| 摘要 |
PURPOSE:To use the limited dynamic range of an image pickup tube effectively as much as possible and to improve the picture quality by providing a processor for determining an input and output position of respective rod shape filters in plural steps and a driving part for realizing a wedge filter for displacing and driving the input and output position of the respective rod shape filters based on the output of this processor. CONSTITUTION:The processor 6 sets an avaluation area R with respectic to the same picture on a monitor 7, a safety ratio is optionally set based on an average video signal of this evaluation area R and a threshold level I is decided. The processor 6 feeds one dimentional arrays (z), (y) and the quantity Z (n) of a protrusion as information to the driving part 9. The driving part 9 passes the current corresponding to the Z (n) to an aluminium rod at the position corresponding to the (y, z) based on the Z (n) to drive a motor and push out to an instructed (x) position, namely, the quantity of the protrusion Z (n). According to such a means, the step like wedge filter 10 according to an object 2 is constituted and the above-mentioned operation is repeated on all lines (y=1 to ny). Thereby, a deformable and reproducible wedge filter can be realized. Thereby, the dynamic range of the image pickup tube can be effectively used to improve the picture quality. |
