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Study on Variable Step Size Blind Equalization Algorithm Based on CMA 基于CMA的变步长盲均衡算法研究
Mingyu Yang, Dongming Xu
The inter-symbol interference caused by channel distortion in the communication process seriously affects the communication quality, and this problem is often solved by equalization technology. The principle of the traditional blind equalization constant modulus algorithm (CMA) with fixed step is introduced, and the problem of fast convergence speed and small steady-state error is analyzed by simulation. In order to solve this problem, a blind equalization algorithm with variable step size based on CMA is proposed. In order to solve the problem of fast convergence speed and small steady-state error, the CMA algorithm is improved and the principle of the improved algorithm is described, and the influence of the step on the performance of the algorithm is analyzed. Finally, the simulation experiment proves that the improved algorithm can speed up the convergence speed and keep a small steady-state error at the same time.
在通信过程中,由于信道失真引起的码间干扰严重影响通信质量,这一问题往往通过均衡技术来解决。介绍了传统固定步长盲均衡恒模算法的原理,并通过仿真分析了该算法收敛速度快、稳态误差小的问题。为了解决这一问题,提出了一种基于CMA的变步长盲均衡算法。为了解决CMA算法收敛速度快、稳态误差小的问题,对CMA算法进行了改进,阐述了改进算法的原理,并分析了步长对算法性能的影响。最后通过仿真实验证明,改进算法在加快收敛速度的同时保持较小的稳态误差。
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引用次数: 0
SN-YOLO: Improved YOLOv5 with Softer-NMS and SIOU for Object Detection SN-YOLO:改进的YOLOv5与soft - nms和SIOU的目标检测
Wanyu Deng, Zhen Wang
As a lightweight target detection network, YOLOv5 is popular in the industry for its advantages of fast speed and small model, but the detection accuracy is not very high. In response to this problem, we propose an improved model SN-YOLO based on YOLOv5. First, we introduce Softer-NMS as the post-processing method of the model, which will make the prediction box more accurate. Secondly, we improved the loss function of the original algorithm and introduced the SIOU loss function to optimize the model and improve the accuracy of the algorithm. Finally, in order to improve the feature extraction ability of the backbone, we implanted the CBAM (Convolutional block attention module) module into the algorithm. We validate the model using the 2007 and 2012 datasets of PASCAL VOC. The experimental results show that SN-YOLO has a great improvement over the original model in all aspects. The effectiveness of the algorithm is verified.
YOLOv5作为一种轻量级的目标检测网络,以其速度快、模型小等优点受到业界的青睐,但检测精度不是很高。针对这一问题,我们提出了基于YOLOv5的改进模型SN-YOLO。首先,我们引入了soft - nms作为模型的后处理方法,使预测框更加准确。其次,对原算法的损失函数进行改进,引入SIOU损失函数对模型进行优化,提高算法的精度。最后,为了提高主干的特征提取能力,我们在算法中植入了CBAM (Convolutional block attention module)模块。我们使用PASCAL VOC的2007年和2012年数据集验证了该模型。实验结果表明,SN-YOLO在各方面都比原模型有很大的改进。验证了该算法的有效性。
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引用次数: 0
Joint Multi-Scale Residual and Motion Feature Learning for Action Recognition 联合多尺度残差和运动特征学习用于动作识别
Linfeng Yang, Zhixiang Zhu, Chenwu Wang, Pei Wang, Shaobo Hei
For action recognition, two-stream networks consisting of RGB and optical flow has been widely used, showing high recognition accuracy. However, optical flow computation is time-consuming and requires a large amount of storage space, and the recognition efficiency is very low. To alleviate this problem, we propose an Adaptive Multi-Scale Residual (AMSR) module and a Long Short Term Motion Squeeze (LSMS) module, which are inserted into the 2D convolutional neural network to improve the accuracy of action recognition and achieve a balance of accuracy and speed. The AMSR module adaptively fuses multi-scale feature maps to fully utilize the semantic information provided by deep feature maps and the detailed information provided by shallow feature maps. The LSMS module is a learnable lightweight motion feature extractor for learning long-term motion features of adjacent and non-adjacent frames, thus replacing the traditional optical flow and improving the accuracy of action recognition. Experimental results on UCF-101 and HMDB-51 datasets demonstrate that the method proposed in this paper achieves competitive performance compared to state-of-the-art methods with only a small increase in parameters and computational cost.
