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基于傅里叶特征谱和相关系数的织物疵点检测 被引量:23
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作者 朱丹丹 潘如如 高卫东 《计算机工程与应用》 CSCD 2014年第19期182-186,198,共6页
为提高织物疵点自动检测的准确度,提出一种基于傅里叶特征谱和相关系数的织物疵点检测算法。以平纹、斜纹织物为研究对象,对织物图像进行傅里叶变换,得到织物图像的频谱图;定位频谱中的特征峰点,提取表征图像灰度、纹理的五个特征值;以... 为提高织物疵点自动检测的准确度,提出一种基于傅里叶特征谱和相关系数的织物疵点检测算法。以平纹、斜纹织物为研究对象,对织物图像进行傅里叶变换,得到织物图像的频谱图;定位频谱中的特征峰点,提取表征图像灰度、纹理的五个特征值;以正常织物为模板,计算待检图像特征值与模板图像特征值之间的相关系数,确定用于识别织物疵点的阈值,来实现织物疵点检测。实验结果表明:当阈值设定为0.80时,该算法能够实现稀密路、断经、吊经、纬缩、破洞等常见疵点的准确检测。 展开更多
关键词 织物图像 傅里叶特征谱 相关系数 疵点检测
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Study on the Method for Obtaining Acceleration Waveform Records from Velocity Type Seismograms of the Digital Seismograph Network
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作者 YaoLanyu NieYongan ZhaoJinghua BianZhenfu 《Earthquake Research in China》 2004年第3期234-241,共8页
The authors proposed a method for obtaining high-quality acceleration seismograms from velocity type seismograms of digital Seismographic network, and took as an example the analysis and processing of the seismograms ... The authors proposed a method for obtaining high-quality acceleration seismograms from velocity type seismograms of digital Seismographic network, and took as an example the analysis and processing of the seismograms of a same earthquake that was simultaneously recorded by velocity seismograph CTS1-EDAS24 and strong motion seismograph EST-Q4128 installed in Jixian Station, Tianjin. The calculation steps and the processing method have been discussed in detail. From the analysis and the comparison of the obtained results, it is concluded that the proposed method is simple and effective, and it broadens the application of digital seismographic network. 展开更多
关键词 Seismographic network Seismograph characteristics Velocity record Acceleration record Acceleration response spectra Fourier spectra
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