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Research on Fast Corner Extraction Algorithm in Camera Calibration

Author: HeJuan
Tutor: Zhang
School: National University of Defense Science and Technology
Course: Instrument Science and Technology
Keywords: Machine Vision Camera Calibration Corner detection Corner Sort Hessian matrix Homography
CLC: TP391.41
Type: Master's thesis
Year: 2011
Downloads: 53
Quote: 0
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Abstract


In the field of robot navigation, unmanned combat platforms , industrial control , vision measurement applications is constantly expanding and deepening of the visual system online , real-time , reliable access to the information of the target three-dimensional space to put a higher demand . Camera calibration as an important part of the three-dimensional reconstruction , also face greater challenges . Image feature point extraction is restricting the visual system to achieve a major bottleneck for online real-time calibration checkerboard corners the typical calibration features as the research object , checkerboard corner extraction algorithm accuracy is low , real-time and poor insufficient In this research as a starting point . In this paper, the automatic detection algorithm based on the corners of the Hessian matrix -based adaptive threshold Homography corner automatic sorting algorithm on the basis of the study generic corner detection algorithm , a typical checkerboard corners detection and sorting algorithms . Automatic corner detection algorithm based on the adaptive threshold Hessian matrix , based on the characteristics of the the checkerboard corners at the Hessian matrix constructed distinction corner background shape operator designed adaptive threshold to determine the shape operator , with the checkerboard corners the point symmetry pseudo corner be removed . Homography - based corner automatic sorting algorithm , designed two checkerboard four - pole automatic identification and matching methods to complete the calculation of the Homography and get a good sort of effect . Sort resulting corner coordinates of the pixel level as the initial value , to complete precise positioning of the corner in their neighborhood . Validated by experimental fast algorithm for extracting this article checkerboard corner , the experimental results show that : this article corner extraction algorithm computing , real-time , high accuracy ; this corner extraction results are applied to the camera calibration , the calibration results with traditional calibration results equivalent to prove the effectiveness of the proposed algorithm . Finally, a summary of the thesis work , suggest further research .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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