Problems with 600D

Started by Luiz Roberto dos Santos, December 04, 2013, 09:02:00 PM

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Luiz Roberto dos Santos

Hi!
I've been reporting some errors that has occurred to me when I record in raw_rec.
[I'm using the most updated version of NB, with a SD Sandisk 95MB/s]

- Some points, usually magenta or cyan, are invading the raw material (not crop factor, full mode). I'm recording in 1152x460 at 23,976fps and doing the conversion with BATchelor3 (to Cineform with Adobe DNG Converter).
The .RAW File can be downloaded here: http://goo.gl/GXGBCu

Image reference:




- Another error that has occurred with some vertical lines are rec. to 3x crop mode. Not dual_iso using, only recording with the raw_rec module. Would be the algorithm of Adobe flawed, or Cineform encoder? Or, maybe, hardware error?

Downloading .RAW can be done here: http://goo.gl/sjiI6x


Image Reference (stretch to 2x with Spline64):




Image reference sharpen:







Greetings.

1%

Dead pixels on the top one... vertical banding on the bottom. I think a universal method has to be developed since 7D is plagued by those at ISO 3200 and maybe lower.. your camera is ok this is in all raw because the defect correction is not applied until at least YUV

Luiz Roberto dos Santos

Any idea how to solve this problem? Interpolation algorithms, perhaps?
I mean, if it were possible to apply an algorithm that detects where all dead pixel (believe it can be calculated by multiple frames, since the object is static in all frames). These algorithms are in various denoiser's, for example, for the detection of chroma noise. After locating, applying an algorithm that tries to interpolate only one affected area...
Maybe the vertical banding can be solved similarly, no?
I do not understand the physical functionality of the camera, I have no idea what happens in the vertical banding, you can try to explain? It comes from the line skipping that is given to resize the video full resolution for that specified in raw_rec module?
[sorry for my bad english]

maxotics

Yes, I believe you can find and interpolate around those pixels.  Similar efforts have worked for me with FocusPixelFixer, however, that particular problem is not worth the effort, which isn't insignificant, even though it sounds easy in theory.  Anyway, the de-bayering algo you use can have a strong effect on showing, or not showing, those isolated pixels.  Alex has already implemented smoothing algos into raw2dng.

Anyway, you could fork https://bitbucket.org/maxotics/focuspixelfixer this and get on the fast track to finding and interpolating around those pixels.

a1ex

Quote from: 1% on December 04, 2013, 10:17:48 PM
Dead pixels on the top one... vertical banding on the bottom. I think a universal method has to be developed since 7D is plagued by those at ISO 3200 and maybe lower..

Can you collect a few DNG pictures that show this kind of banding and upload them somewhere? Silent pics are even better, because they contain the optical black data, but raw video doesn't.

1%

Yep... maybe it would be good to make a dead pixel + banding thread. I think I already put up some 6D before, they move when the sensor heats up... need to do the 7D banding, its pretty serious in the shadows. 600D I think is the least affected ironically.

Luiz Roberto dos Santos

Quote from: maxotics on December 04, 2013, 11:04:37 PM
Yes, I believe you can find and interpolate around those pixels.  Similar efforts have worked for me with FocusPixelFixer, however, that particular problem is not worth the effort, which isn't insignificant, even though it sounds easy in theory.  Anyway, the de-bayering algo you use can have a strong effect on showing, or not showing, those isolated pixels.  Alex has already implemented smoothing algos into raw2dng.

Anyway, you could fork https://bitbucket.org/maxotics/focuspixelfixer this and get on the fast track to finding and interpolating around those pixels.


I try it, but the cmd crash and generate the dual identical archive... do you know how I can fix it?



Quote from: a1ex on December 05, 2013, 03:28:44 AM
Can you collect a few DNG pictures that show this kind of banding and upload them somewhere? Silent pics are even better, because they contain the optical black data, but raw video doesn't.


I put some files here A1ex: https://app.box.com/s/hu3wyyzzv5k0catyxy55

But, the pink/cyan dots don't appear on silent pics, just the 'vertical banding (on deep shadows).