Detection and phase lock of 2:2 and 3:2 pull-down video

Details Detection and phase lock of 2:2 and 3:2 pull-down video Detection and phase lock of 2:2 and 3:2 pull-down video

2004-12-21

2008-12-23

Ometz, David (Department: 2622)

Television

Basic receiver with additional function

Multimode

C348S448000

Reexamination Certificate

active

07468756

ABSTRACT:
Herein described is a system and method of detecting 2:2 and/or 3:2 pull-down video. In addition, aspects of the present invention provide a system and method to identify and lock onto a field phase of a received 2:2 or 3:2 pull-down video signal. The system for detecting a field phase in 2:2 pull-down video comprises a first circuitry that computes unexpected motion values, a second circuitry that implements an alternating straight through or crossover function, a third circuitry that performs processing and generates one or more control signals, a pair of counters, and a phase selection circuitry. The method comprises computing luminance approximations of pixels associated with an output video frame, computing one or more first differences, and computing a second difference for each absent pixel of the output video frame based on one of five field phases.

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