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图像投影仪是一种将图像投影到物体表面（通常是投影幕）上的光学设备。早期人们将幻灯片放置在书写玻璃台上，图像投影仪朝玻璃台发出灯光。现在的投影仪可以直接与计算机、DVD、游戏机、DV等设备直接连接[1]。
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