Abstract
The automatic recognition of water entails a wide range of applications, yet little attention has been paid to solve this specific problem. Current literature generally treats the problem as a part of more general recognition tasks, such as material recognition and dynamic texture recognition, without distinctively analyzing and characterizing the visual properties of water. The algorithm presented here introduces a hybrid descriptor based on the joint spatial and temporal local behaviour of water surfaces in videos. The temporal behaviour is quantified based on temporal brightness signals of local patches, while the spatial behaviour is characterized by Local Binary Pattern histograms. Based on the hybrid descriptor, the probability of a small region of being water is calculated using a Decision Forest. Furthermore, binary Markov Random Fields are used to segment the image frames. Experimental results on a new and publicly available water database and a subset of the DynTex database show the effectiveness of the method for discriminating water from other dynamic and static surfaces and objects.
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