I am trying to shift an image in both x and y directions by a subpixel amount using bilinear interpolation. I believe the correct function to use for this is nppiRemap.
In matlab :
% dx - number of columns to shift image
% dy - number of rows to shift image
[X,Y] = meshgrid(1:c,1:r);
[X1,Y1] = meshgrid((1-dx):1:(c-dx),(1+dy:1:(r+dy));
shifted_img = interp2(X,Y,img,X1,Y1);
Is there a way to do this without having to create and populate 2 additional buffers the same size as the input image? Since dx and dy are constant across the entire image it seems there should be a way to use an offset.
I know I could create a custom kernel to do this but it seems like something pretty standard and I find it hard to believe that it is not available already… hate to reinvent the wheel.