Faster lossless rotation of JPEG images
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United States of America Patent
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Nov 16, 2004
Grant Date -
Mar 13, 2003
app pub date -
Jul 2, 2001
filing date -
Jul 2, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Image rotations of 90.degree., 180.degree. and 270.degree. and horizontal and vertical mirroring image transformations are performed losslessly and with greatly enhanced speed by processing orthogonal transform coefficients in a zig-zag order with direct storage of S (size) values, reassociated R (run of zero valued coefficients) from an adjacent coded orthogonal transform value and a non-zero valued transformation coefficient in reverse zig-zag order. Cache misses are avoided by processing values which are not widely separated in the coded data and other features of the technique and memory accesses are reduced to accelerate processing while extremely little computation is required. These effects are substantially augmented when intermediate codes having certain attributes including coding of zero valued coefficients and flagging certain code features are employed.
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