Depth edge based trilateral filter method for stereo matching

Recently, trilateral filter based method is more accurate than other local stereo matching methods on Middlebury benchmark. The boundary strength term is the key part of this method, which is computed from a color edge map. In this paper, we prove that boundary strength term, computed from a depth edge map, produces more accurate results. Then, we propose a depth edge detection technique to obtain an accurate depth edge map and present a depth edge based trilateral filter method. The experimental evaluation on the Middlebury benchmark shows that the proposed method outperforms the original trilateral filter method and also other local methods.