Research And Implementation On Projector Array Display System

Large-screen display system has the characteristics of high resolution, large phys-ical size and immersion. There are actual application requirements in many fields, such as virtual reality, industrial design and entertainment, etc. But the cost of tradi-tional large-screen display system based on multiple optical screens or high-resolution projector is very expensive. However, using multi-projector seamless splicing and par-allel display technology to implement large-screen display system is easy to install and simple to use. It also has the characteristics of low cost and strong extensibility. Therefore, the research on projector array display system has great practical value and significance.The key problems to implement projector array display system are the changeabil-ity of physical location and the difference of projection images in color and brightness. Moreover, with the increase of the projector array size, the implementation of automat-ical installation and calibration for projector array has become a key research direction.The main research contents of projector array display system include geometric correction, color correction, edge blending and real-time parallel display. This thesis mainly discusses geometric correction, edge blending and real-time parallel display. This thesis proposes a complete set of geometric correction and edge blending algo-rithm. Furthermore, we design and implement a prototype system which is capable of real-time parallel displaying.Firstly, this thesis uses the least squares method to calculate the coordinate map-ping matrix between projection image and screen image for flat screen model. Then projection image will be transformed to meet requirements before displaying. The w-hole process of geometric correction only needs such a few manual operations that the correction is fast. Secondly, this thesis presents a nonlinear brightness blending method based on cosine function for overlap region blending of projection images. After gam-ma correction, the system eliminates the highlight in overlap region of projection im-age and make the border transition smooth for the goal of seamless splicing. Finally, in terms of real-time parallel display, this thesis utilizes GPU to accelerate the process of geometric correction and edge blending. With the addition of multi-threading mecha-nism, the prototype system achieves the goal of real-time processing and playing for high resolution video.In this thesis, the prototype system uses only one camera to collect geometric in-formation. It’s simple, easy-to-equip and low-cost. Therefore, it can be widely applied to school, shopping mall, exhibition hall and other places.