| 摘要 |
PURPOSE:To sufficiently improve the picture quality by changing the control method in accordance with the difference between an input picture element signal and a forecasted value. CONSTITUTION:When a picture signal Si including a distortion is inputted, it is successively stored in a storage circuit 30, and a forecasted value (y) is operated in a forecasting circuit 40 by the whole or a part of stored values. A subtractor 51 subtracts one output data x0 in the storage circuit 30 from the value (y) and outputs a subtraction value (d). In the case of d<=(threshold TH), a comparing circuit 54 connects a switch 55 to the side of a terminal 55a. Then, the subtraction value (d) is sent to an adder 56 through the switch 55 and is added to output data x0, and picture data Do is outputted. In the case of d>TH, the switch 55 is connected to the side of a terminal 55b. Then, a subtracting circuit 53 operates a correction value in accordance with the subtraction value (d) and an external input value Q and sends this correction value to the adder 56 through the switch 55. The adder 56 adds the correction value and output data x0 and outputs picture data Do. |
