Adaptive Block Cosine Transform Coding Using A New Quantization Algorithm

Hisashi Yonekawa; Yoshiyuki Ishimitsu; Junichirou Akune; Hiroshi Takeuchi

doi:10.1117/12.953363

25 May 1989 Adaptive Block Cosine Transform Coding Using A New Quantization Algorithm

Hisashi Yonekawa, Yoshiyuki Ishimitsu, Junichirou Akune, Hiroshi Takeuchi

Proceedings Volume 1093, Medical Imaging III: PACS System Design and Evaluation; (1989) https://doi.org/10.1117/12.953363
Event: Medical Imaging III, 1989, Newport Beach, CA, United States

Abstract

We have studied the problem of adaptive cosine transform coding, and developed an original quantization algorithm which can minimize block artifacts. There are three features in our compression technique. The first feauture is variable quantization interval. The quantization interval is determined adaptively depending on the statistical characteristics of the block. In our technique, the number of AC components which are rounded off to zero by quantization is used for the quantization parameter. The second feature is the adaptive cutoff of the high frequency components of the transform coefficients. High frequency components may be ignored adaptively in our technique. The third feature is the double quantization algorithm. Non-adaptive quantization is carried out first. The second quantization is performed adaptively.

Citation Download Citation

Hisashi Yonekawa, Yoshiyuki Ishimitsu, Junichirou Akune, and Hiroshi Takeuchi "Adaptive Block Cosine Transform Coding Using A New Quantization Algorithm", Proc. SPIE 1093, Medical Imaging III: PACS System Design and Evaluation, (25 May 1989); https://doi.org/10.1117/12.953363

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