interpolating low-res 'blur'

[lionfish0]

Just coding up a method for using low-res blurred background subtraction.

Could switch to interpolating, but this needs some work.
Here's partly working code for this:

def rescaleInterpolate(im,x,y,patchSize,blocksize):
    from scipy.interpolate import RegularGridInterpolator
    ystart = y-patchSize
    yend = y+patchSize
    ys = np.arange(ystart,yend+blocksize,blocksize)
    xstart = x-patchSize
    xend = x+patchSize
    xs = np.arange(xstart,xend+blocksize,blocksize)
    print(xs.shape,ys.shape,im.shape)
    intp = RegularGridInterpolator((xs,ys),im[ystart//blocksize:yend//blocksize+1,xstart//blocksize:xend//blocksize+1])
    X, Y = np.meshgrid(np.arange(xstart,xend),np.arange(ystart,yend), indexing='ij')
    return intp((X,Y))