![]() In both cases, a number of projectors are needed which are firstly overlapped and then visually joined together using an edge blending technique. ![]() This method is technically referred to as image butting because the projected images are butted up next to one another.įigure 1: A wide image that we want to project using three projectors.Īt first glance it might appear that the easiest way to produce this image across three projectors would be to line up the projectors next to each other. To try and accomplish this, the projectors are carefully arranged so that the right-hand edge of the left-hand projector sits perfectly next to the left-hand edge of the right-hand projector. Unfortunately, achieving a seamless image using this technique is near impossible. In principle it sounds easy, but in practice it is very hard to do. For example, an image may drift as they warm up and the brightness and colors will also differ slightly even if the same projector brand and model are used.įirstly, different projectors have different characteristics, even if you are using the same brand and model. ![]() Secondly, it is a difficult task to manually adjust a projector to exactly the right position so that they match up at the edges. Some areas will overlap whilst others will have a gap. This results in a tiled appearance, rather than a seamless one as shown in Figure 2. ![]() The answer lies with the use of image blending. When image blending, we overlap projectors to create what is referred to as an overlap region. ![]()
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