We proposed an enhanced image binarization method.The proposed solution incorporates Monte-Carlo simulation into the local thresholding method to address the essential issues with respect to complex background,spatial...We proposed an enhanced image binarization method.The proposed solution incorporates Monte-Carlo simulation into the local thresholding method to address the essential issues with respect to complex background,spatially-changed illumination,and uncertainties of block size in traditional method.The proposed method first partitions the image into square blocks that reflect local characteristics of the image.After image partitioning,each block is binarized using Otsu’s thresholding method.To minimize the influence of the block size and the boundary effect,we incorporate Monte-Carlo simulation into the binarization algorithm.Iterative calculation with varying block sizes during Monte-Carlo simulation generates a probability map,which illustrates the probability of each pixel classified as foreground.By setting a probability threshold,and separating foreground and background of the source image,the final binary image can be obtained.The described method has been tested by benchmark tests.Results demonstrate that the proposed method performs well in dealing with the complex background and illumination condition.展开更多
从SMARTS(The Small and Moderate Aperture Research Telescope System)数据库,收集到了平谱射电类星体(FRSQ)0208-512天体光学波段B、V、R的观测数据,数据从2008年2月–2017年8月,时间跨度近10 yr.分别获得了光学B波段数据627组、V波...从SMARTS(The Small and Moderate Aperture Research Telescope System)数据库,收集到了平谱射电类星体(FRSQ)0208-512天体光学波段B、V、R的观测数据,数据从2008年2月–2017年8月,时间跨度近10 yr.分别获得了光学B波段数据627组、V波段数据634组、R波段数据639组.通过加权小波Z变换法(WWZ)和蒙特卡洛模拟的LombScargle periodogram(LSP)方法研究得出了如下结论:(1)在两种方法中都得到了光学B、V、R 3个波段有可能存在396 d左右约为1.08 yr的周期性光变;(2)得到了B波段星等B与光学波段色指数(B-V)呈正相关关系,当B星等越小时色指数(B-V)越小,即越亮越蓝;(3)通过光学3个波段的1.08 yr的长周期光变得到天体中心黑洞质量M约为0.12×10^(6)M⊙,辐射区半径RM=1.052×10^(8)km,其中M⊙为太阳质量.展开更多
基金Project(2018YFC1505401)supported by the National Key R&D Program of ChinaProject(41702310)supported by the National Natural Science Foundation of China+1 种基金Project(SKLGP2017K014)supported by the Foundation of State Key Laboratory of Geohazard Prevention and Geo-environment Protection,ChinaProject(2018JJ3644)supported by the Natural Science Foundation of Hunan Province,China
文摘We proposed an enhanced image binarization method.The proposed solution incorporates Monte-Carlo simulation into the local thresholding method to address the essential issues with respect to complex background,spatially-changed illumination,and uncertainties of block size in traditional method.The proposed method first partitions the image into square blocks that reflect local characteristics of the image.After image partitioning,each block is binarized using Otsu’s thresholding method.To minimize the influence of the block size and the boundary effect,we incorporate Monte-Carlo simulation into the binarization algorithm.Iterative calculation with varying block sizes during Monte-Carlo simulation generates a probability map,which illustrates the probability of each pixel classified as foreground.By setting a probability threshold,and separating foreground and background of the source image,the final binary image can be obtained.The described method has been tested by benchmark tests.Results demonstrate that the proposed method performs well in dealing with the complex background and illumination condition.
文摘从SMARTS(The Small and Moderate Aperture Research Telescope System)数据库,收集到了平谱射电类星体(FRSQ)0208-512天体光学波段B、V、R的观测数据,数据从2008年2月–2017年8月,时间跨度近10 yr.分别获得了光学B波段数据627组、V波段数据634组、R波段数据639组.通过加权小波Z变换法(WWZ)和蒙特卡洛模拟的LombScargle periodogram(LSP)方法研究得出了如下结论:(1)在两种方法中都得到了光学B、V、R 3个波段有可能存在396 d左右约为1.08 yr的周期性光变;(2)得到了B波段星等B与光学波段色指数(B-V)呈正相关关系,当B星等越小时色指数(B-V)越小,即越亮越蓝;(3)通过光学3个波段的1.08 yr的长周期光变得到天体中心黑洞质量M约为0.12×10^(6)M⊙,辐射区半径RM=1.052×10^(8)km,其中M⊙为太阳质量.
