Image processing methods and apparatus for separable, general affine transformation of an image
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United States of America Patent
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Apr 10, 2001
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app pub date -
Feb 20, 1998
filing date -
Feb 20, 1998
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Abstract
A separable, general affine transformation according to the invention permits an image to be concurrently rotated, scaled, translated, skewed, sheared, or otherwise transformed via a sequence of one-dimensional transformations. A general affine transformation of an image in two dimensions is achieved by generating an 'intermediate' image via affine transformation of the source along a first axis. The intermediate image is then subjected to affine transformation along a second axis, e.g., perpendicular to the first. The resultant image may be used in place of that which would be produced by a single two-dimensional transformation of the source image (e.g., in a single pass).
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