[Insight-users] itk::HoughTransform2DLinesImageFilter - implementation seems incorrect?

[Juan Rodríguez]

Richard,

I made an implementation a few months ago using the same filter. I did not
need to change anything to the code to get it working, but I did had some
trouble finding the parameters to obtain what I expected.

If you need some info, let me know so I take a look on my code.

Juan Rodriguez


----

Ing. Juan Andrés Rodríguez


On Sun, Oct 27, 2013 at 8:36 PM, Richard Frank <rfrank at dominionsw.com>wrote:

> I am prototyping in Matlab and then implementing in ITK.
>
> When moving my line detection code to ITK,  using the
> Houghtransform2DLinesImageFilter  I got results that were not what I
> expected.
>
> I then created a simple input tiff file with a single white line.
>
> In Matlab, the output Hough space looks "correct".
>
> In ITK, the Output() image ( which is the Hough space) looks "different".
>
> In looking at the code , I notice that the accumulator image for the Hough
> space seems to be the wrong size, and the inner loop goes from -180 to
> 180.....
>
> I believe it should only need to span -90 to 90.
>
> Also, if you use -90 to 90 I believe it's more usual to offset the Hough
> space so the origin is in the center.
>
> I made changes as I describe above, and now my output space matches
> Matlab's.
>
> Not sure where to go with this. I don't want to conclude the code doesn't
> work- maybe I'm not using it as intended. But I think all one has to do is
> create a file with a few lines and run the example code from the wiki and
> see if the output is correct.
>
> The example code has not input or output data included, so there's no way
> to know what the intended input / output should look like.
>
>
> Rick Frank
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