Method and system for compressing a pixel map signal using a hyb

Details Method and system for compressing a pixel map signal using a hyb Method and system for compressing a pixel map signal using a hyb

1995-06-27

1998-04-21

Boudreau, Leo

Image analysis

Image compression or coding

382240, 382166, 382239, 348390, G06K 900, G06K 936, H04N 712

Patent

active

057427070

ABSTRACT:
A pixel map signal is converted into a coefficient signal of block coefficient signals, each representing the pixels in a pixel map block (420) with the coefficients in a hybrid polynomial. The hybrid polynomial contains discrete cosine terms, a constant term separated from the discrete cosine terms, and polynomial terms. Each block coefficient signal contains a background component representing a coefficient of the constant term, a linear component representing the coefficients of a the polynomial terms, and a nonlinear component representing the coefficients of the discrete cosine terms. The background component represents constant, unchanging pixel values in a pixel map block (420), the linear component represents linearly changing pixel values in a pixel map block (420), and the nonlinear component represents nonlinear patterns in a pixel map block (420).

REFERENCES:
patent: 5122873 (1992-06-01), Golin
patent: 5510838 (1996-04-01), Yomdin et al.
patent: 5588069 (1996-12-01), Katayama et al.

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