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Interpolation of RGB components in Bayer CFA images

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

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Interpolation of RGB components in Bayer CFA images

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  1. Interpolation of RGB components in Bayer CFA images CEG4311 Eric Dubois

  2. 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.

  3. Construction of color image from color planes +

  4. Lighthouse original

  5. Lighthouse red original

  6. Lighthouse green original

  7. Lighthouse blue original

  8. Formation of Color planes

  9. Lighthouse red subsampled

  10. Lighthouse green subsampled

  11. Lighthouse blue subsampled

  12. Lighthouse Bayer CFA image

  13. Color plane interpolation Green channel: bilinear interpolation GA GL GR GI GB

  14. Color plane interpolation Red channel: bilinear interpolation RNE RNW RC RSE RS RSW

  15. Lighthouse red interpolated

  16. Lighthouse green interpolated

  17. Lighthouse blue interpolated

  18. Lighthouse Interpolated color image

  19. Lighthouse original

  20. Can we do better? • Color planes have severe aliasing. Better interpolation of the individual planes has little effect.

  21. Lighthouse red interpolated with bilinear interpolator

  22. Lighthouse red interpolated with bicubic interpolator

  23. 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.

  24. Lighthouse red interpolated with bilinear interpolator

  25. Lighthouse prefiltered red interpolated with bilinear interpolator

  26. Lighthouse Interpolated color image

  27. Lighthouse Prefiltered Interpolated color image

  28. Lighthouse original

  29. Lighthouse Interpolated color image with new frequency domain method

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