| 摘要 |
A 2 frame difference signal suppression circuit prevents the detection of the 2 frame difference signals in motion detection signals. This circuit includes frame memories (1),(2) for outputting the previous frame data (D2)(D1), a subtractor (3) for subtracting the present frame data (D3) from the previous 2 frame data (D2) to obtain a difference, a subtractor (4) for subtracting the previous 1 frame data (D2) from the previous 2 frame data (D1), a subtractor (5) for subtracting the present frame data (D3) from the previous 2 frame data (D1), absolute value detection circuits (6)(7)(8) for detecting the output signal of (3)(4)(5), comparators (9),(10) for comparing the output signals of the circuits (6,7) with the threshhold voltages (T1),(T2), and And Gate (11).
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