Method and apparatus for reducing quantization artifacts in a hi

Details Method and apparatus for reducing quantization artifacts in a hi Method and apparatus for reducing quantization artifacts in a hi

1994-09-30

1996-10-22

Boudreau, Leo

Image analysis

Image compression or coding

Predictive coding

348394, 358428, 382252, G06K 900

Patent

active

055685706

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.

REFERENCES:
patent: 4751742 (1988-06-01), Meeker
patent: 4816322 (1989-03-01), Pickering
patent: 4849810 (1989-07-01), Ericsson
patent: 5050230 (1991-09-01), Jones et al.
patent: 5341429 (1994-08-01), Stringer et al.
patent: 5412427 (1995-05-01), Rabbani et al.
patent: 5442458 (1995-08-01), Rabbani et al.

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