Image coding apparatus for compressing image data

Details Image coding apparatus for compressing image data Image coding apparatus for compressing image data

1997-05-30

1999-05-18

Couso, Jose L.

Image analysis

Image compression or coding

Adaptive coding

382232, 382248, 382250, G06K9/36;9/46

Patent

active

059058137

ABSTRACT:
A data processor in an image coding apparatus includes a zero detecting circuit for determining if the quantized AC coefficients are zero or not; a counter, that is reset periodically, for counting the quantized AC coefficients that are not zero; a comparator for comparing the count of the counter and a first reference value, and outputting an AC coefficient eliminating signal when the count exceeds the first reference value; and a first logic circuit for forcibly replacing the quantized AC coefficients with zero based on the AC coefficient eliminating signal so that the volume of data of the quantized AC coefficients that are not zero is reduced. The image coding apparatus cuts off some portions for the images having a large volume of codings, and keeps the volume of data below a predetermined maximum.

REFERENCES:
patent: 5301032 (1994-04-01), Hong et al.

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