SIGNAL-TO-NOISE RATIO ANALYSIS AND EVALUATION OF THE HADAMARD IMAGING TECHNIQUE

摘要

The Hadamard imaging technique, using binary coded masks to scan image space mechanically, enables large numbers of image elements to be sampled simultaneously, in contrast to the sequential sampling of conventional imaging. This technique was originally used to improve the signal-to-noise ratio perfor¬mance of grating spectrometers. An analogous performance advantage when applied to imaging has not been verified. This paper analyzes the signal-to-noise ratio performance of the Hadamard imaging technique and presents an experimental evalu¬ation of a laboratory Hadamard imager. A comparison between the performances of Hadamard and conventional imaging techniques shows that the Hadamard technique is superior only when the imaging objective lens is required to have an effec-tive F number of about 2 or slower.