Edge curve scaling and smoothing with cubic spline interpolation for image upscaling
Wei‐Chen Wu, Tsun-Hsien Wang, Ching‐Te Chiu · 2013
In this paper, we propose an edge map up-scaling method. We propose an edge curve scaling method with cubic spline interpolation to up-scale an edge map. If an edge curve is directly applied to the cubic spline interpolation function for edge curve up-scaling, the edge curve scaling results have zigzag artifacts. We also propose a simple smoothing function to avoid the zigzag problems and maintain the contour shape of images. By predicting edge regions of the up-scaled image, we can recover high frequency components of edge regions of the up-scaled image to improve the sharpness and reduce ringing artifacts.