Quick image processor of reduced circuit scale with high image q

Details Quick image processor of reduced circuit scale with high image q Quick image processor of reduced circuit scale with high image q

1994-09-26

1998-05-05

Bost, Dwayne

Image analysis

Image compression or coding

Quantization

382248, 348405, G06K 936, G06K 946

Patent

active

057487936

ABSTRACT:
A quick image processor of reduced circuit scale for carrying out compression and expansion of image data, including a quantization-inverse quantization device which executes a quantization of the image data using quantization steps corresponding to frequency components and an inverse quantization of decoded data using the quantization steps. The quantization-inverse quantization device includes a first shifter for executing a predetermined bit number shift of input data, an add-subtract device for adding or subtracting the output of the first shifter to or from the input data, a look-up table device for multiplying the input data by a multiple previously stored therein, and a second shifter for executing a predetermined bit number shift of either the output of the add-subtract device or the output of the look-up table device, resulting in carrying out ready IC fabrication and improving approximation accuracy of the quantization steps.

REFERENCES:
patent: 5070397 (1991-12-01), Wedderburn-Bisshop
patent: 5224062 (1993-06-01), McMillan
patent: 5255216 (1993-10-01), Blanz
patent: 5321522 (1994-06-01), Eschbach
patent: 5333212 (1994-07-01), Ligtenberg
patent: 5396291 (1995-03-01), Sanpei
patent: 5430556 (1995-07-01), Ito
patent: 5452104 (1995-09-01), Lee
patent: 5523847 (1996-06-01), Feig

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