摘要 |
PURPOSE:To eliminate phenomena of Moire, etc., which become visual obstacles so as to obtain pictures having a high sharpness, by performing area division with an amplitude intensity signal of a specific frequency component in a specific frequency component in a specific picture element and changing the process at every area. CONSTITUTION:Data corresponding to a necessary picture element in a line memory 1 are sent to an amplitude intensity detecting circuit 2, smoothing circuit 4, and sharpness emphasizing circuit 5. At the amplitude intensity detecting circuit 2, the amplitude intensity signal (b) of a specific frequency component to be detected in outputted. At the smoothing circuit 4 and sharpness emphasizing circuit 5, a smoothing signal (c) from which a specific frequency component is reduced, and a sharpness emphasizing signal (d) to which a specific frequency component is emphasized, are outputted, respectively. The amplitude intensity signal (b) is compared with a threshold TH at a comparator 3 and an area dividing signal (e) is outputted. A switch 6 selects the smoothing signal (c) and sharpness emphasizing signal (d) in accordance with the inputted area dividing signal (e) and uses the signal (d) as an output signal (f). |