紫外环形成像仪图像数据的实时处理

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第42卷增刊 1Vo1.42 No.S1红外与激光工程Infrared and Laser Engineering2013年 6月Jun.2013Real-time 13 "Lg of。 g data of ultraviolet annul processin Olma e Ot ar l maler IWu Weiping ，Wang Dong ，Zhang Bin ，Sun Tianyu(1.Changchun Institute of Optics，Fine Mechanics and Physics，Chinese Academy of Sciences，Changchun 130033，China2.University of Chinese Academy of Sciences，Beijing 100049，China)Abstract：For accurately calibrating Ultraviolet annular imager，aiding alignment exactly and measuring its struc-ture，an image data processing system was developed by analyzing the optic structure and data characteristic of theUltraviolet annular imager.Efectively scheduling two threads reduced the bottle-neck of image data processingsystem；a method of filling mask increased the performance of local area lightening；painting of oveday CHI Ve canimprove alignment precision；the function of picking up inside curve would heighten measuring eficiency.The cal-ibration results show that the image data processing system can synchronously parse 3 bands data，checkout theirCRC errors，display images，draw overlay line，and draw cross-sectional curves and lighten local areas with thosetechniques，when the data flow is up to 22.5MB/s.The system works steadily in al those process and human-computer interaction runs rapidly.No data package was lost in the calibration experiments.The overlay curves canprovide pixel level precision alignment.The system ensures measuring eficiency and it also provides exact data forinversing space distribution and dynamic structure of air radiation in all directions。

Key words：ultraviolet annular imager； image processing； real-time； calibration； aid alignmentCLC number：TH73 Document code：A Artical ID：1007-2276(2013)S1-0233-05紫外环形成像仪图像数据的实时处理吴伟平 ，王 栋 ，张 滨 ，孙天宇(1.中国科学院长春光学精密机械与物理研究所，吉林 长春 130033；2.中国科学院大学，北京 100049)摘 要 ：为了对紫外环形成像仪精确定标，并辅助其精密装调和结构检测，通过分析紫外环形成像仪的光学结构和其图像数据的特点，设计并实现 了紫外环形成像仪图像数据实时处理 系统。通过双线程的有机调度，有效降低了系统瓶颈；采用掩码填充方式提高局部高亮显示的性能；使用绘制叠加线的方法提高装调精度；设计了剖线提取等关键功能提高定标效率。定标过程表明，应用这些方法该系统在 22.5MB/s满负荷数据流条件下同时对 3个波段进行数据解析、CRC校验、图像显示、辅助线绘制和局部高亮显示等功能，整个过程 系统运行稳定，人机交互流畅，未发生丢 包现象；辅助线可提供像素级的对准精度，保证 了装调精度和检测效率，为反演大气辐射多方住的空间分布及动态结构提供了准确的数据支持。

关键词：紫外环形成像仪； 图像处理； 实时； 定标； 辅助装调收稿日期：2013-01-05； 修订日期：2013-02-1O作者简介：吴伟平(1980-)，男，博士生，主要从事航天遥感器电子学仿真测试等方面的研究。Email：rainciomp###sina.conl导师简介：金龙旭(1965-)，男，研究生，博士生导师，主要从事空间相机智能控制技术的研究。Email：jinlx### eiomp.ac.cn236 红外与激光工程 第42卷rection is vertically downwardly；the intersecting point is( o，Y0)； stands for the image length and H stands forheight；ot stands for the angle between any line and thehorizontal axis；the line equation can be expressed asY-Y0tgut×( - 0) (1)When ∈[0，45]u[135，180]，the intersectionpoint of the line and both edges of valid range are(0，Yo0×tga)and( ，Yo( 0-L)×tga)；when ot∈ (45，90)u(90，135)，the intersection of the line and the edgeof the valid upper and lower range are( 0Y0/tga，0)and( 0(Y0-H)/tgt，H )；when A ：90，the inter-section of the line and the edge of the valid upper and low-er range are( ，0)and( ，H).The intersection of eachline and the edge of valid range can be calculated througheach angle between line and the horizontal axis.It is veryconvenient that using theLineTo”function draw CROSS-line.When the magnification of image is changed，the e·quation of edge can be taken into formula(1)to obtainthe intersection.And then we can draw the cross-lineaccording to new intersection。

We can obtain the cross-sectional curve according tothe intersection of the line and edge of valid range.First，two adjacent sides are compared，and the axis of the longerside is choused(set X [kl，k ]).Then，the point co-ordinates passed by the line is(k ，Yo (x0-k )×tant)，i[kl，k ].The pixel value can be easily ob-tained through the coordinate of point.The obtained pixelsare sent to show the cross-sectional curve and the maxi。

mum value of the entire curve is obtained，the minimum，mean and variance。

3.2 Local HighlightT0 highlight the image characteristics of the edge ofthe field，the image data processing software highlight theedge of the field using the formula(2).The minimumvalue of the frame is mapped to 0，and the maximum of theflame is mapped to 255.The(monotonic rise)the valuebetween the minimum value and the maximum value isnonlinear mapped to 0 - 255。

1，BYrI1E(25[ dou ble (X- Xmi n))(2)When 0.5.the image brighter.Since equation(2)contain an extraction operation，the highlight displayof the whole picture is too dificult to meet the eficiencyrequirements.Therefore，we only real-time highlightedthe valid area，which is the rectangular area on each sideof the highlight(see figure 5)。

/ L - B//<、 / /- A/， l .. -] /lg.5 Scheme of highlight areaIn order to improve eficiency of highlighting local ar-ea，the method of seting image mask is used to highlightimage.First，the memory space which is as big as the im-age is created as a mask area.Then，the areas which needto highlight in mask area are filed with the value 0xf；theareas which need to non-highlight in mask area are filledwith the value OxO0.That is the mask of the image.Whenthe image needs to be highlighted，the rule that determinewhere to highlight is to analyze the value in mask area。

Only when the user changes the position or size of thehighlighted area，the values in the mask areas need to berecalculated。

The method of filled mask area adopts the classic pol-ygon-filling algorithm.In the standard coordinate sys-tem，the center point coordinates of regular hexagonal is( ，Y0).The length between the center point and the topdot of regular hexagonal is r.The length and width of rec-tangular region which need to be highlighted aye l and w。

The midpoint coordinates of upper right side coordinates is( l，Y1).So( l，Y1)can be calculated by these formula。

1 o0.75×r (3)Y1Yo-0.433×r (4)According to the geometric relationship，the midpoint