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Line target recognition in discrete space is a difficulty in the field of image processing. Line features in the scene include tracks, roads, rivers, bridges and field boundaries. Usually, target features include amplitude, histogram and statistics characterizations. However, these features are insufficient to describe a line target for a practical image. Utilizing the geometry of target, we present the definitions and computation methods of length, orientation angle, smoothness degree, roughness degree, and barycenter for line target in discrete space. Computational examples show that these new definitions can exactly character line target such that it can provide new theoretical and technical supports for image processing of line target in discrete space.Index Terms-feature extraction, line feature, image processing, synthetic aperture radar (SAR) image.

Polarimetric SAR interferometry (POLINSAR) is a very promising technique by combining polarimetric technique and interferometric technique. It can be applied to the area of remote sensing and measurement of structure over forest terrain. At present, many POLINSAR systems were developed, and the first POLINSAR prototype in China is also developed by 38 th Research Institute of CETC. Lots of data are acquired by these systems, so POLINSAR techniques have been studied as hot research topics in the area of SAR remote sensing in recent years. In this paper, we introduce design of the POLINSAR prototype and demonstration of system parameters, and we also study coherence and elevation precision by computer simulation.