Encoding documents using pixel classification-based...

Details Encoding documents using pixel classification-based... Encoding documents using pixel classification-based...

2004-09-07

2009-08-11

Ahmed, Samir A. (Department: 2624)

Image analysis

Image compression or coding

Reexamination Certificate

active

07574055

ABSTRACT:
A method for JPEG encoding an image that includes preprocessing steps performed prior to a JPEG compression step. The preprocessing steps include transforming block image data, using a variable quantization table selected for each block according to the classification of pixels in that block to produce quantized image data, and inverse transforming the quantized image data to produce filtered image data.

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