为了提高道路双黄线的检测精度和速度,提出了一种基于快速多重信号分类(Multiple Signal Classification,MUSIC)算法的直线检测方法。首先对道路双黄线图像进行分割和边缘提取,得到二值图像,然后转换成虚拟传感器阵列的多快拍信号,再通...为了提高道路双黄线的检测精度和速度,提出了一种基于快速多重信号分类(Multiple Signal Classification,MUSIC)算法的直线检测方法。首先对道路双黄线图像进行分割和边缘提取,得到二值图像,然后转换成虚拟传感器阵列的多快拍信号,再通过构建远场信号模型和近场信号模型,将直线的倾斜角和偏移量检测问题转变为波达方向估计(Direction of Arrival,DOA)问题。最后通过分别划分两次网格,利用MUSIC算法对直线的倾斜角和偏移量进行搜索,从而求得所有直线的倾斜角和偏移量。实验结果表明,本文所提方法能够快速准确地检测出道路双黄线边缘的倾斜角和偏移量,对于自动驾驶技术具有重要的意义。展开更多
开车时记得看“薯条”疫情期间,挪威麦当劳40%左右的单子都是通过drive-thru的方式,由顾客开车取得。但开车回家的路上,总会忍不住先吃一点,特别是诱人的炸薯条。麦当劳最近发布了一个名为“Eyes on the fries”的campaign,提高人们对...开车时记得看“薯条”疫情期间,挪威麦当劳40%左右的单子都是通过drive-thru的方式,由顾客开车取得。但开车回家的路上,总会忍不住先吃一点,特别是诱人的炸薯条。麦当劳最近发布了一个名为“Eyes on the fries”的campaign,提高人们对分心驾驶的重视。但这里的薯条并不是麦当劳的薯条,而是路上的“薯条”--单黄线和双黄线。展开更多
The present study investigated conditions for inducing mito-gynogenetic(endomitosis) diploids by hydrostatic pressure in the large yellow croaker Pseudosciaena crocea.In haploid control groups,the development of eggs ...The present study investigated conditions for inducing mito-gynogenetic(endomitosis) diploids by hydrostatic pressure in the large yellow croaker Pseudosciaena crocea.In haploid control groups,the development of eggs was activated with ultraviolet radiated semen.All fry presented typical haploid syndrome in the haploid control groups,and were verified as haploids using cytometry.After hydrostatic pressure treatment,morphologically normal fry reappeared at different frequencies according to the intensity and time of pressure shock.Fry with normal appearance in the pressure treated groups were verified as gynogenetic double haploids(GDHs),containing only one allele from the female parent at all four diagnostic microsatellite loci.For a fixed duration of 3 min,the optimal intensity of blocking the first mitosis was determined to be 40 Mpa,which was similar to that of blocking the second meiosis.There was a "window" of starting time,from 36.1 min to 38.1 min post-insemination at 25.0±1.0°C,within which the production of GDHs was not significantly different.Maximum production of morphologically normal fries,9.36%±2.97% of developed eggs,was found when the eggs were shocked with hydrostatic pressure at 40 Mpa for 3 min,starting from 38.1 min post insemination at 25.0±1.0°C.展开更多
文摘为了提高道路双黄线的检测精度和速度,提出了一种基于快速多重信号分类(Multiple Signal Classification,MUSIC)算法的直线检测方法。首先对道路双黄线图像进行分割和边缘提取,得到二值图像,然后转换成虚拟传感器阵列的多快拍信号,再通过构建远场信号模型和近场信号模型,将直线的倾斜角和偏移量检测问题转变为波达方向估计(Direction of Arrival,DOA)问题。最后通过分别划分两次网格,利用MUSIC算法对直线的倾斜角和偏移量进行搜索,从而求得所有直线的倾斜角和偏移量。实验结果表明,本文所提方法能够快速准确地检测出道路双黄线边缘的倾斜角和偏移量,对于自动驾驶技术具有重要的意义。
文摘开车时记得看“薯条”疫情期间,挪威麦当劳40%左右的单子都是通过drive-thru的方式,由顾客开车取得。但开车回家的路上,总会忍不住先吃一点,特别是诱人的炸薯条。麦当劳最近发布了一个名为“Eyes on the fries”的campaign,提高人们对分心驾驶的重视。但这里的薯条并不是麦当劳的薯条,而是路上的“薯条”--单黄线和双黄线。
基金Supported by the National High Technology Research and Development Program of China(863 Program)(No.2006AA10A405)the Foundation for Innovative Research Team of Jimei University(No.2006A001),the Science Foundation of Jimei University(No.ZQ2006037)
文摘The present study investigated conditions for inducing mito-gynogenetic(endomitosis) diploids by hydrostatic pressure in the large yellow croaker Pseudosciaena crocea.In haploid control groups,the development of eggs was activated with ultraviolet radiated semen.All fry presented typical haploid syndrome in the haploid control groups,and were verified as haploids using cytometry.After hydrostatic pressure treatment,morphologically normal fry reappeared at different frequencies according to the intensity and time of pressure shock.Fry with normal appearance in the pressure treated groups were verified as gynogenetic double haploids(GDHs),containing only one allele from the female parent at all four diagnostic microsatellite loci.For a fixed duration of 3 min,the optimal intensity of blocking the first mitosis was determined to be 40 Mpa,which was similar to that of blocking the second meiosis.There was a "window" of starting time,from 36.1 min to 38.1 min post-insemination at 25.0±1.0°C,within which the production of GDHs was not significantly different.Maximum production of morphologically normal fries,9.36%±2.97% of developed eggs,was found when the eggs were shocked with hydrostatic pressure at 40 Mpa for 3 min,starting from 38.1 min post insemination at 25.0±1.0°C.
