基于B样条曲线的投影图像边缘融合方法  

Projection image edge fusion method based on B-spline curve

作　　者：宋涛[1,2,3] 祁继辉 侯培国 赵明宇[2] 李坤 SONG Tao;QI Jihui;HOU Peiguo;ZHAO Mingyu;LI Kun(College of Electrical Engineering,Yanshan University,Qinhuangdao 066004,China;Qinhuangdao Audio Visual Machinery Research Institute,Qinhuangdao 066004,China;Key Laboratory of Digital Imaging Equipment and Digital Display Technology in Hebei Province,Qinhuangdao 066004,China)

机构地区：[1]燕山大学电气工程学院,河北秦皇岛066004 [2]秦皇岛视听机械研究所,河北秦皇岛066004 [3]河北省数字影像装备与数字显示技术重点实验室,河北秦皇岛066004

出　　处：《应用光学》2021年第6期1040-1047,共8页Journal of Applied Optics

基　　金：河北省科技支撑计划科技冬奥专项项目(19975707D)。

摘　　要：为了实现对多通道投影画面重叠区域亮度的准确调节,设计了基于B样条曲线的投影图像边缘融合方法。首先,根据投影幕、外界光照环境以及投影仪自身性质设定衰减函数与伽玛校正的参数。接着,通过摄像机采集投影画面的重叠区域并计算每个像素点的颜色强度,通过理想值计算峰值信噪比。然后,比较二次B样条曲线与三次B样条曲线的校正精度与灵活度。最后,通过三次B样条曲线对投影图像进行边缘亮度优化直到峰值信噪比达到标准值为止。实验结果表明:投影画面重叠区域的R通道经B样条曲线优化后峰值信噪比提升了9.13 dB,G通道峰值信噪比提升了6.09 dB,B通道峰值信噪比提升了7.53 dB。基于B样条曲线的投影图像边缘亮度优化技术提高了投影画面重叠区域亮度调节的准确度。In order to accurately adjust the brightness of the overlapping area of multi-channel projection images,a projection image edge fusion method based on B-spline curve was designed.Firstly,the parameters of attenuation function and gamma correction were set according to the projection screen,external light environment and the nature of the projector itself.Then,the overlap area of the projection image was acquired by the camera and the color intensity of each pixel was calculated,and the peak signal-to-noise ratio was calculated by the ideal value.Then,the correction accuracy and flexibility of quadratic B-spline curve and cubic B-spline curve were compared.Finally,the edge brightness of the projection image was optimized by cubic B-spline until the peak signal-to-noise ratio reached the standard value.The experimental results show that the peak signal-to-noise ratio of the channel R in the overlapped area of the projection image is increased by 9.13 dB,that of the channel G by 6.09 dB,and that of the channel B by 7.53 dB.The edge brightness optimization technology of projection image based on B-spline curve improves the accuracy of brightness adjustment in overlapping area of projection image.

关 键 词：多通道投影系统 边缘亮度融合 伽玛校正 B样条曲线 峰值信噪比 

分 类 号：TN919.8[电子电信—通信与信息系统]