forward mapping -why is difficult

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david
david 2014-3-4
hi
I am trying to complete a project and it involves forward mapping for images. I have the original image (mxn) pixel locations. I have applied a (moving least squares deformation) transformation to it and obtained new pixel locations 'u' and 'v'.My (u,v) pixels are a non integer numbers..so i need to preform a bi linear interpolation (because the output image grid is a integers numbers).
i need to calculate the distance between the (u,v) pixels to the nearest 4 output grid.
from reading on mathworks web : forward mapping
it is difficult to preform interpolation in the output grid...why? ( i need to find an exploitation why it hard to find the distance between the warped pixels and the output grid for interpolation)
thanks

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