针对遥感建筑物图像中建筑物大小不一、边缘模糊导致精度不高的问题,提出一种双分支并行融合注意力机制的网络模型TC-UNet++。针对卷积神经网络擅长提取局部特征,难以捕获全局信息的特点,引入Transformer结构以解决全局信息丢失的问题...针对遥感建筑物图像中建筑物大小不一、边缘模糊导致精度不高的问题,提出一种双分支并行融合注意力机制的网络模型TC-UNet++。针对卷积神经网络擅长提取局部特征,难以捕获全局信息的特点,引入Transformer结构以解决全局信息丢失的问题。对于两种结构的特征维度和通道数不匹配的问题,设计一种TC(Transformer to CNN)模块以交互的方式融合不同分辨率下局部与全局特征。引入坐标注意力机制,根据像素在图像中的位置信息,定位和识别建筑物。实验结果表明,TC-UNet++在WHU数据集上交互比、准确率、总精度分别达到了93.1%、95.9%、98.8%,在不显著增加参数的情况下,展现出良好的有效性。展开更多
A D-shaped fiber is coated with a new two-dimensional nanomaterial,violet phosphorus(VP),to create a saturable absorber(SA)with a modulation depth of 3.68%.Subsequently,the SA is inserted into a fiber laser,enabling s...A D-shaped fiber is coated with a new two-dimensional nanomaterial,violet phosphorus(VP),to create a saturable absorber(SA)with a modulation depth of 3.68%.Subsequently,the SA is inserted into a fiber laser,enabling successful generation of dark solitons and bright–dark soliton pairs through adjustment of the polarization state within the cavity.Through further study,mode-locked pulses are achieved,proving the existence of polarization-locked vector solitons.The results indicate that VP can be used as a polarization-independent SA.展开更多
文摘针对遥感建筑物图像中建筑物大小不一、边缘模糊导致精度不高的问题,提出一种双分支并行融合注意力机制的网络模型TC-UNet++。针对卷积神经网络擅长提取局部特征,难以捕获全局信息的特点,引入Transformer结构以解决全局信息丢失的问题。对于两种结构的特征维度和通道数不匹配的问题,设计一种TC(Transformer to CNN)模块以交互的方式融合不同分辨率下局部与全局特征。引入坐标注意力机制,根据像素在图像中的位置信息,定位和识别建筑物。实验结果表明,TC-UNet++在WHU数据集上交互比、准确率、总精度分别达到了93.1%、95.9%、98.8%,在不显著增加参数的情况下,展现出良好的有效性。
基金supported by the National Natural Science Foundation of China(Grant Nos.62005212 and 12075190)the Young Talent Fund of University Association for Science and Technology in Shaanxi,China(Grant No.20210112)+2 种基金the New Star Project of Science and Technology of Shaanxi Province(Grant No.2022KJXX-69),the Fund for Outstanding Young Talents of China Academy of Space Technology(Xi’an)(Grant No.Y21-RCFYJQ1-03)the Young Elite Scientists Sponsorship Program by CAST(Grant No.2022QNRC001)the Open Foundation of State Key Laboratory of Transient Optics and Photonics(Grant No.SKLST202207).
文摘A D-shaped fiber is coated with a new two-dimensional nanomaterial,violet phosphorus(VP),to create a saturable absorber(SA)with a modulation depth of 3.68%.Subsequently,the SA is inserted into a fiber laser,enabling successful generation of dark solitons and bright–dark soliton pairs through adjustment of the polarization state within the cavity.Through further study,mode-locked pulses are achieved,proving the existence of polarization-locked vector solitons.The results indicate that VP can be used as a polarization-independent SA.
