liz/rawTherapee
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Bugfix for autoexposure on blackframes.

Browse Source
This commit is contained in:
Emil Martinec
2012-05-05 22:03:25 -05:00
parent fd5d2d03c2
commit 686188d6bb
1 changed files with 30 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
rtengine/improcfun.cc
View File

@@ -673,11 +673,20 @@ fclose(f);*/
ave /= (sum);
//find median of luminance
int median=0, count=0;
int median=0, count=histogram[0];
while (count<sum/2) {
median++;
count += histogram[median];
}
if (median==0) {//probably the image is a blackframe
expcomp=0;
black=0;
bright=0;
contr=0;
hlcompr=0;
hlcomprthresh=0;
return;
}
// compute std dev on the high and low side of median
// and octiles of histogram
@@ -702,6 +711,15 @@ fclose(f);*/
}
}
if (losum==0 || hisum==0) {//probably the image is a blackframe
expcomp=0;
black=0;
bright=0;
contr=0;
hlcompr=0;
hlcomprthresh=0;
return;
}
lodev = (lodev/(log(2)*losum));
hidev = (hidev/(log(2)*hisum));
if (octile[7]>log(imax+1)/log2(2)) {
@@ -713,6 +731,16 @@ fclose(f);*/
ospread += (octile[i+1]-octile[i])/max(0.5f,(i>2 ? (octile[i+1]-octile[3]) : (octile[3]-octile[i])));
}
ospread /= 5;
if (ospread<=0) {//probably the image is a blackframe
expcomp=0;
black=0;
bright=0;
contr=0;
hlcompr=0;
hlcomprthresh=0;
return;
}
// compute clipping points based on the original histograms (linear, without exp comp.)
int clipped = 0;
@@ -747,7 +775,7 @@ fclose(f);*/
shc <<= histcompr;
//prevent division by 0
if (ave==0) ave=1;
if (ave<1) return;
if (lodev==0) lodev=1;
//compute exposure compensation as geometric mean of the amount that