Patent ID: 8525887

Claim:
An image pickup system for shooting a handheld document to obtain a document image, said image pickup system comprising: a display screen for showing a preview interface, wherein said preview interface comprises: a preview window for showing a pre-shot document image corresponding to said document; a positioning mark shown on said preview window, and comprising a first borderline, wherein said first borderline has a first length; and a document size window for providing a first-size document selective item and a second-size document selective item; an image pickup device for shooting said document; and a positioning program for judging whether said pre-shot document image is aligned with said positioning mark, wherein when said pre-shot document image is shown on said preview window, a window-entering message is shown on said preview window, wherein when said pre-shot document image is contacted with said positioning mark, an approaching message is shown on said preview window, wherein when a first image edge of said pre-shot document image is aligned with said first borderline and a first image edge length of said first image edge is equal to said first length, an aligning message is shown on said preview window and said image pickup device is activated to shoot said document to obtain said document image, wherein a distance between said document and said image pickup device is equal to a first focal length when said first-size document selective item is selected, said first image edge of said pre-shot document image is aligned with said first borderline and said first image edge length of said first image edge is equal to said first length, wherein said distance between said document and said image pickup device is equal to a second focal length when said second-size document selective item is selected, said first image edge of said pre-shot document image is aligned with said first borderline and said first image edge length of said first image edge is equal to said first length.