Debayering (bayer 2 rgb) with opengl glshader gst-1.5.1

[Christian Sell]

Hello,
 
I am not sure how the glshader element works, but I do know how that shader
program works, because we are successfully using it. Actually, we are using the
GL variant for client-side debayering (outside of gstreamer, immediately before
the data is displayed) and the CL variant for debayering inside the gstreamer
pipeline with a custom element.
 
There are 2 things I am doubtful with regard to the glshader element:
 
1. the debayering code consists of a vertex and a pixel (aka fragment) shader.
How are these integrated into glshader?
2. the code expects several parameters to be set from the outside, namely
"source" (input buffer), "sourceSize" (an array with values width, height,
1/width, 1/height) and "firstRed" (a 0/1 combination describing the bayer
pattern in use)
 
I dont see how these prerequistes would be met by glshader..
 
regards,
Chris
 

> Hamdi Rakkez <hamdi.rakez.selotec at gmail.com> hat am 19. August 2015 um 12:06
> geschrieben:
> 
>  Hi,
>   
>  I am trying to use shaders to decode bayer images to RGB images.
>   
>  I don't want to use the bayer2rgb element.
>   
>  So, according to this
> http://graphics.cs.williams.edu/papers/BayerJGT09/#shaders it is possible to
> user gl shaders for demosaicing a bayer image.
>   
>  I have used the shader file along with glshader in a pipeline like this :
>   
>    > > ​gst-launch-1.0 -v filesrc location=bayer_file.avi ! avidemux !
>    > > ​glupload ! glshader location=bayerRGB.GLSL ! glimagesink​
> >  >   
>   
>  But, I have a very noisy result, and an image of the result is attached to
> this Email.​
>   
>  Any ideas why such behavior.
>   
>  Thank you
>  _______________________________________________
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>
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