| 1 | Fusion of SAR and Optical Image for Sea Ice Extraction显示文摘It is difficult to balance local details and global distribution using a single source image in marine target detection of a large scene.To solve this problem,a technique based on the fusion of optical image and synthetic aperture radar(SAR)image for the extraction of sea ice is proposed in this paper.The Band 2(B2 image of Sentinel-2(S2 in the research area is selected as optical image data.Preprocessing on the optical image,such as resampling,projection transformation and format conversion,are conducted to the S2 dataset before fusion.Imaging characteristics of the sea ice have been analyzed,and a new deep learning(DL)model,OceanTDL5,is built to detect sea ices.The fusion of the Sentinel-1(S1 and S2 images is realized by solving the optimal pixel values based on deriving Poisson Equation.The experimental results indicate that the use of a fused image improves the accuracy of sea ice detection compared with the use of a single data source.The fused image has richer spatial details and a clearer texture compared with the original optical image,and its material sense and color are more abundant. | LI Wanwu LIU Lin ZHANG Jixian | 2021 | Journal of Ocean University of China2021，20，6： | 0 |
| 2 | Parallel Extraction of Marine Targets Applying OIDA Architecture显示文摘Computing resources are one of the key factors restricting the extraction of marine targets by using deep learning.In order to increase computing speed and shorten the computing time,parallel distributed architecture is adopted to extract marine targets.The advantages of two distributed architectures,Parameter Server and Ring-allreduce architecture,are combined to design a parallel distributed architecture suitable for deep learning–Optimal Interleaved Distributed Architecture(OIDA).Three marine target extraction methods including OTD_StErf,OTD_Loglogistic and OTD_Sgmloglog are used to test OIDA,and a total of 18 experiments in 3categories are carried out.The results show that OIDA architecture can meet the timeliness requirements of marine target extraction.The average speed of target parallel extraction with single-machine 8-core CPU is 5.75 times faster than that of single-machine single-core CPU,and the average speed with 5-machine 40-core CPU is 20.75 times faster. | LIU Lin LI Wanwu ZHANG Jixian SUN Yi CUI Yumeng | 2022 | Journal of Ocean University of China2022，21，3： | 0 |
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