为处理好手指静脉识别技术中旋转、偏移以及光照不均等难题,将Gabor滤波与对比度受限的自适应直方图均衡算法相结合来进行图像增强,并利用静脉图像的反射率进行图像分割,同时检测静脉图像中的加速鲁棒特征(Speeded Up Robust Features,S...为处理好手指静脉识别技术中旋转、偏移以及光照不均等难题,将Gabor滤波与对比度受限的自适应直方图均衡算法相结合来进行图像增强,并利用静脉图像的反射率进行图像分割,同时检测静脉图像中的加速鲁棒特征(Speeded Up Robust Features,SURF),然后根据SURF特征点在分割图像中的空间分布特征进行特征点约束,最后利用图像中特征点的相似性进行图像识别。在公开手指静脉数据库上的实验结果表明,所提方法不仅识别率较高,而且对手指静脉图像在采集过程中存在的手指旋转、偏移以及图像光照不均等问题有较好鲁棒性。展开更多
The activity levels of long-lived radionuclides in minerals have received more and more concern for the public health. The inductively coupled plasma mass spectrometry was used to measure the content of uranium and th...The activity levels of long-lived radionuclides in minerals have received more and more concern for the public health. The inductively coupled plasma mass spectrometry was used to measure the content of uranium and thorium in 60 mineral samples collected from 16 mines of seven provinces in China. The contents of uranium and thorium ranged0.17 ± 0.04 lg g^(-1)to 15.3 ± 2.39 lg g^(-1), and 0.19 ± 0.04 lg g^(-1)to 19.6 ± 7.56 lg g^(-1), respectively. The highest levels of U and Th contents were found in aluminum ore,whereas the lowest was found in antimony and copper ores.展开更多
文摘为处理好手指静脉识别技术中旋转、偏移以及光照不均等难题,将Gabor滤波与对比度受限的自适应直方图均衡算法相结合来进行图像增强,并利用静脉图像的反射率进行图像分割,同时检测静脉图像中的加速鲁棒特征(Speeded Up Robust Features,SURF),然后根据SURF特征点在分割图像中的空间分布特征进行特征点约束,最后利用图像中特征点的相似性进行图像识别。在公开手指静脉数据库上的实验结果表明,所提方法不仅识别率较高,而且对手指静脉图像在采集过程中存在的手指旋转、偏移以及图像光照不均等问题有较好鲁棒性。
基金financial support by the Chinese Ministry of Science and Technology (Grant Nos. 2005DIB1J087, 2013BAK03B00)
文摘The activity levels of long-lived radionuclides in minerals have received more and more concern for the public health. The inductively coupled plasma mass spectrometry was used to measure the content of uranium and thorium in 60 mineral samples collected from 16 mines of seven provinces in China. The contents of uranium and thorium ranged0.17 ± 0.04 lg g^(-1)to 15.3 ± 2.39 lg g^(-1), and 0.19 ± 0.04 lg g^(-1)to 19.6 ± 7.56 lg g^(-1), respectively. The highest levels of U and Th contents were found in aluminum ore,whereas the lowest was found in antimony and copper ores.
