System for performing coordinate transformation of source image data
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United States of America Patent
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Jun 27, 1995
Issued Date -
N/A
app pub date -
Jul 27, 1993
filing date -
Jun 14, 1989
priority date (Note) -
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Abstract
An image data processing system which includes an image memory and an image processor for performing coordinate transformation of source image data expressed by two dimensional coordinates. The image processor includes image memory in which data of source and destination images are stored, a coordinate calculator which calculates at least x and y addresses at a position of a pixel in the source image on the basis of x and y addresses at a position of an associated pixel in the destination image, an interpolation calculator which calculates a pixel value of the destination pixel position through interpolation of source pixel values in the vicinity of the corresponding position in the source image, and a cache apparatus which holds therein part of the pixel values of the source image stored in the image memory, wherein the x and y addresses of the corresponding pixel position of the source image are used as tag and as an index for the cache apparatus respectively, whereby the high rate of the cache apparatus can be increased and the entire processing speed of the image data processing system can be increased.
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