Patent ID: 7809211

Claim:
A method for generating a computed image from a scanned image, comprising: electronically sensing a first image portion proximate to a scanning device, to thereby obtain a first scanned sub-image, the first scanned sub-image including pixel data for at least two pixels thereof; storing said first scanned sub-image as a first frame; electronically sensing a second image portion proximate to said scanning device, to thereby obtain a second scanned sub-image, the second scanned sub-image including pixel data for at least two pixels thereof; storing said second sub-image as a second frame; determining the amount, α, the image moves in a first direction relative to said scanning device between sensing said first scanned image portion and sensing said second scanned image portion by directly calculating the amount from a comparison of the pixel data for at least one pixel of said second frame with the pixel data for at least two pixels of said first frame; the first frame including a first pixel having an attribute value of A and a second pixel having an attribute value of B, the second frame including a first pixel having an attribute value of C, and further wherein: C=αB +(1−α) A; associating the amount of movement with pixel data for the entire second frame when said amount of movement is at least equal to a threshold distance; using said amount of movement and pixel data from said second frame to construct a third frame; and locating said third frame in the computed image of said scanned image.