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multi-threshold Algorithm Based on Havrda and Charvat Entropy for Edge Detection in Satellite Grayscale Images

Journal of Software Engineering and Applications 2014年第1期7卷 42-52页

作者： Mohamed A. El-Sayed Hamida A. M. Sennari Department of Mathematics Faculty of Science Aswan University Aswan Egypt Department of Mathematics Faculty of Science Fayoum University Al Fayoum Egypt

Automatic edge detection of an image is considered a type of crucial information that can be extracted by applying detectors with different techniques. It is a main tool in pattern recognition, image segmentation, and scene analysis. This paper introduces an edge-detection algorithm, which generates multi-threshold values. It is based on non-Shannon measures such as Havrda & Charvat’s entropy, which is commonly used in gray level image analysis in many types of images such as satellite grayscale images. The proposed edge detection performance is compared to the previous classic methods, such as Roberts, Prewitt, and Sobel methods. Numerical results underline the robustness of the presented approach and different applications are shown.

关键词： multi-threshold Edge Detection Measure Entropy Havrda & Charvat’s Entropy

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multi-dimensional and multi-threshold Airframe Damage Region Division Method Based on Correlation Optimization

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Transactions of Nanjing University of Aeronautics and Astronautics 2021年第5期38卷 788-799页

作者： CAI Shuyu SHI Tao SHI Lizhong College of Aeronautical Engineering Civil Aviation University of ChinaTianjin 300300P.R.China

In order to obtain the image of airframe damage region and provide the input data for aircraft intelligent maintenance,a multi-dimensional and multi-threshold airframe damage region division method based on correlation optimization is *** the basis of airframe damage feature analysis,the multi-dimensional feature entropy is defined to realize the full fusion of multiple feature information of the image,and the division method is extended to multi-threshold to refine the damage division and reduce the impact of the damage adjacent region’s morphological changes on the *** the correlation parameter optimization algorithm,the problem of low efficiency of multi-dimensional multi-threshold division method is ***,the proposed method is compared and verified by instances of airframe damage *** results show that compared with the traditional threshold division method,the damage region divided by the proposed method is complete and accurate,and the boundary is clear and coherent,which can effectively reduce the interference of many factors such as uneven luminance,chromaticity deviation,dirt attachment,image compression,and so *** correlation optimization algorithm has high efficiency and stable convergence,and can meet the requirements of aircraft intelligent maintenance.

关键词： airframe damage region division multi-dimensional feature entropy multi-threshold correlation optimization aircraft intelligent maintenance

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ISAR Target multi-threshold Value Segmentation Algorithm Based on Quantification Energy Band

ISAR Target Multi-Threshold Value Segmentation Algorithm Bas...

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2011 2nd International Conference on Challenges in Environmental Science and Computer Engineering (CESCE 2011)

作者： Yang Yuqi Gao Xiaoguang Feng Xiaoyi Fan Jianping School of Electronics and Information Northwestern Polytechnical University Xi’an

ISAR image segmentation is the key step from ISAR image processing to ISAR image analysis. Since in ISAR target there is vast difference between the energy amplitudes of strong and weak scattering points, with the traditional image segmentation algorithm the strong and weak scattering points are suppressed evenly, resulting in for the geometry structure of the target the weak scattering point performance ability suppressed. In the article the author proposes based on the ISAR target chief axle and the target energy band analysis, using the different segmentation threshold value to carry on the segmentation for the different energy band region. The ISAR target segmentation result indicated that the method in the article has given dual attention to strong, and weak scattering regions, and protected the weak scattering spots effectively.

关键词： ISAR imaging image segmentation target axis quantitative energy band multi-threshold

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Research on Estimation of Time Delay Difference in Passive Locating for Impulse Signal

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Defence Technology（防务技术） 2011年第3期7卷 167-175页

作者：徐复何文翔惠俊英余赟 726th Research Institute China Shipbuilding Industry Corporation National Laboratory of Underwater Acoustic Technology Harbin Engineering University

Analyzed the relation between time delay difference and time delay estimation errors, based on the principles of three-point locating, a reformed threshold method for time delay difference estimation of impulse signals, called as amendment estimation for short, is developed by introducing channel equalization technique to its conventional version, named as direct estimation in this paper, to improve the estimation stability. After inherent relationship between time delay and phase shift of signals is analyzed, an integer period error compensation method utilized the diversities of both contribution share and contribution mode of concerned estimates is proposed under the condition of high precision phase lag estimation. Finally, a cooperative multi-threshold estimation method composed of amendment and direct estimations to process impulse signals with three thresholds is established. In sea trials data tests of passive locating, this method improves the estimation precision of time delay difference efficiently. The experiments verify the theoretical predictions.

