Image correction apparatus
First Claim
1. An image correction apparatus for correcting an image of a document with a binding portion lifted differently between the top and the bottom of the document, comprising:
- edge detection means for detecting edges of the document;
binding position detection means for obtaining a binding position of the document;
reference line detection means for obtaining a reference line for the position of the document;
side slope angle computing means for computing slope angles of the top and bottom sides of the document on the basis of the reference line and the binding position;
three-dimensional edge position computing means for computing three-dimensional positions of upper and lower edges of the document on the basis of the edges and the slope angles; and
document shape computing means for computing a shape of a whole of the document on the basis of the three-dimensional positions of the edges.
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Accused Products
Abstract
An image correction apparatus 1 includes an image input device 3, a memory device 4, a central processing unit 2, and and image output device 5. In the image correction apparatus 1, a locally wrinkled document or a document with a binding portion lifted differently between the top and bottom of the document is read from the image input device 3 and, using a program which is run on the central processing unit 2, an input image is corrected for the geometric distortion and luminance variations caused due to the upper and lower sides of the document making a slope with respect to a document platen, and thereby, a flat document image is restored.
85 Citations
16 Claims
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1. An image correction apparatus for correcting an image of a document with a binding portion lifted differently between the top and the bottom of the document, comprising:
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edge detection means for detecting edges of the document;
binding position detection means for obtaining a binding position of the document;
reference line detection means for obtaining a reference line for the position of the document;
side slope angle computing means for computing slope angles of the top and bottom sides of the document on the basis of the reference line and the binding position;
three-dimensional edge position computing means for computing three-dimensional positions of upper and lower edges of the document on the basis of the edges and the slope angles; and
document shape computing means for computing a shape of a whole of the document on the basis of the three-dimensional positions of the edges. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification