Polygon Code

[atraya narvekar]

Dear All

I am trying to understand the polygon code. I am currently studying
polygon drawing,polygon interaction mode and polygon scan convert
codes. Do I need to refer to any other files?

Also I would like to know how to get a pixel value when I click on the
image.

please help me

[Paul Yushkevich]

I am trying to understand the polygon code. I am currently studying
polygon drawing,polygon interaction mode and polygon scan convert
codes. Do I need to refer to any other files?

It's mostly self-contained, but also see UserInterfaceLogic.cxx and GenericSliceWindow.cxx

 

Also I would like to know how to get a pixel value when I click on the
image.

IRISApplication app = ...

app->GetCurrentImageData()->GetGrey()->GetVoxel()

 

please help me

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Department of Radiology
University of Pennsylvania

[atraya narvekar]

Thanks for replying.

Appreciate your help.

Got a lil frustrated when no one replied.

[atraya narvekar]

Hello sir

Thanks to your help I was able to study the polygon code fully. In
Handle() function we get the x and y values which are stored in the
list type Vertex(structure). I wanted to know if I can find Gradient
Magnitude, Gradient Direction, Intensity Value at that (x,y) co-
ordinate and also apply zero crossing. If this can be done please Tell
me which header files I need to include.

Thanking you

[Paul Yushkevich]

You would have to use ITK image gradient filters to interrogate the
gradient direction at a vertex. Have you read the ITK Software Guide?

[atraya narvekar]

Hello sir
I have downloaded Itk software guide. I had gone through those
gradient files like descreterecursivegradientmagniyude and all but i
dint understand how to apply it. Can you please explain me in one two
lines how to use it in external files?? if possible. I am still going
through those files but the guide is kind of vast so i needed only
specific things to study because of time constraints.

> > For more options, visit this group athttp://groups.google.com/group/itksnap-dev?hl=en.

[Paul Yushkevich]

Basically, you would create a gradient filter, pass in the image using
SetInput(), execute Update() on the filter, get the result using
GetOutput() on the filter. Then get the value at a voxel location
using GetPixel() on the output image. If you need to interpolate the
gradient vector away from a voxel center, use the
VectorImageLinearInterpolateImageFunction.h class

The use of filters and interpolators is explained early in the ITK
software guide.

[atraya narvekar]

Thank you sir Paul, I'll start reading and experimenting. THANK YOU
very very much.

On Mar 26, 11:10 am, Paul Yushkevich <pau...@mail.med.upenn.edu>
wrote: