基于嵌入式结构光的多投影显示系统
发布时间：2019-04-26 14:05
【摘要】：随着投影显示技术的快速发展,在大规模科学计算可视化、军事仿真、工程设计、会展行业和数字影院等诸多领域,多投影显示系统以高分辨率、大显示尺寸和强沉浸感等优势得到广泛应用。多投影显示系统允许投影仪的位置并不严格整齐,通过几何校正过程对计算机输出图像进行几何变形,使其通过投影仪光学系统后显示在屏幕的正确位置。现有多投影系统多要求投影仪摆放不得变动,否则将影响拼接效果,无法应用于需要执行实时任务的工作环境。如何构建具有实时自主投影校正能力的多投影系统成为一个重要问题。 本文给出了一套基于嵌入式结构光的多投影显示系统,具有实时自主投影校正能力。本文系统包括一个主控节点及多个显示节点。主控节点连接多部相机实时拍摄投影画面。每个显示节点通过逐像素修改显示画面亮度值嵌入结构光图像,并依据补色原理计算对应补色图像；连接刷新率为120Hz的投影仪,交替显示嵌入结构光后图像及补色图像。所有相机与显示节点连接同一信号发生器,相机拍摄与投影画面刷新动作保持同步。由于投影仪刷新率超过人眼感知阀值,视觉残留效果使得人眼难以感知到嵌入在投影画面中的结构光图像。 多投影显示系统安装完工后,使用投影仪作为光源,利用它投射网格到显示屏幕上来指定显示屏幕的全局纹理坐标；为保证多台投影仪投射出的画面在显示屏幕上构成均匀统一纹理坐标系,使用自由网格变形和多分辨率编辑技术,对投影仪输出画面的网格进行实时调整。系统运行时,主控节点控制所有相机连续拍摄两帧画面,拍摄得嵌入后画面及补色画面照片；分别为每个相机计算出嵌入的结构光图像,再拼接所有相机的计算结果；最后根据拼接结果实时检测投影仪位置是否变动。若检测到投影仪位置变动,显示节点在投影画面中嵌入规则网格顶点结构光图像；主控节点重复上述过程得到网格顶点图像拼接结果,并计算网格顶点的全局纹理坐标,网格内部点坐标通过对周围顶点纹理坐标进行重心插值方法计算得到；根据投影画面各像素点全局纹理坐标,实时计算投影校正参数,并将投影校正参数发送至所有显示节点。显示节点则根据投影校正参数对投影画面进行变形,完成投影重叠区域亮度衰减,实现投影画面的无缝拼接。 实验结果表明本文系统可实时完成自主投影校正。相比现有系统,本文系统不需大幅缩减投影画面动态范围,对投影画面影响小；投影校正过程无需中断正常显示输出黑屏或结构光图像,不要求投影画面中包含较多数量特征点。
[Abstract]:With the rapid development of projection display technology, in large-scale scientific computing visualization, military simulation, engineering design, exhibition industry and digital cinema and many other fields, multi-projection display system with high resolution, Large display size and strong immersion are widely used. The multi-projection display system allows the position of the projector to be not strictly neat and geometric distortion of the computer output image is carried out through the geometric correction process so that it can be displayed in the correct position of the screen after passing the projector optical system. The existing multi-projection system requires the projector not to be changed, otherwise it will affect the splicing effect and can not be applied to the working environment in which real-time tasks need to be performed. How to construct a multi-projection system with the ability of real-time autonomous projection correction becomes an important problem. In this paper, a set of multi-projection display system based on embedded structured light is presented, which has the ability of real-time independent projection correction. This system includes a master node and a plurality of display nodes. The main control node connects multiple cameras to shoot the projection screen in real time. Each display node embeds the structured light image by modifying the brightness value of the display screen pixel by pixel, and calculates the corresponding complementary color image according to the complementary color principle, and connects the projector with the refresh rate of 120Hz to alternately display the image after embedding the structured light and the complementary image. All cameras and display nodes are connected to the same signal generator, camera shooting and projection screen refresh actions remain synchronized. Because the refresh rate of the projector exceeds the human eye perception threshold, the visual residual effect makes it difficult for the human eye to perceive the structured light image embedded in the projected picture. After the installation of the multi-projection display system is completed, the projector is used as the light source, and it is used to project the mesh to the display screen to specify the global texture coordinates of the display screen. In order to ensure that the images projected by multiple projectors form a uniform texture coordinate system on the display screen, free mesh deformation and multi-resolution editing techniques are used to adjust the mesh of the projector's output screen in real time. When the system is running, the main control node controls all cameras to take two frames of pictures continuously, and then the embedded picture and the complementary picture are taken, respectively, the embedded structured light images are calculated for each camera, and then the calculation results of all cameras are spliced together. Finally, the position of the projector is detected in real time according to the splicing results. If the position change of the projector is detected, the display node embeds the structured light image of the regular mesh vertex in the projection screen. The master node repeats the above process to get the mesh vertex image splicing results and calculates the global texture coordinates of the mesh vertices. The interior point coordinates of the mesh are calculated by barycenter interpolation method to the surrounding vertex texture coordinates. According to the global texture coordinates of every pixel in the projection picture, the projection correction parameters are calculated in real time, and the projection correction parameters are sent to all display nodes. According to the projection correction parameters, the display node deforms the projection picture, and completes the brightness attenuation of the projection overlapping area, and realizes the seamless splicing of the projection picture. The experimental results show that the system can complete the automatic projection correction in real time. Compared with the existing system, this system does not need to greatly reduce the dynamic range of the projected picture, and has little impact on the projected picture. The projection correction process does not need to interrupt the normal output black screen or structured light image, and does not require the projection screen to contain a large number of feature points.
