Image signal coding device

Details Image signal coding device Image signal coding device

1994-10-20

1996-10-29

Rogers, Scott A.

Facsimile and static presentation processing

Facsimile

Auxiliary signal

358433, 382246, 382248, 382250, 382251, 348405, 348403, H04N 1413, H04N 1415

Patent

active

055702031

ABSTRACT:
An image signal coding device capable of attaining a high-speed coding operation without increasing a circuit scale. The image signal coding device includes a DCT section for performing two-dimensional orthogonal transform to each of plural pixel blocks obtained by dividing an image signal to generate a transform coefficient, a linear quantization section for linearly quantizing the transform coefficient by using given quantization characteristics to generate a quantized coefficient, and a variable length coding section for performing variable length coding to the quantized coefficient to generate code data. The image signal coding device further includes an effective region holding section for holding region information including a range of the transform coefficient to be linearly quantized by the linear quantization section and a range of the quantized coefficient to be coded by the variable length coding section.

REFERENCES:
patent: 5333013 (1994-07-01), Enari et al.
patent: 5335016 (1994-08-01), Nakagawa
"The JPEG Still Picture Compression Standard" Gregory K. Wallace et al., Communications of the ACM, Apr. 1991.

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