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2016 9th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI)最新文献

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Design and implementation of the digital radio frequency memory system based on advanced extensible interface 4.0 基于高级可扩展接口4.0的数字射频存储系统的设计与实现
L. Yin, M. Xie, Haidi Li, Chao Wang, Xiongjun Fu
Digital radio frequency memory (DRFM) is an important part of modern electronic jamming equipment. It achieves high fidelity in the storage of radar waveform and guarantees the coherence between interference and radar signal. In this paper, a design scheme of the DRFM system based on FPGA and DSP is proposed, and the FPGA is the vital part of it. According to the complex FPGA function and high design challenge, an architecture based on advanced extensible interface 4.0 (AXI4) used to build the embedded system on FPGA is presented, which greatly enhances the flexibility of the system, speeds up the development, and brings conveniences for upgrade and maintenance.
数字射频存储器(DRFM)是现代电子干扰设备的重要组成部分。实现了雷达波形存储的高保真度,保证了干扰与雷达信号的相干性。本文提出了一种基于FPGA和DSP的DRFM系统的设计方案,FPGA是其中的重要组成部分。针对FPGA功能复杂、设计难度高的特点,提出了一种基于高级可扩展接口4.0 (AXI4)的FPGA嵌入式系统架构,大大提高了系统的灵活性,加快了开发速度,并为系统的升级和维护带来了便利。
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引用次数: 2
Intrusion detection of specific area based on video 基于视频的特定区域入侵检测
Hang Chen, Dongfang Chen, Xiaofeng Wang
In order to solve the problems of object detection and object tracking under complex scenes in video, this paper proposes a way to improve Gaussian Mixture Model algorithm based on the traditional Gaussian Mixture Model. When the model is updated, according to the characteristics of continuous video frame, the background model is divided into static regions and dynamic regions, and the background is updated in different strategies. Then, this paper presents an algorithm for the intrusion detection. Intrusion is judged by whether the centroid of the target is in the specific area. If the centroid is located outside the area, it shows that the target does not invade the specific area, otherwise the target invades the specific area. If so, the system triggers alarm and label information appear on the video frames. Experiments show that this algorithm can realize the intrusion detection of specific area.
为了解决视频中复杂场景下的目标检测和目标跟踪问题,本文在传统高斯混合模型的基础上提出了一种改进高斯混合模型算法的方法。在更新模型时,根据连续视频帧的特点,将背景模型划分为静态区域和动态区域,并采用不同的策略更新背景。然后,本文提出了一种入侵检测算法。入侵是通过目标的质心是否在特定区域来判断的。如果质心位于区域外,则表明目标没有入侵该特定区域,否则表明目标入侵了该特定区域。如果是,系统触发告警,并在视频帧上显示标签信息。实验表明,该算法可以实现特定区域的入侵检测。
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引用次数: 9
Self-adapting threshold of pulmonary parenchyma 肺实质自适应阈值
Xin-Yue Li, Fan Xu, Xiao Hu, Shao-Hu Peng, H. Nam, Jin-Ming Zhao
Segmentation for pulmonary parenchyma is a crucial step for computer aided diagnosis (CAD) systems. The accuracy of pulmonary parenchyma segmentation can have a great impact on further steps of CAD systems, such as pulmonary nodule detection and feature extraction. Before segmentation, preprocessing should be done to remove references outside the thorax. After preprocessing, pulmonary parenchyma area threshold will be employed to realize segmentation. However, current segmentation approaches are mainly based on a fixed area threshold, which confronts problem of mis-segmentation and high segmentation failure rate. This article proposed a novel self-adapting threshold segmentation approach, which realized fully automatic segmentation and held considerable accuracy rate. First, fitting of polynomials based on the least square law is constructed to fit curves of pulmonary parenchyma areas. Secondly, a golden standard is created to represent change trend of pulmonary parenchyma for all patients. Finally, the golden standard is adjusted accordingly to realize full adaption and automation of segmentation. Experimental results indicated that the proposed approach achieved excellent accuracy rate and precise segmentation.
肺实质的分割是计算机辅助诊断(CAD)系统的关键步骤。肺实质分割的准确性对CAD系统的后续步骤,如肺结节检测和特征提取有很大的影响。在分割之前,应该进行预处理以去除胸腔外的参考。预处理后,采用肺实质面积阈值进行分割。然而,目前的分割方法主要基于固定的区域阈值,存在分割错误和分割失败率高的问题。本文提出了一种新的自适应阈值分割方法,实现了全自动分割,并保持了较高的准确率。首先,基于最小二乘法构造多项式拟合,拟合肺实质面积曲线;其次,建立代表所有患者肺实质变化趋势的金标准。最后对黄金标准进行相应调整,实现分割的完全自适应和自动化。实验结果表明,该方法具有较高的分割准确率和分割精度。
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引用次数: 4
A vascular bifurcations detection method based on Transfer Learning model 一种基于迁移学习模型的血管分叉检测方法
Xiaoming Liu, Jia Wang, Zhou Yang
Many distinguished methods for vascular network detection in fundus images were proposed to help the diagnosis of clinical diseases. The vascular bifurcation sample in OCT projection images is quite limited while it is sufficient in the corresponding fundus images. In this paper, we proposed a transfer learning-based method to detect the vascular bifurcations in OCT projection images using supervised transfer learning method. The samples from fundus images are utilized with transfer learning technique for vascular bifurcations detection in OCT projection images. The experimental results show the accuracy of vascular bifurcations detection can be improved by the proposed method.
