function interpolate
Returns the interpolated value of a given position (x,y). If x and y are integers the value at that position is returned without any interpolation.
Syntax
result = interpolate(A, x, y [, kernel_size])
Arguments
| A: | A 2D-image. |
| x: | An real number. |
| x: | An real number. |
| kernel_size: | Any integer number, default is 4. Remember that points near the image border can't be interpolated (border-size is half the kernel-size) |