Dissertation > Excellent graduate degree dissertation topics show

The Topography Measurement of Depressed Airway Based on Machine Vision

Author: ZhangXiaoMeng
Tutor: ZhangRuiFeng
School: Tianjin University
Course: Electromagnetic Field and Microwave Technology
Keywords: Depression morphology Sub pixel Cylinder axis measuring Coordinate conversion
CLC: TP274
Type: Master's thesis
Year: 2012
Downloads: 1
Quote: 0
Read: Download Dissertation

Abstract


The machine vision is used to realize the precision measurement. And it caneffectively improve the industrial detection efficiency that machine vision isintroduced into the industrial measurement. In the industrial manufacturing, variousmodels were used, and they were very difficult to detect because of the complexity ofthe structure. The paper used a suitable method to measure the depression and nestedsurface of diesel engine work piece and had a higher accuracy. The main contents ofthis paper are follows:1. The work piece parameters in the camera coordinates must be converted intophysical coordinates to compare with standard. So the paper studied the rotatingprinciple of coordinates, and realized conversion of the camera coordinates tophysical coordinate system. Then compared with the actual data and analyzed theerror. In order to eliminate the error, we mainly analyzed the influence of light center,camera calibration and distortion correction. Using Hessian matrix to obtain the lightcenter can reach the sub pixel, and can effectively change the accuracy.2. In order to calculate the cylindrical axis vector, and avoid calculating threedimensional curvature and3D surface fitting, a new method is proposed. Because the3D points got by scanning were in the light plane, the points would intersect withcylindrical points after rotating the light plane. When the intersection was a straightline, the line was cylindrical axis vector. The3D points were analyzed intwo-dimensional light plane to fitting line slope avoiding for3-dimensional curvature,simplifying the computation. The experiment of the measurement for the dieselcylinder head surface hole indicated that this method had a high accuracy, and themethod was simple.3. Considering to the surface characteristics of the cylinder head, we realized theconversion of coordinates based on the local hole. Then we obtained the data of holeto measure by the depth and radius difference of the hole needed and the interferentialhole. The method has certain guiding significance for the measuring of depression andnested morphology.

Related Dissertations

  1. Research and Application of Camera Calibration in Vision Measurement System,TP391.41
  2. The Research on Sub-Pixel Edge Detection Method in Work Piece Image,TP391.41
  3. Improve vehicle missile launchers deformation Method of measurement accuracy,TJ768.21
  4. STM32 based on linear CCD and accurate measurement of the diameter of the needle research,TH133.333
  5. A Research on High Precision Attitude Measure Technology Based on Astronomical Observation,TP274
  6. Coordinate Systems in the Informationized Surveyingand Mapping and Itsapplication Research,P228.4
  7. Design and Implementation of the Geometric Distortion Correction of Map Scanning Digitization,P208
  8. Automatic Deformation Monitoring Data Processing Taking into Account Stations Deformation,P228.4
  9. Research on Object’s Dimension Measurement Technique Based on Strctured-Light Vision,TP391.41
  10. High Precision Ranging Based on Binocular CCD,TP391.41
  11. Study of Corner Detection in Camera Calibration,TP391.41
  12. Research on Distributed Infrared Multi-senors Target Data- Associaton Technology,O241.5
  13. Calibration of Underwater Acoustic Target Positioning System,U666.7
  14. Research on Required Navigation Performance Based on Flight Data,V249
  15. Research on Super-resolution Reconstruction from Passive Millimeter Wave Image,TP391.41
  16. Research of Coordinate Conversion in Interactive Smart Board Basing on Electromagnetic Induction Technology,TP391.6
  17. Theory and Application of Laser Scanning Probe in the Flexible Coordinate Measuring Machines,TH721
  18. Research on an Improved Image Synthesizing Algorithm for Lenticular-based LCD Auto-Stereo Display,TP391.41
  19. Design and Research of an Automatic Optical Inspection System for PCB,TN41
  20. Non-contact Measurement and Analysis of Structure Size on Planar Slot Antenna,TN823.24
  21. Sub-pixel Edge Detection Based on Hyperbolic Tangent,TP391.41

CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation systems > Data processing, data processing system
© 2012 www.DissertationTopic.Net  Mobile