液晶与显示, 2014, 29 (4): 605, 网络出版: 2014-06-10   

小角度直线反走样的改进Wu算法

Modified anti-aliasing algorithm for small-angle line based on Wu algorithm
作者单位
南京航空航天大学 电子信息工程学院, 江苏 南京 210016
摘要
直线是机载座舱显示画面中最基本的图元, 其显示质量对于整个画面的显示效果影响较大, 尤其是小角度下直线显示的“麻花”现象一直是影响显示效果的关键问题之一。为了提高小角度下直线的显示效果, 本文提出了一种基于Wu算法的亮度渐变改进算法。该算法通过渐进地展现直线从轴方向上的亮度变化过程, 减少亮度畸变, 有效地改进了显示效果。通过Matlab仿真和FPGA实现, 验证了该算法反走样后的小角度直线显示效果明显优于其他算法, 而且结合中点画线法后, 绘制时间与Wu算法相当。同时该算法还可改善大角度直线和圆弧的显示效果, 消除了大角度直线的边缘锯齿, 解决了圆弧在小角度部分的虚化问题。因此本文算法可用于对实时性和显示效果要求高的机载座舱显示系统, 以缓解飞行员的视觉疲劳。
Abstract
Line is the most basic metafile of airborne cockpit display. Its display quality greatly affects the display of the entire frame, and the "twist" of small-angle line has been one of the key issues affecting the display effect. To get better display of small-angle lines, a new lightness gradient algorithm based on Wu is introduced in this paper. This algorithm reduces the lightness distortion in straight line′s subshaft to eliminate twists, which makes it looking like a smooth line. The Matlab simulation and FPGA implementation results show that compared with other anti-aliasing algorithm, the new algorithm improves remarkably the display quality of small-angle lines, while there is no increase in the processing time after combined with midpoint paint line algorithm. Furthermore, the new algorithm can also improve the display quality of large-angle lines and arcs by eliminating the jagged edges of large-angle lines and solving the blur problem of small-angle arcs. Therefore, the improved algorithm can be applied to airborne cockpit display system, which needs high display quality and real-time urgently, in order to relieve visual fatigue of the pilots.

李铂, 周建江, 夏伟杰, 吴连慧. 小角度直线反走样的改进Wu算法[J]. 液晶与显示, 2014, 29(4): 605. LI Bo, ZHOU Jian-jiang, XIA Wei-jie, WU Lian-hui. Modified anti-aliasing algorithm for small-angle line based on Wu algorithm[J]. Chinese Journal of Liquid Crystals and Displays, 2014, 29(4): 605.

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