A method for automatically measuring flat display optical performance

Abstract

The application discloses a kind of flat display optical performance automatic measurement method, first constructs flat display optical performance automatic measurement device, including control machine, five-axis precision adjustment table, flat display, collimator and CCD camera;Control machine is installed test software, and is electrically connected with five-axis precision adjustment table and CCD camera;Flat display is placed between five-axis precision adjustment table and collimator;Five-axis precision adjustment table is under the automatic control of test software to make the picture center of CCD camera and flat display and collimator optical axis automatic alignment;While adjusting CCD camera to the eyebox position of flat display carries out test;Test software will virtual scale plate image superimposed on flat display character image;Finally by test software, the azimuth between two cursors manually set on virtual scale plate image and flat display character image is automatically outputted calculation pitch, elevation deviation.The application can complete optical axis automatic alignment, character display precision, parallax and other test data automatic calculation, with the advantages of simple operation, high degree of automation.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of optical performance test, and particularly relates to a kind of flat display optical performance automatic measurement method. BACKGROUND

[0002] The test of flat display optical performance generally adopts the way of theodolite, but the field of view of theodolite telescope is small, which leads to a time-consuming process of finding the flat display character outside the field of view in the telescope eyepiece;The light axis needs to be aligned manually;The test data needs to be calculated manually;The theodolite cannot record the target picture in the test process, which is not conducive to the preservation and review of test data. Since the flat display character and the parallel light tube scale board image are not all displayed at the theoretical infinity, it is difficult to make both clear images at the same time when the camera is shooting, so in the scheme of replacing the theodolite with other cameras, only the flat display optical performance that does not depend on the parallel light tube can be tested, which has certain limitations. SUMMARY

[0003] In order to overcome the shortcomings of the prior art, the present application provides a kind of flat display optical performance automatic measurement method, first constructs flat display optical performance automatic measurement device, including control machine, five-axis precision adjustment table, flat display, parallel light tube and CCD camera;The test software is installed on the control machine, and the five-axis precision adjustment table and the CCD camera are electrically connected;The flat display is placed between the five-axis precision adjustment table and the parallel light tube;The five-axis precision adjustment table automatically aligns the center of the CCD camera picture with the light axis of the flat display and the parallel light tube under the automatic control of the test software;At the same time, the CCD camera is adjusted to the eyebox position of the flat display for testing;The test software superimposes the virtual scale board image on the flat display character image;Finally, the test software automatically outputs the azimuth and pitch deviation between the two cursors manually set on the virtual scale board image and the flat display character image. The present application can automatically align the light axis, automatically calculate the character display precision, parallax and other test data, and has the advantages of simple operation and high automation degree.

[0004] The technical solution adopted by the present application to solve its technical problems includes the following steps:

[0005] Step 1: Construct a flat display optical performance automatic measurement device, including a control machine, a five-axis precision adjustment table, a flat display, a parallel light tube and a CCD camera;The test software is installed on the control machine, and the five-axis precision adjustment table and the CCD camera are electrically connected;The CCD camera is fixedly installed on the five-axis precision adjustment table;

[0006] The flat display is installed on an adjustable mounting bracket and placed between the five-axis precision adjustment table and the parallel light tube;

[0007] Step 2: The X-axis adjusting mechanism, the Y-axis adjusting mechanism, the Z-axis adjusting mechanism, the pitch adjusting mechanism and the azimuth adjusting mechanism of the five-axis precision adjusting table are automatically controlled by the test software to adjust the CCD camera to the eyebox position of the flat display for testing;

[0008] Step 3: The X-axis adjusting mechanism, the Y-axis adjusting mechanism, the Z-axis adjusting mechanism, the pitch adjusting mechanism and the azimuth adjusting mechanism of the five-axis precision adjusting table are automatically controlled by the test software to automatically align the center of the CCD camera picture with the optical axis of the flat display and the collimator;

[0009] Step 4: The test software automatically generates a virtual scale plate image according to the scale plate image of the collimator captured by the CCD camera; the scale plate image includes a scale plate image grid and a scale plate image scale, and can perform data calculation and testing of characters at any position;

[0010] Step 5: The test software superimposes the automatically generated virtual scale plate image on the flat display character image captured by the CCD camera;

[0011] Step 6: The test software gradually increases or decreases the grid density of the virtual scale plate image according to the magnification of the superimposed image;

[0012] Step 7: During the magnification adjustment process of the superimposed image, the size of the scale plate image scale and the line width of the virtual scale plate image grid are kept within a set range;

[0013] Step 8: Manually set a cursor 11 at the same position on the virtual scale plate image and the flat display character image;

[0014] Step 9: The test software automatically outputs the azimuth and pitch data of the two cursors in step 8;

[0015] Step 10: The test software automatically calculates the azimuth and pitch deviation between the two cursors to complete the automatic measurement of the optical performance of the flat display.

[0016] The beneficial effects of the present application are as follows:

[0017] The present application can complete automatic calculation of test data such as optical axis automatic alignment, character display precision and parallax, and has the advantages of simple operation and high automation degree. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The present application is a flat display optical performance test configuration diagram.

[0019] Figure 2 The present application is a front view and side view of a five-axis precision adjusting table, (a) front view, (b) left view.

[0020] Figure 3The virtual graticule image of the application is superimposed on the character image of the flat field display.

