基于FPGA的去反走样黑边锯齿视频叠加方法设计  

A FPGA-based Design of Anti-Aliasing and Black-Edge Sawtooth Video Superposition Method

作　　者：张杰 王昱煜 苗莉 于小燕 ZHANG Jie;WANG Yuyu;MIAO Li;YU Xiaoyan(Suzhou Changfeng Avionics Co.,Ltd.,Suzhou Jiangsu 215151,China)

机构地区：[1]苏州长风航空电子有限公司,江苏苏州215151

出　　处：《信息与电脑》2021年第8期59-62,共4页Information & Computer

摘　　要：在机载显示系统中,视频叠加技术有着极为广泛的应用。传统的视频叠加算法在处理反走样图形的叠加时,对反走样边界的处理效果较差,叠加后的反走样图形边界往往呈现出一种黑边锯齿效应。针对上述问题,本文提出一种根据前景灰度等级对透明度系数进行调节的视频叠加方法,并利用FPGA进行了实现。测试结果表明,该种视频叠加方式能够有效地解决前后景叠加后,前景反走样边界的黑边锯齿问题,大大改善了画面显示效果。In the airborne display system, video overlay technology has a very wide range of applications. When the traditional video superposition algorithm deals with the superposition of anti-aliasing graphics, the processing effect of anti-aliasing borders is poor, and the superimposed anti-aliasing graphics borders often show a black edge jagged effect. In response to the above problems, this paper proposes a video overlay method that adjusts the transparency coefficient according to the foreground gray level, and implements it using FPGA. Practical tests show that this video superposition method can effectively solve the problem of the black edge and jagged edges of the foreground anti-aliasing boundary after the front and rear scenes are superimposed, which greatly improves the picture display effect.

关 键 词：FPGA 视频叠加 RGB灰度等级 图形反走样 流水线操作 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]