| 摘要 |
<p>A contour emphasizing circuit in which VE and HE detected by a vertical contour component detecting unit (10) and a horizontal contour component detecting unit (12) are added by a first adder (14) and then multiplied by a coefficient, and the product is added to an input video signal by a second adder (16) to output an emphasized-contour video signal, the circuit comprises a comparing/judging unit (15) for comparing VE with HE and judging whether or not the absolute value of the difference between them is smaller than a preset value S, and a coefficient change-over multiplier unit (17) for changing the coefficient by which the sum (VE + HE) is multiplied over to K/2 or K according to the judgement signal. For a pixel from which both HE and VE are detected, the coefficient of the coefficient change-over multiplier unit (17) is changed from K over to K/2 by the judgement signal of the (15) to decrease the contour emphasizing component. This prevents excessive contour emphasis of the pixel from which both HE and VE are detected, and natural profile emphasis is carried out.</p> |
