Along with the development of digital processing TV and new-generation TV fully digitalized, video scan format conversion has become an important technology. In this paper, by incorporateing noise-reduced filter with edge-preserved into motion adaptive deinterlacing algorithm, a new algorithm for scan format conversion is proposed. The principle and structure for implementing this algorithm in hardware are discussed. Accordingly, the simulation experiment in FPGA (Field-Programmable Gate Arrays) is designed. The experimental results show that the algorithm proposed in the paper is very efficient.