Code-amount control device and video coding device including the

Details Code-amount control device and video coding device including the Code-amount control device and video coding device including the

1998-02-25

2000-07-18

Tung, Bryan

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

348405, 348419, H04N 730

Patent

active

060917741

ABSTRACT:
The invention is directed to provide a code-amount control device for use in video-coding device, which controls the generated code-amount of each block (block length) after variable-length coding in the video-coding process to surely be less than the designated target code-amount. The code amount control device is provided with a rate control circuit for setting a target code-amount of each of blocks to be encoded, a rounding circuit for converting a sequence of quantized values into a set of the number of continuous zeroes and following thereto non-zero quantized values and a code-length table containing variable code-length values to be allocated to respective sets of the number of continuous zeroes and non-zero values. Before variable-length encoding of the image block, the rounding circuit estimates by accumulating the code length of each block with reference to the code-length table and outputs the quantized values as they are to a variable-length coding circuit when the accumulated code-length does not exceed the target code-amount. If the estimated code-length exceeds the target code-amount, the rounding circuit outputs the quantized values after rounding off the excessive portion thereof.

REFERENCES:
patent: 5606371 (1997-02-01), Klein Gunnewiek
patent: 5805222 (1998-09-01), Nakagawa
patent: 5880785 (1999-03-01), Fujiwara

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