计算机应用 ›› 2011, Vol. 31 ›› Issue (01): 65-69.

• 第八届中国计算机图形学大会优秀论文 • 上一篇    下一篇

多投影仪组合显示的自反馈亮度校正

周艳霞1,秦开怀1,罗建利2   

  1. 1. 清华大学
    2.
  • 收稿日期:2010-07-12 修回日期:2010-08-27 发布日期:2011-01-12 出版日期:2011-01-01
  • 通讯作者: 秦开怀
  • 基金资助:
    国家高技术研究发展计划(863计划)

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

  • Received:2010-07-12 Revised:2010-08-27 Online:2011-01-12 Published:2011-01-01
  • Supported by:
    The national high technology research and development program (863 program)

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

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