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US 7,689,004 B2Granted
Method and apparatus for evaluating the quality of document images
AssigneeSeiko Epson Corporation
InventorsBrian Keng, Hui Zhou
Life of this patent
Estimating the term…
Abstract
A method of evaluating the quality of an image of a document comprises examining the image to determine if the image satisfies at least one parameter-based image metric and examining the image to determine if the image satisfies a plurality of order-dependent image metrics.
Claims21
A method of evaluating the quality of an image of a document comprising:
- using a computer processing unit to perform the following:
- examining the image to determine if the image satisfies at least one parameter-based image metric;
- and
- examining the image to determine if the image satisfies a plurality of order-dependent image metrics;
- and
- wherein during examining of the image to determine if the image satisfies a plurality of order-dependent image metrics, said image is examined firstly to detect the existence of a frame surrounding the document, then to detect document skew, and then to detect at least one of (i) folded or torn document corners, (ii) folded or torn document edges, (iii) the existence of a carbon strip on the document and (iv) document piggyback;
- and
- wherein frame existence detecting comprises:
- determining a bounding region delineating the document in the image;
- and
- comparing the size of the frame surrounding said bounding region with a threshold to determine if said frame exceeds a frame size limit.
8 more elements
An apparatus for evaluating the quality of an image of a document comprising:
- a parameter-based metrics evaluator examining the image to determine if the image satisfies at least one parameter-based image metric;
- and
- an order-dependent metrics evaluator examining the image to determine if the image satisfies a plurality of order-dependent image metrics;
- and
- said order-dependent metrics evaluator examines the image firstly to detect the existence a frame surrounding the document, then to detect document skew, and the to detect at least one of (i) folded or torn document corners, (ii) folded or torn document edges, (iii) the existence of a carbon strip on the document and (iv) document piggyback;
- and
- wherein frame existence detecting comprises:
- determining a bounding region delineating the document in the image;
- and
- comparing the size of the frame surrounding said bounding region with a threshold to determine if said frame exceeds a frame size limit.
7 more elements
Dependencies are inferred from the claim text.