| 摘要 |
A method is provided for analyzing an image comprising a plurality of image pixels to detect distortion within the image. The method comprises a first step of receiving image data for the image, and defining a plurality of blocks within the image data, each block comprising a plurality of adjacent image pixels; a second step of prestoring in a machine readable storage medium a plurality of template data for template pixels corresponding to the image pixels, each of the image pixels having a corresponding center template pixel; a third step of testing each of the image pixels within each of the blocks for a match with the template data, the testing including selectively and iteratively offsetting the template data relative to the center template pixel, and comparing the image pixel under test to each of the offset template data to obtain error statistics; and a fourth step of using the error statistics to select an offset for each of the blocks which provides an optimum match of the image data in a given block to the template data. An apparatus also is provided. The apparatus comprises input circuitry for receiving image data for the image from the image source, a storage medium for storing template data; and a processor for testing each of the image pixels within each of the blocks for a match with the template data. The processor preferably includes a plurality of programmable gate arrays.
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