In a document reading apparatus having a scanning exposure reading system by which a document placed on a platen is scanning exposed by an optical system and a document image is read out, or a document reading system by which a moving document is read out by an optical system, at the first collection position and the second collection position which are different in the sub-scanning direction of the scanning expose on a reference density plate, the first shading correction data and the second shading correction data are respectively read in the main scanning direction, and the shading position is corrected on the basis of the read first and second shading correction data.

 
Web www.patentalert.com

< Efficient implementation of a noise removal filter

< Method and apparatus for standardized fluorescence image generation

> Adaptive contrast enhancement method using time-varying nonlinear transforms on a video signal

> Information processing apparatus, image input apparatus, method of controlling image processing apparatus, method of controlling image input apparatus, image input system, and storage medium

~ 00298