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View Code? Open in Web Editor NEWSpatiotemporal GMM for Background Subtraction with Superpixel Hierarchy. Mingliang Chen, Xing Wei, Qingxiong Yang, Qing Li, Gang Wang, and Ming-Hsuan Yang. Abstract—We propose a background subtraction algorithm using hierarchical superpixel segmentation, spanning trees and optical flow. First, we generate superpixel segmentation trees using a number of Gaussian Mixture Models (GMMs) by treating each GMM asonevertex to construct spanning trees.