Method and apparatus for reducing quantization artifacts in a hierarchical image storage and retrieval system
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United States of America Patent
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Oct 22, 1996
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app pub date -
Sep 30, 1994
filing date -
Sep 30, 1994
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Abstract
The system and method reduces the quantization artifacts in the addition and removal of a digital watermark to and from a selected resolution image of a hierarchical image storage system where the watermark removal record is placed in a higher resolution image component. For those applications where preserving the image quality of a higher resolution image component is more critical than preserving the image quality of a lower resolution image component, the low-resolution image is modified according to the teachings of the present invention to minimize and in many cases eliminate the quantization artifacts at the higher resolution component.
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