Apparatus and method for bidirectional scanning of video coeffic

Details Apparatus and method for bidirectional scanning of video coeffic Apparatus and method for bidirectional scanning of video coeffic

1996-10-28

1999-09-28

Moise, Emmanuel L.

Boots, shoes, and leggings

348404, 348419, 382250, G06F 1714, H04N 1102

Patent

active

059598727

ABSTRACT:
A bidirectional discrete cosine transform (DCT) coefficient scanning apparatus includes a buffer memory, an address generator based on a look-up table for converting a first address signal to a second address signal according to a DCT coefficient scan order, a first selection section for selecting the second address signal or a third address signal as the address signal for the buffer memory, and a second selection section for selecting a quantized DCT coefficient or a decoded DCT coefficient to be written to the buffer memory during coding or decoding. During coding, quantized DCT coefficients from a quantization section are written to locations in the buffer memory identified by the third address signal, and read out to a run-length and level coding section from locations in the buffer memory identified by the second address signal. During decoding, decoded DCT coefficients from a run-length and level decoding section are written to locations in the buffer memory identified by the second address signal, and read out to a dequantization section from locations in the buffer memory identified by the third address signal.

REFERENCES:
patent: 4933763 (1990-06-01), Chantelou
patent: 5005076 (1991-04-01), Stroppina et al.
patent: 5371811 (1994-12-01), Morrison et al.
patent: 5530478 (1996-06-01), Sasaki et al.
patent: 5666461 (1997-09-01), Igarashi et al.

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