Overlapped field detecting apparatus capable of detecting...

Details Overlapped field detecting apparatus capable of detecting... Overlapped field detecting apparatus capable of detecting...

2005-12-06

2005-12-06

Vo, Tung (Department: 2613)

Pulse or digital communications

Bandwidth reduction or expansion

Television or motion video signal

C348S700000

Reexamination Certificate

active

06973129

ABSTRACT:
In an overlapped field detecting apparatus, a delay unit delays a video signal, and a subtracter calculates a difference between the video signal and an output signal of the delay unit on a pixel-by-pixel basis. Also, an absolute value circuit calculates an absolute value of the difference on a pixel-by-pixel basis. Further, at least one comparator compares the absolute value of the difference with a threshold value on a pixel-by-pixel basis, and at least one accumulator counts a number of pixels when the absolute value of the difference is larger than the threshold value. A determination unit determines whether or not the number of pixels is larger than a definite value, thus determining that corresponding fields of two successive frames of the video signal are non-overlapped.

REFERENCES:
patent: 5245424 (1993-09-01), Yoshida
patent: 6490497 (2002-12-01), Mitsuhashi et al.
patent: 6611286 (2003-08-01), Terasawa et al.
patent: 9-55879 (1997-02-01), None
patent: 11-88893 (1999-03-01), None

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