System for compression and decompression of video data using dis

Details System for compression and decompression of video data using dis System for compression and decompression of video data using dis

1992-01-03

1993-03-02

Nguyen, Long T.

Boots, shoes, and leggings

36472416, G06F 738, G06F 1531

Patent

active

051915480

ABSTRACT:
A method and a structure provide discrete cosine transform (DCT) and its inverse (IDCT) using digital FIR filters in a filter bank. The filter bank of the present invention forms a structure of cascaded filters, in which data are communicated only between filters having "parent-child" relationships. Each filter in the filter bank is required only to communicate with at most two other filters in the filter bank. Consequently, in any implementation, both the communication overhead between filters in the filter bank, and the circuit size are minimized. Therefore, the filter bank is particularly suited for integrated circuit implementation. In one embodiment, the filter bank is implemented in an image compression and decompression integrated circuit using a structure which includes pipeline registers, adders and multipliers. In that embodiment, the filter bank provides an 8-point DCT in each of the two passes of a 2-dimensional DCT used in a data compression operation. The same structure also provides an 8-point IDCT in each of the two passes of the 2-dimensional IDCT used in an data decompression operation.

REFERENCES:
patent: 4152772 (1979-05-01), Sperser et al.
patent: 4196448 (1980-04-01), Whitehouse et al.
patent: 4293920 (1981-10-01), Merola
patent: 4791598 (1988-12-01), Liou et al.
patent: 4860097 (1989-08-01), Hartnack et al.
Matsumura et al., "An Array Processor for 2-D Discrete Cosine Transforms", Signal Processing III: Theory and Applications, Elsevier Science Publishers B.V. (North Holland) 1986 pp. 1283-1286.

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