Multiresponse Image Gathering and Restoration

Abstract

This chapter presents a method of image gathering and restoration that can produce images with spatial detail that is finer than the sampling interval. The method consists of an image-gathering process that acquires A images, each with a different SFR that extends beyond the sampling passband, and a Wienermatrix filter that unscrambles and reassembles the within-passband and aliased signal components. If the SNR is sufficiently high, then the resolution can be increased by a factor approaching $1/\sqrt A$ times the sampling interval. However, practical applications may be rare, for this method requires, in addition to the high SNR, that the image-gathering device and the target remain stationary relative to each other during the image-gathering sequence or shift relative to each other by a known amount.