[Insight-users] How to use parameters for Hough Line detection

[Julien Jomier]

Hi Pavan,

 > know that my image contains say 5 lines, can I set this parameter to 5
 > and get the required results?

This is correct. The algorithm will pick the 5 maximum votes in the 
accumulator. Basically the algorithm blurs the accumulator and looks for 
the maximum number of votes, then draws a black disc to remove the 
previously choosen point in the accumulator space and tries to find the 
next one.

 >       Also I wanted a clarification on the AngleAxisSize and
 > AngleResolution parameters. Why should these be set to nearly the same
 > value?

Actually these two values should be the same, otherwise it doesn't make 
any sens. The AngleResolution is half the number of increments in the 
angle direction (PI/AngleResolution) to fill the accumulator space.
I've logged a bug in the bug tracker and fix it as soon as I can.

Thanks for the report,

Julien

Pavan Podila wrote:
> Hi,
>        I have been trying to understand the use of the "NumberOfLines"
> parameter for the Hough Line Detection filter. I want to know if the
> NumberOfLines picks the top voted points from the accumulator. If I
> know that my image contains say 5 lines, can I set this parameter to 5
> and get the required results?
>       Also I wanted a clarification on the AngleAxisSize and
> AngleResolution parameters. Why should these be set to nearly the same
> value?
> 
> Thanks,
> Pavan
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>