Apparatus and method for forming a composite image pixel through

Details Apparatus and method for forming a composite image pixel through Apparatus and method for forming a composite image pixel through

1993-09-02

1995-08-22

Nguyen, Phu K.

G06F 1500, G06F 3153

Patent

active

054448352

ABSTRACT:
An apparatus for combining a foreground pixel signal and a background pixel signal according to a blending factor signal to generate a composite pixel signal comprises first, second, and third registers; a signal selecting multiplier; and at least one adder. The first, second, and third registers store the foreground pixel signal, the background pixel signal, and the blending factor signal, respectively. The signal selecting multiplier uses the signal within the third register to selectively shift and add the signals within the first and second registers, resulting in a compound pixel signal. Each adder is used to combine the compound pixel signal with a correction signal, producing an approximation signal. A subset of bits within the approximation signal correspond to the composite pixel signal.

REFERENCES:
patent: 4641255 (1987-02-01), Hobmann
patent: 4704605 (1987-11-01), Edelson
patent: 4982343 (1991-01-01), Hourvitz et al.
patent: 5003491 (1991-03-01), Heckt

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