A Calibration Method for Geometric Parameters of Light Field Camera Microlens Array

Abstract

The invention discloses an optical field camera micro-lens array geometric parameter calibration method comprising the following steps that step one: an even light guide plate is installed at the front end of an optical field camera lens to photograph a white light source so as to obtain the white image of an optical field camera; step two: demosaicing is performed on the white image of the optical field camera and the white image is converted into a true color image; step three: the edge contours of all the micro-lenses in the true color image are extracted, and the coordinates of the edge points are saved; and step four: the coordinates Ci (x, y) of the center of the circle of all the micro-lens images and the corresponding radius Ri are obtained according to the coordinates of the edge points, and statistics of the number N of the micro-lenses is performed. The method is high in degree of automation, and the original image is directly operated without a preset template so that the accurate micro-lens array data can be provided for the internal and external parameter calibration of the optical field camera and a camera optical model, and different types of micro-lens images can be provided for subsequent image processing.

Description

technical field [0001] The invention relates to a calibration method of camera geometric parameters, which belongs to the field of digital image processing. Background technique [0002] The light field camera is different from the traditional camera. It is a microlens array placed between the main lens and the image sensor. The sensor can record the intensity information and direction information of the light at the same time to realize the collection of four-dimensional light field data. The light field camera has the characteristics of first taking pictures and then focusing, which can effectively capture a wider range of scene depth and display the 3D structure of the real scene. Light field imaging technology is gradually used in aerospace, 3D reconstruction, security surveillance and many other fields. [0003] In order to obtain the 3D information of the real scene and realize accurate tracing of rays, the internal and external parameters of the camera must be calibra...

AI Technical Summary

Problems solved by technology

The pre-set templates of this method are all fixed parameters. If it is used for microlens arrays of other specifications, the error will be greatly increased.

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