Image data compression method, pattern model positioning method in image processing, image processing apparatus, image processing program, and computer readable recording medium
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United States of America Patent
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Jan 15, 2013
Grant Date -
Jun 14, 2012
app pub date -
Feb 17, 2012
filing date -
Aug 9, 2008
priority date (Note) -
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Abstract
There is provided a data compression method for increasing a reduction ratio, while keeping a sufficient characteristic amount, to seek speeding up of processing, the method being for compressing image data in pattern model positioning in image processing of searching out of an image to be searched and positioning a pattern model corresponding to a pre-registered image. The method includes the steps of: computing an edge strength image having edge strength information and an edge angle image having edge angle information with respect to each pixel constituting an image; transforming the edge angle image of each pixel into an edge angle bit image expressed by an edge angle bit indicating an angle with a pre-defined fixed width; and compressing the edge angle bit image to create an edge angle bit reduced image by taking a sum with respect to each edge angle bit.
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