Image rotation assist circuitry and method
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United States of America Patent
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-
Oct 30, 2001
Grant Date -
Sep 6, 2001
app pub date -
Dec 3, 1998
filing date -
Dec 3, 1998
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A method and apparatus for assisting in the rotation of digital images is described. The digital image is divided by a separate process into image blocks which are rotated through a predetermined angle. Data moving hardware then processes the image blocks to determine the proper placement of each block in a frame buffer to create a properly rotated image. A set of predetermined values based on characteristics of the input image and the predetermined output image format is provided to the data moving hardware from a value processor. The data moving hardware performs only additions and subtractions. The only multiplication necessary for the method is performed by the processor prior to placement of the rotated image blocks in an output frame buffer. Thus the rate of processing the rotated image blocks is significantly improved.
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