Method for computing a control signal for combining digital imag

Details Method for computing a control signal for combining digital imag Method for computing a control signal for combining digital imag

1997-09-19

1999-11-16

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358450, 358540, 348586, H04N 140

Patent

active

059867710

ABSTRACT:
A method for determining a control signal for use in combining a first digital image that includes both a foreground region and a key color region having an associated key color with a second background digital image, both images including pixels having color values is disclosed. The method includes segmenting the first digital image into a foreground region and a key color region; and identifying transition region pixels in the first digital image that are in the vicinity of a boundary between the segmented foreground region and the segmented key color region. The method further includes computing a color difference signal between the color values of the first digital image and the key color for at least some pixels in the transition region; and computing a control signal for transition region pixels as a function of the color difference signal, where the control signal is to be used to combine the foreground region of the first digital image with the second background digital image.

REFERENCES:
patent: 4533937 (1985-08-01), Yamamoto et al.
patent: 5301016 (1994-04-01), Gehrmann
patent: 5436671 (1995-07-01), Gehrmann
patent: 5444496 (1995-08-01), Gehrmann
patent: 5455633 (1995-10-01), Gehrmann
patent: 5812214 (1998-09-01), Miller

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