Model-based dewarping method and apparatus
AssigneeCompulink Management Center, Inc.
InventorsMinghui Wu, Rongfeng Li, Wenxin Li, Edward P. Heaney, Jr., Karl Chan, Kurt A. Rapelje
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Abstract
An apparatus and method for processing a captured image and, more particularly, for processing a captured image comprising a document. In one embodiment, an apparatus comprising a camera to capture documents is described. In another embodiment, a method for processing a captured image that includes a document comprises the steps of distinguishing an imaged document from its background, adjusting the captured image to reduce distortions created from use of a camera and properly orienting the document is described.
Claims13
A computerized method for processing a captured image that comprises an imaged document, said computerized method comprising:
- isolating the imaged document from background of the captured image based on one or more lines corresponding to edges of the imaged document;
- setting a curved coordinate net for the imaged document;
- stretching the curved coordinate net to a rectangular coordinate net;
- calculating the deviation between the curved coordinate net and the rectangular coordinate net;
- and
- resampling pixels of the imaged document based on the calculated deviations.
A computer system for processing a captured image, the captured image comprising an imaged document, the computer system comprising:
- means for isolating the imaged document from background of the captured image based on one or more lines corresponding to edges of the imaged document;
- means for setting a curved coordinate net for the imaged document;
- means for calculating the deviation between the curved coordinate net and a rectangular coordinate net;
- and
- means for adjusting the rectangle coordinate net to a well-proportional rectangular coordinate net.
A computer system comprising one or more processors for processing a captured image comprising an imaged document, the computer system carrying one or more sequences of one or more instructions which, when executed by the one or more processors, cause the one or more processors to perform the computer-implemented steps of:
- isolating the imaged document from background of the captured image based on one or more lines corresponding to edges of the imaged document;
- setting a curved coordinate net for the imaged document;
- calculating the deviation between the curved coordinate net and a rectangular coordinate net;
- and
- adjusting the rectangular coordinate net to a well-proportional rectangular coordinate net.
A computer readable storage medium for processing a captured image comprising an imaged document, the computer readable medium carrying one or more sequences of one or more instructions which, when executed by one or more processors, cause the one or more processors to perform the computer-implemented steps of:
- isolating the imaged document from background of the captured image based on one or more lines corresponding to edges of the imaged document;
- setting a curved coordinate net for the imaged document;
- calculating the deviation between the curved coordinate net and a rectangular coordinate net;
- and
- adjusting the rectangular coordinate net to a well-proportional rectangular coordinate net.
Dependencies are inferred from the claim text.