Method and apparatus for classifying images and/or image regions based on texture information
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United States of America Patent
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Jul 20, 2004
Grant Date -
Aug 15, 2002
app pub date -
Dec 15, 2000
filing date -
Dec 15, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A document processing system and a method for classifying an input image or region thereof as either a synthetic graphic or a natural picture, is disclosed. The system includes an image input subsystem, a processing subsystem for processing image data provided by the image input subsystem, and software/firmware means operative on the processing subsystem for a) low-pass filtering image data representative of the input image or region thereof to produce low-pass filtered pixel values; b) determining a smoothness value for each of a plurality of low-pass filtered pixel values; c) generating histogram data from the smoothness values; d) determining a texture metric for the input image or region thereof from a subset of the histogram data; and e) thresholding the texture metric to classify the input image as either a synthetic graphic or a natural picture.
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