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分析了视频字符叠加的作用和发展现状，介绍基于中小规模集成电路、ＦＰＧＡ、单片机和专用芯片的四种实现方案，并对它们各自的特点简要地作了分析和比较。
This paper analyzes the function and development status of video character overlay, introduces four kinds of implementation schemes based on small and medium scale integrated circuits, FPGA, single chip and special chips, and briefly analyzes and compares their respective characteristics.