Abstract: Geometrical calibration is one of the key technologies for multi-channel projection system. In consideration of the complexity and expensive of existing correction methods which needs camera to collect the feedback images, a new algorithm is proposed to correct geometrical distortion. Firstly, the pixels of the uncorrected image are mapped to the cylindrical screen with equal-arc method. Then the correction of the geometrical distortion is realized by transforming the pixels on the cylindrical screen to the 2D coordinate of pre-corrected image according to perspective projection. Combined with simplified edge blending method it completes the high angle of attack flight simulation based on two projection channels. It can provide significant stall feeling so as to be a good platform for high angle of attack flight test analysis.

Key words: geometric distortion correction, equal-arc correction, edge blending, perspective projection, high angle of attack, F-16

摘要： 多通道曲面投影系统中曲面几何失真校正技术是关键，传统的曲面失真校正需要像机采集反馈图像，校正过程复杂，成本高昂且难以实现。本系统结合柱面幕，提出了一种新的基于曲面透视投影的等弧长离线校正方法。该方法将待校正图像的每个像素以弧长相等的方式映射到柱幕，再根据透视投影的原理将柱幕上的像素坐标变换到预校正图像的二维坐标。同时结合给出的简化边缘融合方法实现了基于柱幕投影的大迎角飞行仿真系统，观察人员站在柱幕前会有明显的失速感觉，从而为大迎角飞行试验分析提供了良好的仿真平台。

关键词: 几何失真校正, 等弧长校正, 边缘融合, 透视投影, 大迎角, F-16飞行器