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The goal in many tasks is for the regions to represent meaningful areas of the image such as :
crops, urban areas, and forests of a satellite image.
Regions might be sets of border pixels grouped into such structures as line segments and
circular arc segments
Regions may also be defined as groups of pixels having both a border and a particular shape
such as a circle or ellipse or polygon
When image do not cover whole image, segmentation can consider foreground regions of
interest and background regions to be ignored.
Objectives: Faculty of Engineering Robotics Technology MECH 4041 1
B.Eng (Hons.) Mechatronics S. Venkannah Mechanical and Production Engineering Department To decompose the image into parts for further analysis. In simple cases, the environment
might be well enough controlled so that the segmentation process reliably extracts only the
parts that need to be analyzed further.
To perform a change of representation. The pixels of the image must be organized into
higher-level units that are either more meaningful or more efficient for further analysis.
Regions of an image segmentation should be uniform and homogeneous with respect to some
characteristic, such as gray level, color, or texture
Region interiors should be simple and without many small holes
Adjacent regions of a segmentation should have significantly different values with respect to
the characteristic on which they are uniform.
Boundaries of each segment should be smooth, not ragged, and should be spatially accurate.
Achieving all these desired properties is difficult because strictly uniform and homogeneous
regions are typically full of small holes and have ragged boundaries.
Insisting that adjacent regions have large differences in values can cause regions to merge and
boundaries to be lost.
The regions that human see as homogeneous may not be homogeneous in terms of low level
features available to the segmentation system. So higher level knowledge may have to be used.
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This document was uploaded on 03/12/2014 for the course MECHANICAL 214 at University of Manchester.
- Spring '14