Interpolation of rgb components in bayer cfa images
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Interpolation of RGB components in Bayer CFA images. CEG4311 Eric Dubois. Demosaicking of Bayer-sampled color images.

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Demosaicking of bayer sampled color images l.jpg
Demosaicking of Bayer-sampled color images

  • Problem: Most digital color cameras, capture only one color component at each spatial location. The remaining components must be reconstructed by interpolation from the captured samples. Objective: Develop algorithms to interpolate each color plane (called demosaicking) with best quality reconstruction, and with minimal computational complexity.



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original


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red original


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green original


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blue original



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red subsampled


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green subsampled


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blue subsampled


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Bayer CFA image


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Color plane interpolation

Green channel: bilinear interpolation

GA

GL

GR

GI

GB


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Color plane interpolation

Red channel: bilinear interpolation

RNE

RNW

RC

RSE

RS

RSW


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red interpolated


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green interpolated


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blue interpolated


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Interpolated color image


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original


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Can we do better?

  • Color planes have severe aliasing. Better interpolation of the individual planes has little effect.


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red interpolated

with bilinear interpolator


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red interpolated

with bicubic interpolator


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Can we do better?

  • Color planes have severe aliasing. Better interpolation of the individual planes has little effect.

  • We could optically prefilter the image (blur it) so that aliasing is less severe.


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red interpolated

with bilinear interpolator


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prefiltered red interpolated

with bilinear interpolator


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Interpolated color image


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Prefiltered Interpolated color image


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original


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Interpolated color image with new frequency domain method


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