Image reading apparatus and method, image forming apparatus, and computer-readable medium

Abstract

An image reading apparatus includes a document cover, a cover state detector that detects whether the document cover is open or closed, an image reading unit that reads an image by conducting an optical scan that moves a scanning body with a mounted light source, detecting reflected light from the target object with a photoelectric transducer, and outputting a signal expressing the detected pixel densities, a white reference plate used as a reference for correcting an image, a power manager that switches between a power-saving state and a standby state, and a controller that controls the respective units such that in the case of restoring the standby state due to detecting the opening or closing of the document cover, an image of a document is read to detect the document size, and an image of the white reference plate is read after the detection to acquire correction values.