[Insight-users] Filters for converting images to regular or irregular grids

[Ali -]

Hi,

Assume an image filter which takes an ordinary gray-scale image as input and generated a set of 'points' as output. For instance, consider a binary thresholding filter where the output is supposed to be the 2D positions or the pixel intensity of the centriods. In this case the positions of the centriods form an irregular grid, however, this question also involves structured grids.

Is there any available filters in ITK which can convert an image to a grid where each grid point can hold a scalar or vector value?

If not, one way of implementing this could be by using a storing the grid points in an ordinary image, where the non-grid points must be marked with a data type which is different to the pixel value type. Some high-level languages support things like 'not-a-number' which are useful in a case like this, but I am not sure if this is supported in ITK.

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