Fingerprint elastic deformation correction method and device
A technology of elastic deformation and fingerprints, which is applied in the direction of instruments, character and pattern recognition, computer parts, etc., can solve the problems of non-elastic deformation and propose special correction methods, etc.
Inactive Publication Date: 2011-01-19
合肥方程式电子科技有限公司
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[0005] In the resource-constrained fingerprint recognition application, only the rigid deformation of the fingerprint is corrected, and no special correction method is proposed for the elastic deformation
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[0107] The fingerprint elastic deformation correction method obtains the elastic deformation correction parameters by processing the projection image information of the three-dimensional fingerprint curved surface on the two-dimensional plane, and corrects the characteristic information of the fingerprint to be tested through the elastic deformation correction parameters, so as to reduce the characteristic information caused by the influence of the fingerprint elastic deformation. Point information (feature point direction, feature point coordinates) error, thereby improving the accuracy of fingerprint recognition. The implementation of the method is simple, and is beneficial to use in resource-constrained environments, such as embedded processing and integrated circuit design fields.
[0108] Fingerprint elastic deformation correction is an intermediate process in the automatic fingerprint identification process, and its position in the fingerprint identification process is as...
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The invention relates to a fingerprint elastic deformation rectification method and device, and comprises blocking of the fingerprint; selecting central points of the central template image and the to-be-measured fingerprint image; Seeking for characteristic points with the nearest distance to the central points as vertexes and base points of the triangle matched with the template; and the vertexes and base points of the triangle matched with the to-be-measured fingerprint. Determining where the two matched triangles are inter-matched; taking the orthocenter of the matched triangle as the reference point for elastic deformation rectification; determining parameters of initial elastic deformation rectification; determining parameters of the elastic deformation rectification; and carrying out elastic deformation rectification for characteristic data of the to-be-measured fingerprint using the rectifying parameters after two-dimensional spatial domain filtering. The fingerprint elastic deformation rectification parameters are derived through analyzing differences of digitalized information between the to-be-measured sample and the fingerprint template. The elastic deformation of the to-be-measured sample is rectified in accordance with the rectifying parameters, so the fingerprint matching accuracy is increased, and error rate and rejection rate of finger matching is decreased.
Description
technical field [0001] The invention relates to an automatic fingerprint identification system, in particular to a method and device for correcting elastic deformation of fingerprints. Background technique [0002] Automated fingerprint identification system (AFIS for short) has a wide application background. At present, the research on automatic fingerprint identification system mainly has four aspects, namely, image enhancement, fingerprint classification, fingerprint feature extraction and detail matching. The block diagram of the fingerprint identification system is as follows: figure 1 shown. Among them, the processing of fingerprint deformation is concentrated in the detail matching, and the process is mainly the deformation correction of the feature information of the sample to be tested and the matching degree calculation of the feature points within the matching threshold. The prior art mainly solves the problem of rigid deformation of fingerprints, and does not p...
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IPC IPC(8): G06K9/00
Inventor 贺新
Owner 合肥方程式电子科技有限公司