1. An apparatus for reading encoded images comprising: focusing optics for collecting light; a photosensor positioned so as to receive light collected by said focusing optics, and generating a photosensor output signal thereby; a correlated double sampling circuit connected to said photosensor output signal, said correlated double sampling circuit comprising circuitry selected from the group consisting of: a dual slope processor and a dual sampler processor; and a decoder connected to said correlated double sampling circuit.