[SPAM:#] [Insight-users] Question about edge extraction

[Zachary Pincus]

The Canny edge detection filter may prove useful here. (I suggest=20
looking over the myriad references about Canny edge detection on the=20
web, such as: http://homepages.inf.ed.ac.uk/rbf/HIPR2/canny.htm -- the=20=

entire tutorial at this site is good.) A zero crossing filter may also=20=

be good (tutorial also at the above site).

A canny filter (and to a lesser extent the zero crossing filter) is=20
nice because the edges are constrained to be one pixel wide, and can=20
extend through regions of low signal.

Zach


On May 4, 2004, at 12:22 AM, Jiang wrote:

> Dear ITK users,
>
> I want to extract the edge picture from one image. And I use
>
>  itk::GradientMagnitudeImageFilter
>
> It works fine. However the output is float type. I want to get binary=20=

> output image. If I use
>
>  itk::BinaryThresholdImageFilter
>
> to filter the output to binary, and simply set=20
> SetUpperThreshold(),SetLowerThreshold() to some defined value, the=20
> binary edge is not good,
>
>  either with too much noise or the edge is not complete.
>
>  Could some one tell me how can I get good binary edge extraction=20
> result?
>
> =A0
>
> Thanks a lot!
>
> =A0
>
> =A0
>
> Chunyan Jiang