Ask HN: Anybody interesting in a Sunday afternoon puzzle?

1 point

16 years ago

So I've implemented the retinex algorithm from GIMP in java. (Lots of reasons but mainly flexibility, threading and memory usage).

Here's an example of the current differences:

http://imgur.com/GPsy9.png

GIMP is the top, mine is the bottom. Given that in large part this is a Gaussian filter at first, I've got to assert that mine is probably the correct one. However, the sad part is I am really interesting in implementing this bugged behavior as well.

My implementation is here:

http://github.com/rortian/Retinex/blob/master/src/org/pseudopattern/retinex/ByteImage.java

which corresponds with this gimp file:

http://git.gnome.org/browse/gimp/tree/plug-ins/common/contrast-retinex.c?id=GIMP_2_6_8

I'm about to have to start building gimps that will give me more insight, which I don't honestly want to do. If anybody has any clue how this might be happening I'd love the help. I've got a minimal C background so any comments from someone knowledgeable there would be especially helpful.

1 comment