金沙娱乐官方网站

NASA goes to the rescue of shaky home videos

作者:秋狗技    发布时间:2019-03-08 04:18:13    

By Barry Fox ARE your home videos of those once-in-a-lifetime events unwatchable? NASA could soon come to the rescue. The space agency has developed a system that not only corrects camera shake and accidental zooms, but can also sharpen images and reduce noise or “snow”. Videos of spacecraft launches can be a crucial tool if something goes wrong, but the violent forces at a launch often cause camera shake. To clean up such footage, David Hathaway and Paul Meyer of the Marshall Space Flight Center in Alabama developed the Video Image Stabilization and Registration (VISAR) system. The pair began work on the system in 1996, when the FBI asked NASA to enhance a 13-second video of the bomb blast at the 1996 Olympics in Atlanta, Georgia. Because the blast occurred at night, the understandably shaky video footage was also visually noisy. Hathaway and Meyer analysed every frame, looking for groups of pixels that remained the same between frames. Because random noise appears on only one frame at a time, analysing the steady patterns from several different frames provided the data needed to sharpen the image and reduce noise. Adjusting the position of each frame so that a target area stayed at a fixed position on screen eliminated camera shake. They have refined their technique so that it can now keep the size as well as the position of objects constant. This corrects for accidental zooming, a common problem caused simply by pressing the wrong button. NASA is licensing the technology and hopes it will one day be available for home use. The prototype system, which runs on a PC, takes around 15 seconds to analyse each frame. But as computer speeds increase, the processing time will come down,

 

Copyright © 网站地图