Visual Detection of Low Contrast Bands in Speckled Imagery

摘要

The human visual system performance in detecting low contrast bands in speckled imagery was examined. For exactly known signals it was found that approximately a 4.9-fold increase in signal amplitude was needed to achieve results comparable to the optimum matched filter detector. For signals of random orientation this factor is approximately 4.6. Due to the complex and largely unknown nature of the human visual system and the choices that must be made in preparing the images, caution must be exercised when applying these results. Keywords include: Visual detection, Speckled images, and Matched filter, Canada. (RH)