A combined-transform coding (CTC) scheme for image data compression

The authors propose a combined-transform-coding (CTC) scheme to reduce the blocking effect due to division of subblocks and to achieve better subjective performance. The proposed CTC scheme is described, and its information-theoretic properties are investigated. A comparison between the CTC scheme a...

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Bibliographic Details
Published in:IEEE transactions on consumer electronics 1991-02, Vol.37 (1), p.45-50
Main Authors: Zhang, Y.-Q., Pickholtz, R.L., Loew, M.H.
Format: Article
Language:English
Subjects:
Application software
Applied sciences
Bit rate
Data compression
Discrete cosine transforms
Exact sciences and technology
Image coding
Image processing
Information, signal and communications theory
Noise reduction
Quantization
Redundancy
Signal processing
Signal to noise ratio
Telecommunications and information theory
Transform coding
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Summary:The authors propose a combined-transform-coding (CTC) scheme to reduce the blocking effect due to division of subblocks and to achieve better subjective performance. The proposed CTC scheme is described, and its information-theoretic properties are investigated. A comparison between the CTC scheme and conventional discrete cosine transform (DCT) and discrete Walsh-Hadamard transform (DWHT) schemes was made to demonstrate the performance improvement of the proposed scheme. The advantages of the CTC scheme also include (1) no ringing effect due to the absence of error propagation across block boundaries, (2) no additional computation, and (3) the ability to hold distortion below a certain threshold. In addition, it was found that the idea of combined coding can also be used in noiseless coding.< >
ISSN:0098-3063
1558-4127
DOI:10.1109/30.73639