在动作识别方面,由RGB和光流组成的两流网络得到了广泛的应用,具有较高的识别精度。但是,光流计算耗时长,需要大量的存储空间,识别效率很低。为了解决这一问题,我们提出了一个自适应多尺度残差(AMSR)模块和一个长短期运动挤压(LSMS)模块,将其插入到二维卷积神经网络中,以提高动作识别的精度,实现精度和速度的平衡。AMSR模块自适应融合多尺度特征图,充分利用深层特征图提供的语义信息和浅层特征图提供的详细信息。LSMS模块是一种可学习的轻量级运动特征提取器,用于学习相邻帧和非相邻帧的长期运动特征,从而取代传统的光流,提高动作识别的准确性。在UCF-101和HMDB-51数据集上的实验结果表明,本文提出的方法与现有方法相比具有竞争力,且参数和计算成本仅略有增加。
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引用次数: 0
A Novel Face Forgery Detection Method Based on Augmented Dual-Stream Networks 一种基于增强双流网络的人脸伪造检测方法
Yumei Liu, Yong Zhang, Weiran Liu
The current face forgery methods based on deep learning are becoming more mature and abundant, and existing detection techniques have some limitations and applicability issues that make it difficult to effectively detect such behaviour. In this paper, we propose an enhanced dual-stream FC_2_stream network model based on dual-stream networks to detect forged regions in manipulated face images through end-to-end training of the images. The RGB stream is used to extract features from the RGB image to find the forged traces; the noise stream uses the filtering layer of the SRM (Steganalysis Rich Model) model to extract the noise features and find the inconsistency between the noise in the real region and the forged region in the fake face, then the features of the two streams are fused with a bilinear pooling layer to predict the forged region, and finally the forged region is determined by whether the blending boundary of the forged image is displayed to determine the image authenticity. Experiments conducted on four benchmark datasets show that our model is still effective against forgeries generated by unknown face manipulation methods, and also demonstrate the superior generalisation capability of our model.
目前基于深度学习的人脸伪造方法日趋成熟和丰富,现有的检测技术存在一定的局限性和适用性问题,难以有效检测出人脸伪造行为。在本文中,我们提出了一种基于双流网络的增强双流FC_2_stream网络模型,通过对被操纵的人脸图像进行端到端训练来检测伪造区域。利用RGB流从RGB图像中提取特征,查找伪造痕迹;噪声流使用SRM (Steganalysis Rich Model)模型的滤波层提取噪声特征,发现假人脸真实区域和伪造区域的噪声不一致,然后用双线性池化层将两流特征融合预测伪造区域,最后通过伪造图像的混合边界是否显示来确定伪造区域,以确定图像的真实性。在四个基准数据集上进行的实验表明,我们的模型仍然有效地对抗未知人脸操纵方法产生的伪造,并且也证明了我们的模型具有优越的泛化能力。
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引用次数: 0
A Novel Spatiotemporal Attention Convolutional Neural Network for Video Crowd Counting 一种用于视频人群统计的时空注意卷积神经网络
Shangjie Zhang, Yuelei Xiao
For most existing crowd counting methods, image-based methods are still used for crowd counting in the presence of video datasets, ignoring powerful time information. Thus, a novel spatiotemporal attention convolutional neural network is proposed to solve the video-based crowd counting problem. Firstly, the first ten layers of VGG-16 are used as the backbone network to extract features, and a single layer of ConvLSTM captures the time correlation of adjacent frames. Then, stacked dilated convolutional layers are used to enlarge the receptive field without increasing the computational load. Finally, a convolutional block attention module is introduced with the adaptive refinement of feature mapping. Its ability to emphasize or suppress information in the channel and spatial dimensions aids information dissemination. Experimental results on the two reference datasets (i.e., Mall and WorldExpo'10) show that the proposed method further improves the accuracy of crowd counting and is superior to the other existing crowd counting methods.
