Embodiments provide for select indexing, which uses an array to simultaneously construct output sets for instructions that operate on input nodesets with common axes. In certain cases a processor-executed method for generating location identification codes is provided. A frequency sweep is conducted to exploit cavity resonance modes and thus further enhance the signal to noise ratio. This gives the user the impression that the device has captured image storage when, in fact, the previously captured images are actually stored elsewhere, such as on the computer’s hard disk.