【学位授予单位】：复旦大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TP391.41
本文编号：2466134
[Abstract]:With the rapid development of projection display technology, in large-scale scientific computing visualization, military simulation, engineering design, exhibition industry and digital cinema and many other fields, multi-projection display system with high resolution, Large display size and strong immersion are widely used. The multi-projection display system allows the position of the projector to be not strictly neat and geometric distortion of the computer output image is carried out through the geometric correction process so that it can be displayed in the correct position of the screen after passing the projector optical system. The existing multi-projection system requires the projector not to be changed, otherwise it will affect the splicing effect and can not be applied to the working environment in which real-time tasks need to be performed. How to construct a multi-projection system with the ability of real-time autonomous projection correction becomes an important problem. In this paper, a set of multi-projection display system based on embedded structured light is presented, which has the ability of real-time independent projection correction. This system includes a master node and a plurality of display nodes. The main control node connects multiple cameras to shoot the projection screen in real time. Each display node embeds the structured light image by modifying the brightness value of the display screen pixel by pixel, and calculates the corresponding complementary color image according to the complementary color principle, and connects the projector with the refresh rate of 120Hz to alternately display the image after embedding the structured light and the complementary image. All cameras and display nodes are connected to the same signal generator, camera shooting and projection screen refresh actions remain synchronized. Because the refresh rate of the projector exceeds the human eye perception threshold, the visual residual effect makes it difficult for the human eye to perceive the structured light image embedded in the projected picture. After the installation of the multi-projection display system is completed, the projector is used as the light source, and it is used to project the mesh to the display screen to specify the global texture coordinates of the display screen. In order to ensure that the images projected by multiple projectors form a uniform texture coordinate system on the display screen, free mesh deformation and multi-resolution editing techniques are used to adjust the mesh of the projector's output screen in real time. When the system is running, the main control node controls all cameras to take two frames of pictures continuously, and then the embedded picture and the complementary picture are taken, respectively, the embedded structured light images are calculated for each camera, and then the calculation results of all cameras are spliced together. Finally, the position of the projector is detected in real time according to the splicing results. If the position change of the projector is detected, the display node embeds the structured light image of the regular mesh vertex in the projection screen. The master node repeats the above process to get the mesh vertex image splicing results and calculates the global texture coordinates of the mesh vertices. The interior point coordinates of the mesh are calculated by barycenter interpolation method to the surrounding vertex texture coordinates. According to the global texture coordinates of every pixel in the projection picture, the projection correction parameters are calculated in real time, and the projection correction parameters are sent to all display nodes. According to the projection correction parameters, the display node deforms the projection picture, and completes the brightness attenuation of the projection overlapping area, and realizes the seamless splicing of the projection picture. The experimental results show that the system can complete the automatic projection correction in real time. Compared with the existing system, this system does not need to greatly reduce the dynamic range of the projected picture, and has little impact on the projected picture. The projection correction process does not need to interrupt the normal output black screen or structured light image, and does not require the projection screen to contain a large number of feature points.
【学位授予单位】：复旦大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TP391.41
【参考文献】
相关期刊论文 前2条
1 宋荆洲;孙汉旭;施法中;贾庆轩;高欣;;多投影面沉浸式虚拟环境的快速构建方法[J];系统仿真学报;2006年11期
2 张号;贾庆轩;孙汉旭;高欣;阮瑞卿;;一种多通道曲面投影系统的几何校正方法[J];系统仿真学报;2006年S2期
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