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Proceedings Paper

Adaptive Block Cosine Transform Coding Using A New Quantization Algorithm
Author(s): Hisashi Yonekawa; Yoshiyuki Ishimitsu; Junichirou Akune; Hiroshi Takeuchi
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Paper 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.

Paper Details

Date Published: 25 May 1989
PDF: 14 pages
Proc. SPIE 1093, Medical Imaging III: PACS System Design and Evaluation, (25 May 1989); doi: 10.1117/12.953363
Show Author Affiliations
Hisashi Yonekawa, Konica Corporation (Japan)
Yoshiyuki Ishimitsu, Konica Corporation (Japan)
Junichirou Akune, Konica Corporation (Japan)
Hiroshi Takeuchi, Konica Corporation (Japan)


Published in SPIE Proceedings Vol. 1093:
Medical Imaging III: PACS System Design and Evaluation
Samuel J. Dwyer; R. Gilbert Jost; Roger H. Schneider, Editor(s)

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