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Activity function for DCT coded images

Activity function for DCT coded images

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© The Institution of Electrical Engineers
Published

By combining a measure of activity in transform-coded image blocks with frequency sensitivity data, suitable psychovisual coefficient quantisation step sizes can be calculated. A number of possible definitions for an activity function AT are proposed. The most suitable of these is determined by comparing results on a subjective basis.

Inspec keywords: encoding; picture processing; transforms

Other keywords: DCT coded images; discrete cosine transform; quantisation step sizes; frequency sensitivity data; activity function; spatial masking; picture processing; psychovisual coefficient; transform-coded image blocks

Subjects: Integral transforms; Optical information, image and video signal processing; Codes; Pattern recognition; Integral transforms

References

    1. 1)
      • D.J. Sakrison . On the role of the observer and a distortion measure in image transmission. IEEE Trans. , 1251 - 1267
    2. 2)
      • A.N. Netravali , B.G. Haskell . (1988) , Digital pictures: representation and compression.
    3. 3)
      • A.N. Netravali , B. Prasada . Adaptive quantization of picture signals using spatial masking. Proc. IEEE , 536 - 548
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