This operator returns a pixel value in one of the 4 input COPs connected to the VEX COP. The pixel may be in any plane, at any position, at any time. Use No Filtering if you aren’t querying a pixel at a different location than the current pixel, since it is the quickest input method. Use Bilinear Filtering for doing subpixel queries. Use Full Filtering when warping or transforming the input pixels, or when maximum filtering is required (it is the slowest but best quality filtering method).
The plane_index, array_index, u, v, and frame inputs all default to the value of global variables if they are not connected. The default values are as follows:
plane_index = PI array_index = AI u = IX or X as appropriate for the signature v = IY or Y as appropriate for the signature frame = F