The Development of a CCD Camera with External Trigger Shutter Function and the Applications
Kenji KANAYAMA, Yutaka KATOH, Takeshi NAITOH
High-speed shutter function is indispensable to obtain a still image for the image processing of rapid moving objects. We propose a new video camera with the electronic shutter function using a frame transfer type CCD (FT-CD), and a new external trigger shutter function which enables to operate the shutter without transient image distortion at any external timing. The electronic shutter function is realized by such a method that stores necessary charges only for the duration of shutter timing by controlling directly FT-CD. As to “smear” which is likely to make a problem to FT-CCD, we confirmed by detailed analysis that “smear” provides no problem in practical uses. To prove the usefulness of this camera, we applied this to the vehicle-license number recognition unit and the automatic defect picture recording system of the paper manufacturing line. These results show that the use of this camera can be expanded to various fields.