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Re: 3D congrid without interpolation [message #53525 is a reply to message #53405]

Mon, 16 April 2007 11:43

mxhamidi
Messages: 3
Registered: April 2007

Junior Member

On Apr 14, 12:59 pm, kuy...@wizard.net wrote:

> However, another good reason is if you're re-binning categorical
> data, where the codes representing each category are arbitrary, and
> it's simply not meaningful to take the average of the category codes.
> If category 1 means 'corn' and category 3 means 'wheat', you don't
> want a thin barrier line of category 2 (meaning 'barley') to ocurr at
> the boundaries between wheat fields and corn fields. when you rebin
> your data. Nearest neighbor interpolation will always generate either
> 1 or 3 along that boundary.

This is very similar to my concern. I have maps of brain activity
with each value representing seeing a different angle in visual
space. I need resize my brain activity map (64 x 64 x 30) to fit onto
the anatomical image of the brain (256 x 256 x 256). With congrid (at
least with 3D congrid) the label of each coordinate is altered making
the resulting image uninterpretable. I think that I see if Qing's
idea of doing two steps of 2-D congrid will resize the activity map
without any averaging of the values.

Thanks for your replies.

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[Message index]

		Re: 3D congrid without interpolation By: James Kuyper on Sat, 14 April 2007 10:59
		Re: 3D congrid without interpolation By: JD Smith on Fri, 13 April 2007 18:00
		Re: 3D congrid without interpolation By: David Fanning on Fri, 13 April 2007 17:33
		Re: 3D congrid without interpolation By: JD Smith on Fri, 13 April 2007 15:57
		Re: 3D congrid without interpolation By: Mike[2] on Fri, 13 April 2007 08:21
		Re: 3D congrid without interpolation By: Qing on Thu, 12 April 2007 19:45
		Re: 3D congrid without interpolation By: David Fanning on Thu, 12 April 2007 17:30
		Re: 3D congrid without interpolation By: Michael Galloy on Thu, 12 April 2007 15:40
		Re: 3D congrid without interpolation By: David Fanning on Thu, 12 April 2007 14:19
		Re: 3D congrid without interpolation By: mxhamidi on Mon, 16 April 2007 11:43
		Re: 3D congrid without interpolation By: JD Smith on Mon, 23 April 2007 09:53

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