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介绍了一种通过两级查找表法实现可变长编码的方法,先对单个的游程编码数据进行可变长编码,再同时合并各个可变长编码码字形成码流输出;对两个查找表进行优化,节约了存储空间。采用流水线操作,提高数据处理能力,而且用RAM实现两个查找表,提高了系统可扩展性。通过FPGA的仿真,结果表明,可变长编码方法可很好地应用于数据吞吐量大的电视技术压缩编码中。
This paper introduces a method of variable-length coding by two-level look-up table method. Firstly, variable-length coding is performed on a single run-length coded data and then the variable-length coded words are combined to form a bitstream output. Table optimization, saving storage space. Pipeline operation to improve data processing capabilities, and the use of RAM to achieve two look-up table to improve system scalability. Through the simulation of FPGA, the result shows that the variable length coding method can be well applied to the compression of TV technology with large data throughput.