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Vertical calibrating method for CCD imaging optic axle and grading screen based on symmetric measurement

A calibration method and screen technology, applied in the field of vertical calibration, can solve the problems of collimation axis error, artificial reading error, cumbersome positioning, etc., and achieve the effect of small reading error and simple collimation positioning method

Inactive Publication Date: 2007-10-10
TIANJIN INTERNAL COMBUSTION ENGINE RES INST
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Problems solved by technology

This collimation positioning method has the following disadvantages: 1. The positioning is cumbersome, and successful collimation positioning is based on a large amount of repetitive adjustment work; 2. There is an error in the collimation axis; 3. There is an artificial reading error

Method used

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  • Vertical calibrating method for CCD imaging optic axle and grading screen based on symmetric measurement
  • Vertical calibrating method for CCD imaging optic axle and grading screen based on symmetric measurement
  • Vertical calibrating method for CCD imaging optic axle and grading screen based on symmetric measurement

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Embodiment Construction

[0034] 1. Calibration principle:

[0035] The calibration work in this paper is the prerequisite for the imaging test of the light distribution performance of motorcycle headlights. The test principle is shown in Figure 1. In order to make the imaging optical axis of the camera perpendicular to the test screen, that is, the imaging optical axis of the CCD camera in Figure 1 should be perpendicular to the test screen at point o. In this experiment, the symmetrical measurement method is adopted, and the CCD camera is used to image the circular target on the light distribution test screen. The test principle is shown in Figure 2:

[0036] In Figure 2, the plane of the ring target is placed parallel to and below the vertical line of the light distribution screen, and the vertical line of the screen coincides with the vertical line passing through the center of the ring. The CCD camera is placed in front of the ring target at the same height, and the center of the CCD lens is appr...

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Abstract

A vertical calibrating method of CCD imaging optical axis to light grading screen based on symmetric measurement include setting formed circular target plane to be under midperpendicular of screen in parallel mode, arranging CCD video camera in front of circular target center by equal height way for carrying out imaging on light form on grading screen and for carrying out measurement on illumination of light form, coinciding stripe center line with midperpendicular of grading screen and further regulating CCD video camera to be on certain position.

Description

technical field [0001] The invention relates to a vertical calibration method, in particular to a vertical calibration method of a CCD imaging optical axis and a light distribution screen based on symmetrical measurement. Background technique [0002] The principle formula for measuring the light distribution performance of vehicle headlights by using the area array CCD camera imaging method is usually expressed as follows: [0003] E ′ = ρ · τ · E 4 F 2 cos 4 ω Formula 1) [0004] Among them, E is the illuminance at the test point on the light distribution test screen, E' is the illuminance at the corresponding imaging point of the test point on the CCD image plane, F is the aperture number of the camera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M11/06G01C11/00
Inventor 李钢纪迎平刘铁根贺文杰李志锐王青隋修武方素香宋涛陈鲤江
Owner TIANJIN INTERNAL COMBUSTION ENGINE RES INST
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