The detection of hydrophobicity is an important way to evaluate the performance of composite insulators, which is helpful to the safe operation of composite insulators. Image processing technology is used to judge the...The detection of hydrophobicity is an important way to evaluate the performance of composite insulators, which is helpful to the safe operation of composite insulators. Image processing technology is used to judge the hydrophobicity of composite insulators, which makes detection results more accurate and overcomes the subjective drawbacks of traditional detection methods.?As the traditional Canny operator requires manual intervention in selecting the variance of the Gaussian filter and the threshold, the paper presents a method of edge detection based on improved Canny operator. First, the adaptive median filter replaces the Gaussian filter, which can eliminate the impact from the variance of Gaussian filter and remove noise according to the characteristics of the image itself. Then the Ostu threshold method is used to select the best threshold automatically, which makes the edge detection be more continuous and reduce the presence of fake edges. The results show that the operator is applicable to all hydrophobic images.展开更多
To preserve the sharp features and details of the synthetic aperture radar (SAR) image effectively when despeckling, a despeckling algorithm with edge detection in nonsubsampled second generation bandelet transform ...To preserve the sharp features and details of the synthetic aperture radar (SAR) image effectively when despeckling, a despeckling algorithm with edge detection in nonsubsampled second generation bandelet transform (NSBT) domain is proposed. First, the Canny operator is utilized to detect and remove edges from the SAR image. Then the NSBT which has an optimal approximation to the edges of images and a hard thresholding rule are used to approximate the details while despeckling the edge-removed image. Finally, the removed edges are added to the reconstructed image. As the edges axe detected and protected, and the NSBT is used, the proposed algorithm reaches the state-of-the-art effect which realizes both despeckling and preserving edges and details simultaneously. Experimental results show that both the subjective visual effect and the mainly objective performance indexes of the proposed algorithm outperform that of both Bayesian wavelet shrinkage with edge detection and Bayesian least square-Gaussian scale mixture (BLS-GSM).展开更多
The conventional methods of edge detection can roughly delineate edge position of geological bodies,but there are still some problems such as low detection accuracy and being susceptible to noise interference.In this ...The conventional methods of edge detection can roughly delineate edge position of geological bodies,but there are still some problems such as low detection accuracy and being susceptible to noise interference.In this paper,three image processing methods,Canny,Lo G and Sobel operators are briefly introduced,and applied to edge detection to determine the edge of geological bodies.Furthermore,model data is built to analyze the edge detection ability of this image processing methods,and compare with conventional methods.Combined with gravity anomaly of Sichuan basin and magnetic anomaly of Zhurihe area,the detection effect of image processing methods is further verified in real data.The results show that image processing methods can be applied to effectively identify the edge of geological bodies.Moreover,when both positive and negative anomalies exist and noise is abundant,fake edge can be avoided and edge division is clearer,and satisfactory results of edge detection are obtained.展开更多
Image processing is widely used as a method for visnal inspection in industry. Analyzing the microstructure image of a brazed joint is a very important part of the quality control in products related to brazing aUoys....Image processing is widely used as a method for visnal inspection in industry. Analyzing the microstructure image of a brazed joint is a very important part of the quality control in products related to brazing aUoys. Edge detection techniques are introduced to analyze the bonding strength of the brazing alloys in this paper. Gaussian filter is used for image smoothing. The sharp edge map produced by the Canny edge detector is added to the smoothed noisy image to generate the edge image, which can show the brazing elements clearly. Using the Canny edge detector as a tool to analyze the bonding strength of brazed joint, the experiment results are robust with a very high level. Therefore, the Canny edge detector can be reliably used to analyze the brazed joint interfaces.展开更多
为有效进行芯片标识的提取,提出一种基于灰狼优化算法(gray wolf optimization,GWO)的改进动态双阈值的Canny算子来进行芯片标识图像边缘提取。首先,从芯片标识生产环境复杂、图像干扰信息多的角度出发,对Canny算子的双阈值进行改进;其...为有效进行芯片标识的提取,提出一种基于灰狼优化算法(gray wolf optimization,GWO)的改进动态双阈值的Canny算子来进行芯片标识图像边缘提取。首先,从芯片标识生产环境复杂、图像干扰信息多的角度出发,对Canny算子的双阈值进行改进;其次,使用灰狼优化算法确定其高阈值选取;最后,将本文算法与传统Log、Prewitt、Roberts、Canny、Sobel算子进行实验比较,利用召回率和精确率等方法作了客观评估。实验结果表明,本文所提算法优于传统的边缘提取算法,提取准确度高,为后续识别打下了坚实基础。展开更多
文摘The detection of hydrophobicity is an important way to evaluate the performance of composite insulators, which is helpful to the safe operation of composite insulators. Image processing technology is used to judge the hydrophobicity of composite insulators, which makes detection results more accurate and overcomes the subjective drawbacks of traditional detection methods.?As the traditional Canny operator requires manual intervention in selecting the variance of the Gaussian filter and the threshold, the paper presents a method of edge detection based on improved Canny operator. First, the adaptive median filter replaces the Gaussian filter, which can eliminate the impact from the variance of Gaussian filter and remove noise according to the characteristics of the image itself. Then the Ostu threshold method is used to select the best threshold automatically, which makes the edge detection be more continuous and reduce the presence of fake edges. The results show that the operator is applicable to all hydrophobic images.
