Coding apparatus and coding method of time-varying image signal

Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal

Reexamination Certificate

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C375S240140, C375S240150

Reexamination Certificate

active

06885704

ABSTRACT:
A picture counter205counts and outputs the number of pictures input from the beginning of communication. A coding controlling section206outputs coding scheme information for controlling a coding apparatus to perform intra-coding when a counted value on the picture counter205is equal to or less than a predetermined value (N), and outputs coding scheme information for motion compensation prediction scheme when the counted value is more than N. Moreover, when the counted value is equal to and less than (N−1), the coding controlling section206outputs a signal for controlling a quantization section210to make the value of a quantization parameter large to the quantization section210, and when the counted value is N, the coding controlling section206outputs a signal for controlling the quantization section210to make the quantization parameter small to the quantization section210. A switch207is switched to “0” in case of the intra-coding and is switched to a frame memory203in case of the compensation prediction scheme in conformity with a signal of the coding controlling section206.

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