Discrimination of water from shadow regions on SAR imagery

JianZhong Qian; Robert M. Haralick

doi:10.1117/12.21292

1 September 1990 Discrimination of water from shadow regions on SAR imagery

JianZhong Qian, Robert M. Haralick

Proceedings Volume 1297, Hybrid Image and Signal Processing II; (1990) https://doi.org/10.1117/12.21292
Event: 1990 Technical Symposium on Optics, Electro-Optics, and Sensors, 1990, Orlando, FL, United States

Abstract

Unlike MSS LANDSAT imagery and other photography the specific characteristics of the intensity of water and shadow in an SAlt image make the task of discriminating them extremely difficult. In this paper we present a scene analysis system for automatically identifying the water regions and shadow regions whose differences appear as subtle differences in tone and texture. In the preprocessing a region dependent Multi-threshold Adaptive Filter (MTAF) is proposed for texture preserving noise removal. In the low-level labeling a probabilistic relaxation algorithm with dynamic adaptive compatibility coefficients is provided to extract the initial object regions. In the high-level interpretation a relational graph model based on the knowledge of water and shadow regions on SAR imagery is constructed. Then spatial reasoning is carried out according to this relational model. The contextual information from different processing modules either at the pixel level or region level is consistently combined to reduce the labeling ambiguities. The experiments shown that more than 85 of shadow regions and water regions on a set of four SAR images can be identified correctly by this system. 1.

Citation Download Citation

JianZhong Qian and Robert M. Haralick "Discrimination of water from shadow regions on SAR imagery", Proc. SPIE 1297, Hybrid Image and Signal Processing II, (1 September 1990); https://doi.org/10.1117/12.21292

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