Image coding by use of discrete cosine transforms

Details Image coding by use of discrete cosine transforms Image coding by use of discrete cosine transforms

1993-11-30

1996-10-08

Vu, Kim Yen

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358433, 348403, H04N 1415

Patent

active

055637183

ABSTRACT:
Image coding methods and apparatus employing discrete cosine transforms for supressing and/or reducing blocking artifacts using a JPEG file format. The methods can be implemented on JPEG hardware slightly modified to provide access to discrete cosine transform coefficients. Filtering techniques by which an overlap procedure for implementing the inventive methods are also disclosed.

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