Method and communication terminal for obtaining three-dimensional deformation basis
A three-dimensional deformation, deformation-based technology, applied in the field of video transmission, can solve the problem of inaccurate faces, and achieve the effect of stable three-dimensional face reconstruction
Active Publication Date: 2015-09-30
HUAWEI TECH CO LTD
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[0005] The embodiment of the present invention relates to a method for obtaining a three-dimensional deformation base and a communication terminal, so as to solve the ambiguity of the three-dimensional deformation base in the prior art, so that the final obtained face is inaccurate
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[0038] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.
[0039] figure 1 It is a flowchart of a method for obtaining a three-dimensional deformation base according to an embodiment of the present invention. As shown in the figure, the method for obtaining a three-dimensional deformation base according to an embodiment of the present invention is mainly for a communication terminal with a sending function in a communication network such as a wireless network. This embodiment includes the following steps:
[0040] Step 11, calculate the two-dimensional tracking matrix W to obtain the sub-matrix with the smallest condition number;
[0041] The condition number is the ratio of the maximum eigenvalue λmax(a) and the minimum eigenvalue λmin(a) of the sub-matrix; the frame number of the video image corresponding to the sub-matrix is the second quantity K; the sub-matrix The mat...
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The invention relates to a method for acquiring a three-dimensional deformation base and a communication terminal. The method includes calculating by a two-dimensional traceability matrix to obtain a submatrix with a smallest condition number, wherein a frame number of a video image corresponding to the submatrix is a second quantity K; calculating by a corresponding line in the two-dimensional traceability matrix W included in the submatrix by utilizing the two-dimensional traceability matrix W and the corresponding line in the same included in the submatrix to obtain a shape base constraint condition and a three-dimensional shape base matrix; and calculating the second quantity, the three-dimensional shape base matrix, the shape base constraint condition and an orthogonal rotation constraint condition to obtain a three-dimensional deformation base. A K-frame video image highly independent is selected to serve as a basis of acquiring the shape base constraint condition, the shape base constraint condition is added to calculate to obtain the three-dimensional deformation base, and accordingly the three-dimensional deformation base obtained by calculation is prevented from ambiguity and more stable three-dimensional face reconstruction can be obtained by a receiving end.
Description
technical field [0001] The invention relates to the field of video transmission, in particular to a method for acquiring a three-dimensional deformation base and a communication terminal. Background technique [0002] With the increasing development of network technology, a large number of interactive video communication applications have emerged. Faces and facial expressions contain rich information in video communication, and the transmission of facial images has become increasingly important. The prior art provides a three-dimensional modeling technology to model and transmit facial images. [0003] An existing 3D model method for face video transmission is based on the active shape model ASM and the motion recovery structure SFM modeling method. This prior art uses the ASM matching algorithm to track the face feature points, and uses the SFM method to obtain the 3D deformation base, and estimate the parameters of the 3D deformation base, so as to finally get the final ...
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IPC IPC(8): H04N7/14G06K9/00
Inventor 王耕
Owner HUAWEI TECH CO LTD