英语翻译Data analysis begins with digital videotapes recorded at the LMT being sent to JSC for processing.Eachcompressed video tape is loaded from a SONY DHR-1000 DV recorder/player onto a dual-processor 500 MHzPentium III PC through an IEEE 1394

英语翻译Data analysis begins with digital videotapes recorded at the LMT being sent to JSC for processing.Eachcompressed video tape is loaded from a SONY DHR-1000 DV recorder/player onto a dual-processor 500 MHzPentium III PC through an IEEE 1394
英语翻译
Data analysis begins with digital videotapes recorded at the LMT being sent to JSC for processing.Each
compressed video tape is loaded from a SONY DHR-1000 DV recorder/player onto a dual-processor 500 MHz
Pentium III PC through an IEEE 1394 PC1 board.This transfer is effected digitally without loss of information and
is effected in real-time,i.e.it takes one hour to transfer one hour of digital video from magnetic tape to a computer
file.The transfer is controlled via a dialog-based software application written in Visual C++.One hour of DV
compressed video stripped of audio comprises about 12 GB of storage,so an 18 GB drive is sufficient to hold both
an hour of video plus the output from the detection software.
Once the digital videotape is loaded onto PC,automated debris detection software is applied.This software
begins by decoding 200 compressed DV video images.Each video image pixel consists of three l-byte values; one
each for red,green,and blue.A weighted sum of these three values yields a single intensity value for each pixel.
The DV format compresses RGB information as fixed 120,000 bytes per image frame (Sony 1996).Each image
frame is composed of two fields; an even field containing the even numbered horizontal lines and an odd field.
Fields are recorded at 59.94 fields per second.Two preliminary subroutines are applied to the 200 decoded images
to determine the indices of image pixels within the camera FOV,the rate and direction through the image at which
the star field crosses the FOV,and a camera rotation angle.Then the main debris detection subroutine begins.This
subroutine runs at 12 times real time,taking 12 hours of computer time to detect the debris,meteors,and satellites
in one hour of digital video.This automated debris detection and tracking algorithm consists of the following
steps.
1) Decode the current color image frame and map it onto 640x480 pixel 1:1 aspect ratio images.
2) Form an estimate of the star field plus sky-background and subtract it from each image
3) Apply a library of matched filters to each image.
4) Find the maximum matched filter output for each of seven altitude bins.
5) Update a sample mean and variance for the maximum matched filter output in each of seven altitude bins.
6) Apply a dual-statistic hypothesis test to determine whether a debris object is present.The two statistics are
statistically independent,increasing the confidence level for the combined two-statistic test.
7) Track the detected debris objects through the FOV.Perform a quantitative check on the tracked history of
each object to further reduce false detections.
The automated detection software stores video clips of each detected satellite,debris,and meteor and providesestimates of the,altitude and inclination of the orbits.Once this processing is complete,the results are reviewed
and analyzed using a semi-automated Event-Reviewer software.

英语翻译Data analysis begins with digital videotapes recorded at the LMT being sent to JSC for processing.Eachcompressed video tape is loaded from a SONY DHR-1000 DV recorder/player onto a dual-processor 500 MHzPentium III PC through an IEEE 1394
数据分析始于数字录像记录在LMT被送往JSC加工.每个
压缩录影带是索尼的DHR-1000 DV记录/球员在dual-processor 500赫兹
奔腾III PC通过电器和电子工程师协会1394 PC1板.这种转移影响而不丢失信息和数字
在实时系统,即影响.它需要一个小时来传递一小时的数字视频从磁带到计算机
文件.这个转会来控制一个基于对话框的应用软件写在Visual C + +.1小时的DV影像
压缩视像剥夺音频由大约12播出,所以一个18岁的储存足够的流量以GB驱动
一个小时的视频加上输出检测软件.
一旦数码录像是到PC,自动化的碎片.检测软件该软件,
开始进行解码图像压缩DV影像200.每个视频图像像素由三个l-byte价值观;之一
每一个为红、绿、蓝三种颜色.这三个加权和价值观产生一个单一的强度值为每个像素.
压缩格式的DV固定12字节编程信息每张图片框(索尼1996).每张图片
框架是由两个领域;甚至连数字段的水平线和一个古怪的领域.
在59.94领域所记录的领域.两个初步的子程序是用于200解码图像
确定指标在相机像素的速度和方向FOV,通过图像在哪
跨领域的明星,相机FOV旋转角度.然后主要残骸检测程序开始.这个
程序运行时,12次实时12个小时的电脑的时间来检测这些残骸,流星,人造卫星
在一个小时的数字视频.该自动检测与跟踪算法的碎片组成的下面
步骤.
1)解码当前彩色图像的框架和地图在640x480像素宽高比图像1:1.
二)形成的恒星,以及sky-background领域中减去从每张图片
三)申请一个图书馆,对每一图像匹配滤波器.
四)发现最大匹配滤波器的输出为每七高度箱内.
五)更新样品的均值和方差的最大匹配滤波器,每一年的产量都有七个高度箱内.
六)申请一个dual-statistic假设检验来确定一个碎片的对象是礼物.这两个数据
统计独立,增加可信度联合two-statistic测试.
7)跟踪探测到物体的碎片.FOV执行的检验追踪的历史
每个对象,以进一步降低错误的识别.
自动检测软件商店视频剪辑,每个探测卫星,碎片,流星和providesestimates倾向的,高度、轨道.一旦这种处理完成,结果进行了详细的综述
并分析了利用一个半自动化的Event-Reviewer软件.