基于自由变形技术的多投影颜色校正  

Multi-projection color correction based on free-form deformation technology

作　　者：侯培国[1,2] 高艳菲 宋涛 祁继辉[1,2] HOU Peiguo;GAO Yanfei;SONG Tao;QI Jihui(School of Electrical Engineering,Yanshan University,Qinhuangdao 066004,China;Hebei Key Laboratory of Digital Image Equipment and Digital Display Technology,Qinhuangdao 066004,China;Qinhuangdao Audition Machinery Research Institute,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]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 [3]秦皇岛试听机械研究所,河北秦皇岛066004

出　　处：《应用光学》2023年第4期748-755,共8页Journal of Applied Optics

基　　金：国家自然科学基金(62033011);河北省技术创新引导计划科技冬奥会专项(19975707D)。

摘　　要：为了解决多通道投影显示系统中各投影仪投影画面之间颜色不一致的问题,设计了一种基于自由变形技术的多投影颜色校正方法。首先,通过Bernstein基函数建立自由变形技术模型,建立各投影仪原始图像和摄像机拍摄图像之间的颜色转换关系;其次,采集原始图像集和摄像机拍摄的投影显示画面集,确定自由变形技术模型的参数;然后,通过Matlab分析验证投影图像各颜色通道之间是相互影响的;最后,对原始图像进行颜色扭曲,将本文颜色校正方法与传统方法进行直方图相似性评估对比。实验结果表明:对比广义颜色校正方法和基于B样条曲线的颜色校正方法,本文方法将投影画面的颜色强度平均差值在B通道减少了2.50,在G通道减少了2.34,在R通道减少了3.57,直方图的相关性提高了8.9%,巴氏距离降低了9.7%。基于自由变形技术的多投影颜色校正方法使投影画面衔接流畅,给用户带来更好的沉浸感受。In order to solve the problem of color inconsistency between the projection pictures of various projectors in a multi-channel projection display system,a multi-projection color correction method based on free-form deformation technology was designed.Firstly,the free-form deformation model was established by Bernstein basis function,and the color conversion relationship between the original image of each projector and the image taken by the camera was established.Then,collected the original image set and the projection display picture set taken by the camera to determine the parameters of the free-form deformation technology model.Moreover,through Matlab analysis,it was verified that each color channel of projection image was affected by each other.Finally,the original image was color distorted,and the proposed color correction method was compared with the traditional method for histogram similarity evaluation.The experimental results show that,compared with the generalized color correction method and the color correction method based on B-spline curve,the proposed method reduces the average difference of color intensity of the projected image by 2.50 in the B channel,2.34 in the G channel,and 3.57 in the R channel.The correlation of histogram is increased by 8.9%,and the Pap distance is reduced by 9.7%.The multi-projection color correction method based on free-form deformation makes the projection images smoothly connected,and brings the user a better immersion experience.

关 键 词：多通道投影系统 颜色校正 自由变形技术 BERNSTEIN基函数 

分 类 号：TN919[电子电信—通信与信息系统]