基于多投影仪的无缝拼接显示是对图形、图像、视频等进行大范围、高分辨率显示的一种有效实现方式。多投影仪无缝拼接显示的一个关键是解决颜色失调问题，而现有的颜色失调原因的分析结果可归纳为投影仪输出颜色的变化特性和投影屏幕与投影环境的影响两个方面。近年来，为解决该问题已提出了多种颜色校正技术，而根据解决颜色失调问题的原理和实现方法的不同，这些技术可分为基于边缘融合的校正技术、基于单一投影光源的校正技术和基于颜色/亮度输出匹配的校正技术3类，并对这3类技术在无缝拼接显示效果、可维护性和可扩展性等方面的优缺点进行了较详细分析，该领域下一步的研究将会朝着兼顾不同投影机类型、不同形状和反射特性的投影屏幕和考虑运动中观察者的实时颜色校正方向发展。

The seamless tiled display that is based on the multi projector is an effective realization for the wide field and high resolution display of graph, image, video and so on. The key problem for the seamless tiled display is the solution of color maladjustment. The existing analysis result of the reason for color maladjustment includes two parts, one is the variation characteristic of the projectors color output, and the other is the effect of the projecting screen and environment. So many photometric calibration techniques are proposed in recent years, and there are three types in sum which include edge blending based calibration technique, single projector light based calibration technique and gamut output matching based calibration technique according to the principle and implement method of the solution for color maladjustment problem. We compare the advantage and disadvantage of these three techniques in the seamless display effect, maintainability, expansibility and other aspects. The future of this field is the real time photometric calibration considering different type of projector, different shape and reflecting characteristic of display screen and moveable observer.