共查询到19条相似文献,搜索用时 125 毫秒
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介绍了MTC钢丝绳安全检测仪的检测原理及现场应用,将该仪器用于流动式起重机在役钢丝绳的无损检测,确保了钢丝绳运行的安全和可靠. 相似文献
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基于小波重构的皮革表面检测方法 总被引:2,自引:0,他引:2
纹理表面的瑕疵检测是机器视觉的一个重要研究课题,已经广泛用于各种产品表面质量控制.本文主要研究皮革制造业中皮革纹理表面的检测,并提出了一种有效的选取小波频带重建图像的纹理瑕疵检测方法.该方法首先应用小波基函数在较优的分解级数上对纹理图像进行分解,然后在最佳的分辨率级数上正确的选取平滑图像或者细节图像来重建图像.在重建图像中均匀纹理图案被有效的移除,仅仅保留了局部瑕疵区域,小波频带选取是基于小波系数的能量分布自动确定最佳重构参数.实验表明,该方法有效,可用于实时在线检测. 相似文献
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崔敏杨怀斌谢盛珍庞博维 《制造业自动化》2020,(1):10-14
针对当前采用人工检测方法普遍存在效率低、容易出现误判、检测不方便等问题,提出一种基于机器视觉与图像处理相结合的轮胎纹理深度检测方法,设计了相应的检测系统。通过工业相机和激光器相配合获取汽车轮胎纹理图像,利用图像处理和误差补偿对图像进行处理获取轮胎纹理深度数据。通过实验验证了所提出的方法的可行性,为行驶中检测打下基础。 相似文献
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Xiangqian Peng Youping Chen Wenyong Yu Zude Zhou Guodong Sun 《The International Journal of Advanced Manufacturing Technology》2008,39(11-12):1180-1189
Quality control is a crucial issue in a float glass factory, and defects existing in float glass can dramatically depress glass grade. Manual inspection in float glass quality control cannot catch up with the development of float glass industry, and automatic glass defect inspection has been a trend. An online defects inspection method for float glass based on machine vision is presented in this paper, and a distributed online defect inspection system for float glass fabrication is realized. This method inspects defects through detecting the change of image gray levels caused by the difference in optic character between glass and defects. A series of image processing algorithms are set up around the analysis of glass image and the requirements of online inspection system such as reliability, real-time, and veracity. Image filtration based on gradient direction is used to filter noise and reserve the source information of defects. Downward threshold based on adaptive surface removes the background composed with stripes and strengthens defect features. Distortion part and core part of defects are obtained through fixed threshold and OTSU algorithms with gray range restricted, respectively. The fake defects (insects, dust, etc.) are eliminated based on the texture of real defects. The application of an inspection system based on this method in Wuhan glass factory proves this inspection method is effective, accurate, and reliable. 相似文献
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Automated Surface Inspection Using Gabor Filters 总被引:10,自引:2,他引:10
D.-M. Tsa S.-K. Wu 《The International Journal of Advanced Manufacturing Technology》2000,16(7):474-482
In this paper we present a machine vision system for the automatic inspection of defects in textured surfaces found in industry.
The defects to be inspected are those that appear as local anomalies embedded in a homogeneous texture. The proposed method
is based on a Gabor filtering scheme that computes the output response of energy from the convolution of a textured image
with a specific Gabor filter. The best parameters of a Gabor filter are selected so that the energy of the homogeneous texture
is zero, and any unpredictable defeats will generate significantly large energy values. A simple thresholding scheme then
follows to discriminate between homogeneous regions and defective regions in the filtered image. This transforms texture differences
into detectable filter output. The experiments on structural textures such as leather and sandpaper have shown the effectiveness
of the proposed method. 相似文献
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Ceramic and tile industries should indispensably include a grading stage to quantify the quality of products. Actually, human control systems are often used for grading purposes. An automatic grading system is essential to enhance the quality control and marketing of the products. Since there generally exist six different types of defects originating from various stages of tile manufacturing lines with distinct textures and morphologies, many image processing techniques have been proposed for defect detection. In this paper, a survey has been made on the pattern recognition and image processing algorithms which have been used to detect surface defects. Each method appears to be limited for detecting some subgroup of defects. The detection techniques may be divided into three main groups: statistical pattern recognition, feature vector extraction and texture/image classification. The methods such as wavelet transform, filtering, morphology and contourlet transform are more effective for pre-processing tasks. Others including statistical methods, neural networks and model-based algorithms can be applied to extract the surface defects. Although, statistical methods are often appropriate for identification of large defects such as Spots, but techniques such as wavelet processing provide an acceptable response for detection of small defects such as Pinhole. A thorough survey is made in this paper on the existing algorithms in each subgroup. Also, the evaluation parameters are discussed including supervised and unsupervised parameters. Using various performance parameters, different defect detection algorithms are compared and evaluated. 相似文献
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D.-M. Tsai C.-P. Lin 《The International Journal of Advanced Manufacturing Technology》2002,20(9):664-675
In this paper, we present a fast machine vision method for the automatic inspection of defects in textured surfaces. Traditional
2D Gabor filtering schemes have been shown to be very effective for detecting local anomalies in textured surfaces of industrial
materials. However, they are computationally expensive and sensitive to image rotation. In order to alleviate the limitations
of 2D Gabor filtering, we first use a 1D ring-projection transformation to compress a 2D grey-level image into a 1D pattern,
and then employ a 1D Gabor filter to detect defects embedded in a homogeneous texture. Given a problem with image size N × N and filter window W × W, the computational complexity can be reduced significantly from O(W
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N
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) in the 2D Gabor space to O(WN
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) in the 1D Gabor space, and the detection results are invariant to rotation changes of a texture. The experiments on structural
textures such as a wooden surface, an LCD display, and a machined surface, and statistical textures such as granite, leather,
and sandpaper have shown the efficiency and effectiveness of the proposed method.
