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Efficient block-based coding of noisy images by combining pre-filtering and DCT

Efficient block-based coding of noisy images by combining pre-filtering and DCT

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An efficient block-based coding scheme for noisy images is proposed. Unlike a conventional encoder where pre-filtering, discrete cosine transforms (DCT), quantisation, and variable length coding (VLC) are cascaded, the proposed image coder has only a modified DCT and a VLC, and performs pre-filtering and quantisation simultaneously in the modified DCT operation.

References

    1. 1)
      • A.K. Jain . (1989) Fundamentals of digital image processing.
    2. 2)
      • E. Feig , S. Winograd . Fast algorithms for the discrete cosine transform. IEEE Trans. Signal Process. , 9 , 2174 - 2193
    3. 3)
      • W.K. Pratt . Generalized Wiener filtering computation techniques. IEEE Trans. , 636 - 641
    4. 4)
      • O.K. Al-Shaykh , R.M. Mersereau . Lossy compression of noisy images. IEEE Trans. Image Process. , 12 , 1641 - 1652
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