Block transform coder for arbitrarily shaped image segments
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United States of America Patent
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Jun 6, 1995
Grant Date -
N/A
app pub date -
Oct 15, 1993
filing date -
Oct 15, 1993
priority date (Note) -
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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.
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