ID="A1" Correspondence and offprint requests to: Dr Du-Ming Tsai, Department of Industrial Engineering and Management, Yuan-Ze University, 135 Yuan-Tung Road, Nei-Li, Tao-Yuan,
Taiwan. E-mail: iedmtsai@saturn.yzu.edu.tw 相似文献
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基于子区域变尺度高斯拟合的木材表面缺陷识别 总被引:3,自引:0,他引:3
为了提高木材的使用效率、避免由于木材缺陷造成生产故障,根据木材缺陷类型对其分类处理是一种有效的手段,但木材缺陷复杂多样且具有诸多相似性使得类别区分成为难点。针对以上问题本文提出了一种基于子区域变尺度高斯拟合模型的缺陷识别方法。首先建立变尺度高斯拟合基本模型,然后将缺陷纹理分成若干子区域,提取各分区的高斯拟合特征并进行融合;将高斯融合特征及圆度和边缘直线度这两个几何特征输入到建立好的BP神经网络模型中进行训练,根据优化训练的网络模型识别缺陷。该方法对自建的SUT-W图库中雪糕棒图像上人工标定的裂缝、矿物线、矿物块和黑节子的准确识别率分别为91.72%、92.77%、92.67%和92.80%,与其他典型纹理检测方法相比,4种缺陷准确识别率最高分别提高9.38%、6.69%、13.55%和10.22%,说明本文方法能够有效地将以上4种缺陷分辨开,具有一定的实际应用价值。 相似文献
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钢丝微动疲劳过程中,钢丝裂纹萌生特性直接影响其裂纹扩展特性,进而制约钢丝微动疲劳寿命,因此开展钢丝微动疲劳裂纹萌生寿命预测研究具有重要意义。基于有限元法、摩擦学理论和断裂力学理论,运用Smith-Watson-Topper(SWT)多轴疲劳寿命准则建立考虑磨损的钢丝微动疲劳裂纹萌生寿命预测模型,基于多种不同的钢丝疲劳参数估算方法对钢丝的微动疲劳裂纹萌生寿命进行了预测,并探究接触载荷、疲劳载荷、交叉角度及钢丝直径等微动疲劳参数对钢丝微动疲劳裂纹萌生寿命的影响规律。结果表明:基于中值法的预测结果最接近实际值;在微动疲劳过程中,钢丝微动疲劳裂纹萌生寿命主要与接触载荷和疲劳载荷相关。通过引入微动损伤参数建立简化的适用于钢丝绳的钢丝微动疲劳裂纹萌生寿命预测模型,通过与考虑磨损的预测模型计算结果进行对比验证了该模型的准确性。 相似文献
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Jong Pil Yun Doo-chul Choi Yong-ju Jeon Changhyun Park Sang Woo Kim 《The International Journal of Advanced Manufacturing Technology》2014,70(9-12):1625-1634
A vision-based inspection system has been investigated in order to improve the quality of products and processes found in various industries. In this paper, we propose a new defect detection algorithm for steel wire rods produced by the hot rolling process. Because the steel wire rods are long cylinder rods with a circular cross section, the brightness at the sides and center is inconsistent. Moreover, the various types of steel wire rods and the presence of scales affect the reflection properties of the rod surface. In order to resolve the abovementioned difficulties, the use of dynamic programming and a discrete wavelet transform are proposed. An adaptive local binarization method is used to further reduce the effects of scale. The effectiveness of the proposed method is shown by means of experiments conducted on images of steel wire rods that were obtained from an actual steel production line. 相似文献
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Chi-Jie Lu Du-Ming Tsai 《The International Journal of Advanced Manufacturing Technology》2005,25(1-2):53-61
Thin film transistor liquid crystal displays (TFT-LCDs) have become increasingly popular and dominant as display devices. Surface defects on TFT panels not only cause visual failure, but result in electrical failure and loss of LCD operational functionally. In this paper, we propose a global approach for automatic visual inspection of micro defects on TFT panel surfaces. Since the geometrical structure of a TFT panel surface involves repetitive horizontal and vertical elements, it can be classified as a structural texture in the image. The proposed method does not rely on local features of textures. It is based on a global image reconstruction scheme using the singular value decomposition (SVD). Taking the image as a matrix of pixels, the singular values on the decomposed diagonal matrix represent different degrees of detail in the textured image. By selecting the proper singular values that represent the background texture of the surface and reconstructing the matrix without the selected singular values, we can eliminate periodical, repetitive patterns of the textured image, and preserve the anomalies in the restored image. In the experiments, we have evaluated a variety of micro defects including pinholes, scratches, particles and fingerprints on TFT panel surfaces, and the result reveals that the proposed method is effective for LCD defect inspections. 相似文献