共查询到18条相似文献,搜索用时 31 毫秒
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基于面阵CCD的振动非接触测量 总被引:3,自引:0,他引:3
介绍了基于面阵CCD的振动非接触测量系统的原理和结构。对系统参数的确定方法和系统所采集的序列运动图像的处理方法进行了分析。并通过实验验证了系统的可靠性 相似文献
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应用概率论提高CCD尺寸测量的分辨力 总被引:4,自引:2,他引:4
CCD 尺寸测量直接采用脉冲计数法的主要缺点是分辨力差。本文提出一种基于概率论的动态多周期采样平均测量法,可以使测量分辨力提高一个数量级,从而使测量精度显著的提高。本文论述了测量原理及方法,介绍了实验结果。 相似文献
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提高CCD尺寸测量分辨力的解调测量法 总被引:26,自引:6,他引:20
CCD尺寸测量普遍采用脉冲计数法,即一个脉冲代表一个光敏元间距,为了提高测量的固有分辨力,Purll,D.C.提出了解调测量的设想。本文对此方法进行了理论分析并提出了工程实现方法,最后介绍了采用这一方法的实验结果。 相似文献
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图像测量中快速边缘亚像素定位研究 总被引:4,自引:1,他引:4
研究了一种图像测量中边缘点的快速亚像素定位的方法,采用先阈值分割再边缘提取进行粗定位,确定边缘点的像素级精度位置和边缘的方向,沿边缘点的边缘方向拓展像素,得到一定长度的灰度值向量,对向量进行处理实现边缘的亚像素定位。分别采用三次多项式拟合法、二次曲线拟合法和灰度矩法三种亚像素定位算法进行了理论分析和实验对比,结果表明,灰度矩算法具有较短的运行时间和较高的定位精度。 相似文献
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将信息熵引入到图像的边缘检测中,利用数据Gap统计方法的思想,提出了熵差的概念,建立了一种基于熵差的二值图像边缘检测模型,给出了边缘检测的算法,并通过图像边缘检测实例,与经典的sobel边缘检测法进行了比较。 相似文献
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将数字图像处理理论与算法应用到超声成像系统,对超声C扫描图像进行滤波和边缘增强,提高了图像的质量,为准确、可靠地识别缺陷奠定了基础。 相似文献
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Identifying the situation of grinding wheel wear and loading is a very important issue for high efficiency grinding operations.
This paper presents a new method that detects and identifies the chip loading and cutting edge wear of a grinding wheel using
the image processing toolbox of MATLAB. The different optical characters of the metal chips and the abrasive grains are analysed.
The Sobel operator is adopted to make edge detection. A sensitivity threshold based on the global condition is used to decrease
the noise. Image dilation and erosion processes are used to ensure the edge of each loaded chip is covered by a continuous
section. The ratios of chips are calculated and displayed to monitor the wheel surface working status. 相似文献
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Z. Feng X. Chen 《The International Journal of Advanced Manufacturing Technology》2007,32(5-6):452-458
Identifying the situation of grinding wheel wear and loading is a very important issue for high-efficiency grinding operations.
This paper presents a new method that detects and identifies the chip loading and cutting edge wear of a grinding wheel using
the image processing toolbox of the MATLAB package. The different optical characters of the metal chips and the abrasive grains
are analysed. The Sobel operator is adopted to make the edge detections. A sensitivity threshold based on the global condition
is used to lower the noise. Image dilation and erosion processes are used to ensure that the edge of each loaded chip is covered
by a continuous section. The ratios of chips are calculated and displayed to monitor the wheel surface working status. 相似文献
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Dr Tung-Hsu Hou Wen-Liang Kuo 《The International Journal of Advanced Manufacturing Technology》1997,13(6):407-412
This paper presents a new edge-detection method which, based on simple arithmetic and logical operations, consists of three procedures: image binarisation, image contraction, and image subtraction. Experiments showed that the proposed algorithm could generate a path one pixel wide with continuous edges, and the proposed algorithm had a better edge-detection accuracy than the 4-connected, 8-connected, and the Sobel techniques. Therefore, the proposed edge-detection algorithm is feasible for use in automatic visual inspection systems. 相似文献