Workpiece multi-dimension multi-parameter measuring method based on image processing

A measurement method and image processing technology, applied in measurement devices, instruments, optical devices, etc., can solve the problem of not many measurement platforms, and achieve the effect of saving measurement time, ensuring measurement accuracy, and reducing measurement difficulty.

Active Publication Date: 2017-02-22
NANJING UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many non-contact measurement methods, but there are not many unified measurement platforms for various sizes and parameters. This is the innovation

Method used

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  • Workpiece multi-dimension multi-parameter measuring method based on image processing
  • Workpiece multi-dimension multi-parameter measuring method based on image processing
  • Workpiece multi-dimension multi-parameter measuring method based on image processing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 measuring method:

[0036] In some cases, it is necessary to use laser scanning to obtain workpiece parameters, then use such as diagram 2-1 The process of measuring workpieces includes the following steps:

[0037] Step 1. Input the workpiece parameters to be measured. The workpiece parameters include workpiece size, hole diameter, center distance of the hole, etc.;

[0038] Step 2: Fix the industrial measurement camera to shoot the workpiece, and use the scale calibration of the platform in the area to be measured to estimate the size and position of the workpiece;

[0039] Step 3. Through the relationship between the estimated length of the workpiece in the X-axis direction and the single scanning width of the laser scanner, it is judged whether the workpiece can be scanned once;

[0040] Step 4. If the workpiece can be scanned once, move the motor to the corresponding position, scan the workpiece with a laser scanner, process the point cloud data obt...

Embodiment 2

[0043] Embodiment 2 measuring method:

[0044] In some cases, it is necessary to take pictures to obtain workpiece parameters, for example: the image parameter information of the workpiece surface is required or only unilateral workpiece surface information is required, then use such as Figure 2-2 The process of measuring workpieces includes the following steps:

[0045] Step 1. Input the surface parameter information of the workpiece to be measured;

[0046] Step 2: Fix the industrial measurement camera to shoot the workpiece, and use the scale calibration of the platform in the area to be measured to estimate the size and position of the workpiece;

[0047] Step 3. According to the estimated size of the workpiece, determine whether the industrial measuring camera installed on the motor can obtain the surface image of the workpiece at one time;

[0048] Step 4. If the surface image of the workpiece can be captured by the industrial measuring camera once, the linear motor m...

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Abstract

The invention provides a workpiece multi-dimension multi-parameter measuring method based on image processing. Multi-dimension multi-parameter measurement of a to-be-measured object is realized at a measuring platform. The platform is formed by processing software, a scanner, a camera, a linear motor, and a motion slide rail etc. Before a batch of workpieces are measured, required parameters are input through control software and compared with preset thresholds, and different processing modules are started according to characteristics of measuring parameters. After the selection of a solution, the position of a to-be-measured area is estimated through shooting of the camera and the parameters preset by the software, the scanner is driven to scan the workpieces by the linear motor through the slide rail, and the absolute value of each parameter is calculated after obtaining of point cloud data. According to the method, the general measuring platform is established, the cost and the measuring time are reduced, and the precision requirement of measurement is met.

Description

technical field [0001] The invention relates to technologies such as image processing, machine vision and sensors, and is a multi-size and multi-parameter general measurement method based on laser scanning with image processing as the core. Background technique [0002] Traditional detection methods mainly use contact measurement, usually using tools such as sine gauges, vernier calipers, and micrometers on a fixed measurement platform, or three-coordinate measuring machines using contact sensors. The performance of traditional measurement methods in terms of speed is not ideal, and it is difficult to meet the needs of industrial production inspection at this stage. With the development of photoelectric technology, computer technology and machine vision, non-contact measurement methods such as photogrammetry, line laser and laser scanner have been widely used. The laser scanning method can obtain a large number of measurement points in a very short time, so it is widely use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/00
CPCG01B11/00
Inventor 梅雪夏安冬何毅陶春松李峰张鹏董婷婷
Owner NANJING UNIV OF TECH
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