关键词： information processing technique passive locating for impulse signal three point positioning time delay difference estimation amendment estimation integer period error compensation cooperative multi-threshold estimation

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An Improved SOI CMOS Technology Based Circuit Technique for Effective Reduction of Standby Subthreshold Leakage

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Circuits and Systems 2013年第6期4卷 431-437页

作者： Manish Kumar Md. Anwar Hussain Sajal K. Paul Department of Electronics and Communication Engineering North Eastern Regional Institute of Science and Technology Arunachal Pradesh India Department of Electronics Engineering Indian School of Mines Jharkhand India

Silicon-on-insulator (SOI) CMOS technology is a very attractive option for implementing digital integrated circuits for low power applications. This paper presents migration of standby subthreshold leakage control technique from a bulk CMOS to SOI CMOS technology. An improved SOI CMOS technology based circuit technique for effective reduction of standby subthreshold leakage power dissipation is proposed in this paper. The proposed technique is validated through design and simulation of a one-bit full adder circuit at a temperature of 27℃, supply voltage, VDD of 0.90 V in 120 nm SOI CMOS technology. Existing standby subthreshold leakage control techniques in CMOS bulk technology are compared with the proposed technique in SOI CMOS technology. Both the proposed and existing techniques are also implemented in SOI CMOS technology and compared. Reduction in standby subthreshold leakage power dissipation by reduction factors of 54x and 45x foraone-bit full adder circuit was achieved using our proposed SOI CMOS technology based circuit technique in comparison with existing techniques such as MTCMOS technique and SCCMOS technique respectively in CMOS bulk technology. Dynamic power dissipation was also reduced significantly by using this proposed SOI CMOS technology based circuit technique. Standby subthreshold leakage power dissipation and dynamic power dissipation were also reduced significantly using the proposed circuit technique in comparison with other existing techniques, when all circuit techniques were implemented in SOI CMOS technology. All simulations were performed using Microwindver 3.1 EDA tool.

关键词： Standby Subthreshold Leakage SOI Technology Low Power multi-threshold Voltage Stack Effect Reverse Gate Voltage

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SRAM Cell Leakage Control Techniques for Ultra Low Power Application: A Survey

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Circuits and Systems 2017年第2期8卷 23-52页

作者： Pavankumar Bikki Pitchai Karuppanan Department of Electronics and Communication Motilal Nehru National Institute of Technology Allahabad India

Low power supply operation with leakage power reduction is the prime concern in modern nano-scale CMOS memory devices. In the present scenario, low leakage memory architecture becomes more challenging, as it has 30% of the total chip power consumption. Since, the SRAM cell is low in density and most of memory processing data remain stable during the data holding operation, the stored memory data are more affected by the leakage phenomena in the circuit while the device parameters are scaled down. In this survey, origins of leakage currents in a short-channel device and various leakage control techniques for ultra-low power SRAM design are discussed. A classification of these approaches made based on their key design and functions, such as biasing technique, power gating and multi-threshold techniques. Based on our survey, we summarize the merits and demerits and challenges of these techniques. This comprehensive study will be helpful to extend the further research for future implementations.

关键词： Body Biasing Gate Leakage Junction Leakage Power Gating multi-threshold SRAM Cell Sub-threshold Leakage

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基于多阈值分割的快速舰船目标检测方法

基于多阈值分割的快速舰船目标检测方法

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第二十三届中国数据库学术会议

作者：洪志令姜青山董槐林王声瑞厦门大学计算机科学系厦门大学软件学院

1引言常见的基于区域的图像分割方法有阈值分割,区域生长与分裂合并和聚类分割法。阈值分割法是一种简单有效的图像分割方法,最具代表性的阈值分割方法有直方图阈值、类间方差阈值、最大熵值、模糊聚类分割法等。

关键词： Image segmentation Cluster analysis 2D-histogram multi-threshold Ship detection

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