[0021] In the figure, 1-control machine, 2-five-axis precision adjustment table, 3-flat field display, 4-parallel light tube, 5-CCD camera, 11-cursor, 21-X-axis adjustment mechanism, 22-Y-axis adjustment mechanism, 23-Z-axis adjustment mechanism, 24-elevation adjustment mechanism, 25-azimuth adjustment mechanism, 31-flat field display character image, 41-graticule image grid, 42-graticule image scale. DETAILED DESCRIPTION

[0022] The application is further described below in combination with the drawings and examples.

[0023] In order to solve the shortcomings of the traditional theodolite in the flat field optical performance test, an automatic testing device based on image recognition in the flat field optical performance test is proposed, which can complete the automatic alignment of the optical axis, the automatic calculation of the test data and the recording of the test picture, and has the advantages of simple operation and high automation degree.

[0024] A flat field optical performance automatic measurement method, comprising the following steps:

[0025] Step 1: Constructing a flat field optical performance automatic measurement device, including a control machine 1, a five-axis precision adjustment table 2, a flat field display 3, a parallel light tube 4 and a CCD camera 5; the control machine 1 is installed with a test software, and the control machine 1 is electrically connected with the five-axis precision adjustment table 2 and the CCD camera 5; the CCD camera 5 is fixedly installed on the five-axis precision adjustment table 2;

[0026] The flat field display 3 is installed on an adjustable mounting bracket and is placed between the five-axis precision adjustment table 2 and the parallel light tube 4;

[0027] Step 2: The X-axis adjustment mechanism 21, the Y-axis adjustment mechanism 22, the Z-axis adjustment mechanism 23, the elevation adjustment mechanism 24 and the azimuth adjustment mechanism 25 of the five-axis precision adjustment table 2 are automatically controlled by the test software to adjust the CCD camera 5 to the eyebox position of the flat field display 3 for testing;

[0028] Step 3: The X-axis adjustment mechanism 21, the Y-axis adjustment mechanism 22, the Z-axis adjustment mechanism 23, the elevation adjustment mechanism 24 and the azimuth adjustment mechanism 25 of the five-axis precision adjustment table 2 are automatically controlled by the test software to automatically align the center of the picture of the CCD camera 5 with the optical axes of the flat field display 3 and the parallel light tube 4;

[0029] Step 4: The test software automatically generates a virtual graticule image according to the graticule image of the parallel light tube taken by the CCD camera 5; the graticule image includes a graticule image grid 41 and a graticule image scale 42, and can calculate and test data of characters at any position;

[0030] Step 5: The test software superimposes the automatically generated virtual reticle image onto the flat-field character image 31 taken by the CCD camera 5;

[0031] Step 6: The test software increases or decreases the grid density of the virtual reticle image step by step according to the magnification of the superimposed image;

[0032] Step 7: During the magnification adjustment of the superimposed image, the scale size of the virtual reticle image and the line width of the virtual reticle image grid are kept within a set range;

[0033] Step 8: Manually set a cursor 11 at the same position on the virtual reticle image and the flat-field character image respectively;

[0034] Step 9: The test software automatically outputs the azimuth and elevation data of the two cursors in step 8;

[0035] Step 10: The test software automatically calculates the azimuth and elevation deviation between the two cursors, and completes the automatic measurement of the flat-field optical performance.

Claims

1. An automatic measurement method for the optical performance of a head-up display (HUD), characterized in that, Includes the following steps: Step 1: Construct an automatic measurement device for the optical performance of a head-up display (HUD), including a control unit, a five-axis precision adjustment stage, a HUD, a collimator, and a CCD camera; the control unit is equipped with testing software and is electrically connected to the five-axis precision adjustment stage and the CCD camera; the CCD camera is fixedly mounted on the five-axis precision adjustment stage. The head-up display is mounted on an adjustable mounting bracket and placed between a five-axis precision adjustment stage and a collimator. Step 2: Under the automatic control of the testing software, the X-axis adjustment mechanism, Y-axis adjustment mechanism, Z-axis adjustment mechanism, pitch adjustment mechanism, and azimuth adjustment mechanism of the five-axis precision adjustment stage adjust the CCD camera to the eye box position of the head-up display for testing; Step 3: Under the automatic control of the test software, the X-axis adjustment mechanism, Y-axis adjustment mechanism, Z-axis adjustment mechanism, pitch adjustment mechanism, and azimuth adjustment mechanism of the five-axis precision adjustment stage automatically align the center of the CCD camera image with the optical axis of the head-up display and the collimator. Step 4: The testing software automatically generates a virtual reticle image based on the collimator reticle image captured by the CCD camera; the reticle image includes the reticle image grid and the reticle image scale, and can perform data calculation and testing of characters at any position; Step 5: The testing software overlays the automatically generated virtual reticle image onto the head-up display character image captured by the CCD camera; Step 6: The testing software gradually increases or decreases the grid density of the virtual reticle image based on the magnification of the superimposed image; Step 7: During the process of adjusting the magnification of the superimposed image, the test software ensures that the size of the virtual reticle image scale and the line width of the virtual reticle image grid remain within the set range; Step 8: Manually set a cursor (11) at the same position on the virtual reticle image and the flat character image respectively; Step 9: The test software automatically outputs the azimuth and elevation data of the two cursors from Step 8; Step 10: The testing software automatically calculates the azimuth and pitch deviations between the two cursors, completing the automatic measurement of the head-up display's optical performance.

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