对于大多数现有的人群计数方法,仍然使用基于图像的方法在视频数据集存在的情况下进行人群计数,忽略了强大的时间信息。为此,提出了一种新的时空注意卷积神经网络来解决基于视频的人群计数问题。首先,利用VGG-16的前10层作为主干网提取特征,利用单层ConvLSTM捕获相邻帧的时间相关性;然后,在不增加计算负荷的情况下,使用堆叠的扩展卷积层来扩大接收场。最后,引入了一种基于特征映射自适应细化的卷积块注意力模块。它在渠道和空间维度上强调或抑制信息的能力有助于信息的传播。在Mall和WorldExpo’10两个参考数据集上的实验结果表明,本文方法进一步提高了人群计数的准确性,优于现有的其他人群计数方法。
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引用次数: 0
Routing Method Based on Connectivity and Latency in VANET VANET中基于连通性和时延的路由方法
Hua Liu, Wujun Yang, Zhixian Chang, Min Shi
Due to VANET (vehicle ad-hoc network, VANET) has the characteristics of fast node movement and unstable network topology, the data transmission in the network faces the problems of disconnection of communication links and difficult to guarantee delay. Therefore, it is very important to design a routing algorithm that can ensure the stability of the communication link and the efficient data transmission. Based on the traditional GPSR protocol (greedy perimeter stateless routing, GPSR), this paper proposes an improved VANET routing method CL-GPSR, which makes forwarding decisions based on the established link connection time prediction model and delay estimation model. Simulation results show that the proposed CL-GPSR routing method can provide higher packet delivery rate and lower average delay.
由于VANET (vehicle ad-hoc network,简称VANET)具有节点移动速度快、网络拓扑结构不稳定的特点,使得网络中的数据传输面临通信链路断开、时延难以保证的问题。因此,设计一种能够保证通信链路稳定和数据高效传输的路由算法就显得尤为重要。本文在传统GPSR协议(贪心周边无状态路由,GPSR)的基础上,提出了一种改进的VANET路由方法CL-GPSR,该方法基于建立的链路连接时间预测模型和延迟估计模型进行转发决策。仿真结果表明,所提出的CL-GPSR路由方法能够提供较高的分组传输速率和较低的平均时延。
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引用次数: 0
UAV Visual Tracking Algorithm Based on Feature Fusion of the Attention Mechanism 基于注意力机制特征融合的无人机视觉跟踪算法
Sugang Ma, Zixian Zhang, Zhixian Zhao, Xiaobao Yang, Zhiqiang Hou
To enhance the expression ability of deep features and improve the tracking performance of the fully convolutional siamese network (SiamFC) in the UAV scene, we propose a UAV visual tracking algorithm based on feature fusion of the attention mechanism. By designing the local perception attention module and the global perception attention module to enhance the features extracted from the backbone network, a set of complementary local enhanced features and global enhanced features are obtained. And then, the tracking response map fused with the two features is then located, which effectively improves the tracking robustness of SiamFC in the UAV scene. The algorithm and nine other related algorithms such as SiamFC are tested on the DTB70 dataset. The experiments show that the algorithm has a good tracking performance and can adapt to the visual object tracking task in the UAV scene.
为了增强深度特征的表达能力,提高全卷积暹罗网络(SiamFC)在无人机场景中的跟踪性能,提出了一种基于注意力机制特征融合的无人机视觉跟踪算法。通过设计局部感知注意模块和全局感知注意模块对骨干网提取的特征进行增强,得到一组互补的局部增强特征和全局增强特征。然后,对融合了这两个特征的跟踪响应图进行定位,有效地提高了SiamFC在无人机场景下的跟踪鲁棒性。在DTB70数据集上对该算法和SiamFC等9种相关算法进行了测试。实验表明,该算法具有良好的跟踪性能,能够适应无人机场景中的视觉目标跟踪任务。
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引用次数: 0
MEMS Gyroscope Temperature Compensation Based on SSA-RBF Neural Network 基于SSA-RBF神经网络的MEMS陀螺仪温度补偿
Yuanhua Liu, Ziwei Wang, Xinliang Niu
The output of the Micro Electro-mechanical System (MEMS) gyroscope is susceptible affected by temperature drift, which reduces the measurement accuracy of the gyroscope. In this paper, a gyroscope temperature compensation method based on sparrow search algorithm (SSA) and radial basis function (RBF) neural network is proposed to reduce the temperature drift error of gyroscope. Firstly, we utilize the RBF neural network to establish the model of temperature error on the original output of gyroscope; then SSA is employed to find the optimal parameters of the RBF neural network in order to improve its search speed and generalization performance; finally, the optimized RBF neural network is applied to the temperature compensation of the gyroscope. The numerical simulation and comparison results under different temperatures demonstrate that, compared with polynomial and RBF neural network, the SSA-RBF neural network compensation method has superior compensation accuracy and faster convergence speed, which significantly reduces the maximum error, mean value and the standard deviation of gyroscope. Thus, the proposed SSA-RBF method can obtain more accurate fitting performance, effectively compensate the temperature error of MEMS gyroscope, and improve the MEMS gyroscope measurement accuracy.
