共查询到17条相似文献,搜索用时 156 毫秒
1.
一种尺度自适应Canny边缘检测方法 总被引:6,自引:1,他引:5
作为最优边缘检测算子,Canny算子在线性滤波及选取阈值方面具有一定的局限性.在其基础上,采用尺度可变的自适应高斯滤波器进行滤波,通过计算滤波器各滤波窗口内像素点灰度值的均值,以及该均值与当前像素点灰度值的差值,确定滤波窗口的平滑度,并将其作为高斯函数尺度的大小,在滤除噪声的同时确保了边缘信号不被平滑掉;同时采用基于简单统计法及梯度阚值法的双阈值分割方法检测经过非极大值抑制的梯度幅值图像的边缘.实验结果表明,该方法能够有效滤除噪声,且假边缘及丢失边缘的数量都比Canny边缘检测的少. 相似文献
2.
3.
4.
5.
6.
7.
8.
目的设计贴片电阻方向检测系统,以解决当前贴片电阻排序编带过程中存在的检测效率低和检测精度低等问题。方法采用改进的基于形状的模板匹配算法,以机器视觉软件Halcon为平台,利用Canny边缘检测算子和Sobel算子进行边缘检测和滤波,生成模板图像的边缘点位置向量和梯度向量,并以模板边缘点与图像搜索区域的对应点的内积和作为相似度量,进行模板匹配。结果检测系统的识别时间为33 ms,同时其平均识别准确率达99.5%以上,相比于传统人工检测有较大提高。结论该系统具有良好的速度和准确度,可满足工业生产要求。 相似文献
9.
10.
11.
基于图像识别的铝塑包装材料边缘检测 总被引:1,自引:1,他引:0
目的为了提高铝塑类包装材料的边缘检测精度,基于图像识别技术设计一种边缘检测方法。方法介绍Canny边缘检测算法,针对其双阈值选择比较困难、边缘检测精度不高等问题,利用Ostu算法实现高、低阈值的选取。基于FPGA(现场可编程门阵列)和DSP(数字信号处理器)搭建一种图像检测系统,并给出系统框图及FPGA内部结构,即异步FIFO模块、串入并出模块、像素窗口刷新模块、数据处理模块以及配套电路等,并以药品铝塑泡罩包装为例进行实验研究。结果改进的Canny算法在保证处理速度的前提下,所检测图像清晰细致,能够得到完整边缘。结论该方法具有准确度高、稳定可靠、识别速度快等特点,可满足包装过程产品检测要求。 相似文献
12.
《成像科学杂志》2013,61(6):332-341
AbstractThe Canny edge detection algorithm contains a number of adjustable parameters, which can affect the computation time and effectiveness of the algorithm. To overcome the shortages, this paper proposes a new way to determine the adjustable parameters and constructs a modified Canny edge detection algorithm. In the algorithm, an image is firstly smoothed by an adaptive filter that is selected based on the properties of the image, instead of a fixed sized Gaussian filter, and then, the high and low thresholds for the gradient magnitude image are determined based on maximum cross-entropy between inter-classes and Bayesian judgment theory, without any manual operation; finally, if it needs, the object closing procedure is carried out. To test and evaluate the algorithm, a number of different images are tested and analysed, and the test results are discussed. The experiments show that the studied algorithm can achieve the better edge detection results in most of the cases, and it is also useful for object boundary closing as a pre-segmentation step. 相似文献
13.
14.
15.
Koushlendra Kumar Singh Rajesh K. Pandey Prabhat Munshi 《Research in Nondestructive Evaluation》2017,28(3):150-167
Non invasive feature detection in wood based application requires exact discrimination between geometrical edges and texture. It has been found that traditional edge detection algorithms are highly sensitive to noise and texture and produces inferior results with wood. The present work encompasses a micro level reconstruction of Palash and Rosewood by using micro X-rays CT scanner. It also encompasses a new edge detection algorithm using newly constructed Chebyshev polynomial based fractional order differentiator. Transform based method has been used for reconstruction purpose. Newly designed fractional order filter has been applied on these reconstructed images. Chebyshev polynomial based fractional order differentiator has been used for filtering operation. Quadrature Mirror Filter (QMF) concept has been used for design of high pass filter and low pass filter. Preprocessing has been performed by using this filter. Canny edge detection algorithm has been used on this preprocessed image. The algorithm has been tested on two different test cases of wood images a) Palash and b) Rosewood. The effect of relaxation coefficient has also been presented and discussed. 相似文献
16.
基于改进的Hough变换缸套内面网纹夹角检测 总被引:1,自引:1,他引:0
目的缸套内面网纹角是影响缸套性能的重要参数,为了在生产过程中快速准确检测出网纹角参数,剔除不合格产品,研究基于改进的Hough变换缸套内面网纹夹角检测方法。方法确定缸套图像的预处理算法,增强图像网纹特征,滤除次要信息;确定基于Canny算子的网纹特征边缘分割方法;确定基于改进的Hough变换网纹直线特征提取方法,通过计算提取直线夹角的平均值得到缸套网纹角值。结果试验表明,基于改进的Hough变换网纹角检测结果与进口仪器检测结果相比,平均误差为1.54%,检测精度高。结论提出的检测算法可准确识别缸套内表面网纹角,能很好地代替传统人工复膜检测和昂贵的进口检测仪器,满足工业现场自动检测的需要,提高了检测的效率和精度,降低了检测成本。 相似文献
17.
基于Canny算法的啤酒空瓶杂质检测方法 总被引:3,自引:3,他引:0
通过利用CCD传感器获取啤酒空瓶图像,对图像进行预处理,用最大类间方差法确定Canny算法的门限值,能够实现基于Canny算法的啤酒空瓶杂质检测.把Canny算法引入到啤酒空瓶杂质检测过程中,并结合试验验证了杂质检测的可行性.利用Canny算法提高了杂质检测的准确性,有助于啤酒瓶在线自动检测的进一步发展. 相似文献