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Depth gradient based segmentation of overlapping foreground objects in range images

Using standard background modeling approaches, close or overlapping objects are often detected as a single blob. In this paper we propose a new and effective method to distinguish between overlapping foreground objects in data obtained from a time of flight sensor. For this we use fusion of the infrared and the range data channels. In addition a further processing step is introduced to evaluate if connected components should be further divided. This is done using nonmaximum suppression on strong depth gradients.