Run length encoder

Details Run length encoder Run length encoder

1997-06-13

2000-04-25

Le, Vu

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

348410, 348420, 375246, 375253, 382245, 382246, H04B 166, H04N 712, G06K 936

Patent

active

060552727

ABSTRACT:
A run length encoder for encoding DCT coefficients obtained in a DCT, a quantization, and a scanning steps in block units to output an encoded (run, level) symbol, and outputting a predetermined (run, level) symbol if the obtained DCT coefficients of the block unit are all zero, comprises a run length encoding core for receiving the DCT coefficients and outputting the (run, level) symbol; a zero coefficient detector for detecting whether the DCT coefficients are `0` or not; a zero block detector for receiving an output from the zero coefficient detector to detect whether all of the DCT coefficients of each block are `0` or not; and an output selector for selecting the 2-dimensional symbol outputted from the run length encoding core to output a (run, level) symbol or a predetermined (run, level) symbol, if the block determined in the zero block detector is non-zero or zero block, respectively.

REFERENCES:
patent: 4626829 (1986-12-01), Hauck
patent: 5589829 (1996-12-01), Astle
patent: 5701364 (1997-12-01), Kanno
patent: 5764357 (1998-06-01), Dockser

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