The application of Lanczos interpolation in video scaling system based on FPGA

Abstract

This paper proposes a video scaling hardware system based on Lanczos algorithm to achieve real-time high-quality scaling of video resolution at any ratio.The traditional image scaling algorithm has the problem that the interpolation result and the calculation speed cannot be ideal at the same time. The speed of bilinear interpolation and nearest neighbor interpolation algorithm is very high, but mosaics and blurred edges will occur. The interpolation effect of bicubic interpolation is better but the calculation speed is very slow. Experimental results show the interpolation effect of Lanczos algorithm is better than the traditional interpolation algorithm, and the time cost is less than bicubic interpolation. Real-time scaling of the video signal can be achieved in the FPGA system designed in this paper.