典型文献
Optical flow-based method to estimate internal wave parameters from X-band marine radar images
文献摘要：
The velocity and direction of internal waves (IWs) are important parameters of the ocean, however, traditional observation methods can only obtain the average parameters of IWs for a single location or large area. Herein, a new method based on optical flow is proposed to derive the phase velocity vectors of IWs from X-band marine radar images. First, the X-band marine radar image sequence is averaged, and ramp correction is used to reduce the attenuation of gray values with increasing radial range. Second, the average propagation direction of the IWs is determined using the two-dimensional Fourier transform of the radar images; two radial profiles along this direction are selected from two adjacent radar images; and then, the average phase velocity of the IWs is estimated from these radial profiles. Third, the averaged radar images are processed via histogram equalization and binarization to reduce the influence of noise on the radar images. Fourth, a weighting factor is determined using the average phase velocity of a reference point; the phase velocities on the wave crest of the IWs are subsequently estimated via the optical flow method. Finally, the proposed method is validated using X-band marine radar image sequences observed on an oil platform in the South China Sea, and the error of the phase velocity is calculated to be 0.0003–0.0738 m/s. The application conditions of the proposed method are also discussed using two different types of IW packets.
文献关键词：
中图分类号：
作者姓名：
Jinghan Wen;Zhongbiao Chen;Yijun He
作者机构：
School of Marine Sciences,Nanjing University of Information Science&Technology,Nanjing 210044,China;Key Laboratory of Space Ocean Remote Sensing and Applications,National Satellite Ocean Application Service,Beijing 100081,China
文献出处：
引用格式：
[1]Jinghan Wen;Zhongbiao Chen;Yijun He-.Optical flow-based method to estimate internal wave parameters from X-band marine radar images)[J].海洋学报（英文版）,2022(09):149-157
A类：
IWs
B类：
Optical,flow,internal,parameters,from,band,marine,radar,images,velocity,direction,waves,important,ocean,however,traditional,observation,methods,can,only,obtain,single,location,large,area,Herein,new,optical,proposed,derive,phase,vectors,First,averaged,ramp,correction,used,reduce,attenuation,gray,values,increasing,radial,range,Second,propagation,determined,using,two,dimensional,Fourier,transform,profiles,along,this,selected,adjacent,then,estimated,these,Third,processed,via,histogram,equalization,binarization,influence,noise,Fourth,weighting,reference,point,velocities,crest,subsequently,Finally,validated,sequences,observed,oil,platform,South,China,Sea,error,calculated,be,application,conditions,also,discussed,different,types,packets
AB值：
0.447007
相似文献
机标中图分类号，由域田数据科技根据网络公开资料自动分析生成，仅供学习研究参考。
