| 摘要 |
PURPOSE:To obtain a correcting data for an optical sensor, by providing a white color diffusion plate at the position of an original and binary coding and then storing the reflected light given from the diffusing plate. CONSTITUTION:A white color diffusion plate 3 is provided at the reading position of pictures, and the beams are irradiated from light sources 5a and 5b. The reflected light is detected by a photosensor 10 and digitized by an A/D converter to be stored in a memory. The memory is provided by an amount equivalent to a main scanning line of the sensor 10. That is, the memory stores the data in response to the variance of the sensor 10. This data is used to compensate the picture signal when an original 4 is actually read. This correction is carried out by reading the data out of the memory in response to the scan equivalent to a line. As a result, the photosensitive variance is eliminated for each photodetecting element of the sensor 10. Thus it is possible to reproduce pictures of good quality. |
