| 摘要 |
PURPOSE:To make it possible to draw a small structure or a large structure clearly in accordance with a diagnozing purpose and to attain frequency processing prevented form the generation of false information by forming a signal selection control part for controlling plural calculating parts. CONSTITUTION:Transmitted light from an X-ray photographing film 1 is detected by a photomultiplier 4 and photoelectrically converted and the electric signal is converted into a digital picture image signal Dorg in each picture element through a logarithmic amplifier 6 and an A/D converter 7. The signal Dorg is temporarily recorded in a recorder 8, outputted and then inputted to any one of a medium calculating part 9 and an average value calculating part 10 by the signal selection control part 11. The signal Dorg is inputted from the recorder 8 to a frequency processing operation part 12 and any one of the medium value and average value is inputted as a non-clear mask signal Dus from the calculating part 9 or 10 to the operation part 12. Consequently, the operation part 12 executes the frequency processing operation and outputs a picture image signal D emphasized at its frequency component having a very low space frequency or more. |
