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Last Post 13 Mar 2006 01:56 PM by  anon
Interpolation queries...
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anon



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13 Mar 2006 01:56 PM
    I am currently using IDL 5.4 to generate a 3D volume using numerous 2D image slices. By using INTERPOLATE linear interpolation, I understand that I am able to produce evenly spaced interpolates between two interval points. Say, to create 12 evenly spaced interpolates between point 1 and point 30. I am trying to use bilinear/trilinear interpolation to do the same. Is it possible? If so, how do I go about it? The reason I need to do evenly spaced interpolates is due to the fact that I need to repeat the original image slices to get the volume. Thanks

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    13 Mar 2006 01:56 PM
    My understating is that INTERPOLATE automatically does bilinear interpolation when the data parameter is 2D, trilinear interpolation when the data parameter is 3D. Here is the explanation of the 'Return Value' in IDL's Online Help for INTERPOLATE: "Linear interpolates are returned in the one-dimensional case, bilinear in the two-dimensional case and trilinear interpolates in the three-dimensional case" Under the IDL Online Help index topic "interpolation", you will see many subtopics (e.g. Cubic, Quadratic, Quintic, Spline, etc.) that can point you to IDL's other interpolation alogirthm implementations, if those interest you.
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