[Insight-users] Help in Computer Vision

[Luis Ibanez]

Hi Harish,

Since the image that you are dealing with is a small
binary image, you can probably apply masks in order
to detect the corners.  You could reduce the corner
cases to just four, and build an operator that check
for the presence of any of the four cases in the 3x3
neighborhood of a pixel.

One way of doing this with ITK is to use the neighborhood
iterators. Please read the Chapter on Image Iterators
from the ITK Software Guide

    http://www.itk.org/ItkSoftwareGuide.pdf

In particular, you should look a the description of
neighborhood iterators at the end of the Chapter. Note
that the source code of all the examples presented in
the software guide is available in the directory:

           Insight/Examples/


You will find algorithms for Hough transforms in ITK,
both for Lines and Circles. Please look at the Doxygen
documentation page

http://www.itk.org/Insight/Doxygen/html/classes.html

In particular to
http://www.itk.org/Insight/Doxygen/html/classitk_1_1HoughTransform2DCirclesImageFilter.html
http://www.itk.org/Insight/Doxygen/html/classitk_1_1HoughTransform2DLinesImageFilter.html


Regards,


     Luis



-------------------------------
Harish Chand Koyalagundla wrote:
> 
>  Hi,
>  
>  I'm Harish from University of New Orleans, Louisiana. I need little 
>  help. I have few questions....
>  
> 1) I have a 7x5 binary image and I need to calculate its corners. How
> do I do that?
>  I need to solve it.
> 
>  I'm providing the link,
>  
>  http://www.cs.uno.edu/~yixin/CSCI6633/
>  
>  Click Homework Assignments: Homework 2
>  
>  Question - 4.
> 
> 2) Can anyone give me an algorithm for Hough Curves?
>  
>  Thanks in advance,
>  
>  Harish Koyalagundla
>  
> 
> 
> 
> 
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