Lens ghosting phenomenon detection method and device

Abstract

The invention discloses a lens ghosting phenomenon detection method and device, and the method comprises the steps: controlling a mobile module to carry a to-be-detected product to move, and enabling the optical axis of the to-be-detected product to shift relative to the optical axis of a camera module; controlling the camera module to expose a detection graphic card which is displayed by a display screen in the to-be-detected product and composed of a black background and a white circular ring, and obtaining a test image; and judging whether a ghosting phenomenon exists or not according to the pixel gray value of the test image. According to the method and system, a machine vision mode is adopted to carry out automatic detection of lens ghosting, the ghosting phenomenon can be accurately detected through a simple annular detection graph card and an optical axis offset mode, the risk of over-detection of normal products can be reduced, the problems of instability of manual detection and possible missing detection are solved, and the problem of over-detection caused by glare easily generated by complex patterns is solved.

Description

technical field [0001] The invention relates to the technical field of optical detection, in particular to a method and a device for detecting lens ghosting phenomenon. Background technique [0002] The ghost phenomenon is mainly caused by multiple reflections of light reflected on the surface of the lens in the optical system, or due to problems in the lens packing process, especially when the screen brightness is high. The important structure of virtual reality technology (Virtual Reality, VR) products is the lens. The screen is imaged to the human eye through the transparent window (Cover Window, CW) and the lens. However, multiple reflections occur during this process to form ghost images. [0003] At present, the detection method of the ghost phenomenon of VR products is generally to detect the long-exposure time through the circular image card with star rays. There is a risk of over-examination. In addition, manual detection standards are not uniform, and there is a ...

AI Technical Summary

Problems solved by technology

[0003] At present, the detection method of the ghost phenomenon of VR products is generally to detect the long-exposure time through the circular image card with star rays. risk of over-inspection

In addition, manual detection standards are not uniform, and there is a risk of missed detection; the brightness value of the detection chart is very large, which has a great impact on the visual perception of the human eye. This is a technical problem that technicians in the field need to solve

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