多投影仪组合显示的自反馈亮度校正  

Self-feedback photometric correction approach for multi-projector tiled display

作　　者：周艳霞[1,2] 秦开怀[1] 罗建利[1] 

机构地区：[1]清华大学计算机科学与技术系,北京100084 [2]石家庄陆军指挥学院军事运筹中心,石家庄050086

出　　处：《计算机应用》2011年第1期65-69,共5页journal of Computer Applications

基　　金：国家863计划项目(2006AA01Z326)

摘　　要：针对目前的亮度校正方法存在的问题,提出了闭环的自反馈亮度校正方法。该方法首先计算一个初始模板;然后在反馈过程中,使用模板对白色图像进行亮度衰减,根据相机获取的投影图像,以及屏幕与投影仪坐标的对应关系,用一定的模板修正规则来修正每个投影仪对应的亮度校正模板;重复反馈过程,直到达到亮度一致的约束条件。该方法避免了亮度响应曲线的复杂又耗时的测量工作,通过迭代反馈来不断修正亮度校正模板,最终使得亮度校正后的图像投影后逼近亮度一致。自反馈亮度校正方法中计算的初始亮度校正模板过渡更均匀,消除了模板中的三角带问题;采用的模板更新方法能够使迭代反馈过程更快地收敛。实验证明,该方法能够有效地解决自由立体投影显示系统中的亮度校正问题。In order to solve the problems in the traditional photometric correction, this paper presented a serf-feedback photometric correction approach. The proposed approach first calculated an initial mask, and then updated the photometric correction mask based on the images captured in a feedback process with a camera. It iterated the feedback process until the uniformity of luminance was less than a threshold value. The initial mask computed by the approach had better photometric transition than the traditional blending masks, and the mask-correction rules adopted in the approach can get better color uniformity after several self-feedback steps. The experimental resuhs show that the approach can efficiently solve the problems of photometric correction for multi-projector autostereoscopic systems,

关 键 词：组合显示 亮度校正 自反馈 亮度校正模板 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]