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采用新型二步索引算法实现了一种字符索引结构的OSD电路。该算法是在改进型二步索引算法的基础上,为实现OSD界面的多区域字符灵活显示而进行优化的算法,通过引入字符显示区编号,使得该算法在实现字符二步索引时更加方便。基于该算法的OSD电路在保留原算法电路优点的基础上实现了各行字符显示的独立性,使得字符显示更加灵活。通过FPGA进行了电路功能验证,证实了本算法的可行性。
Using a new two-step index algorithm to achieve a character index structure of the OSD circuit. The algorithm is based on the improved two-step indexing algorithm, which is used to optimize the multi-area character display in OSD interface. By introducing the number of the character display area, the algorithm is more convenient to realize the two-step indexing of characters. The OSD circuit based on the algorithm realizes the independence of the character display of each line on the basis of retaining the advantages of the original algorithm circuit and makes the character display more flexible. Through the FPGA circuit functional verification, confirmed the feasibility of this algorithm.