基于普通CCD的每秒百万帧高帧频成像方法

针对CCD图像输出时间长影响其帧频率的问题,提出了一种基于普通CCD实现超高帧频成像的方法.采用掩膜覆盖CCD的光敏区,建立图像的片上存储空间,消除CCD电荷转移输出占用过多时间的影响,可以使普通CCD的帧频达到每秒百万帧频以上.介绍了不同掩膜实现方案的优缺点,讨论了掩膜图像的恢复方法,采用条状孔掩膜方式建立了基于普通CCD的每秒百万帧高帧频成像系统样机,利用氙灯对样机性能进行验证,获得了14幅79×79像素的氙灯发光过程图像,样机帧频率达到了每秒200万帧的超高速度.

Million Frames per Second Imaging Method Based on Normal CCD Sensor

An ultra-high speed imaging method based on normal CCD sensor was proposed.The light sensitive area of the chip was covered by the mask and turned into storage area.The influence of extra time that CCD charge transfer took was eliminated.So the frame rate of masked CCD could achieve million frames per second.The different types of masks were introduced,and the restoration method of masked images was discussed.The method of strip-hole array mask was used to build the ultra-high speed imaging prototype base on normal CCD,and the performance was verfied by xenon lamp.After the location of mask pixel center and mask direction are both known,the masked images is finally separated and reformed into several low resolution result images.Results show that a performance of 2 million frames per second is achieved and 14 images with a resolution of 79 pixel× 79 pixel are got.