Method and apparatus employing mean preserving spatial modulatio

Details Method and apparatus employing mean preserving spatial modulatio Method and apparatus employing mean preserving spatial modulatio

1993-10-27

1994-12-27

Rogers, Scott A.

Facsimile and static presentation processing

Natural color facsimile

Color correction

358519, 358523, 358530, H04N 146

Patent

active

053770412

ABSTRACT:
This invention minimizes the visibility of quantization artifacts associated with multi-dimensional color-calibration look-up tables of a limited size. Such artifacts occur when it is not practical to use interpolation methods to approximate color values which are intermediate to the color values stored in the look-up table. In such cases the input color signals are simply quantized for the purpose of addressing the look-up table. This invention works by applying local mean preserving spatial modulation to the input color image values prior to the quantization step. As with multi-level halftoning techniques, the result is that the appearance of intermediate color values is created because the observer will spatially average the output color values.

REFERENCES:
patent: 5050000 (1991-09-01), Ng
patent: 5162925 (1992-11-01), Takaoka et al.
patent: 5243443 (1993-09-01), Eschbach

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