Block transform coder for arbitrarily shaped image segments

Details Block transform coder for arbitrarily shaped image segments Block transform coder for arbitrarily shaped image segments

1993-10-15

1995-06-06

Boudreau, Leo H.

Image analysis

Image compression or coding

348395, 348420, 358433, G06K 900

Patent

active

054229634

ABSTRACT:
A Transform Coder Unit (TCU) to transform an arbitrarily shaped image into optimal transform coefficients (OTC) for data transmission. The TCU comprises a forward transform which transforms the image to transform coefficients, and a TCS generator which generates a transform coefficient set (TCS) from the transform coefficients. The TCU also contains an inverse transform which transforms the TCS to a computed region block having computed pel values. Finally, the TCU comprises a replacer which replaces those computed pel values corresponding to the interior pel set with the original pel values to form a modified computed region block which is re-iterated until optimal transform coefficients are determined. The present invention is also directed at a process for determining optimal transform coefficients using the aforementioned device.

REFERENCES:
patent: 5295201 (1994-03-01), Yokohama
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S. Chang and D. G. Messerschmitt. Transform Coding of Arbitrarily-Shaped Image Segments. In Proceedings of ACM Multimedia, Aug. 1993.
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ISO/IEC JTC1/SC29/WG11 MPEG 92/699, "Project Description for Very-Low Bitrate A/V Coding," Nov. 5, 1992.
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