Palm locating and center area extraction method of three-dimensional palm print identity identification system
An identity authentication and extraction method technology, applied in the field of image positioning and extraction, can solve problems such as affecting the correct rate of identity authentication, and achieve the effect of improving computing speed and saving storage space.
Inactive Publication Date: 2010-06-02
HARBIN INST OF TECH
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[0002] The traditional two-dimensional palmprint identification system uses the camera to obtain the grayscale image of the palm for identification. This method is easily affected by light, and the painting on the palm may affect the accuracy of identification.
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[0019] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0020] figure 1 It is a palmprint point cloud image calculated by projecting structured light onto the palm and using multiple phase-shifted images. The data is composed of point clouds represented by (x, y, z), but the arrangement of point clouds is regular. Project the 3D point cloud onto the X-Y plane, and all the points will be distributed like chess pieces on a chessboard, and the distance between adjacent points is equal, forming a regular rectangular distribution as a whole. Therefore, the 3D point cloud can be projected onto the matrix D 3 (m, n), where D 3 (i, j) represents the Z value of the i-th row and j-th column, that is, the distance between the sampling point and the reference plane, where m and n represent the length and width of the three-dimensional palmprint point cloud data respectively.
[0021] figure 2 It is the rendering of...
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The present invention provides a palm positioning and central area extraction method for three-dimensional palmprint identity authentication system. First of all, well-defined three-dimensional palmprint cloud data is acquired, and the data is mapped onto a matrix of the same length and width as a dual-dimensional image for point-to-point alignment of the three-dimensional and two-dimensional images. On the two-dimensional palm image to be attended, two characteristics between the fingers and the palm are found. By utilizing the two-dimensional palmprint identification center area positioningalgorithm, four pixel coordinates in a center area are found and the three-dimensional palmprint cloud data is obtained. Based on the way cloud data is arranged, the three-dimensional palmprint data is mapped onto the corresponding two-dimensional matrix to come up with the three-dimensional cloud coordinate. Through changing coordinate, rotating and interpolation method, the central area is extracted out of the three-dimensional cloud. The invention can effectively save storage space and speed up calculation by locating the three-dimensional palmprint cloud coordinate, extracting the centralpoints from plentiful three-dimensional palmprint cloud data, and eliminating redundant data points.
Description
(1) Technical field [0001] The invention relates to image positioning and extraction technology, in particular to palm positioning and center area extraction in a three-dimensional palmprint identification system. (2) Background technology [0002] The traditional two-dimensional palmprint identification system uses the camera to obtain the grayscale image of the palm for identification. This method is easily affected by light, and the painting on the palm may affect the correct rate of identification. Three-dimensional palmprint identification is a brand-new human biometric identification technology, which uses image-based precision measurement technology to obtain the depth information of the sampling point of the palm relative to the reference plane for identification. Since the palm may rotate and translate in the three-dimensional coordinates of the sampling system, it is necessary to locate the coordinates of the palm. The amount of 3D point cloud data is huge, many p...
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IPC IPC(8): G06K9/00G06K9/46
Inventor 张大鹏骆南李伟
Owner HARBIN INST OF TECH