Real-Time Detection of Lines and Grids: By PClines and Other Approaches

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Springer Science & Business Media, Sep 22, 2012 - Computers - 82 pages
This text provides a survey of the latest research into the Hough transform for line detection and its contemporary developments. Written with students in mind, this work can serve as a condensed textbook and as a reference for practitioners working in computer vision. The text also presents an overview and detailed elaboration of recent research related to PClines – a line parameterization based on parallel coordinates. A detailed analysis of the concept is given, including implementation details and measurements. One chapter discusses the detection of chessboard-like patterns, and sets of parallel lines and lines coincident with one (vanishing) point – a topic with many applications, such as 2D barcodes, aerial images, and architecture recognition. The work summarizes recent research in the field, and analyses new advances achieved using the PClines parameterization.
 

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Contents

1 Introduction
1
2 Review of Hough Transform for Line Detection
3
3 Variants of the Hough Transform for Straight Line Detection
17
4 PClines Line Parameterization Based on Parallel Coordinates
35
5 Vanishing Points Parallel Lines Grids
41
6 Efficient Implementation of PClines
55
7 Conclusion
69
Appendix APClines Octave Implementation
71
Appendix B CrossRatio in Matrix Form
73
Appendix C Horizon Orientation and Resampling Function
74
Appendix D Proof of the Equation for the Grid Lines
78
Index
79
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