A Comparison Of The Visual Effects Of Two Transform Domain Encoding Approaches

J. D. Olsen; C. M. Heard

doi:10.1117/12.955707

8 December 1977 A Comparison Of The Visual Effects Of Two Transform Domain Encoding Approaches

J. D. Olsen, C. M. Heard

Proceedings Volume 0119, Applications of Digital Image Processing; (1977) https://doi.org/10.1117/12.955707
Event: 21st Annual Technical Symposium, 1977, San Diego, United States

Abstract

Rate-distortion theory using the mean squared error criterion is often used to design digital image coding rules. The resulting distortion is, in theory, statistically equivalent to omitting components of the image from transmission. We compare a rate-distortion simulation using the discrete cosine transform to a method which is statistically equivalent to adding uncorrelated random noise to the image. This latter method is based on a PN (pseudo-noise) transform, which is generated from a Hadamard matrix whose core consists of the cyclic shifts of a binary maximum length linear shift register sequence. Visual comparisons of the two approaches are made at the same mean squared error. In all cases, the images encoded using the PN transform method showed superior definition of detail and less geometrical distortion at transform block boundaries than the images encoded using the discrete cosine method. The results of this experiment suggest that image appearance may be improved by designing transform coefficient quantization rules to approximate the effects of additive noise rather than to omit low energy image components, as dictated by conventional rate-distortion theory.

Citation Download Citation

J. D. Olsen and C. M. Heard "A Comparison Of The Visual Effects Of Two Transform Domain Encoding Approaches", Proc. SPIE 0119, Applications of Digital Image Processing, (8 December 1977); https://doi.org/10.1117/12.955707

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