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In this paper, our goal is salient building outline enhancement andextraction from images taken from consumer cameras using L0 smoothing. Weaddress weak outlines and over-smoothing problem. Weak outlines are oftenundetected by edge extractors or easily smoothed out. We propose an iterativemethod, including the smoothing cell and sharpening cell. In the smoothingcell, we iteratively enlarge the smoothing level of the L0 smoothing. In thesharpening cell, we use Hough Transform to extract lines, based on theassumption that salient outlines for buildings are usually straight, andenhance those extracted lines. Our goal is to enhance line structures and dothe L0 smoothing simultaneously. Also, we propose to create building masks fromsemantic segmentation using an encoder-decoder network. The masks filter outirrelevant edges. We also provide an evaluation dataset on this task.

Salient Building Outline Enhancement and Extraction Using Iterative L0 Smoothing and Line Enhancing