为了帮助临床疾病的诊断,提出了许多不同的眼底图像血管网络检测方法。OCT投影图像中的血管分叉样本非常有限,而相应的眼底图像中的血管分叉样本则很充足。在本文中,我们提出了一种基于迁移学习的方法来检测OCT投影图像中的血管分支。将眼底图像样本与迁移学习技术相结合,用于OCT投影图像的血管分叉检测。实验结果表明,该方法可以提高血管分岔检测的精度。
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引用次数: 1
An optimal sub array partitioning method based on directed graph path search 一种基于有向图路径搜索的最优子阵列划分方法
Lian-qing Yu, Huan Zhu, Si-ming Li, Yu-Hao Yang
Based on the division or partition of sub array of airborne early warning (AEW) radar, a new method for the partition of the sub array is proposed, which is based on the path search of the directed graph. Under the condition that the number of sub array is given, to maximize the improved factor of sub array level STAP and the lowest side-lobe are the optimization criterion, which is used to search the optimal sub array. Finally, comparing research with other methods is also presented, and the simulation results demonstrate the efficacy of the proposed methods.
在机载预警雷达子阵划分的基础上,提出了一种基于有向图路径搜索的子阵划分新方法。在子阵列数量给定的情况下,以子阵列电平STAP和最低副瓣为优化准则,搜索最优子阵列。最后,与其他方法进行了对比研究,仿真结果验证了所提方法的有效性。
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引用次数: 1
A 3D multi-scale Block LBP Filter for lung nodule enhancement based on the CT images 基于CT图像的肺结节三维多尺度块LBP滤波器增强
Fan Xu, Wen-Jing Zhang, Xin-Yue Li, Hu Xiao, Shao-Hu Peng, H. Nam, M. Zhang
The computer-aided diagnostic (CAD) system can greatly influence the early detection of lung cancer in radiographs and computed tomography (CT) images. And the automatic nodule detection plays an important role in the CAD systems. This paper proposed a new enhancement filter (3D multi-scale Block LBP Filter) to detect the nodules in the lung regions. By taking advantages of the nodule regions' pixel value characteristics and shape features, the proposed filter is able to enhance the nodule-like regions and restrain the line-like regions and edge regions. Moreover, Integral Image Technique (IIT) is applied accelerate the processing speed of the filter. Experimental results showed that the proposed filter can improve the accuracy and reduce the false positive.
计算机辅助诊断(CAD)系统可以极大地影响x线片和计算机断层扫描(CT)图像对肺癌的早期发现。而自动结节检测在CAD系统中起着重要的作用。本文提出了一种新的增强滤波器(3D多尺度块LBP滤波器)来检测肺区域的结节。该滤波器利用结节区域的像素值特征和形状特征,增强了结节区域,抑制了线状区域和边缘区域。在此基础上,应用积分图像技术(IIT)提高了滤波器的处理速度。实验结果表明,该滤波器可以提高检测精度,减少误报。
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引用次数: 6
Digital watermarking based on interleaving extraction block compressed sensing in Contourlet domain 基于Contourlet域交错提取块压缩感知的数字水印
C. Zhao, Hongbo Bi, Y. Liu, Ning Li
Traditional digital watermarking in transform domain computes complex and has limited anti-attack. Different ways of signal sparsity of compressed sensing represent different domains, which expands the embeddable space of watermarking. To take advantage of its multi-direction and multi-resolution characteristics to sparse image, Contourlet transform was analyzed. For the limitation of traditional block decision, we adopt the interleaving extraction to reduce the block artifacts. Furthermore, we presented the watermarking algorithm based on interleaving extraction block compressed sensing in Contourlet domain, simulation results verifies that the algorithm enhances the peak signal to noise ratio. Attack tests show that the proposed digital watermarking has better robustness against JPEG compression, noising, cutting etc.
