In the ideal case, the size of central patch T in sliding window should be approximated to the target size. In fact, the size of small target usually changes in different frame. If the scale of patch T is smaller than target, the potential target may be masked by the adjacent background regions, causing missing detection. On the contrary, if the size of central patch is too big, the false alarm rate may rise. In order to solve this problem, a multiscale local homogeneity measure (MLHM) is
