1. A method for increasing the perceived visual acuity between a high resolution video input device and a low resolution visual prosthesis said method comprising the steps of: inputting a high resolution video input as an array of pixels; selecting a plurality of subsets of said input pixels, wherein said pixels that are selected to form said subsets are periodically altered; processing said selected subsets to determine an output pixel value for each said selected subset; and outputting each said processed output pixel value to a corresponding output pixel in said low resolution visual prosthesis.