传统的变换域数字水印计算复杂,抗攻击能力有限。压缩感知中不同的信号稀疏度表示不同的域,扩展了水印的可嵌入空间。为了利用Contourlet变换对稀疏图像多方向、多分辨率的特点,对Contourlet变换进行了分析。针对传统分块判定方法的局限性,采用交错提取的方法来减少分块伪影。在此基础上,提出了基于Contourlet域交错提取块压缩感知的水印算法,仿真结果验证了该算法提高了峰值信噪比。攻击测试表明,所提出的数字水印对JPEG压缩、噪声、剪切等具有较好的鲁棒性。
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引用次数: 1
A robust point detection algorithm based on wavelet transform for visual tracking 基于小波变换的鲁棒视觉跟踪点检测算法
Rongfeng Zhang, Huanhou Xiao, Ting Deng, Wei Qiu, Jinglun Shi
Visual tracking is one of the hot research topics in computer vision in recent years. It has been widely used in many vision applications, such as traffic surveillance, anti-terrorism. However, there are still challenges for visual tracking, like illumination change, object occlusion, appearance deformation, etc. This paper proposes a robust point detection algorithm based on wavelet transform for visual tracking. First, the input image patch that includes the tracking object is decomposed by wavelet transform with several levels and the wavelet coefficients are obtained. The wavelet coefficients are then analyzed and the points that hold the local maximal wavelet coefficients are determined as the robust points for tracking. Finally, the proposed method is integrated to the Tracking Learning Detection (TLD) framework, which not only improves the tracking precision, but also reduces the false detection. Experimental results showed that the new algorithm outperformed the TLD method with respect to the precision, recall, and f-measure.
视觉跟踪是近年来计算机视觉领域的研究热点之一。在交通监控、反恐等视觉应用中得到了广泛的应用。然而,视觉跟踪仍然存在一些挑战,如光照变化、物体遮挡、外观变形等。提出了一种基于小波变换的鲁棒视觉跟踪点检测算法。首先,对包含跟踪目标的输入图像进行小波分解,得到小波系数;然后对小波系数进行分析,确定具有局部极大小波系数的点作为鲁棒跟踪点。最后,将该方法与跟踪学习检测(TLD)框架相结合,既提高了跟踪精度,又减少了误检。实验结果表明,新算法在查全率、查全率和f-measure方面都优于TLD方法。
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引用次数: 1
A modeling method of customized brackets and individualized trays for orthodontic treatment 一种用于正畸治疗的定制托槽和个性化托盘的建模方法
Rui Xing, N. Dai, Yicheng Zhong, Yihua Zhang, Yi Liu
In the process of orthodontic treatment, in order to make patients adorn appropriate brackets fast and accurately, this paper proposes a new modeling method of customized brackets and individualized trays. First of all, as the straight-wire can smoothly pass through all bracket slots after orthodontic treatment, bracket bodies in the database are positioned to the tooth surfaces automatically. Then some of them may be adjusted manually in accordance with specific conditions. Subsequently, customized brackets are designed based on the teeth morphology of patient. Finally, we can create each individualized tray rapidly on the basis of isometric extrude operation and Boolean operation. Some experiments have been tested by 3D printing technology and modeling platform. The results proved that the proposed modeling method has higher efficiency and the bonded bracket positioning is accurate and reliable.
在正畸治疗过程中,为了使患者快速准确地佩戴合适的托槽,本文提出了一种定制托槽和个性化托槽的新型建模方法。首先,由于正畸治疗后直丝可以顺利通过所有托槽,数据库中的托体自动定位到牙面。然后可以根据具体情况手动调整其中的一些。然后根据患者的牙齿形态设计定制托槽。最后,我们可以在等距挤出操作和布尔运算的基础上,快速创建每个个性化的托盘。利用3D打印技术和建模平台对部分实验进行了测试。结果表明,所提出的建模方法具有较高的建模效率,并且粘结支架定位准确可靠。
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引用次数: 0
A particle swarm optimization algorithm for unmixing the polynomial post-nonlinear mixing model 多项式后非线性混合模型解混的粒子群优化算法
L. Zhong, W. Luo, Lianru Gao
Spectral unmixing is an important technique for hyperspectral data exploring. Recently the nonlinear unmixing technique which considers the nonlinear mixing terms becomes an important issue of spectral unmixing. Here, we consider a particle swarm optimization technique for nonlinear unmixing. Our motivation is to make a first step to exploit the potential capability of PSO for nonlinear unmixing. The proposed algorithm does not need any prior information concerning about the gradient or hessian matrix. Therefore, it can be easily applied to characterize complex nonlinear mixtures. In addition, it provides a stochastic mechanism that can improve the probability to find a better solution. Furthermore, the experimental results indicate that our algorithm can outperform the traditional algorithm for both synthetic and real hyperspectral data.
光谱解混是高光谱数据探测的重要技术。近年来,考虑非线性混合项的非线性解混技术成为光谱解混的一个重要问题。在此,我们考虑了一种非线性解混的粒子群优化技术。我们的动机是迈出第一步,开发粒子群非线性解混的潜在能力。该算法不需要任何关于梯度和hessian矩阵的先验信息。因此,它可以很容易地用于表征复杂的非线性混合物。此外,它还提供了一种随机机制,可以提高找到更好解的概率。此外,实验结果表明,该算法对合成高光谱数据和真实高光谱数据都优于传统算法。
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引用次数: 2
期刊
2016 9th International Congress on Image and Signal Processing, BioMedical Engineering and Informatics (CISP-BMEI)
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