Watershed-guided inpainting for image magnification

A new algorithm to preserve edges in image magnification is proposed. The algorithm is based on an inpainting technique: Blurry edges in the initially magnified image are erased using automatic edge detections, then the erased regions are filled with the filling priority guided by the watershed concept. The algorithm results in sharp patterns along the edges of the initial image, and the discontinuity across the edges is guaranteed. Experiments demonstrate that the algorithm is superior to some popular methods such as edge-directed interpolations and anisotropic diffusions.