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View Full Version : Debeyering Issue in Registax



flyer
January 25, 2011, 22:52:06
Camera: DFK31AU03.AS

I'm having trouble understanding why this is happening as I have previously had success in Debayering with Registax. As far as I can tell I'm following the exact same procedure.

My recent captures look ok until the final step in Registax and the application of wavelets. When I apply wavelets to the image the Bayer grid pattern comes out very strongly. As a test I captured and stacked the exact same number of frames (1000 frames) from an avi not captured in Y800. Applying the wavelet function here to the exact same degree does not show any grid pattern. (The photos are lousy but that's not the point!)

http://i1084.photobucket.com/albums/j414/PR33/JupitershowingBeyerGrid.jpg

http://i1084.photobucket.com/albums/j414/PR33/Jupiter-nogrid.jpg

Advice greatly appreciated!

tea drinker
February 9, 2011, 18:08:06
Did you make some changes on the exposure and gain settings?
I know on my DBK41 some settings seem more prone to this than others.

What format did you record the second avi in, yuy2 or?

flyer
February 10, 2011, 01:04:19
Did you make some changes on the exposure and gain settings?
I know on my DBK41 some settings seem more prone to this than others.

What format did you record the second avi in, yuy2 or?


Possibly there were settings in gain/exposure that were different, but not for the test. The settings were identical. The non-Y800 capture was in BY8 to RGB24.

Thanks for your reply!!

tea drinker
February 10, 2011, 13:16:34
try downloading the vlc media player, it's a sort of all purpose player.
Open the avi and look closely at both video's and see if the artifacts exist in one and not the other.
A lot of my avi's will show this pixelation in contrasty areas when you zoom in. (and some very little - these can accept more wavelet processing)
Under Video tab, turn off scale. Then set Zoom to 2:1, you will see the degradation.
Obviously registax is processing this, but a particular combination of settings (exposure/gain/Gamma) seems to worsen it.
I am unsure how Gamma works but Gain is amplifying signal, so prone to noise?
Exposure gets you more or less photons.
The brightness slider has very little visible effect.
Always keep a settings file with each imaging run to see if you can avoid the problem a much as possible. Vlc player can of course be used in the field...

I wonder if Stefan has any thoughts on the "pixelation" around contrasty areas?

Stefan Geissler
February 10, 2011, 16:09:25
I wonder if Stefan has any thoughts on the "pixelation" around contrasty areas?
Edit/Delete Message
I must admit, I am kind of speechless. I would like Flyer to try the latest driver 1.3.8.542. There is a little change on the DeBayerTransformfilter. (http://www.theimagingsource.com/downloads/icwdmuvccamtis.en_US.zip)

flyer
February 13, 2011, 07:12:25
I must admit, I am kind of speechless. I would like Flyer to try the latest driver 1.3.8.542. There is a little change on the DeBayerTransformfilter. (http://www.theimagingsource.com/downloads/icwdmuvccamtis.en_US.zip)


Hi Stefan,

I will certainly try this as soon as I get my camera back from Taiwan. Not sure when this will be but I hope soon.

In the meantime I have discovered - with much help - a way to Debayer Y800 using AviSynth. At least it was a discovery to me. I think some of us may find this quite useful to not have to rely on Registax (or Ninox). I guess it remains to be seen just how well the Debayering is done by AviSynth. Stefan, do you have any input on this?