[Insight-users] Filter Vs. Function

[Iván Macía]

Dear Brady,

A filter operates on regions of images by calculating values at every point
of the requested region. The result is usually an other image, at least with
ImageToImageFilter, that stores the calculated values. 

An image function returns a value for a given index, point or continuous
index of an image. Filters sometimes make use of image functions to
calculate the values for each of the pixels.

Hope that helps

Ivan


-----Mensaje original-----
De: insight-users-bounces at itk.org [mailto:insight-users-bounces at itk.org] En
nombre de Brady McCary
Enviado el: martes, 25 de noviembre de 2008 2:22
Para: insight-users at itk.org
Asunto: [Insight-users] Filter Vs. Function

Insight-users,

I am writing some level set image filters and I am trying to
understand the differences between ImageFilters and Functions. For
example:

BinaryThresholdImageFilter
BinaryThresholdImageFunction

or

GeodesicActiveContourLevelSetFunction
GeodesicActiveContourLevelSetImageFilter

Would someone please discuss this class separation (preferably the
reasoning behind it followed by an example)?

Brady
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