| 摘要 |
<p>A contour emphasizing circuit in which VE and detected by 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 judging signal. For a pixel from which both HE and VE are detected, the coefficient change-over multiplier 17 is changed from K or K/2 by judgement signal of the comparing/judging unit 15 to decrease the contour emphasizing component. This prevent excessive contour emphasis of the pixel from which both HE and VE are detected, and natural profile emphasis is carried out. <IMAGE></p> |
