Patent ID: 7208715

Claim:
A scanning method of an image scanner, said image scanner comprising an image sensing module for generating an electronic signal of an image of a scanned object, said image sensing module comprising a row of sensors and first, second and third light sources for emitting light of first, second and third colors respectively, said scanning method comprising steps of: simultaneously turning on said first and second light sources to have said sensors generate a first output image including first and second color images of said scanned object; simultaneously turning on said second and third light sources to have said sensors generate a second output image including second and third color images of said scanned object; simultaneously turning on said first and third light sources to have said sensors generate a third output image including first and third color images of said scanned object; and generating said first, second and third color images of said scanned object, wherein said first color image is obtained from first ⁢ ⁢ output ⁢ ⁢ image + second ⁢ ⁢ output ⁢ ⁢ image + third ⁢ ⁢ output ⁢ ⁢ image 2 - second ⁢ ⁢ output ⁢ ⁢ image said second color image is obtained from first ⁢ ⁢ ⁢ output ⁢ ⁢ image + second ⁢ ⁢ output ⁢ ⁢ image + third ⁢ ⁢ output ⁢ ⁢ image 2 - third ⁢ ⁢ ⁢ output ⁢ ⁢ ⁢ image said third color image is obtained from first ⁢ ⁢ output ⁢ ⁢ image + second ⁢ ⁢ output ⁢ ⁢ image + third ⁢ ⁢ output ⁢ ⁢ imgae 2 - first ⁢ ⁢ output ⁢ ⁢ image .