基于投影仪-相机系统的多投影颜色校正技术

Color Correction for Multi-projector Screen Based on Projector-camera System

为了消除多投影大屏幕显示系统的颜色差异对虚拟现实系统仿真环境沉浸感和真实感的影响,提出了一种基于投影仪-相机系统的颜色校正优化方法,综合考虑校正系统中相机和投影仪的非线性影响。针对以往算法中忽略相机影响的问题,提出基于Pedro图像分割的高动态范围图像合成优化算法,引入新的权重函数,建立相机输入输出像素映射关系;结合相机的非线性响应关系,利用YUV与RGB色彩空间的转换模型结合函数逼近的方法对投影仪亮度和色度同时校正,生成投影仪颜色查找表,并利用着色语言实现颜色校正的GPU渲染。最后以三通道环形多投影屏幕为实验平台验证本算法的有效性。

In order to eliminate the influence on the immersion and realism for virtual reality simulation system environment, which was resulted from the color difference of the multi-projector display system, an optimization color correction algorithm based on projector-camera system was proposed. It considered the non-linear influence of both camera and projector. Unlike previous work, where the affection of camera was neglected, an optimized high Dynamic Range image reconstruction method based on Pedro＇s image segment and a new weighting function were put forward to establish the mapping relationship between input and output of camera＇s pixel value. With the mapping relationship of the camera, the integration of transform model between YUV and RGB color space and function approximation correction method was presented so that the luminance and chrominance of the projector were both corrected, and then the color lookup table was obtained. And the GPU rendering of color correction was realized by shading language. Based on a three-channel multi-projector display system, the algorithm proves effective for the color correction of multi-projector screen.