Recompression of Still Images

Book English OPEN
Chan, Syin (1992)
  • Publisher: UKC
  • Subject: QA76

The effects of subjecting a digital image to more than one step of the lossy JPEG baseline data compression are studied. The performance in terms of the signal-to-noise ratio as well as visual artifacts are observed and presented. Two types of visual artifacts have been identified and they are found to correlate closely to the two types of errors introduced when the Discrete Cosine Transform coefficients undergo repeated quantisation as part of the JPEG compression algorithm. A method is proposed to estimate the amount of errors generated in the process, which may be used to determine if any special processing is required to reduce these errors. Several methods to overcome the more severe artifacts in the images are investigated and the experimental results are presented.
  • References (11)
    11 references, page 1 of 2

    [1] JPEG Committee Draft, "Digital Compression and Coding of Continuous-tone Still Images; Part 1 : Requirements and Guidelines," Reference no. ISO/IEC JTC 1 /SC 2, March 1991.

    [2] Hudson, G.P., et al, "The International Standardisation of a Still Picture Compression Technique," Globecom '88 - Florida, Vol. II, pp. 1016-1021.

    [3] Wallace, G., et al, "Subjective Testing Results for Still Picture Compression Algorithms for International Standardization," Globecom '88 - Florida, Vol. II, pp. 1022-1027.

    [4] Leger, A., et al, "Still Picture Compression Algorithms Evaluated for International Standardisation," Globecom '88 - Florida, Vol. II, pp. 1028-1032.

    [5] Wallace, G., "The JPEG Still Picture Compression Standard," CACM, Vol. 34, No. 4, pp. 31-44, April 1991.

    [6] Hung, A., "Image Compression: The Emerging Standard for Color Images," Computing Futures, 1989.

    [7] Clarke, R.J., Transform Coding of Images, Academic Press, London, 1985, ch. 3.

    [8] Jayant, N.S. and Noll, P., Digital Coding of Waveform: Principles and Applications to Speech and Video, Prentice Hall, New Jersey, 1984, ch. 10.

    [9] Huffman, D.A., "A Method for the Construction of Minimum Redundancy Codes," Proceedings of the IRE, Vol. 40, pp. 1098-1101, Sep. 1952.

    [10] Jayant, N.S. and Noll, P., Digital Coding of Waveform: Principles and Applications to Speech and Video, Prentice Hall, New Jersey, 1984, ch. 6.

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