고배율 관측카메라의 실시간 영상 떨림 이미지보정

Long-range observation devices were developed for surveillance and reconnaissance of objects in a long distance. This long-range system, which would be required to image up to 25 km, has been subjected to image shaking problem. Our objective was to reduce image shaking by modifying some parts in an observation camera, resulting in improvement of its performance. Pan, tilt, and zoom are the movement options of an observation camera. A torsion spring was employed to minimize backlash in gears, which control pan and tilt movement. A gear reduction device was also developed and installed between a step motor and a lens adjusting gear in order to accurately control zoom movement. The performance of this observation system was evaluated at different wind speed (1-5 m/s) and vibration (1-5 Hz). Without any modification, an object at 20 km was shaken by more than 30 pixels, which was almost impossible to clearly identify it. However, when the torsion spring and gear reduction device were installed, the mage shaking was dramatically reduced: down to 3 pixels at even 5 Hz of vibration and down to 4 pixels at even 5 m/s of wind. It could easily detect objects such as people, vehicles, and small structures from a long range. This observation system, combined with automated object recognition and tracking software, would be used in shipboard and airborne application.