Dimension measuring system for large-format plate materials and measuring method thereof

Abstract

The invention discloses a dimension measuring system for large-format plate materials, which mainly comprises a stereo bracket, a traction moving device, a sample scanning system, a calibration systemand a main control system. The traction moving device is installed on the stereo bracket, and moves the sample scanning system by traction. The calibration system is used as a calibration object of the large-format dimension measuring system, is composed of two groups of checkerboard calibration rulers, and is located around the bottom of the stereo bracket. The main control system receives a signal from the sample scanning system, analyzes and identifies the characteristic information in an image, calculates the sample dimensions according to the proportion relationship between the image pixels and the actual dimensions and outputs the sample dimensions. A dimension measuring method for large-format plate materials is also disclosed. Measurement and calibration are carried out simultaneously, and the problem of image error caused by the angle error of installation of multiple linear array cameras, camera motion error and image crossing and overlapping can be solved. The system and the method have the advantages of high measurement accuracy and wide application scope.

Description

technical field [0001] The invention relates to the field of dimension measurement of large panel materials in industrial production, in particular to a dimension measurement system and a measurement method for large panel materials. Background technique [0002] At present, the size measurement of large panel materials in industrial production still adopts the traditional manual measurement method, and the enterprise employs a large number of workers to use tools such as calipers to measure the size of panel materials. This measurement method leads to excessive daily workload for workers, and may even cause a series of problems, such as reading errors, irregular measurements, and material damage, which in turn affects measurement accuracy and product quality. [0003] In the industry, there are also some enterprises that use mechanical measurement to assist in measuring size through camera photography. This method has the following technical problems: [0004] (1) Due to t...

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Problems solved by technology

[0004] (1) Due to the large size of the plate material, the field of view of a single camera is not enough, and multiple cameras are required to scan at the same time to cover the object to be measured;

[0005] (2) When multiple cameras are installed on the camera measurement platform, due to the installation process, there is a certain angle deviation between multiple cameras, resulting in multiple cameras not being on a straight line, resulting in a certain angle error in the captured image;

[0006] (3) When the camera measurement platform moves to scan the object to be measured, the speed of movement is not completely uniform due to motor and mechanical errors, which will also cause deformation of the captured image;

[0007] (4) During the use of the camera measurement platform, it is difficult to ensure that the positional relationship between the cameras will not change slightly

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