Method for compositing a source and destination image using a ma

Details Method for compositing a source and destination image using a ma Method for compositing a source and destination image using a ma

1992-05-08

1995-01-03

Ro, Bentsu

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

348659, H04N 1387

Patent

active

053791290

ABSTRACT:
This invention provides a method for compositing a source image and a destination image using a mask image to produce a result image in a digital image processing system. The method is, on a pixel-by-pixel basis, using the mask image to select between the source and destination images: where a black color value for a mask pixel selects the color value of the corresponding pixel of the source image; and a white color value for a mask pixel selects the color value of the corresponding pixel of the destination image; and where an intermediate color value for a mask pixel selects a weighted average between source and destination pixel color values. The calculations of the weighted average color value are done in color space, such as on a color component by color component basis. The result image can be displayed or stored for further use. This method can be described in boolean expression according to the formula:

REFERENCES:
patent: 4617592 (1986-10-01), MacDonald
patent: 4779135 (1988-10-01), Judd
patent: 4896208 (1990-01-01), Moriya et al.
patent: 4954912 (1990-09-01), MacDonald et al.
patent: 5086434 (1992-02-01), Abe et al.
patent: 5226098 (1993-07-01), Hirosawa
patent: 5267333 (1993-11-01), Aono et al.

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