Image analysis – Image compression or coding – Substantial processing of image in compressed form
Patent
1996-09-26
1999-02-02
Boudreau, Leo H.
Image analysis
Image compression or coding
Substantial processing of image in compressed form
382250, 382293, 382295, 382296, G06K 936, G06K 946, G06K 932
Patent
active
058675981
ABSTRACT:
The present invention is a method and apparatus for the processing of images that have been compressed using a discrete cosine transform operation, and particularly JPEG compressed images. In a preferred embodiment, the rotation of image blocks is accomplished by sign inversion and transposition operations to accomplish intrablock operations. Subsequently, one of a number of alternative methods is employed to accomplish the same image processing on an interblock level, thereby enabling the rotation or mirroring of compressed images. The two stage process allows the use of either a standardized JPEG system with enhancements or a hybrid processing method, thereby accomplishing the image processing in conjunction with compression or decompression operations and minimizing the need for large memory buffers to accomplish the image processing. Accordingly, the technique has application to any number of systems, including digital printers and copiers where there may be a necessity to orthogonally rotate or mirror the digital image.
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Basch Duane C.
Boudreau Leo H.
Novik Dmitry A.
Xerox Corporation
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