[Radiance-general] Fwd: errors from hdrgen

[Axel Jacobs]

Martin,

>Ah yes, I had been meaning to try the camera calibration technique but I 
>hadn't come around to it. It turns out to be very useful. But I still have 
>some issues. I took in all 13 pictures of an indoor scene looking out the 
>window for the calibration. I then had to remove the darkest and the lightest 
>of them to get a hdr image. That leaves about 8 images and I get a hdr image 
>but there are errors in the conversion process.
>  
>
I hdr'ed all ouf the 13 images in one go, and apart for some 'poor 
convergence' (orders 1, 3, 4 and 5) warnings, it worked fine. There is 
no apparent distortion.

>The resulting hdr does not look very good, first of all the alignment 
>algorithm always distorts it like crazy. The images were taken with a tripod 
>so they should be reasonably well aligned but the algorithm moves them all 
>over the place. So I disable that. I tried setting -g to kill the ghosts but 
>that totally messed up the color balance of the image.
>  
>
As you say, the indoor scene is a bit greenish, but outdoors is fine. 
There seems to be a lot of brown in the room (table, wall panelling). I 
don't know if this could cause the prob.

Axel

PS: I don't know if Greg has recently updated hdrgen. My copy is >6 
months old (LINUX).

PPS: With the two darkest and the two brightest images excluded, there 
is a poor convergence for orders 1 and 5 fit, but still no distortions.