提出一种基于双狭缝光栅的裸眼三维立体投影机。该立体投影机由普通投影机组成的投影机阵列、投影屏和位于投影屏两侧的两个狭缝光栅组成。投影机阵列一侧的光栅对畸变的投影图像进行校对，以便图像的像素大小与位于观看者一侧的光栅的节距相匹配。对该立体投影机的立体显示原理、参数设计计算进行了阐述。实际研制了1台50英寸裸眼三维立体投影机样机，该样机采用了由4台液晶投影机组成的投影机阵列，能显示静态、动画和视频立体图像，其三维立体显示分辨率与相应二维平面显示分辨率相当。

An autostereoscopic 3D projector based on two parallax barrier plates is proposed. The autostereoscopic 3D projector is composed of a projector array, a projection screen and two parallax barrier plates located at the two sides of the projection screen. A parallax barrier plate facing to the projector array is used to collimate the images which have aberrations on the edge of the projection screen, so the pixel size of the images can be matched with the size and periodicity of the other parallax barrier plate. The principles of the stereo imaging and the calculation equations for the parallax barrier plates are described in detail. A 50 inch autostereoscopic 3D projector prototype with a four-liquid-crystal-projector array is developed. The presentation of 3D static, animation and video images are realized by the autostereoscopic 3D projector; especially the resolution of the 3D images is the same as that of the corresponding 2D images.