Image reading device capable of detecting abnormal pixels in white reference data

摘要

An image reading device includes a white reference member, reading device, and processor. The reading device includes lenses and light-receiving elements. The light-receiving elements output a plurality of pixel values based on a light reflected from the white reference member. Each lens corresponds to at least two light-receiving elements. Each light-receiving element is configured to receive a light reflected from the white reference member and passing through the corresponding lens and to output one pixel value. The processor acquires the pixel values by using the reading device, sets a target pixel, and determines that the target pixel is an abnormal pixel when an absolute value of difference between a pixel value of the target pixel and a pixel value of a first pixel is greater than a prescribed threshold. The first pixel is separated from the target pixel by an integer multiple of the predetermined lens-to-lens distance.

主权项

1. An image reading device comprising:
a white reference member; a reading device including a plurality of lenses and a plurality of light-receiving elements, the plurality of lenses being arranged in a predetermined direction at a predetermined lens-to-lens distance, each of the plurality of lenses having a predetermined diameter, the plurality of light-receiving elements being arranged in the predetermined direction, the plurality of light-receiving elements being configured to output white reference data including a plurality of pixel values for a plurality of pixels based on a light reflected from the white reference member, each of the plurality of lenses corresponding to at least two of the plurality of light-receiving elements, each of the plurality of light-receiving elements being configured to receive a light reflected from the white reference member and passing through the corresponding lens and to output one of the plurality pixel values based on the received reflected light; and a processor configured to:
acquire the white reference data by using the reading device;set each of the plurality of pixels as a target pixel; anddetermine that the target pixel is an abnormal pixel when an absolute value of difference between a pixel value of the target pixel and a pixel value of a first pixel is greater than a prescribed threshold, the first pixel corresponding to a light-receiving element that is separated from a light-receiving element corresponding to the target pixel by an integer multiple of the predetermined lens-to-lens distance.