| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that the cost is increased considerably due to the increase in the circuit scale corresponding to the increase in the number of photoelectric converters (pixel arrays) in the case of applying the technique of a picture reading sensor obtained by assuming reading of a monochromatic picture to reading of a color picture as it is. SOLUTION: The picture reading sensor 1 has respective pixel arrays of R, G and B for reading color picture information and a pixel arrays for reading monochromatic picture information. Picture data LR, LG and LB obtained corresponding to the respective pixel arrays of R, G and B are converted to the monochromatic picture information L* by an RGB→L* conversion circuit 11. The circuit of the poststage compares monochromatic picture information LW obtained from the sensor 1 with the information L* obtained by the circuit 11 at the same reading position of an original to detect noise component such as black line generated on a reading picture due to stuck dust on a reading optical system. |
