System for decomposition of NTSC color video signals using two f

Details System for decomposition of NTSC color video signals using two f System for decomposition of NTSC color video signals using two f

1985-04-29

1987-12-01

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 13, H04N 966

Patent

active

047108010

ABSTRACT:
NTSC composite color video signals captured in a freeze-frame videoconferencing system can be decomposed into luminance and chrominance components using simple digital addition and subtraction. The necessary apparatus includes a conventional color camera, an analog-to-digital converter, and a superframe buffer, organized into four field buffers. The analog signal is sampled at phase angles which are displaced at 135 degree increments. The preferred phase angles are 0, 135, 270, 45, 180, 315, 90 and 225 degrees relative to the phase of the color burst for the current scan line. Due to the reversal of the color burst phase on a frame-to-frame basis, a luminance or Y value can be obtained for each pel by adding the digital values stored in corresponding pel positions in corresponding fields (odd or even) in two successive frames of the same image. A chrominance or C value can be obtained by subtracting the same two values. The I and Q components of chrominance can be obtained directly as a result of the subtraction process at certain of the angles or indirectly through calculation at other of the angles.

REFERENCES:
patent: 4106053 (1978-08-01), Mayemchuk
patent: 4335395 (1982-06-01), Clarke
patent: 4498100 (1985-02-01), Bunting et al.
patent: 4500912 (1985-02-01), Bolger
patent: 4527188 (1985-07-01), Lewis

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