Two-Dimensional Encoding Masks for Hadamard Spectrometric Imager

Techniques to improve upon the design of two-dimensional encoding masks for multiplex Hadamard spectrometric imagers are described. The technique to generate masks based on completely orthonormal codes is described. In some cases, self-supporting masks result which were not previously known. Transmission through the encoding masks (but not necessarily the signal-to-noise ratio) can also be increased.