Large Screen, Muti-user And Immersive Stereo Display System

With computer graphic technology continuing to develop, the virtual environment created by single-view images can not meet the requirement of users. Users want the virtual environment as the real world where the relative depth information between virtual objects and users or between virtual objects can be felt. Thus, stereo display technology has been gradually introduced into the application of large screen, muti-user and immersive simulation system.Compared with the physiological processes of establishing stereo vision in real world by human eyes, physical limitations of stereo displaying on screen based on binocular parallax models is analyzed. In order to generate parallax of two eyes images within the fusion area, parallax control methods are proposed. According to the given display device and the scale of the virtual scene, a precise calculation method of the virtual camera separation distance is given. The method can be applied to different physical display devices and different scale models of the virtual scene.The paper puts forward a way to split the scene depth. With the method, close-range objects can be mapped to the the larger fusion area of physical screen.Thereby the scope of close-range depth perception of objects is increased. The CAVE stereo display system is bult. Several ways suitable for projects on constructing stereo display system based on economical cave are given. A calibrating method suitable for CAVE is proposed. According to the reprojection, we calculate the control points, render the B-spline surfaces and map the textures to the B-spline curved surfaces of two eyes respectively. Thus, by calibrating geometry of two eyes images respectively, seamless joining is implemented in multi-channel stereo displaying system of CAVE. The position and smoothness of partial image can be calibrated by fine turning of control points and order of B-spline curved surfaces. For the construction of view coordinate system in the CAVE system which serves the six degrees of freedom simulatior, the concept of the initial vector VUP is proposed, and we establish contact between the roll of the analog camera and the initial vector VUP which rotates around the vector n. Then the general calculation method of the arbitrary vector VUP is deduced. At last, the application of multi-channel stereo displaying technology based on CAVE is successfully applied to helicopter simulator and container crane loading simulation system.