This letter delnonstrates the structure of the passive radar using TV signals. Because the TV signal is a kind of pseudoperiodic signal, the matched filtering of color TV signals would yield high sidelobes which cause...This letter delnonstrates the structure of the passive radar using TV signals. Because the TV signal is a kind of pseudoperiodic signal, the matched filtering of color TV signals would yield high sidelobes which cause the range ambiguity. To overcome this problem, the mismatched filter is proposed to suppress the correlation sidelobcs of matched filtering of TV signals. By utilizing the iteration process, this method could achieve the required peak sidclobc level. The impacts of the noise and target movement on mismatched filtering are also analysed, Simulation results are included to demonstrate the effectiveness of the proposed technique.展开更多
Principles of color space generation for multizone optical registration systems are presented;conformity between different color spaces is defined;algo- rithms of the multizone image registrator signal processing and ...Principles of color space generation for multizone optical registration systems are presented;conformity between different color spaces is defined;algo- rithms of the multizone image registrator signal processing and a generalized algo- rithm for analysis are given.Procedures are discussed for plotting the color spaces that are used in the analysis of the Earth and other planets.It is shown that estimates made in such spaces are interrelated and that spectral reflections of objects under study should be available in order to compare—in terms of color discrimination- several automatic recorders with different spectral sensitivities.Examples are given to illustrate color spaces having such properties.Circuits of chromaticity filters are also presented.展开更多
针对海洋牧场观测视频色彩失真和鱼类传统识别方法准确率低的问题,提出一种基于Faster-RCNN的海洋牧场鱼类识别与分类方法。首先,由于海水环境的特殊性和复杂性导致观测视频图像品质差,采用SDI(Serial Digital Interface)信号色彩补偿...针对海洋牧场观测视频色彩失真和鱼类传统识别方法准确率低的问题,提出一种基于Faster-RCNN的海洋牧场鱼类识别与分类方法。首先,由于海水环境的特殊性和复杂性导致观测视频图像品质差,采用SDI(Serial Digital Interface)信号色彩补偿系统来提高视频品质以此制作不同质量数据集;然后以Faster-RCNN为深度学习模型并提出优化特征提取网络与区域建议网络(RPN)来实现海洋牧场鱼类识别与分类。实验结果表明,该方法平均精度均值(Mean Average Precision,mAP)达到81.63%,与传统机器学习目标检测算法相比,显著提高了识别的准确率。展开更多
文摘This letter delnonstrates the structure of the passive radar using TV signals. Because the TV signal is a kind of pseudoperiodic signal, the matched filtering of color TV signals would yield high sidelobes which cause the range ambiguity. To overcome this problem, the mismatched filter is proposed to suppress the correlation sidelobcs of matched filtering of TV signals. By utilizing the iteration process, this method could achieve the required peak sidclobc level. The impacts of the noise and target movement on mismatched filtering are also analysed, Simulation results are included to demonstrate the effectiveness of the proposed technique.
文摘Principles of color space generation for multizone optical registration systems are presented;conformity between different color spaces is defined;algo- rithms of the multizone image registrator signal processing and a generalized algo- rithm for analysis are given.Procedures are discussed for plotting the color spaces that are used in the analysis of the Earth and other planets.It is shown that estimates made in such spaces are interrelated and that spectral reflections of objects under study should be available in order to compare—in terms of color discrimination- several automatic recorders with different spectral sensitivities.Examples are given to illustrate color spaces having such properties.Circuits of chromaticity filters are also presented.
文摘针对海洋牧场观测视频色彩失真和鱼类传统识别方法准确率低的问题,提出一种基于Faster-RCNN的海洋牧场鱼类识别与分类方法。首先,由于海水环境的特殊性和复杂性导致观测视频图像品质差,采用SDI(Serial Digital Interface)信号色彩补偿系统来提高视频品质以此制作不同质量数据集;然后以Faster-RCNN为深度学习模型并提出优化特征提取网络与区域建议网络(RPN)来实现海洋牧场鱼类识别与分类。实验结果表明,该方法平均精度均值(Mean Average Precision,mAP)达到81.63%,与传统机器学习目标检测算法相比,显著提高了识别的准确率。
