| 摘要 |
A moving picture plane is composed with a still picture plane and a graphics plane to obtain a composite image plane in a graphics generator. A moving picture area, a still picture area and a graphics area of the composite image plane are specified and detected as binary detection signals on the basis of drawing area indicating information transmitted from a broadcast side or the signal level or composite rate of each image plane before the composition in a drawing area detecting circuit. The detection signals are composed with one another in the levels corresponding to the areas to generate a multivalued composite detection signal in a detection signal composing circuit. On the basis of the composite detection signal, the contrast, the enhancement of high band components of the luminance signal and the amplitude of the speed modulation signal are controlled every drawing area of a moving picture, a still picture and graphics. When the video signal of the moving picture plane and the video signals of the non-moving picture planes such as a still picture plane, and a graphics plane are composed with one another and then the composite display is displayed on a display, the optimum image quality can be achieved in each of the moving picture area and the non-moving picture area of the composite image plane. <IMAGE> |
