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Rotation Scaling and Translation Invariants of 3D Radial Shifted Legendre Moments 被引量:1
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作者 Mostafa El Mallahi Jaouad E1Mekkaoui +2 位作者 Areal Zouhri Hicham Amakdouf Hassan Qjidaa 《International Journal of Automation and computing》 EI CSCD 2018年第2期169-180,共12页
This paper proposes a new set of 3D rotation scaling and translation invariants of 3D radially shifted Legendre moments. We aim to develop two kinds of transformed shifted Legendre moments: a 3D substituted radial sh... This paper proposes a new set of 3D rotation scaling and translation invariants of 3D radially shifted Legendre moments. We aim to develop two kinds of transformed shifted Legendre moments: a 3D substituted radial shifted Legendre moments (3DSRSLMs) and a 3D weighted radial one (3DWRSLMs). Both are centered on two types of polynomials. In the first case, a new 3D ra- dial complex moment is proposed. In the second case, new 3D substituted/weighted radial shifted Legendremoments (3DSRSLMs/3DWRSLMs) are introduced using a spherical representation of volumetric image. 3D invariants as derived from the sug- gested 3D radial shifted Legendre moments will appear in the third case. To confirm the proposed approach, we have resolved three is- sues. To confirm the proposed approach, we have resolved three issues: rotation, scaling and translation invariants. The result of experi- ments shows that the 3DSRSLMs and 3DWRSLMs have done better than the 3D radial complex moments with and without noise. Sim- ultaneously, the reconstruction converges rapidly to the original image using 3D radial 3DSRSLMs and 3DWRSLMs, and the test of 3D images are clearly recognized from a set of images that are available in Princeton shape benchmark (PSB) database for 3D image. 展开更多
关键词 3D radial complex moments 3D radial shifted Legendre radial moments radial shifted Legendre polynomials 3D imagereconstruction 3D rotation scaling translation invariants 3D image recognition computational complexities.
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Differences in Male Climacteric Symptoms and Lifestyle Depending on the Duration of Working among Rotating Night Shift Workers
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作者 Sachiko Kubo Toshiyuki Yasui +2 位作者 Reiko Okahisa Yukie Matsuura Masahito Tomotake 《Health》 2020年第12期1598-1609,共12页
<strong>Background:</strong> There are various health problems in rotating shift workers. There have been few studies on the associations of male climacteric symptoms with duration of working and lifestyle... <strong>Background:</strong> There are various health problems in rotating shift workers. There have been few studies on the associations of male climacteric symptoms with duration of working and lifestyle. <strong>Objective: </strong>The aim of this study was to determine the differences in male climacteric symptoms depending on the number of working years and to determine whether lifestyle habits differ depending on the number of working years in rotating shift workers. <strong>Methods:</strong> We collected participant’s data from the manufacturing companies in Japan during the period from March to May in 2017. We conducted a self-administered questionnaire survey in 1561 male rotating night shift workers. Male climacteric symptoms were evaluated by using the Aging Males’ Symptoms (AMS) rating scale. We analyzed 636 rotating shift workers