Method of sampling color video signal having alternating phase c

Details Method of sampling color video signal having alternating phase c Method of sampling color video signal having alternating phase c

1988-12-16

1990-07-10

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 19, H04N 944

Patent

active

049410350

ABSTRACT:
A method of sampling a color video signal arranged as a sequence of color frames provides identification of a selected one of the color frames. In a preferred embodiment, the method is directed to sampling a PAL-type color video signal in which each color frame includes multiple video image scan lines that have phase characteristics in one of two polarities. Samples of the color video signal are acquired during preselected first and second successive video image scan lines within one of the color frames in the sequence. The polarities of the samples are then identified to determine whether they correspond to the polarities of analogous video image scan lines during the selected color frame. The selected color frame is identified whenever the polarities of the sampled and the analogous video image scan lines are the same.

REFERENCES:
patent: 4052733 (1977-10-01), Derenbecher
patent: 4261008 (1981-04-01), Waller et al.

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