System and method for analyzing a contour of an image by applying a Sobel operator thereto
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United States of America Patent
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Oct 3, 2006
Grant Date -
Jan 6, 2005
app pub date -
Jul 10, 2002
filing date -
Jul 10, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention includes a method for analyzing an image wherein elements defining a path within a two-dimensional image are received from a prescreener. A Sobel operator may be applied to the region around each of the elements of the chain to obtain a corresponding array of gradient directions. An angle correction may be applied to any of the gradient directions that goes beyond the highest value (in radian measure; the Pi -Pi transition), to obtain an array of gradient directions free of any artificial jumps in value. The gradient direction array (Sobel chaincode) can have its bandwidth taken to determine a single number of straightness so as to identify extremely straight edges, (manmade objects) from less straight edges (natural objects). A similar process can be used to analyze contours for straight sections, which are also parallel. These two and other filters applied to the gradient array can be part of a feature suite, for feature space analysis.
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