共查询到19条相似文献,搜索用时 156 毫秒
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本文针对人工检测轮毂轴承缺陷效率低、人为因素影响大的问题,提出了一种基于机器视觉的轮毂轴承缺陷检测的方法。首先,对采集到的轮毂轴承的图片进行预处理,对预处理后的图像进行匹配,实现对目标与缺陷区域的快速粗定位;然后采用基于区域灰度值的图像分割和基于区域形态学的最小二乘法进行缺陷提取。实验表明,采用本方法提取的轮毂轴承缺陷与实际的缺陷图像相似度高,验证了该方法的有效性。 相似文献
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为提高微缺陷检测结果精度、提升机械加工零件外观质量,该文引进了机器视觉技术,以某机械生产制造单位为例,设计了一种针对零件表面微缺陷的全新检测方法。根据机器视觉技术的应用需求,搭建了集成工业相机、采集装置、照射光源等为一体的扫描装置,采集零件表面图像;对采集的原始图像进行均值滤波处理,去除图像中可能对缺陷区域的判别造成干扰的因素与噪声;采用阈值分割的方式,提取并划分机械加工零件表面的微缺陷区域;采用提取图像边缘算子的方法,计算零件表面原始图像与待检测图像之间的像素相关性,通过对零件表面微缺陷灰度性质点的匹配,完成检测方法的设计。通过对比实验证明:该方法不仅可以精准检测机械加工零件表面微缺陷,还可以检测到具体的缺陷类别。 相似文献
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浅地层探地雷达目标探测和定位新方法 总被引:1,自引:1,他引:1
提出基于模板匹配的探地雷达目标自动探测与定位新方法,和图像分割方法相结合以减少模板匹配的计算量。将雷达图像分割成可能存在目标的区域和背景数据区域,对可能存在目标的区域进行模板匹配计算。模板根据待匹配点的深度生成。如果探测到金属目标则对模板倒相,实现金属目标的准确定位。所提方法包括图像分割、模板生成、匹配算法、金属目标识别和模板倒相算法。对实测数据处理的结果表明,所提方法探测和定位准确、鲁棒性好。 相似文献
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在集成电路芯片光学检测中,完整而准确地获取芯片形貌的图像非常重要.针对集成电路芯片表面形貌图像获取的要求,首先讨论集成电路芯片图像放大采集系统构成及工作原理,并研究图像拼接在精密芯片图像检测中的必要性及重要性,针对集成芯片的微观表面图像特征处理的要求,提出集成电路芯片的区域像素二阶中心矩图像拼接技术,通过建立图像区域像素的二阶中心矩进行匹配点的准确搜索,随后进行芯片精密显微图像的拼接.编程实验证明,采用本方法可获得集成电路芯片表面的清晰图像,并使芯片的微观形貌和细小缺陷等细节能得到很好的展现. 相似文献
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Chin-Sheng Chen Chien-Liang Huang Chun-Wei Yeh 《The International Journal of Advanced Manufacturing Technology》2013,65(1-4):43-56
The requirements for high-speed and high-precision defect inspection in semiconductor chip are growing rapidly because of the complicated surface in semiconductor chip. Due to manufacturing tolerance of IC tray, the misalignment from the chip positioning shift and rotation are always presented for the application of in-tray inspection. In the beginning, this paper focuses on compensating the positioning shift and rotation of in-tray chip by using the proposed image alignment algorithm before the defect detection. After applying the process of image alignment, a hybrid approach of defect detection is applied to detect the defects of in-tray chip. Furthermore, this hybrid approach simultaneously detects the defects based on its surface by the following two categories: (1) the complicated surface in the circuit and (2) the primitive surface on the bump. As mentioned above, the image alignment strategy and the adaptive image difference method are applied in the detection of complicated surface, and the design-rule strategy is adapted to detect the defects on bumps. Finally, the experimental results show that the proposed image alignment strategy and hybrid approach can accurately and rapidly inspect the defects of in-tray chip. This approach is superior to the traditional template matching in defect detection. In addition, the computational complexity can be efficiently reduced by the proposed hybrid strategy. 相似文献
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A new self-calibration method for a piezoelectric actuator-based vision-guided cell micromanipulation system is proposed. This method consolidates all the system parameters' uncertainties into a matrix instead of classifying into intrinsic and extrinsic. The position difference of the micromanipulator tip in the image plane between the measured and estimated output which is based on estimations of relevant parameters is assumed to be caused by the matrix. This matrix is estimated by means of collecting several pairs of known input and the corresponding output differences. Matrix standard deviation and gray-value based matching are applied to identify the output differences. Biological contamination is reduced since a calibration template is not required. This self-calibration is particularly suitable for cell micromanipulation systems where the micromanipulator is frequently dismounted and mounted. 相似文献
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Image monitoring of the wear surfaces of moving pairs within machinery is investigated using a microscopy CCD imaging method and computer image process technology. The imaging measurement system of rubbing parts was constructed on the basis of an Amsler friction and wear test machine. Image capture of characteristic wear surfaces was achieved through a synchronous control system with sampling delay computing. Image process technology was applied to characterise the images of adhesive wear and abrasive wear. Wear images were first enhanced by median filtering method then a reiterative algorithm was used to compute the segmenting thresholds. A Kirsch-operator template matching method was then used to detect the edges of the binary image, so that a distinct shape contour expressing wear region features could be obtained. Consequently, the areas and ratios of different characteristic wear regions were measured by means of the image region depiction method of border tracing algorithm. 相似文献
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为解决橡胶栓检测中图像的自适应旋转这一难题,将图像识别中的最小距离匹配方法引入图像旋转,并利用迭代法实现了旋转匹配过程。首先,将旋转角度为0°的标准图像存储为模板,然后计算待检测图像与标准模板间的距离,再利用迭代运算使图像不断转动,减小图像与模板间的距离,直到该距离小于某一给定值。在原始的迭代算法的基础上,还提出了一种简化的迭代算法,在保证旋转精度的前提下具有更快的运算速度。实验结果表明,基于迭代匹配的橡胶栓图像自适应旋转方法精度高,计算速度快,能满足橡胶栓实时检测的要求。 相似文献
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针对某工厂以人工方式检测饰品盒表面质量,存在检测效率低、误检及漏检率高等问题,开发了饰品盒表面质量自动检测系统。该系统利用模板匹配方法实现对表面图像的判别,进而根据判别结果来控制系统的设备动作,实现对饰品盒的分类堆放。通过实践检测证明,该系统能够大幅提高产品的检测速度、极大地降低产品的误检率和漏检率,同时也降低了企业的成本。 相似文献
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具有重复图案阵列的IC在整个芯片中占有较大的比例,针对此类IC的结构特征,提出一种基于旋转不变子空间技术(ESPRIT)算法的自比较模板匹配缺陷检测方法。首先应用ESPRIT算法精确计算出重复图案中结构块的大小,然后将图像中所有结构块对应位置的像素值平均,计算出标准结构块。再根据显微镜视野大小将标准结构块进行扩展形成标准模板,通过比对实现缺陷检测。试验结果表明:采用ESPRIT算法求取结构块大小,具有较高的速度和精度,能够满足IC检测实时性要求。算法的计算复杂度为O(N的3/2次方) ,精度可以达到0.04个像素。 相似文献