Video signal encoding method, video signal encoding apparatus, v

Details Video signal encoding method, video signal encoding apparatus, v Video signal encoding method, video signal encoding apparatus, v

1998-07-01

1999-10-26

Lee, Richard

Television

Bandwidth reduction system

Data rate reduction

348405, 348409, 348420, H04N 724, H04N 732

Patent

active

059737450

ABSTRACT:
In a video signal encoding method and apparatus, a video signal transmitting method, and the recording medium, hierarchical encoding of image data implies problems in that a compressing efficiency is reduced as the number of hierarchical levels is increased and that the image quality is degraded particularly in lower-level hierarchical images. After data D31, D33, D35 at respective hierarchical levels are generated by an average value calculation, pixel data which can be restored by arithmetic operations using pixel data at adjacent higher hierarchical levels and pixel data at their own hierarchical levels are thinned, and higher-level hierarchical data are compressively coded with larger numbers of quantization bits. Since the amount of pixel data to be transmitted can be reduced by the thinning, it is possible to suppress an increase in number of pixels to be transmitted, caused by the hierarchical structure. In addition, higher-level hierarchical data are assigned larger numbers of quantization bits, so that degradation in image quality due to quantization errors at the higher hierarchical levels can be reduced in lower-level hierarchical images.

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