INTELLIGENT SCANNING IMAGE PICKUP SENSOR AND METHOD OF SCANNING PICTURE

摘要

PURPOSE: To reduce the scale of hardware and to shorten the processing time by providing a photosensing diode and a sample-and-hold unit to each of cell means. CONSTITUTION: When an integration period is finished, a sampling signalϕS is fed to a sample switch 37 and charges stored in a diode 34 are switched and fed to a sample-and-hold unit 35. When the operation above is once conducted, a precharge reset switch 38 sends a precharge signalϕR to set a specific junction capacitance of the diode 34 to a prescribed value. Thus, when a pixel video value is once sampled, a hold part of the unit 35 is immediately refreshed. An output section of the unit 35 is connected to a bus 32 via a row selection transfer gate 36 and the gate 36 transfers an analog cell value of the unit 35 to the bus 32 depending on the row select signal 40.