Image processing device

Details Image processing device Image processing device

1996-07-11

1999-03-23

Vu, Kim Yen

Facsimile and static presentation processing

Facsimile

Recording apparatus

3582613, 358426, 358427, 358432, 358433, 382248, H04N 1417, H04N 1415, H04N 141

Patent

active

058867902

ABSTRACT:
A device for processing image data for inputted image data composed of blocks, each of which has 64 pixels values arranged in a matrix. Each of the pixel values is inputted to one of first through fourth stages forming a pre-processing unit. Each of the stages has 16 addition and subtraction units. Four pixels positioned at predetermined locations in the matrix are inputted to a predetermined addition and subtraction unit, so that the four pixels are subjected to addition and subtraction, and a part of a two-dimensional DCT. Thus, 64 pre-processed DCT coefficients are obtained. The pre-processed DCT coefficients are inputted to the post-processing unit, in which the remaining part of the two-dimensional DCT and the quantization are performed, so that the quantization DCT coefficients are obtained.

REFERENCES:
patent: 5166987 (1992-11-01), Kageyama
patent: 5299025 (1994-03-01), Shirasawa
patent: 5311307 (1994-05-01), Yoshimoto
patent: 5333212 (1994-07-01), Ligtenberg
patent: 5657399 (1997-08-01), Iwabuchi et al.
patent: 5719958 (1998-02-01), Wober et al.
"Digital Signal Processing Handbook" 1st ed., Ohm Press, Tokyo, Japan on Jan. 31, 1993, pp. 70-82, and an English Translation thereof.

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