JP2003198813A5 - - Google Patents

Claims (10)

A plurality of channels, a light receiving unit capable of receiving light from the subject, and a light-shielded light-shielding unit corresponding to the plurality of channels, the first signal output from the light-receiving unit and the light-shielding unit Imaging means for outputting each output second signal for each channel;
Rearrangement means for rearranging signals output from the imaging means for each channel in a predetermined order;
Based on the second signal and the third signal output from the light receiving unit in a state in which light is not incident on the light receiving unit, the first signal is disposed after the rearranging unit. Signal correction means for correcting the signal level of
An image reading apparatus comprising:   The image reading apparatus according to claim 1, wherein the signal correction unit corrects the first signal based on the second signal after correcting the first signal based on the second signal.   The signal correction means corrects the third signal based on the second signal, and corrects the first signal based on the corrected third signal. The image reading apparatus described.   The image reading apparatus according to claim 1, wherein the signal correction unit corrects an offset level of the first signal.   In the case where a plurality of document images are read by the image capturing unit and a moving unit that relatively moves the document as the subject and the image capturing unit, the signal correction unit performs the second correction between the plurality of documents. The image reading apparatus according to claim 1, further comprising a control unit that performs control so as to correct the first signal based on a signal.   6. The apparatus according to claim 1, further comprising: a light source that irradiates the subject, wherein the third signal is a signal output from the light receiving unit when the light source is turned off. Image reading device.   7. The apparatus according to claim 1, further comprising a conversion unit that converts an analog signal output from the imaging unit into a digital signal, wherein the signal correction unit corrects the digital signal converted by the conversion unit. The image reading apparatus according to any one of the above.   The image reading apparatus according to claim 1, wherein the imaging unit includes a plurality of chips, and the channel is provided for each chip. A plurality of channels, a light receiving unit capable of receiving light from a subject, and a light-shielded light-shielding unit corresponding to the plurality of channels, the first signal output from the light-receiving unit and the light-shielding unit A signal correction method for an image reading apparatus having imaging means for outputting each output second signal for each channel,
The signals output from the imaging means for each of the channels are rearranged in a predetermined order, and the second signal and the third signal output from the light receiving unit in a state in which light does not enter the light receiving unit. And correcting the signal level of the first signal based on the above.   The program for performing the signal correction method of Claim 9 by computer control.