基金supported by the National Natural Science Foundation of China(6067309760702062)+3 种基金the National HighTechnology Research and Development Program of China(863 Program)(2008AA01Z1252007AA12Z136)the National ResearchFoundation for the Doctoral Program of Higher Education of China(20060701007)the Program for Cheung Kong Scholarsand Innovative Research Team in University(IRT 0645).
文摘To preserve the sharp features and details of the synthetic aperture radar (SAR) image effectively when despeckling, a despeckling algorithm with edge detection in nonsubsampled second generation bandelet transform (NSBT) domain is proposed. First, the Canny operator is utilized to detect and remove edges from the SAR image. Then the NSBT which has an optimal approximation to the edges of images and a hard thresholding rule are used to approximate the details while despeckling the edge-removed image. Finally, the removed edges are added to the reconstructed image. As the edges axe detected and protected, and the NSBT is used, the proposed algorithm reaches the state-of-the-art effect which realizes both despeckling and preserving edges and details simultaneously. Experimental results show that both the subjective visual effect and the mainly objective performance indexes of the proposed algorithm outperform that of both Bayesian wavelet shrinkage with edge detection and Bayesian least square-Gaussian scale mixture (BLS-GSM).
基金Supported by projects of the National Key Research and Development Plan(Nos.2017YFC0602203,2017YFC0601606)the National Science and Technology Major Project Task(No.2016ZX05027-002-003)+1 种基金the National Natural Science Foundation of China(Nos.41604089,41404089)the State Key Program of National Natural Science of China(No.41430322)
文摘The conventional methods of edge detection can roughly delineate edge position of geological bodies,but there are still some problems such as low detection accuracy and being susceptible to noise interference.In this paper,three image processing methods,Canny,Lo G and Sobel operators are briefly introduced,and applied to edge detection to determine the edge of geological bodies.Furthermore,model data is built to analyze the edge detection ability of this image processing methods,and compare with conventional methods.Combined with gravity anomaly of Sichuan basin and magnetic anomaly of Zhurihe area,the detection effect of image processing methods is further verified in real data.The results show that image processing methods can be applied to effectively identify the edge of geological bodies.Moreover,when both positive and negative anomalies exist and noise is abundant,fake edge can be avoided and edge division is clearer,and satisfactory results of edge detection are obtained.
基金This work is supported by Shandong Province Natural Science Foundation ( No. Q2008G02) and Shanghai Municipal Education Commission Scientific Foundation Projection (No. K06LZ014).
文摘Image processing is widely used as a method for visnal inspection in industry. Analyzing the microstructure image of a brazed joint is a very important part of the quality control in products related to brazing aUoys. Edge detection techniques are introduced to analyze the bonding strength of the brazing alloys in this paper. Gaussian filter is used for image smoothing. The sharp edge map produced by the Canny edge detector is added to the smoothed noisy image to generate the edge image, which can show the brazing elements clearly. Using the Canny edge detector as a tool to analyze the bonding strength of brazed joint, the experiment results are robust with a very high level. Therefore, the Canny edge detector can be reliably used to analyze the brazed joint interfaces.
文摘为有效进行芯片标识的提取,提出一种基于灰狼优化算法(gray wolf optimization,GWO)的改进动态双阈值的Canny算子来进行芯片标识图像边缘提取。首先,从芯片标识生产环境复杂、图像干扰信息多的角度出发,对Canny算子的双阈值进行改进;其次,使用灰狼优化算法确定其高阈值选取;最后,将本文算法与传统Log、Prewitt、Roberts、Canny、Sobel算子进行实验比较,利用召回率和精确率等方法作了客观评估。实验结果表明,本文所提算法优于传统的边缘提取算法,提取准确度高,为后续识别打下了坚实基础。