Lab的多投影颜色校正及亮度融合技术  

Multi-projection color correction and brightness fusion technology based on Lab

作　　者：侯培国[1,2] 张铮 宋涛 祁继辉[1,2] HOU Pei-guo;ZHANG Zheng;SONG Tao;QI Ji-hui(School of electrical engineering,Yanshan university,Qinhuangdao 066004,China;Key Laboratory of digital imaging equipment and digital display technology in Hebei Province,Qinhuangdao 066004,China;Qinhuangdao Audio-visual 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]秦皇岛视听机械研究所,河北秦皇岛066004

出　　处：《光学精密工程》2021年第7期1667-1677,共11页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.62033011);河北省技术创新引导计划科技冬奥专项(No.19975707D)。

摘　　要：传统的多投影颜色校正和亮度融合在RGB颜色空间下进行,存在校正过程中亮度和色度相互干扰的问题。针对上述问题,提出一种基于Lab颜色空间的颜色校正和亮度融合方法。将亮度与色度单独提取出来,用B样条曲线模型建立起各投影仪原图像与投影显示画面的亮度、色度转换关系,以消除各投影仪投影显示画面之间的颜色差异,并采用融合B样条曲线的伽玛校正对画面重叠区域的亮度进行调节。实验结果表明,相对于RGB颜色空间,在Lab空间进行颜色校正使两个投影显示画面的颜色强度差异在Lab三通道分别减少了4.14,2.41,2.44;相对于RGB颜色空间的伽马校正,在Lab空间将伽马校正与B样条曲线融合进行亮度调节使投影显示画面重叠区域与非重叠区域的颜色强度差异在Lab三通道分别减少了6.12,4.64,3.47。基于Lab的多投影颜色校正及亮度融合技术可对投影显示画面亮度与色度进行更准确的校正,并且给予不同颜色强度对应的伽马系数。The traditional multi-projection color correction and brightness fusion are performed in the RGB color space;the brightness and chroma interfere with each other in the correction process,which is a major concern. To solve this problem,a color correction and brightness fusion method based on the Lab color space is proposed. The brightness and chroma are extracted separately,and the brightness and chroma conversion relationship between the original images of each projector and the projected display screen is established using the B-spline curve model to eliminate the color difference between the display screen of each projector,and the brightness of the overlapping area of the screen is adjusted using the gamma correction fused with the B-spline curve. The experimental results show that,compared with the RGB color space,color correction in the Lab color space reduces the difference in color intensity of the two projection display images by 4. 14,2. 41,and 2. 44 in Lab three channels. Compared with gamma correction in the RGB color space,gamma correction and B-spline curve are fused to adjust brightness in Lab space,which reduces the difference in color intensity between the overlapping and non-overlapping areas by 6. 12,4. 64,and 3. 47 in Lab three channels. The multi-projection color correction and brightness fusion technology based on Lab can correct the brightness and chroma of the projected display image more accurately,and obtain the gamma coefficient corresponding to different color intensities.

关 键 词：Lab颜色空间 颜色校正 亮度融合 伽马校正 B样条曲线 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]