摘要
Mask匀光算法在光学遥感影像色彩一致性处理中广泛应用。针对传统算法存在滤波器参数确定自适应性差、影像存在反差不一致现象、影像细节信息易损失等缺陷,提出改进算法。该算法结合影像信息与最优化准则自适应确定滤波器参数,对背景进行动态压缩以减小细节信息丢失,自适应调整拉伸参数,解决反差分布不一致现象。对比试验显示,改进算法处理的影像在光照一致性、影像清晰度、反差一致性上均取得较为理想的匀光效果。
Mask dodging algorithm is widely used in color consistency processing of remote sensing imagery.However,the traditional algorithm is deficient in some respects,such as the selection of filter parameters is short of adaptability,image contrast phenomenon exists inconsistency,and image detail information is easy to lost.An improved algorithm is proposed in order to solve these problems.The filter parameters are adaptively selected according to the image information and optimization criteria;the background image is dynamically compressed to reduce the loss of details;the stretching parameters are adjusted adaptively to solve the inconsistency in image contrast.Comparative experiments show that the improved algorithm achieves more satisfactory dodging effect on illumination uniformity,image clarity and contrast consistency.
引文
[1]李治江.彩色影像色调重建的理论与实践[D].武汉:武汉大学,2005.
[2]程培英,沈会良.一种光照不均匀遥感影像的恢复增强方法[J].计算机应用与软件,2008,25(10):52-54.
[3]王密,潘俊.一种数字航空影像的匀光方法[J].中国图像图形学报,2004,9(6):744-748.
[4]NNOLIMU,LEE P.Homomorphic filtering of colour images using a spatial filter kernel in the HIS colour space[C]∥IEEE International Instrumentation and Measurement Technology Conference,2008.
[5]ORSINIG,RAMPONI Q,CARRAI P,et al.A modified retinex for image contrast enhancement and dynamics control[C]∥2003International Conference on Image Processing,Barcelona,Spain.3:393-396.
[6]易磊.遥感影像色彩一致性处理技术研究[D].郑州:信息工程大学,2015.
[7]周丽雅,秦志远,尚炜,等.反差一致性保持的影像匀光算法[J].测绘科学技术学报,2011,28(11):46-49.
[8]张振.光学遥感影像匀光算法研究[D].郑州:信息工程大学,2010.
[9]朱述龙,张振,朱宝山,等.遥感影像亮度和反差分布不均匀性校正算法的效果比较[J].遥感学报,2011,15(1):111-122.
[10]姚芳,万幼川,胡晗.基于Mask原理的改进匀光算法研究[J].遥感信息,2013,28(3):8-13.
[11]袁修孝,韩宇韬,方毅.改进的航摄影像Mask匀光算法[J].遥感学报,2014,18(3):630-641.
[12]孙文,尤红建,傅兴玉,等.基于非线性MASK的遥感影像匀光算法[J].测绘科学,2014,39(9):130-134.
[13]张庆闯.面向航空影像匀光的改进马斯克法[J].测绘科学,2015,40(5):122-124.
[14]吴磊,康一飞,李娜娜,等.大面积含云卫星遥感影像匀光算法的改进[J].地理空间信息,2016,14(1):41-43.