发明名称 |
System and method for analyzing a contour of an image by applying a sobel operator thereto |
摘要 |
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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申请公布号 |
US2005002570(A1) |
申请公布日期 |
2005.01.06 |
申请号 |
US20020193413 |
申请日期 |
2002.07.10 |
申请人 |
NORTHROP GRUMMAN CORPORATION |
发明人 |
CLARK WALTER D.;ABOUTALIB OMAR;SU LIYA |
分类号 |
G06K9/46;G06T5/00;(IPC1-7):G06K9/48;G06K9/36 |
主分类号 |
G06K9/46 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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