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.