Circuit and method for reducing flicker

Details Circuit and method for reducing flicker Circuit and method for reducing flicker

1997-10-22

1999-04-06

Flynn, Nathan

Television

Format conversion

Field rate type flicker compensating

348910, H04N 701

Patent

active

058925511

ABSTRACT:
A flicker reducing circuit that can prevent a degradation of an image by performing an outline blur correction together with a flicker reduction. In the flicker reducing circuit, a vertical contour detecting circuit detects an outline of the vertical component of a horizontal straight line. A switch selects an addition signal from the vertical low-pass filter for a period during which it is judged that an outline corresponds to the vertical component of a horizontal straight line according to the detection signal. The addition signal is obtained by adding the low-frequency component of a spatial frequency in a vertical direction to an output signal from the differentiating circuit. During other periods, the switch selects a delay display signal not subjected to a filtering process, output from the delaying circuit. Thus, a display signal processed for flicker reduction and blur correction can be output only to a flicker noticeable area such as one horizontal line in graphic data, in addition to character displaying positions.

REFERENCES:
patent: 5227879 (1993-07-01), Morita et al.
patent: 5510843 (1996-04-01), Keene et al.
patent: 5708480 (1998-01-01), Bromba et al.

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