Abstract: In order to solve the problems in the traditional photometric correction, this paper presented a self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 results show that the approach can efficiently solve the problems of photometric correction for multiprojector autostereoscopic systems.

Key words: tiled display, photometric correction, adaptive feedback, photometric correction mask

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。

关键词: 组合显示, 亮度校正, 自反馈, 亮度校正模板