基于二维切片的同态滤波实现三维图像增强
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摘要
为完善基于距离能量原理的激光三维重建技术得到的三维图像的细节信息,采用同态滤波法对二维切片序列滤波,滤除由于激光照明不均匀、大气散射和环境背景引起的噪声。首先,采用指数型高通同态滤波器、二阶巴特沃斯型高通同态滤波器和高斯型高通同态滤波器三种滤波器分别对二维切片序列进行处理,并将三维重建的结果与未经同态滤波的三维重建结果进行对比。最后,采用提取图像中特定位置的像素信息进行具体的分析与评价。实验结果表明,同态滤波可以有效消除噪声,提升三维图像细节信息的质量。
In order to complete details in the method of 3D range-gated imaging based on the rangeintensity profiles(RIP),we applied homomorphic filtering to 2D serial images in succession.This application filtered noise disturbance from low laser illuminating homogeneity,atmospheric scattering and ambient background.First,2D serial images are filtered by EHPF,BHPF and GHPF,respectively,and three 3D images were reconstructed by RIP correlation algorithm at the same time.And then compare three3D images under homomorphic filtering and 3D image reconstructed by raw 2D serial images.At last,we analyzed and evaluated gray levels in specific regions,which were extracted from 2D serial images and 3D images,correspondingly.The experiments results show that homomorphic filtering is effective in noise elimination and improvement in completing details in 3D images.
In order to complete details in the method of 3D range-gated imaging based on the rangeintensity profiles(RIP),we applied homomorphic filtering to 2D serial images in succession.This application filtered noise disturbance from low laser illuminating homogeneity,atmospheric scattering and ambient background.First,2D serial images are filtered by EHPF,BHPF and GHPF,respectively,and three 3D images were reconstructed by RIP correlation algorithm at the same time.And then compare three3D images under homomorphic filtering and 3D image reconstructed by raw 2D serial images.At last,we analyzed and evaluated gray levels in specific regions,which were extracted from 2D serial images and 3D images,correspondingly.The experiments results show that homomorphic filtering is effective in noise elimination and improvement in completing details in 3D images.
引文
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[11]GUO Huichao,SUN Huayan,WANG Shuai Wang,et al.Study on super-resolution three-dimensional range-gated imaging technology[C]//Ninth International Conference on Graphic and Image Processing.2018:10615.
[12]WANG Xinwei,LI Youfu,ZHOU Yan.Triangular-range-intensity profile spatial-correlation method for 3D super-resolution range-gated imaging[J].Appl Opt,2013,52(30):7399-7406.
[2]ZHANG Xiuda,YAN Huimin.Three-dimensional active imaging with maximum depth range[J].Applied optics,2011,50(12):1682.
[3]WANG Xinwei,CAO Yinan,CUI Wei,et al.Three-dimensional range-gated flash LIDAR for land surface remote sensing[J].Proceedings of SPIE-The International Society for Optical Engineering,2014,9260:92604L-92604L-10.
[4]张毅,闫利.地面激光点云强度噪声的三维扩散滤波方法研究[J].测绘学报,2013,42(4):568-573.
[5]李自勤,李琦,王骐.由统计特性分析激光主动成像系统图像的噪声性质[J].中国激光,2004,31(9).
[6]张荆沙,张琰.激光主动成像散斑抑制系统设计[J].激光杂志,2017(8):71-75.
[7]MONNIN D,SCHNEIDER AL,CHRISTNACHER F,et al.A 3D Outdoor Scene Scanner Based on a Night-Vision Range-Gated Active Imaging System[C]//International Symposium on 3d Data Processing.IEEE,2006.
[8]HUANG Hantao,WANG Xinwei,ZHOU Yan,et al.3D super resolution range-gated imaging for canopy reconstruction and measurement[C]//2017 International Conference on Optical Instruments and Technology:Beijing,China.2018:10620.
[9]梁琳,何卫平,雷蕾,等.光照不均图像增强方法综述[J].计算机应用研究,2010,27(5):1625-1628.
[10]陈春宁,王延杰.在频域中利用同态滤波增强图像对比度[J].微计算机信息,2007,23(6):264-266.
[11]GUO Huichao,SUN Huayan,WANG Shuai Wang,et al.Study on super-resolution three-dimensional range-gated imaging technology[C]//Ninth International Conference on Graphic and Image Processing.2018:10615.
[12]WANG Xinwei,LI Youfu,ZHOU Yan.Triangular-range-intensity profile spatial-correlation method for 3D super-resolution range-gated imaging[J].Appl Opt,2013,52(30):7399-7406.