| 摘要 |
PURPOSE:To perform accurate measurement, by performing binary coding in such a way that the level of a photoelectric transducing signal of an optical image is shifted in synchronization with the repeating period of the photoelectric transducing of the optical image, or binary coded reference voltage level is switched. CONSTITUTION:Optical image information 1 of a material to be measured is transduced from light to electricity in a sensor part 2 in correspondence with a synchronization signal 3 from a clock part 17. Reference signals 20 and 21 are generated by reference voltage generating parts 18 and 19. Said signals 20 and 21 are switched by a switching part 22 based on a switching control signal 23 from the clock generating part 17. The electric signal 4 is converted into a binary coded signal by one of said reference signals 20 and 21. The AND operation is performed by a brightness signal 8 of the material to be measured, which is binary-coded in a time series, and a clock signal 9 which is generated in the clock generating part 17, in a counter 10. The clock pulses of the output are counted, and the size of the bright and dark part is measured. |
