Device and method for measuring and correcting distortion of virtual reality displayer

Abstract

The invention discloses a method for measuring and correcting distortion of a virtual reality displayer. The method includes the following steps that reticle imaging is carried out through an optical system to obtain a distortion grid image; a distortion coefficient of each grid is obtained through calculation according to the corresponding relationship between a vertex coordinate of the corresponding grid and a vertex coordinate of each distortion grid; non-distortion grids A are marked out on the distortion grid image, according to an optical path reversible principle, an object face of the optical system has distortion grids A' corresponding to the grids A, then vertex coordinates of the distortion grids A' are calculated by means of the distortion coefficients and the vertex coordinates of the grids A, and a coordinate look-up table is generated by means of the vertex coordinates of the distortion grids A'; an image to be projected is converted into a pre-distortion image by means of the coordinate look-up table, an image source is input, a pre-distortion image displayed by the image source is imaged, an imaging image is obtained, the imaging image is compared with the pre-distortion image, the image source is adjusted, and correcting of the image source is completed. The invention further discloses a device for measuring and correcting distortion of the virtual reality displayer.

Description

technical field [0001] The invention relates to the field of projection optical systems, in particular to a device and method for measuring and correcting distortion of a virtual display display. Background technique [0002] A virtual reality display is different from a general projector. It is a device that can directly project information such as text and images from an optical system to the human eye for imaging. The projected text and images are adjusted on an infinite plane, such as a head-up display (HUD) And the helmet-mounted display (HMD), which can integrate the external scene with the data of the display, so that people can conveniently and comfortably see the important information he needs without looking down. [0003] Virtual reality displays were originally used in military aircraft, and now they involve a wide range of applications. Virtual reality displays (HWD) with intelligent operating systems have begun to be commercialized, such as Google glasses; many...

AI Technical Summary

Problems solved by technology

[0004] However, in order to keep the displayed information from being lost and at the same time give the observer a comfortable look and feel, the optical system of the virtual reality display must meet the requirements of high definition and large field of view, which will cause distortion of the projected image , the higher the definition, the larger the field of view, and the greater the distortion of the image, especially in the peripheral field of view

The general optical system often adopts a coaxial design. At this time, the distortion of the image is symmetrical about the center. However, in some special assembly environments, the optical system of the virtual reality display must adopt an off-axis design, which will make the projected image Very large distortion occurs, and the distortion is asymmetric

The distortion of the projected image will not only affect the comfort of observation, but even cause the observer to misjudge important information, resulting in unnecessary loss

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