Hi, I got an Olympus E-510 and currently developing rendering using raw Bayer data.
Thanks to Dave C's "DCRAW", I'am able to hack on it and get the raw bayer data out.
I've observed channel unbalance between Gr and Gb channel. On my camera, it has about 2% difference in gain, i.e., Applying gain equalization with Gr / 1.02 = Gb * 1.02, in order to get smooth gray field without horizontal grid lines.
On other people's camera (ORF raw data from web sites), it requires different channel gain offsets.
I believe the CMOS sensor is from Panasonic.
I have the following questions:
Does Gr and R share the same analog channel? Anyone has the sensor spec?
Does the maker note contains the channel gain offset calibration data? If so, how to decode it?
By the way, on E-400 (Kodak CCD sensor) does not exhibit such gain offset problem.
Thu, 05 Mar 2009 00:15:42 +0000
Gr and Gb often differ, and not with a fixed percentage.
Gr usually goes up in reds, and down in blues.
For good compensation you will need to map R, G, B values to a Gr correction.
Some cameras compensate for this internally.
Set BayerGreenSplit to >0 to tell the debayer code that there is a split.
Tue, 27 Apr 2010 18:15:49 +0000
Did your message disappear? Read the Forums FAQ.
Spam Control | * indicates required field
TrackBack only accepted from WebSite-X Suite web sites. Do not submit TrackBacks from other sites.
No TrackBacks yet. TrackBack can be used to link this thread to your weblog, or link your weblog to this thread. In addition, TrackBack can be used as a form of remote commenting. Rather than posting the comment directly on this thread, you can posts it on your own weblog. Then have your weblog sends a TrackBack ping to the TrackBack URL, so that your post would show up here.
Messages, files, and images copyright by respective owners.