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Real time infrared video expansion based on edge

This paper proposes an edge-directed interpolation algorithm for infrared images. At present, the resolution of infrared focus planar array (IFPA) is relatively low. Conventional linear interpolation schemes such as the pixels replacement, the bilinear interpolation and the bicubic interpolation result in blurred edges and zigzag pictures. The correlation of different edge direction was calculated at each pixel to be interpolated to detect the edge and the edge direction. There are 13 directions in two quadrants we have chosen. Most edge can be detected in this range. Pixels at the edge are interpolated along the edge. The non-edge pixels are bilinearly interpolated. Simulation results show that the proposed method effectively removed the zigzag and blur at the edge caused by conventional linear interpolation. And this method is easy to be carried out by hardware.