Perspective transformation method and device, electronic equipment and readable storage medium

Abstract

The invention provides a perspective transformation method and device, electronic equipment and a readable storage medium, and aims at a face image collected by shooting equipment, a face region image in the face image is obtained through interception, and the face region image comprises a plurality of face key points. And constructing a virtual perspective camera, and obtaining a pose parameter of the virtual perspective camera according to a re-projection error between 3D coordinate information and 2D coordinate information of each face key point in the face region image and rigid transformation information of the face during perspective transformation. And finally, converting the 3D coordinate information of each face key point into virtual 3D coordinate information in a virtual perspective camera space based on the pose parameters. In the scheme, the re-projection error and rigid transformation information between the 3D point and the 2D point are comprehensively considered in perspective transformation, and good effects can be achieved on avoiding face transformation deformation and improving key point projection accuracy.

Description

technical field [0001] The present application relates to the technical field of image processing, and in particular, to a perspective transformation method, apparatus, electronic device, and readable storage medium. Background technique [0002] In recent years, face 3D keypoint detection has been widely used in the fields of face tracking, emotion recognition, and face VR special effects. In the field of face 3D key point detection, it usually involves cropping and other processing of the collected original image, resulting in changes in the internal and external parameters of the camera. Therefore, in order to accurately restore the position information of key points in the processed image, a virtual camera is generally constructed and the three-dimensional face information in the original world coordinate system is perspective-transformed into the virtual perspective camera space. [0003] However, in the prior art, when performing perspective transformation, a fitting ...

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Problems solved by technology

[0003] However, when performing perspective transformation in the prior art, fitting methods such as the least squares method are generally used for fitting transformation. This method is prone to problems such as inaccurate calculation and distortion of human faces.

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