NOISE PROCESSOR FOR ACCUMULATION SIGNAL OF PHOTOELECTRIC CONVERSION ELEMENT

摘要

PURPOSE:To obtain an accurate accumulation signal corresponding to the luminance pattern of incident light, by using not only noise peculiar to each picture element of a photoelectric conversion but fixed noise including the noise due to an error between a firs and a second amplifier means, as a bit of information to add correction on the accumulation signal. CONSTITUTION:Firstly, when a various kinds of signals representing indication to start the accumulation operation of an image signal are sent from a microcomputer 3, the accumulation operation of the image signal is performed at a line sensor 1, and also, the peak signal Vp and the dark signal Vd of the image signal at that time are calculated, and those signals are outputted to a signal processing circuit 2. Next, when a signal representing the indication to send the accumulation signal (read image signal) is sent to the above stated line sensor 1 in order at every bit from the microcomputer 3, the line sensor 1 outputs the accumulation signal to the signal processing circuit 2 in order as the image signal Vo. Also, the microcomputer 3, when the said signal being inputted in order, selects the fixed noise corresponding to the bit at that time from an EEPROM which stores a bit of fixed noise information, and stores a value in which the share of the fixed noise is corrected in a RAN.