Procedure to represent an optical scene by using the walsh-hadamard transform and image sensor therefor

摘要

The method involves measuring the radiometric parameters of NxN points in a scene to provide NxN electrical signals representing the real two-dimensional image. NxN weighting functions called masks are generated and applied to the signals. The weighted signals are then added to obtain NxN Walsh-Hadamard weighted coefficients (X(n,m)) which represent the optical scene. An image sensor is provided which is formed from a matrix (10) of photodetector elements (Pij) and is connected to blocks (12,14) for generation and memorisation of Walsh functions. A weighting module (16) performs the weighting operation and addition of the weighted signals.