MATCHED FILTERING OF SMALL OBJECTS IN IMAGES CONTAINING CONSTANT SPATIAL INTERFERENCE
G. I. Gromilin, V. P. Kosykh, N. S. Yakovenko
Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: матричные ФПУ, пространственная неоднородность фотоэлектрических характеристик, обнаружение малоразмерных объектов, надёжность обнаружения, focal plane array, spatial inhomogeneity of photoelectric characteristics, detection of small objects, detection reliability
Abstract
The influence of the spatial inhomogeneity of the photoelectric characteristics of the focal plane array (FPA) on the quality of detecting small-sized objects in the image it forms is considered. It is shown that the traditionally used two-point correction is not optimal for subsequent matched image filtering aimed at improving the reliability of object detection under the conditions of spatially inhomogeneous FPA intrinsic noise. A two-stage algorithm for constructing a linear spatially invariant matched filter is proposed, which provides a significant increase in the reliability of detecting weak small-sized objects against the background of uncorrelated noise in images containing interference caused by the spatial inhomogeneity of the FPA characteristics.
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