Photogrammetric Method of Liquid Crystal Display and Its Application

A technology of liquid crystal display and photogrammetry, which is applied in photogrammetry/video surveying, measuring devices, instruments, etc., can solve the problems of inability to achieve, the resolution does not meet the requirements, and the field of view of the camera is limited, so as to improve the measurement accuracy. , the effect of low cost

Inactive Publication Date: 2017-08-11
青岛政信通信息科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited field of view of a camera, it is necessary to take a long-distance shot in order to completely include the entire LCD display in the shooting range, so that the shooting clarity cannot meet the requirements
However, to combine several images, you need to know the absolute position of each point, which cannot be achieved

Method used

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  • Photogrammetric Method of Liquid Crystal Display and Its Application
  • Photogrammetric Method of Liquid Crystal Display and Its Application
  • Photogrammetric Method of Liquid Crystal Display and Its Application

Examples

Experimental program
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Embodiment 1

[0031] The invention discloses a photogrammetry method of a liquid crystal display, which is used for measuring the two-dimensional spatial coordinates of a point to be measured on a liquid crystal display. The point to be measured is located in the camera field of view 1 of an industrial camera. In this embodiment, the point to be measured is a camera The center point of the field of view.

[0032] Wherein the liquid crystal display adopts the liquid crystal display commonly used now. The new oled display is under development, and the price / performance ratio is not very good, but it is still usable. LCD screens of various sizes, such as mobile phone LCD screens, are also available. Industrial cameras are also commonly used. With a suitable lens, objects can be viewed at a microscopic level in a suitable field of view (similar to the working situation of a tool microscope). Cameras of various sizes, such as tiny cameras from the mobile phone industry, are also available. Th...

Embodiment 2

[0048] The difference with Embodiment 1 is that this embodiment discloses another solution of the method for measuring angular displacement, and the industrial camera 7 is fixed on the device under test 5, such as Figure 4 shown. The method described in this scheme includes: the industrial camera 7 is fixed on the rotating end 6 of the device under test 5 and rotates together with the rotating end 6, and the photogrammetry method is used to at least measure the coordinates of the center point 3 of the camera field of view at the initial position, and finally The coordinates of the center point 3 of the camera field of view at the position, and the coordinates of any center point 3 of the camera field of view between the initial position and the final position, calculate the angular displacement; wherein the rotation center of the industrial camera 7 relative to the rotating end 6 The axis 8 is arranged eccentrically, and the liquid crystal display 4 is installed on the positi...

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Abstract

The invention discloses a photogrammetry method of a liquid crystal display, which is used for measuring the two-dimensional space coordinates of points to be measured on the liquid crystal display, and the points to be measured can be obtained through the steps of displaying code patterns, rough positioning steps and precise positioning steps respectively position across the LCD screen. Using industrial cameras and liquid crystal displays combined with this photogrammetry method, at least the coordinates of the center point of the camera's field of view at the initial position, the coordinates of the center point of the camera's field of view at the final position, and any camera field of view between the initial position and the final position are measured. The coordinates of the center point of the field to calculate the angular displacement. Using this method of measuring angular displacement not only has low cost, but also has advantages in installation. At the same time, it is a non-contact measurement, which can eliminate the loss of measurement accuracy caused by the coupling and effectively improve the measurement accuracy.

Description

technical field [0001] The invention relates to the technical field of photogrammetry, in particular to a photogrammetry method of a liquid crystal display, and also to a method for measuring angular displacement by using the photogrammetry method. Background technique [0002] With the increase of measurement requirements and the development of photoelectric technology, photogrammetry technology has developed rapidly. In the existing technology, the measurement of the two-dimensional space coordinate system is quite mature. After the camera captures the image of the object to be measured, the measurement process is performed. The measurement process is divided into the processing and analysis of the image of the object to be measured and the geometry of the object to be measured. The measurement of the geometric quantity of the object to be measured also includes image preprocessing and edge extraction algorithms. After the above processing, the measured edge of the object ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/00G01B11/26G01C11/00
Inventor 于天舒
Owner 青岛政信通信息科技有限公司
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