Method and apparatus for image rotation with reduced memory usin

Details Method and apparatus for image rotation with reduced memory usin Method and apparatus for image rotation with reduced memory usin

1996-09-26

1998-05-12

Coles, Edward L.

Image analysis

Image transformation or preprocessing

Changing the image coordinates

382235, 382297, 382232, 358426, 3582613, 358432, 358433, G06K 932, G06K 936, H04N 141, H04N 1415

Patent

active

057518653

ABSTRACT:
The present invention is a method and apparatus for the rotation of images in conjunction with a block-wise, variable-length data compression operation. In a preferred embodiment, the rotation of image blocks on a microscopic level is accomplished independently from the rotation of the blocks themselves (macroscopic), stored in electronic precollation memory and the rotated image produced upon decompression of the stored rotated data. The two stage process allows the use of standardized JPEG or similar variable-length compression schemes, thereby accomplishing the rotation in conjunction with compression and minimizing the need for large memory buffers to accomplish image rotation

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patent: 5327248 (1994-07-01), Miller et al.
patent: 5408425 (1995-04-01), Hou
William P. Pennebaker et al; JPEG--Still Image Data Compression Standard; pp. 34 and 170.
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Michael Shneier and Mohamed Abdul-Mottaleb; Exploiting The JPEG Compression Scheme for Image Retrieval; IEEE Transactions on Pattern Analysis and Machine Intelligence; vol. 18 No. 8, Aug. 1996.
James D. Murray and William van Ryper; Encyclopedia of Graphics file formats; Jul. 1994; pp. 158-171 and 376-383.
Xerox Disclosure Journal; Michael J. Denber; Fast Small-Angle Bitmap Rotation; vol. 17 No. 5 Sep./Oct. 1992; pp. 391-392.
Xerox Disclosure Journal; Robert V. Lorenze, Jr.; Simple and Compact Method For Automated Duplex Printing Automated Duplex Printing; vol. 21, No. 1 Jan./Feb. 1996; pp. 17-18.

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