基于平场定标的彩色高动态范围图像非均匀校正  

Nonuniformity correction of color high dynamic range images based on flat field calibration

作　　者：谢蓄芬[1,2] 尚颖英 廖宁放 XIE Xufen;SHANG Yingying;LIAO Ningfang(School of Information Science and Engineering, Dalian Polytechnic University, Dalian 116034, China;School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China)

机构地区：[1]大连工业大学信息科学与工程学院,辽宁大连116034 [2]北京理工大学光电学院,北京100081

出　　处：《大连工业大学学报》2021年第5期377-381,共5页Journal of Dalian Polytechnic University

基　　金：国家自然科学基金项目(61975012);辽宁省自然科学基金引导项目(2019-ZD-0292).

摘　　要：彩色成像系统响应的非线性导致了高动态范围彩色图像与系统平场图像不能匹配,给高动态范围图像的非均匀校正带来了困难。通过不同F数和不同积分时间的多点平场辐射定标实验,标定系统RGB三通道的相对响应曲线;对高动态范围场景通过多积分时间成像,应用三通道的相对响应曲线对其进行线性化,融合生成高动态范围彩色图像;引入对应F数下的线性化平场图像对生成的高动态范围彩色图像进行两点法校正。应用夜晚路灯照明场景进行了实验验证,结果表明校正前后三通道高动态范围图像的粗糙度平均增大6.81%,统计F比平均减小9.87%。Due to the nonlinear response of color image systems,the high dynamic range(HDR)color image is not matched with the system’s flat field images,which makes it difficult to correct the response nonuniformity of HDR image.The relative response curve of RGB three-channel of the system was first calibrated by multi-point flat field radiation calibration experiments with different F number and different integration time.HDR images were generated by multi-integral time image sequence for HDR scenes,these images linearized by the relative response curve of the three channels.HDR color images were generated by fusion.Finally,the flat field image corresponding to F number was used to correct the color HDR image by two-point method.The method was verified by a night street lighting scene.The experimental results showed that the roughness of the HDR image increased by 6.81%and the statistical F ratio decreased by 9.87%on average after nonuniformity correction.

关 键 词：彩色高动态范围图像 系统响应非均匀性 平场定标 非均匀校正 

分 类 号：TP751[自动化与计算机技术—检测技术与自动化装置]