Apparatus and method for compressing still images

Details Apparatus and method for compressing still images Apparatus and method for compressing still images

1995-08-10

1997-01-14

Johns, Andrew

Image analysis

Image compression or coding

382303, G06K 936

Patent

active

055948120

ABSTRACT:
Transforms such as the DCT are useful for image compression. One close relative of the DCT is preferred for its arithmetic simplicity. A method and apparatus is described whereby the quantization operates with speeds comparable to 16 bit transforms yet the mean squared error is comparable to that of a 32 bit transform. The factorability of the transform into a relatively rapid set of additions and a set of multiplications permits an efficient pipelined data flow wherein the addition sections of the vertical and horizontal transforms are performed by the same hardware prior to a final multiplication.

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