| 11 |
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#include "pcond.h" |
| 12 |
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| 13 |
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|
| 14 |
< |
#define CVRATIO 0.025 /* fraction of pixels allowed > env. */ |
| 14 |
> |
#define CVRATIO 0.025 /* fraction of samples allowed > env. */ |
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|
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– |
#define BotMesopic 5.62e-3 /* top of scotopic range */ |
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– |
#define TopMesopic 5.62 /* bottom of photopic range */ |
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– |
|
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#define exp10(x) exp(2.302585093*(x)) |
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| 18 |
< |
int modhist[HISTRES]; /* modified histogram */ |
| 18 |
> |
float modhist[HISTRES]; /* modified histogram */ |
| 19 |
> |
double mhistot; /* modified histogram total */ |
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float cumf[HISTRES+1]; /* cumulative distribution function */ |
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mkcumf() /* make cumulative distribution function */ |
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{ |
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register int i; |
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< |
register long sum; |
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> |
register double sum; |
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| 28 |
< |
cumf[0] = 0.; |
| 29 |
< |
sum = modhist[0]; |
| 30 |
< |
for (i = 1; i < HISTRES; i++) { |
| 31 |
< |
cumf[i] = (double)sum/histot; |
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> |
mhistot = 0.; /* compute modified total */ |
| 29 |
> |
for (i = 0; i < HISTRES; i++) |
| 30 |
> |
mhistot += modhist[i]; |
| 31 |
> |
|
| 32 |
> |
sum = 0.; /* compute cumulative function */ |
| 33 |
> |
for (i = 0; i < HISTRES; i++) { |
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> |
cumf[i] = sum/mhistot; |
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sum += modhist[i]; |
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} |
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cumf[HISTRES] = 1.; |
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return(Bldmin); |
| 62 |
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if (b >= bwmax-FTINY) |
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return(Bldmax); |
| 64 |
< |
return(Bldmin + cf(Bl(Lw))*(Bldmax-Bldmin)); |
| 64 |
> |
return(Bldmin + cf(b)*(Bldmax-Bldmin)); |
| 65 |
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} |
| 66 |
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| 67 |
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int |
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mkbrmap() /* make dynamic range map */ |
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{ |
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– |
int hdiffs[HISTRES], above, below; |
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double T, b, s; |
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< |
int maxd, maxi, sd; |
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> |
double ceiling, trimmings; |
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register int i; |
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/* copy initial histogram */ |
| 119 |
< |
for (i = 0; i < HISTRES; i++) |
| 120 |
< |
modhist[i] = bwhist[i]; |
| 121 |
< |
T = histot * (bwmax - bwmin) / HISTRES; |
| 119 |
> |
bcopy((char *)bwhist, (char *)modhist, sizeof(modhist)); |
| 120 |
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s = (bwmax - bwmin)/HISTRES; |
| 121 |
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/* loop until satisfactory */ |
| 122 |
< |
for ( ; ; ) { |
| 123 |
< |
mkcumf(); /* sync brightness mapping */ |
| 124 |
< |
above = below = 0; /* compute visibility overflow */ |
| 122 |
> |
do { |
| 123 |
> |
mkcumf(); /* sync brightness mapping */ |
| 124 |
> |
if (mhistot <= histot*CVRATIO) |
| 125 |
> |
return(-1); /* no compression needed! */ |
| 126 |
> |
T = mhistot * (bwmax - bwmin) / HISTRES; |
| 127 |
> |
trimmings = 0.; /* clip to envelope */ |
| 128 |
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for (i = 0, b = bwmin + .5*s; i < HISTRES; i++, b += s) { |
| 129 |
< |
hdiffs[i] = modhist[i] - (int)(T*clampf(Lb(b)) + .5); |
| 130 |
< |
if (hdiffs[i] > 0) above += hdiffs[i]; |
| 131 |
< |
else below -= hdiffs[i]; |
| 129 |
> |
ceiling = T*clampf(Lb(b)); |
| 130 |
> |
if (modhist[i] > ceiling) { |
| 131 |
> |
trimmings += modhist[i] - ceiling; |
| 132 |
> |
modhist[i] = ceiling; |
| 133 |
> |
} |
| 134 |
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} |
| 135 |
< |
if (above <= histot*CVRATIO) |
| 136 |
< |
break; /* close enough */ |
| 137 |
< |
if (above-below >= 0) |
| 135 |
< |
return(-1); /* Houston, we have a problem.... */ |
| 136 |
< |
/* original looped here as well (BEGIN_L2) */ |
| 137 |
< |
maxd = 0; /* find largest overvis */ |
| 138 |
< |
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); |
| 135 |
> |
} while (trimmings > histot*CVRATIO); |
| 136 |
> |
|
| 137 |
> |
return(0); /* we got it */ |
| 138 |
|
} |
| 139 |
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|
| 140 |
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|
| 190 |
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} |
| 191 |
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|
| 192 |
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|
| 193 |
< |
#ifdef DEBUG |
| 194 |
< |
doplots() /* generate debugging plots */ |
| 193 |
> |
putmapping(fp) /* put out mapping function */ |
| 194 |
> |
FILE *fp; |
| 195 |
|
{ |
| 196 |
< |
double T, b, s; |
| 221 |
< |
FILE *fp; |
| 222 |
< |
char fname[128]; |
| 196 |
> |
double b, s; |
| 197 |
|
register int i; |
| 198 |
+ |
double wlum, sf; |
| 199 |
|
|
| 200 |
< |
T = histot * (bwmax - bwmin) / HISTRES; |
| 200 |
> |
sf = scalef*inpexp; |
| 201 |
> |
if (lumf == cielum) sf *= WHTEFFICACY; |
| 202 |
|
s = (bwmax - bwmin)/HISTRES; |
| 203 |
< |
|
| 204 |
< |
sprintf(fname, "%s_hist.plt", infn); |
| 205 |
< |
if ((fp = fopen(fname, "w")) == NULL) |
| 206 |
< |
syserror(fname); |
| 207 |
< |
fputs("include=curve.plt\n", fp); |
| 208 |
< |
fputs("title=\"Brightness Frequency Distribution\"\n", fp); |
| 209 |
< |
fprintf(fp, "subtitle=%s\n", infn); |
| 234 |
< |
fputs("ymin=0\n", fp); |
| 235 |
< |
fputs("xlabel=\"Perceptual Brightness B(Lw)\"\n", fp); |
| 236 |
< |
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); |
| 203 |
> |
for (i = 0, b = bwmin + .5*s; i < HISTRES; i++, b += s) { |
| 204 |
> |
wlum = Lb(b); |
| 205 |
> |
if (what2do&DO_LINEAR) |
| 206 |
> |
fprintf(fp, "%e %e\n", wlum, sf*wlum); |
| 207 |
> |
else |
| 208 |
> |
fprintf(fp, "%e %e\n", wlum, Lb(BLw(wlum))); |
| 209 |
> |
} |
| 210 |
|
} |
| 250 |
– |
#endif |
