共查询到19条相似文献,搜索用时 203 毫秒
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一种实用的ROI区域实时搜索方法 总被引:1,自引:0,他引:1
在开发某企业半导体芯片外观视觉检测项目中,针对搜索ROI区域时,由于待测芯片的倾斜而导致搜索存在偏差甚至错误的问题,实现了一种运用特征小模板对倾斜图像进行匹配和角 度计算并校正图像的方法.利用特征小模板对小角度倾斜不敏感的性质,在半导体的视觉检测 应用中,通过两个小模板的匹配结果对待检测芯片图像进行倾斜校正,然后再进行ROI区域搜 索.在执行时间增加很小的情况下显著提高了精度,保证了后续的各项外观参数检测的实时、准 确与可靠性能.该方法已成功应用在某企业半导体芯片外观视觉检测中,实际运行表明此方法是可靠和成功的. 相似文献
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球栅阵列(Ball Grid Array,BGA)封装具有体积小、引脚密度高、信号完整性和散热性能佳等优点,因而广泛应用于大规模集成电路的封装领域。植球工艺作为BGA封装(连接器)生产中的关键工艺会直接影响器件与电路的性能及可靠性,现从植球工艺路线、BGA连接器设计要求、植球工艺参数及关键技术、试验及检测要求等几个方面,阐述了影响BGA连接器植球工艺实现的各种因素,借以提高BGA连接器产品的可靠性及稳定性。 相似文献
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针对汽车车架纵梁在线检测系统中序列图像的自动拼接问题,提出了一种稳健、快速、精确的自动拼接算法.利用基于特征的算法提取特征区域,并在待匹配模板中确定候选模块,考察序列图像间的运动特点,将搜索限制在一个小范围内,利用基于像素的方法在此范围内确定候选模块中的真实匹配块.此方法在满足图像拼接精度的前提下,大幅度提高了拼接速度. 相似文献
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提出了基于IMAQ的模板匹配的零件检测方法,叙述了对图像进行预处理、确定零件的特征区域和设置最小分值,实现了零件的匹配和检测。实验过程表明,应用模板匹配对零件检测可以取得预期的结果。 相似文献
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提出了基于IMAQ的模板匹配的零件检测方法,叙述了对图像进行预处理、确定零件的特征区l域和设置最小分值,实现了零件的匹配和检测。实验过程表明,应用模板匹配对零件检测可以取得预期的结果。 相似文献
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针对叶型孔四坐标视觉测量系统中成像视场的局限性问题,提出基于模板匹配法的背向照明图像拼接方法,用于将采集到的多幅叶型孔局部图像拼接成全景图像。建立图像拼接算法的数学模型并进行模型简化,采用模板匹配法计算模型中平移量参数。在应用过程中,先按照规划图像采集策略由成像装置采集被测叶型孔的多幅局部背向照明图像,而后选取模板并通过模板与待拼接图像之间的对比与遍历确定最佳匹配位置,从而获取拼接矩阵。为了验证所提出的图像拼接方法,应用该测量系统对静子组件外环上分布的目标叶型孔特征进行视觉测量,获得其全景图像和相应的型面轮廓参数测量结果,从而验证了叶型孔背向照明图像拼接方法的可行性和有效性。 相似文献
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A Rotation-Invariant and Non-Referential Approach for Ball Grid Array (BGA) Substrate Conducting Path Inspection 总被引:2,自引:2,他引:0
C.-H. Yeh D.-M. Tsai 《The International Journal of Advanced Manufacturing Technology》2001,17(6):412-424
The aim of this paper is to locate and classify boundary defects such as open and short circuits, mousebites, and spurs on
ball grid array (BGA) substrate conducting paths using machine vision. Boundary defects are detected by a boundary-based corner
detection method using covariance matrix eigen-values. Detected defects are then classified by discrimination rules derived
from variation patterns of eigenvalues and the geometrical shape of each defect type. Real BGA substrates with both synthetic
and real boundary defects are used as test samples to evaluate the performance of the proposed method. Experimental results
show that the proposed method achieves 100% correct identification for BGA substrate boundary defects under a sufficient image
resolution. The proposed method is invariant with respect to the orientation of the BGA substrates, and it does not require
prestored templates for matching. This method is suitable for various types of BGA substrate in small-batch production because
precise positioning of BGA substrates and the prestored templates are not necessary. 相似文献
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H.-N. Yen D.-M. Tsai 《The International Journal of Advanced Manufacturing Technology》2004,24(1-2):132-139
