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In-loop selective processing for contour artefact reduction in video coding

In-loop selective processing for contour artefact reduction in video coding

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Proposed is an in-loop decontouring algorithm that utilises block-based processing for video coding. In order to avoid uniform filtering that brings about unnecessary processing, candidate blocks that may contain noticeable false contours using different kinds of features in a block are sequentially refined. Then, pseudorandom noise masking is applied to them to reduce contour artefacts. It is demonstrated that visual quality could be efficiently improved with a negligible rate-distortion (RD) loss.

References

    1. 1)
      • ITU-T Recommendation P.910, ‘Subjective video quality assessment methods for multimedia applications’, September 1999.
    2. 2)
      • Bjontegaard, G.: `Calculation of average PSNR differences between RD-curves', VCEG-M33, April 2001, Austin, TX, USA.
    3. 3)
      • Boyce, J.M., Tourapis, A.M.: `Comfort noise for compressed video', ICCE, January 2005, p. 323–324.
    4. 4)
      • S. Bhagavathy . Multi-scale probabilistic dithering for suppressing contour artefacts in digital images. IEEE Trans. Image Processing
    5. 5)
      • A.N. Nettravali , B.G. Haskell . (1998) Digital pictures: representation and compression.
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