Light field camera internal parameter calibration device and method

Abstract

The invention provides a light field camera internal parameter calibration device and method, and the method comprises the steps: fixing a light field camera on an electric control translation platform, controlling the electric control translation platform through a motion controller, and driving the light field camera to translate to different positions; the calibration plate is arranged in frontof a main lens of the light field camera and is fixed on the angle rotating table, and the motion controller controls the angle rotating table to drive the calibration plate to rotate at different angles; the calibration plates under different postures are shot by rotating the calibration plates or moving the light field camera, the points on the calibration plates and the image points corresponding to the points are determined, the internal parameters and the external parameters under the corresponding postures of the light field camera are calculated through linear initialization, finally acost function is established, and an optimal solution is obtained through iteration. According to the invention, the internal parameters of the light field camera can be calibrated more flexibly andaccurately.

Description

Technical field [0001] The invention relates to the fields of computer vision, computer photography and optical engineering, in particular to a calibration model and method for internal parameters of a light field camera based on a calibration plate. Background technique [0002] The rise of the theory of light field imaging is an important innovation in the field of computer photography, which breaks through the limitations of traditional imaging technology. The light field camera reduces the loss of shooting information by recording the position and angle information of the light in the space, and can perform post-processing according to requirements to obtain focused images at any depth. However, the accuracy of camera parameter calibration restricts the development of light field camera performance to a certain extent. Accurate calibration results are of great significance to the improvement of the resolution of refocused images and the improvement of image quality in the la...

AI Technical Summary

Problems solved by technology

However, this method is not suitable for the case where the geometric center of the microlens does not coincide with the optical center

In the same year, Dansereau et al. established a method for decoding the pixels of the light field camera into a light model and a projection transformation matrix with 12 parameters, but this method uses the traditional camera internal parameter calibration to initialize the internal parameters of the light field camera. , and there is a problem of redundant decoding matrix parameters

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