1. A method for increasing the pixel count delivered from a plurality of electro-optical light detectors when scanning an object, comprising: positioning a mask, having a plurality of two dimensional Walsh-Hadamard filter patterns, in front of a plurality of light detectors to control the passage of light through the mask filter patterns to the light detectors, the mask and plurality of filter patterns being spaced adjacent to each other in respective planar and parallel alignment; positioning a lens assembly in front of the mask to project an image through the mask filter patterns on to the plurality of light detectors; moving the mask, plurality of light detectors, or the image in its plane parallel to the planar surface of the plurality of light detectors; and measuring the filtered image projected through the mask with the plurality of light detectors by creating and sequentially storing a digitized set of filter pattern blocks of data presenting the filtered image falling successively on different detectors, and sequentially and, subsequently, synchronously to the storage, retrieving a representation of the projected image from the stored set of data and performing an inverse Walsh-Hadamard transform on the stored set of data.