Optical axis detection and calibration method for super wide-angle lens

Abstract

The invention discloses a detection and calibration method for optical axis of an ultra-wide-angle lens. The method includes steps: (1) acquiring a standard image obtained by imaging of an image card through the ultra-wide-angle lens in an ideal state; (2) adopting a clamp for clamping the ultra-wide-angle lens to be calibrated, and adjusting a distance between the clamp and the image card to be d; (3) calculating an included angle beta between each elliptical image and a concentric circle image, corresponding to the elliptical image, in the standard image according to distances of concentric circle original images on the image card and distances of concentric circle images in the standard image; (4) rotating an imaging plane of the ultra-wide-angle lens by an inclination angle beta in a direction opposite to the inclination direction to obtain an inclination correction imaging plane of the ultra-wide-angle lens. The detection calibration method for the optical axis of the ultra-wide-angle lens has advantages that by adoption of the concentric circle image card for lens test, influence caused by high distortion of the ultra-wide-angle lens is avoided, and the inclination angle of the ultra-wide-angle lens can be detected accurately and corrected correspondingly.

Description

technical field [0001] The invention relates to an optical axis calibration method, in particular to an optical axis detection and calibration method based on a super wide-angle lens. Background technique [0002] In electronic products equipped with two or more cameras at the same time, it is generally necessary to calibrate the optical axes assembled by multiple lenses. At present, the common lens calibration method commonly used is as follows: figure 1 In the black-and-white checkerboard chart method shown, the position of each intersection point is identified and compared by software to achieve the purpose of optical axis calibration. The advantage of this method is that it is easy to implement and has high calibration accuracy, but it cannot test the optical axis of a lens with large distortion. Axis shift, due to wide-angle lenses with large distortion, such as figure 2 As shown, the position of the intersection of the checkerboard will change due to the distortion c...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the optical axis calibration of the existing ultra-wide-angle lens cannot distinguish the image distortion caused by the lens itself or the image distortion caused by the optical axis offset, resulting in low accuracy of the optical axis calibration, a super wide-angle lens is proposed. The optical axis detection and calibration method of wide-angle lens can solve the above problems

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