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Query regarding Edge histogram descriptor

by MSA last modified Jul 02, 2009 01:37 PM
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Query regarding Edge histogram descriptor

Posted by MSA at July 01. 2009
Hello All, According to standard,there are 5 types of edges i.e.horizontal,vertical,45 degree diagonal,135 degree diagonal and non directional. I have applied sobel edge detection algorithm. My question is 1) how do i identify the type of the edge whether it is horizontal/vertical? Thanks & Regards, MSA

Re: Query regarding Edge histogram descriptor

Posted by hme at July 02. 2009
The EHD operators are - in contrast to Sobel - asymmetric. For example, something like [-1 1 ; 1 -1] is used for diagonal edges. The intensity image is simply folded with each operators locally and the edge type is chosen by selecting the maximum output of the five operators (one for each type). If you want to use Sobel, I recommend computing the gradient and quantizing it to the four major directions (and "non-directional").
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