aged over 40 years old whose all AMS data was collected. <strong>Results:</strong> A significant difference in psychological AMS score was found between men who had worked for 10 - 19 years (9.4 ± 3.9) and men who had worked for more than 40 years (7.6 ± 3.0) (p = 0.011). Sexual functional AMS score significantly differed depending on the number of working years (less than 10 years: 8.1 ± 3.9, 10 - 19 years: 9.8 ± 4.1, 20 - 29 years: 7.9 ± 3.3, 30 - 39 years: 9.3 ± 3.5, more than 40 years: 9.3 ± 3.5) (p < 0.001). The proportion of workers with a balanced meal intake was significantly lower in men who had worked for less than 10 years and the proportions of such workers were significantly higher in men who had worked for 10 - 19 years and for more than 40 years. The proportions of men who did not drink alcohol were high in men who had worked for less than 10 years and 20 - 29 years and low in men who had worked more than 30 years. <strong>Conclusion: </strong>Psychological AMS score and sexual functional AMS score are significantly different among the 5 groups according to the number of working years on rotating shift. In addition, well-balanced diet on day shift and reduction of alcohol drinking is a related-factor for long-term rotating night shift workers. 展开更多
关键词 rotating Night shift Workers Male Climacteric Symptoms Aging Male’s Symptoms Rating scale Occupational Health Lifestyle Habit
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相对边界矩在模式识别中的应用 被引量:8
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作者 李丽宏 苗敬利 +1 位作者 王静爽 安庆宾 《微计算机信息》 北大核心 2005年第07X期42-43,共2页
针对采用图像二维不变矩识别目标形状时,计算量大,耗费时间长的缺点,本文提出了相对边界矩算法,这种算法是利用目标物体的边界进行识别的,所以不仅计算速度快而且在离散状态下也具有平移、旋转和比例因子不变性,实验证明,此方法是一种... 针对采用图像二维不变矩识别目标形状时,计算量大,耗费时间长的缺点,本文提出了相对边界矩算法,这种算法是利用目标物体的边界进行识别的,所以不仅计算速度快而且在离散状态下也具有平移、旋转和比例因子不变性,实验证明,此方法是一种快速的行之有效的方法。 展开更多
关键词 边界矩 平移、旋转和比例不变性 模式识别
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基于最优移位双线性插值的图像缩放旋转硬件加速研究 被引量:3
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作者 丁家隆 杜慧敏 +2 位作者 曹广界 王鹏超 杜琴琴 《微电子学与计算机》 CSCD 北大核心 2016年第7期115-120,124,共7页
针对最优双线性插值算法进行精度优化,采用ARM A9处理器软件定点实现比浮点提高13.5倍处理速度.并提出一种高效的硬件实现结构,在Xilinx Zedboard开发板上验证了该结构,实验结果表明:在典型情况下可以比ARM A9软件定点实现提高9倍速度.
关键词 图像缩放 图像旋转 最优移位双线性插值 硬件加速
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基于TSMRFDE和随机森林的旋转机械故障诊断 被引量:3
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作者 宋来建 王晓甜 吴彬彬 《组合机床与自动化加工技术》 北大核心 2022年第8期125-129,共5页
为高效检测旋转机械的故障类型和严重程度,提出了一种具有优异泛化性的旋转机械故障诊断方法。首先,基于反向波动散布熵和时移粗粒化处理,开发了一种新的测量时间序列复杂度的方法,称为时移多尺度反向波动散布熵(TSMRFDE);其次,采用t-... 为高效检测旋转机械的故障类型和严重程度,提出了一种具有优异泛化性的旋转机械故障诊断方法。首先,基于反向波动散布熵和时移粗粒化处理,开发了一种新的测量时间序列复杂度的方法,称为时移多尺度反向波动散布熵(TSMRFDE);其次,采用t-随机领域嵌入(t-SNE)对TSMRFDE进行流形降维,减小特征的冗余;最后,将低维故障特征输入至随机森林(RF)分类器进行故障识别。实验结果表明,TSMRFDE-t-SNE-RF在不同平台的实验中都取得了优异的故障识别结果,平均识别准确率分别达到了100%和97.9%,验证了该方法的泛化性和稳定性。 展开更多
关键词 时移多尺度反向波动散布熵 t-SNE 随机森林 旋转机械 故障诊断
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基于链码和快速傅里叶变换的轮廓描绘方法 被引量:5
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作者 牛庆肖 张桦 +1 位作者 徐光平 薛彦兵 《光电子.激光》 EI CAS CSCD 北大核心 2011年第12期1857-1861,共5页
将八方向链码和快速傅里叶变换(FFT)相结合,提出一种新的形状轮廓描述方法。通过链码按顺序搜索物体边界,根据链码值的投影变换与轮廓的关系构造出轮廓的链码函数,对链码函数进行快速FFT,并对傅里叶描述符进行优化,提出了新的傅里叶不... 将八方向链码和快速傅里叶变换(FFT)相结合,提出一种新的形状轮廓描述方法。通过链码按顺序搜索物体边界,根据链码值的投影变换与轮廓的关系构造出轮廓的链码函数,对链码函数进行快速FFT,并对傅里叶描述符进行优化,提出了新的傅里叶不变因子描述符(FCFD)。实验结果表明,本文提出FCFD具有旋转、尺度和平移(RSS)不变性和初始点无关性,并且降低了运算量,有效提高了数据处理速率。 展开更多
关键词 链码 轮廓 快速傅里叶变换(FFT) 旋转 尺度和平移(rss) 傅里叶常数因子描述符(FCFD)
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