Patent ID: 8873881

Claim:
A dust detection system, comprising: a receiver that receives image data, an imager generating said image data according to a captured optical image; a dust extraction processor that generates dust-image data by extracting sub-images of dust in said captured optical image on a basis of said image data; a memory that stores intrinsic-flaw image data corresponding to an intrinsic-flaw image, said intrinsic-flaw image including an intrinsic-flaw area determined based on a detected-flaw area, said detected-flaw area being an area where first sub-images of dust are detected by said dust extraction processor in an initializing operation, said first sub-images of dust being enlarged by an enlargement circuit to generate said intrinsic-flaw area from said detected-flaw area; and an image correction processor that generates corrected dust-image data based on said intrinsic-flaw image data and normal dust-image data, said corrected dust-image data corresponding to a corrected dust image, said normal dust-image data corresponding to a normal dust image including second sub-images of dust that said dust extraction processor extracts after said initializing operation, said corrected dust image being said normal dust image that said first sub-images of dust in said intrinsic-flaw image are deleted from.