一种实用的多投影仪显示墙色彩校正方法

Practical color calibration method for multi-projectors display

针对多投影仪显示墙系统色彩不均匀性的问题,提出一种快速、实用的独立于几何校正结果的色彩校正方法。该方法利用细分网格变形技术将现有针对平面投影屏幕的色彩校正方法推广到适应任意光滑曲面投影屏幕,同时利用加权最小二乘曲线拟合思想降低色彩测量数据量。实际进行色彩校正时,采用可编程图形处理单元(GPU)的像素着色器对投影图像的每个像素进行实时校正计算,并在实际多投影仪显示墙系统中验证了方法的有效性。

A praetieal and efficient color calibration method was proposed to solve the problem of color non-uniformity in multi-projectors display system, which is independent of the geometric calibration. The method used technique of subdivision mesh defurmation to extend the traditional color calibration technology from planar screen to smooth curved screen. Meanwhile, the method needed a small quantity of measure data by using weighted least squares curve fitting. In real processing of color calibration, Graphics Processing Unit （GPU） programmable pipeline was used to correct each pixel of the projector image in real-time. The experimental results on real multi-projectors display system show that this method is effective.