Light field camera calibration method based on multi-center projection model

Abstract

The invention provides a light field camera calibration method based on a multi-center projection model. The method comprises the steps of shooting the calibration plates under different postures by moving a calibration plate or a light field camera; obtaining the light field data, determining the corner points on the calibration plates and a matched corner point light set; constructing a linear constraint of the light rays of a light field coordinate system of the light field camera and the three-dimensional space points, calculating the internal parameters of the light field camera and the external parameters under the corresponding attitudes through the linear initialization, establishing a cost function based on a reprojection error, and performing iteration to obtain an optimal solution of the internal parameters, the external parameters and the radial distortion parameters of the light field camera to be calibrated. According to the method, the light rays in space are recorded bythe light field camera essentially, due to the fact that the light rays are parameterized by adopting double parallel planes and absolute coordinates, the problem that three-dimensional point reconstruction is inaccurate is solved, and the purpose of accurately and robustly calibrating the internal parameters of the light field camera is achieved.

Description

technical field [0001] The invention belongs to a calibration method for a light field camera, relates to the fields of computer vision, computational photography and optical engineering, in particular to a calibration method for a light field camera. Background technique [0002] The rise of light field imaging theory is an important innovation in the field of computer photography, which breaks through the limitations of traditional imaging techniques. Light field cameras reduce the loss of shooting information by recording the position and angle information of light in space, and achieve novel imaging effects such as variable viewpoint, digital refocusing, extended and adjustable depth of field. However, the accuracy of camera parameter calibration restricts the development of light field camera performance to some extent. Accurate calibration results are of great significance to the correction of light field image distortion and the improvement of imaging quality, and th...

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Problems solved by technology

However, the low resolution of the microlens image limits the accuracy of the line features, thereby affecting the calibration accuracy

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