| 摘要 |
PURPOSE:To suppress the deterioration in the sharpness at a high spatial frequency region, by expanding the amplitude of a picture signal in the ratio in response to the spatial frequency of an original picture detected from the picture signal. CONSTITUTION:A picture signal obtained from a picture information reader (not shown) is converted into a digital code (a) in 4-bit expressing intermediate tone 16-level and inputted. A clock (b) synchronized with a picture signal (a) from an input terminal 9 is inputted, a reset pulse (d) is from an input terminal 11, and a latch clock (e) is inputted from an input terminal 13. Each input signal is applied to registers 5-8, an MSB change count circuit 10, and a latch circuit 12, a spatial frequency of an original picture is detected from the picture signal, and the amplitude of the said picture signal can be expanded in the ratio in response to the value of the spatial frequency. |
