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Unformatted text preview: e-center loci. Thus, the center of the searched circle is determined. With
the known circle radius, the image segmentation is complete. Intuitive proof that the Hough
transform can be successfully applied to images with incomplete information about the searched
objects and/or in the presence of additional structures and noise. Faculty of Engineering Robotics Technology MECH 4041 17
B.Eng (Hons.) Mechatronics S. Venkannah •
• Mechanical and Production Engineering Department The original Hough transform was designed to detect straight lines and curves
A big advantage of this approach is robustness of segmentation results; that is,
segmentation is not too sensitive to imperfect data or noise. Summary Edge-based Segmentation Faculty of Engineering Robotics Technology MECH 4041 18
B.Eng (Hons.) Mechatronics S. Venkannah Mechanical and Production Engineering Department Edge based segmentation relies on edges found in an image by edge detecting operatorsthese edges mark image locations of discontinuities in gray level, color, texture, etc…
The most common problems of edge based segmentation, caused by image noise or
unsuitable information in an image, are an edge presence in locations where there is no
border, and no edge presence where a real border exists.
Edge image thresholding is based on construction of an edge image that is processed by an
In edge relaxation, edge properties are considered in the context of neighboring edges. If
sufficient evidence of the border presence exists. Local edge strength increases and vice
versa. Using a global relaxation (optimization) process, continuous borders are constructed.
Three types of region borders may be formed: inner, outer, and extended. The inner border is
always part of a region, but the outer border never is. Therefore, using inner and outer
definition, two adjacent regions never have a common border. Extended borders are defines
as single common borders between adjacent regions still being specified by standard pixel
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This document was uploaded on 03/12/2014 for the course MECHANICAL 214 at University of Manchester.
- Spring '14