Patent ID: 6973129
Filing Date: 2005-12-06
Classification: H04N

Abstract:
1. An overlapped field detecting apparatus comprising: a delay unit for delaying a video signal; a subtracter, connected to said delay unit, for calculating a difference between said video signal and an output signal of said delay unit on a pixel-by-pixel basis; an absolute value circuit, connected to said subtracter, for calculating an absolute value of said difference on a pixel-by-pixel basis; at least one comparator, connected to said absolute value circuit, for comparing the absolute value of said difference with a threshold value on a pixel-by-pixel basis; at least one accumulator, connected to said comparator, for counting a number of pixels when the absolute value of said difference is larger than said threshold value; and a determination unit, connected to said accumulator, for determining whether or not the number of pixels is larger than a definite value, thus determining that corresponding fields of two successive frames of said video signal are non-overlapped.