Cryptography – Key management – Having particular key generator
Patent
1993-05-18
1995-01-24
Barron, Jr., Gilberto
Cryptography
Key management
Having particular key generator
348404, 348420, 358433, 371371, 382 56, H04N 1415, H03M 730
Patent
active
053848497
ABSTRACT:
A method and apparatus for removing blocking artifacts in an encoder/decoder system. The encoder includes a delay device for delaying original input frame data, a decoder for decoding the compressed data and outputting the restored frame data, and a blocking artifact measurer which receives the restored frame data and the original frame data, and measures the degree of blocking artifact using the above two frame data so as to generate a predetermined post-processing parameter. The post-processing parameter is transmitted to the receiver/decoder together with the encoded data. The decoder includes a receiver for receiving the encoded data and the post-processing parameter, a second decoder for decoding and restoring the encoded transmission data, and a filter for adaptively filtering the restored data output from the second decoder according to the post-processing parameter. As a result, the blocking artifact of the block boundary is removed from the encoded data such that a user does not notice any reduction in the picture quality.
REFERENCES:
patent: 4754492 (1988-06-01), Malvar
patent: 5121216 (1992-06-01), Chen et al.
Barron Jr. Gilberto
Samsung Electronics Co,. Ltd.
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