A 3D Face Calibration Method Resisting Pose and Expression Variations
A technology of three-dimensional face and calibration method, which is applied in the field of face calibration against attitude changes, can solve the problems of the impact of three-dimensional face data loss, etc., and achieve the effect of simple calibration method, good convergence, and improved accuracy
Active Publication Date: 2017-11-24
ZHEJIANG UNIV
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However, many methods are based on 3D surface curvature or 2D contours. These features are susceptible to the loss of 3D face data, so face calibration is still a problem, and there is still no good robust method to solve the above problems.
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[0048] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0049] like figure 1 Shown, a kind of three-dimensional human face calibration method of the present invention can resist posture and expression variation, comprises the following steps:
[0050] (1) The stage of constructing the active appearance model, which specifically includes the following sub-steps:
[0051] (1.1) Acquisition and training faces: Use the second-generation high-quality 3D digitizer based on structured light to obtain faces with neutral postures (that is, without any posture changes), as a face training library, and manually locate important marker points (including eyes) , nose, mouth corners, etc.), a total of 22, such as figure 2 , where (a) is a schematic diagram of two-dimensional marker points, and (b) is a schematic diagram of corresponding three-dimensional marker points; the outer contour points of the...
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The invention discloses a three-dimensional face calibrating method capable of resisting posture and facial expression changes. The three-dimensional face calibrating method comprises an active appearance model establishing stage and a face calibrating stage. In the active appearance model establishing stage, a three-dimensional face is acquired through three-dimensional image acquisition equipment, important markers of the face are manually marked, and through the grid shape and appearance information of the face, an active appearance model based on a depth image is established; in the face calibrating stage, the face is roughly calibrated through an average nose model first and then a test face is matched with the active appearance model based on the depth image to finely calibrate the face. By the method from rough calibration to fine calibration, the posture and facial expression changes of the face can be resisted, so that the face can be accurately calibrated under a natural condition; through conversion of the three-dimensional face onto the depth image, the calibrating efficiency is improved; therefore, the three-dimensional face calibrating method has an important significance in promoting practical application of the three-dimensional face to identity authentication.
Description
technical field [0001] The invention relates to the technical fields of image processing and pattern recognition, in particular to a face calibration method against posture changes in a three-dimensional face recognition direction. Background technique [0002] In today's information age, the effective identification and authentication of personal identity is a very important issue in security systems, such as airport security checks and access control supervision. Traditional identity verification methods have disadvantages such as inconvenient use and low security. As a new type of identity recognition method, biometric recognition provides a solution to the above problems because of its advantages such as security, ease of maintenance, and universality. . [0003] Biometric identification technology refers to the technology that uses the inherent physiological information and behavior of the human body as a feature to identify and verify the identity through intelligent ...
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IPC IPC(8): G06K9/00G06T15/00
Inventor 胡浩基刘蓉
Owner ZHEJIANG UNIV