Ball-Grid-Array (BGA) has become one of the most popular packaging techniques in the electronics industry. Coplanarity inspection of BGA solder balls is critical for process and quality control in BGA manufacturing. Currently, the 3D measurement systems for BGA coplanarity inspection are mainly based on laser scanning techniques. However, they suffer from low inspection speed due to the physical line-scanning process. In this paper, a fast and cost-effective 3D measurement system for coplanarity inspection of BGA solder balls is proposed. The proposed system uses an LCD-based phase measuring technique to perform full-field 3D measurement of BGA solder balls with high accuracy. Experiments have shown that the coplanarity measurement of BGA solder balls is very efficient and effective with the proposed system. The measurement repeatability is in the micrometer range. The processing time of the proposed 3D measurement system for an image of 640×480 pixels is less than 2 s on a typical personal computer. 相似文献
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C.-H. Yeh 《The International Journal of Advanced Manufacturing Technology》2003,21(3):223-233
This paper presents a novel approach for localising open and short boundary defect candidates on ball grid array (BGA) substrate
conducting paths by using a 2D wavelet transform (2D WT). Once the potential defects are identified, traditional printed circuit
board (PCB) inspection algorithms can focus on these candidates for further analysis to identify true open and short defects.
The defect-detecting scope and the inspection effort are thereby significantly reduced. The binary BGA substrate image is
processed. It shows only the boundaries of BGA substrate conducting paths, which are further decomposed directly by 2D WT.
Since most of the wavelet energy is clustered at the edges of image objects, the wavelet transform modulus sum (WTMS) of each
edge pixel on BGA substrate conducting path boundaries is initially collected. By comparing the WTMS of an edge pixel on decomposition
level j with its WTMS on an adjacent decomposition level j + 1, an across-level ratio can be estimated to verify the irregularity of an edge pixel. That is, an edge pixel is classified
as strongly irregular (e.g. potential open or short defects) if its across-level ratio reaches a predefined threshold. The
proposed approach is template-free and easy to implement, so it is suitable for small-batch production. Real BGA substrates
with synthetic boundary defects are used as test samples to evaluate the performance of the proposed approach. Experimental
results show that the proposed method is capable of capturing all the open and short defects on BGA substrate conducting paths
without missing any errors by using a selected across-level ratio threshold and appropriate decomposition level. 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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针对现有基于深度学习的图像分割算法在球栅阵列(BGA)焊点气泡检测中检测效率较低,无法满足工业生产中实时性的检测需求,提出了一种基于改进U-Net的球栅阵列缺陷识别方法。该方法在现有的U-Net经典网络的基础上提出用深度可分离卷积与密集连接结合的轻量密集连接单元替换常规的卷积单元,同时添加多尺度跳跃连接减少编解码特征之间的差异,实现针对BGA焊点气泡的精确分割和提取。采用自建数据集对该方法的有效性进行实验,结果表明,改进的U-Net模型网络在减少U-Net网络计算复杂度的同时提升了网络性能,能够增加BGA焊点气泡的检测效率。 相似文献
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图像处理系统在自动化设备中用作位置反馈的一种方法 总被引:2,自引:0,他引:2
在自动化设备中采用图像处理系统做位置反馈,保证了系统位置精度,系统成本低、使用方便。改进了模板匹配的算法,使处理速度大幅提高。 相似文献