基于B样条曲线的投影图像颜色校正方法  

COLOR CORRECTION METHOD OF PROJECTION IMAGE 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,Hebei,China;Qinhuangdao Audio Visual Machinery Research Institute,Qinhuangdao 066004,Hebei,China;Shenyang Academy of Instrumentation Science Co.,Ltd.,Shenyang 110000,Liaoning,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]沈阳仪表科学研究院,辽宁沈阳110000

出　　处：《计算机应用与软件》2022年第6期210-214,220,共6页Computer Applications and Software

基　　金：河北省科技支撑计划科技冬奥专项(19975707D)。

摘　　要：针对基于摄像机反馈的投影图像颜色校正结果误差较大的问题,提出B样条曲线与分段贝塞尔曲线相融合求取投影图像颜色传递函数的方案。通过摄像机来记录RGB空间每个通道不同强度值所对应的投影画面颜色强度值;根据这些节点利用B样条曲线求取颜色传递函数;利用分段贝塞尔曲线对颜色传递函数进行优化来补偿校正不精确的复杂区域造成的偏差。实验表明,双通道投影显示图像经B样条曲线颜色校正后,颜色强度的最大差异降低至原来的31.4%,再经分段贝塞尔曲线颜色补偿后,颜色强度的最大差异降低至未补偿时的45.5%。The color correction of projection image based on camera feedback has large error.Therefore,we put forward a scheme to obtain color transfer function of projection image by combining B-spline curve and segmented Bezier curve.We recorded the color intensity of projection image corresponding to different intensity of each channel in RGB space by camera.According to these nodes,B-spline curve was used to calculate the color transfer function.The color transfer function was optimized by the segmented Bezier curve to compensate for the errors caused by the inaccurate correction in complex areas.The experimental results show that after the double-channel projection display image is corrected by the B-spline curve,the maximum difference in color intensity is reduced to 31.4%.Through the color compensation by the segmented Bezier curve,the maximum difference in color intensity is reduced to 45.5%.

关 键 词：投影图像 摄像机 颜色校正 B样条曲线 分段贝塞尔曲线 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]