等高线分析天文日食图片的方法

Solar Eclipse Picture Analysis Method by the Contour Line on Maps

针对日食照片蕴含恒星内部运动的大量信息的特点,本文提出等高线处理日食照片的方法。该方法根据黑体/灰体辐射原理,等亮度处的温度近似相等,采用对数字图像以给定阈值作二值化处理,生成黑白图像;再二次微分获边界线即为指定色阶的等高线。尝试、选定特殊的等高线标识日食图片,从日冕部分获得了太阳表面喷发、炽热气流垂直和水平运动,粒子束和日珥的分层结构及其发展趋势,色球层结构。实验结果表明,等高线可标识出人眼无法看到的暗场结构;低ISO、适度曝光、未PS的图片,可获得更丰富的日食下的太阳或者恒星大气运动细节信息;并发现喷发及其溅射物质外形和太阳风的结构。

Aimed at the abundant information about inner star dynamics on eclipse picture,a method for dealing with the picture was presented by contour line.According to blackbody or grey body radiation theory,the temperature is nearly equal if the brightness was the same.The color picture turned into binary processing with getting the threshold brightness value.Then it got a boundary line--the contour line on maps of appointed color rank by differential calculus twice.Solar eclipse picture is marked by selecting special contour line on maps.The sun surface spray,intensely hot atmosphere current vertical movement or advection are obtained from the solar corona,and the shape,structure and developing trends of the particle beams and solar prominence,and even the chromosphere structure are also acquired.Experimental results indicate that contour line on maps can identify the dark and sightless field structure.The more abundant atmosphere motion details are acquired on the sun or fixed stars under solar eclipse with low ISO and within limit exposure and un-PS picture.The shape of spray and spurting matter and the solar wind＇s structures can be also found.