微机电系统(MEMS)陀螺仪的输出容易受到温度漂移的影响,从而降低了陀螺仪的测量精度。为了减小陀螺仪的温度漂移误差,提出了一种基于麻雀搜索算法(SSA)和径向基函数(RBF)神经网络的陀螺仪温度补偿方法。首先,利用RBF神经网络建立陀螺仪原始输出的温度误差模型;然后利用SSA算法寻找RBF神经网络的最优参数,以提高其搜索速度和泛化性能;最后,将优化后的RBF神经网络应用于陀螺仪的温度补偿。不同温度下的数值模拟和对比结果表明,与多项式和RBF神经网络相比,SSA-RBF神经网络补偿方法具有更高的补偿精度和更快的收敛速度,显著降低了陀螺仪的最大误差、平均值和标准差。因此,所提出的SSA-RBF方法可以获得更精确的拟合性能,有效补偿MEMS陀螺仪的温度误差,提高MEMS陀螺仪的测量精度。
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引用次数: 0
Research and Implementation of Multi-feature Tracking Algorithms 多特征跟踪算法的研究与实现
Xinyue Zhang, Yao Tang
A single feature cannot adapt to the dynamic changes of the scene during video target tracking. This paper, to address this issue, first studies the tracking algorithm of multi-feature fusion, which uses the complementarity between different features to better adapt to the scene changes. On this basis, the APCE anti-occlusion criterion is added to enable the algorithm to resist the influence of target occlusion on tracking to a certain extent. The experimental results show that the average tracking accuracy of the proposed algorithm is about 0.779, which is about 2% higher than that of the SAMF algorithm, and the tracking success rate can be as high as 72%.
在视频目标跟踪过程中,单一特征无法适应场景的动态变化。针对这一问题,本文首先研究了多特征融合跟踪算法,利用不同特征之间的互补性,更好地适应场景变化。在此基础上,加入APCE抗遮挡准则,使算法能够在一定程度上抵抗目标遮挡对跟踪的影响。实验结果表明,该算法的平均跟踪精度约为0.779,比SAMF算法提高约2%,跟踪成功率可高达72%。
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引用次数: 0
Improved atrial fibrillation recognition algorithm based on residual network 基于残差网络的改进房颤识别算法
Zhiqiang Bao, Ting Ai, Ying Bai
An improved residual network model is proposed to deal with the complex and changeable characteristics of one-dimensional electrocardiogram. In this model, firstly, in order to avoid the network degradation problem of the model along with the deepening of the number of layers, when extracting various deep-level features of ECG signals using multiple convolution layers in CNN, the residual module is integrated into the network, and an appropriate shortcut connection is selected to connect the input with the superposition output of the corresponding convolution layer to construct a deep residual network to extract more abstract signal features. Secondly, the output of the last residual module is sent to the GAP layer, and the parameters of this layer are greatly reduced compared with those of the full connection layer, which is equivalent to the compression of the model, and thus the over-fitting of the model is avoided to a certain extent. Finally, the original ECG signals were automatically classified based on the PCinCC2017 database to complete the recognition of atrial fibrillation. Experimental results show that the proposed algorithm has a classification accuracy of 86% and a F1 measure of 83%, which prove the feasibility of the model and the effectiveness of the algorithm.
针对一维心电图复杂多变的特点,提出了一种改进的残差网络模型。在该模型中,首先,为了避免模型随着层数的加深而出现网络退化问题,在CNN中使用多个卷积层提取心电信号的各种深层特征时,将残差模块集成到网络中;并选择合适的捷径连接,将输入与对应卷积层的叠加输出连接起来,构建深度残差网络,提取更抽象的信号特征。其次,将最后一个残差模块的输出发送到GAP层,与全连接层相比,该层的参数大大减少,相当于对模型进行了压缩,从而在一定程度上避免了模型的过拟合。最后,基于PCinCC2017数据库对原始心电信号进行自动分类,完成对房颤的识别。实验结果表明,该算法的分类准确率为86%,F1测度为83%,证明了该模型的可行性和算法的有效性。
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引用次数: 0
期刊
Proceedings of the 2022 5th International Conference on Artificial Intelligence and Pattern Recognition
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