Abstract: In image scanning in which three lamps provided for Red, Green and Blue color components are switched successively and light transmitted through or reflected at an original is received by a CCD line photosensor, variation in lamp output light quantity with time and relative variations in output light intensity among the three lamps are corrected. In one embodiment, each lamp is turned off or operation of the CCD is terminated when the light quantity emitted from the lamp reaches a setup quantity. In a second embodiment, a voltage corresponding to the color component data obtained by the CCD is divided by a voltage corresponding to the effective light quantity emitted from each lamp.

Abstract: In a method for controlling magnification variation in which an original picture image is projected on a light receiving surface with a desired magnification, the projected picture image is moved in the sub-scanning direction which intersects the main scanning direction where the sensor is aligned, and the feeding speed (V) in the sub-scanning direction and the electric charge storage time are controlled.

Abstract: A pixel synchronizing signal between a picture input scanning apparatus and a reproduction record scanning apparatus is generated by dividing frequency of a reference signal according to scanning speed in the main scanning direction into a plurality of slightly different frequencies from one another by a plurality of dividers, pairs of the frequencies are converted into heterodyne frequencies by at least a pair of phase synchronizing loop circuits coupled with the heterodyne frequencies of mutual output frequencies thereof, and frequencies of output signals of the phase synchronizing loop circuits of which feeding back signals are the heterodyne frequencies among the phase synchronizing loop circuits are divided to make them output frequencies.

Abstract: The resolution of an array sensor can be increased by projecting images of picture elements, which lie on the same scanning line, on a plurality of one-dimensional array sensors composed of a number of photoelectric transducers arranged with an equal interval in a row; and then subjecting picture signals, which have been output respectively from the array sensors, to a combination processing so as to obtain continuous picture signals. It is possible, without using any memory unit, to output picture signals with a resolution higher than that available from the use of a single one-dimensional array sensor, namely, with a resolution proportional to the number of a plurality of one-dimensional array sensors.