+ |
for (i = 3; i--; ) |
214 |
+ |
nvptr[0][i] = 0.5 * ovptr[0][i] |
215 |
+ |
+ (1./9.) * |
216 |
+ |
(ovptr[-1][i] + ovptr[1][i] + ovptr[-fvxr][i]) |
217 |
+ |
+ (1./12.) * |
218 |
+ |
(ovptr[-fvxr-1][i] + ovptr[-fvxr+1][i]); |
219 |
+ |
ovptr = veilimg + fvxr; |
220 |
+ |
nvptr = nveilimg + fvxr; |
221 |
+ |
for (y = 1; y < fvyr-1; y++, ovptr += fvxr, nvptr += fvxr) |
222 |
+ |
for (i = 3; i--; ) |
223 |
+ |
nvptr[0][i] = 0.5 * ovptr[0][i] |
224 |
+ |
+ (1./9.) * |
225 |
+ |
(ovptr[-fvxr][i] + ovptr[1][i] + ovptr[fvxr][i]) |
226 |
+ |
+ (1./12.) * |
227 |
+ |
(ovptr[-fvxr+1][i] + ovptr[fvxr+1][i]); |
228 |
+ |
ovptr = veilimg + fvxr - 1; |
229 |
+ |
nvptr = nveilimg + fvxr - 1; |
230 |
+ |
for (y = 1; y < fvyr-1; y++, ovptr += fvxr, nvptr += fvxr) |
231 |
+ |
for (i = 3; i--; ) |
232 |
+ |
nvptr[0][i] = 0.5 * ovptr[0][i] |
233 |
+ |
+ (1./9.) * |
234 |
+ |
(ovptr[-fvxr][i] + ovptr[-1][i] + ovptr[fvxr][i]) |
235 |
+ |
+ (1./12.) * |
236 |
+ |
(ovptr[-fvxr-1][i] + ovptr[fvxr-1][i]); |
237 |
+ |
for (i = 3; i--; ) { |
238 |
+ |
nveilimg[0][i] = veilimg[0][i]; |
239 |
+ |
nveilimg[fvxr-1][i] = veilimg[fvxr-1][i]; |
240 |
+ |
nveilimg[(fvyr-1)*fvxr][i] = veilimg[(fvyr-1)*fvxr][i]; |
241 |
+ |
nveilimg[fvyr*fvxr-1][i] = veilimg[fvyr*fvxr-1][i]; |
242 |
+ |
} |
243 |
+ |
free((void *)veilimg); |
244 |
+ |
veilimg = nveilimg; |
245 |
+ |
} |
246 |
+ |
#endif |
247 |
+ |
|
248 |
|
addveil(sl, y) /* add veil to scanline */ |
249 |
|
COLOR *sl; |
250 |
|
int y; |
295 |
|
double |
296 |
|
hacuity(La) /* return visual acuity in cycles/degree */ |
297 |
|
double La; |
298 |
< |
{ /* data due to S. Shaler (we should fit it!) */ |
299 |
< |
#define NPOINTS 20 |
300 |
< |
static float l10lum[NPOINTS] = { |
172 |
< |
-3.10503,-2.66403,-2.37703,-2.09303,-1.64403,-1.35803, |
173 |
< |
-1.07403,-0.67203,-0.38503,-0.10103,0.29397,0.58097,0.86497, |
174 |
< |
1.25697,1.54397,1.82797,2.27597,2.56297,2.84697,3.24897 |
175 |
< |
}; |
176 |
< |
static float resfreq[NPOINTS] = { |
177 |
< |
2.09,3.28,3.79,4.39,6.11,8.83,10.94,18.66,23.88,31.05,37.42, |
178 |
< |
37.68,41.60,43.16,45.30,47.00,48.43,48.32,51.06,51.09 |
179 |
< |
}; |
180 |
< |
double l10La; |
181 |
< |
register int i; |
182 |
< |
/* check limits */ |
183 |
< |
if (La <= 7.85e-4) |
184 |
< |
return(resfreq[0]); |
185 |
< |
if (La >= 1.78e3) |
186 |
< |
return(resfreq[NPOINTS-1]); |
187 |
< |
/* interpolate data */ |
188 |
< |
l10La = log10(La); |
189 |
< |
for (i = 0; i < NPOINTS-2 && l10lum[i+1] <= l10La; i++) |
190 |
< |
; |
191 |
< |
return( ( (l10lum[i+1] - l10La)*resfreq[i] + |
192 |
< |
(l10La - l10lum[i])*resfreq[i+1] ) / |
193 |
< |
(l10lum[i+1] - l10lum[i]) ); |
194 |
< |
#undef NPOINTS |
298 |
> |
{ |
299 |
> |
/* functional fit */ |
300 |
> |
return(17.25*atan(1.4*log10(La) + 0.35) + 25.72); |
301 |
|
} |
302 |
|
|
303 |
|
|
409 |
|
/* get scanlines */ |
410 |
|
sl0 = getascan(sb, iy); |
411 |
|
#ifdef DEBUG |
412 |
< |
if (sl0 == NULL) { |
413 |
< |
fprintf(stderr, "%s: internal - cannot backspace in ascanval\n", |
308 |
< |
progname); |
309 |
< |
abort(); |
310 |
< |
} |
412 |
> |
if (sl0 == NULL) |
413 |
> |
error(INTERNAL, "cannot backspace in ascanval"); |
414 |
|
#endif |
415 |
|
sl1 = getascan(sb, iy+1); |
416 |
|
/* 2D linear interpolation */ |
446 |
|
if (sb == NULL) |
447 |
|
syserror("malloc"); |
448 |
|
do { |
346 |
– |
sb->sampe = se; |
449 |
|
sb->len = sl>>se; |
450 |
+ |
if (sb->len <= 0) |
451 |
+ |
continue; |
452 |
+ |
sb->sampe = se; |
453 |
|
sb->nscans = ns; |
454 |
|
sb->sdata = (COLOR *)malloc(sb->len*ns*sizeof(COLOR)); |
455 |
|
if (sb->sdata == NULL) |