<div dir="ltr"><div><div>Richard, <br><br>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. <br>
<br></div>If you need some info, let me know so I take a look on my code. <br><br></div>Juan Rodriguez<br></div><div class="gmail_extra"><br clear="all"><div><div dir="ltr"><br>----<br><br>Ing. Juan Andrés Rodríguez</div>
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<br><br><div class="gmail_quote">On Sun, Oct 27, 2013 at 8:36 PM, Richard Frank <span dir="ltr"><<a href="mailto:rfrank@dominionsw.com" target="_blank">rfrank@dominionsw.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I am prototyping in Matlab and then implementing in ITK.<br>
<br>
When moving my line detection code to ITK, using the Houghtransform2DLinesImageFilter I got results that were not what I expected.<br>
<br>
I then created a simple input tiff file with a single white line.<br>
<br>
In Matlab, the output Hough space looks "correct".<br>
<br>
In ITK, the Output() image ( which is the Hough space) looks "different".<br>
<br>
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.....<br>
<br>
I believe it should only need to span -90 to 90.<br>
<br>
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.<br>
<br>
I made changes as I describe above, and now my output space matches Matlab's.<br>
<br>
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.<br>
<br>
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.<br>
<br>
<br>
Rick Frank<br>
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