Patent ID: 11922707
Assignee: BIGO TECHNOLOGY PTE. LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 4:
5. The method according to claim 1, wherein performing three-dimensional reconstruction on each training face image by using the principal component matrix and the eigenvalue matrix, and acquiring the training three-dimensional face model comprises:
setting an initial eigenvalue matrix and an initial projection parameter matrix;
constructing an initial three-dimensional face model by using the initial eigenvalue matrix and the principal component matrix;
acquiring a projected face image of the initial three-dimensional face model in a two-dimensional space based on the initial projection parameter matrix;
calculating a difference value between the projected face image and the training face image;
iteratively optimizing the initial eigenvalue matrix and the initial projection parameter matrix by using a stochastic gradient descent method based on the difference value, acquiring the eigenvalue matrix and the projection parameter matrix, when the difference value converges and taking the eigenvalue matrix and the projection parameter matrix as a target eigenvalue matrix and a target projection parameter matrix; and
generating the training three-dimensional face model by using the target eigenvalue matrix and the principal component matrix.