In a camera system of CCD as sensor and utilizing CCD video signal integrated processor (video signal processor for short)
when gain is high
the black level auto-correction process of video signal processor will cause CCD image gray value vary slowly and sharply at the beginning stage with target brightness not varying. Based on XRD98L59 of EXAR
this paper analyzes the device structure and its black level auto-correction process
establishes the model of black level auto-correction process
determines the parameters by experiment
and verifies the correctness of the model. According to the calculating results of the model
the preparing time of the camera system is adjusted to 5 s
the problem that CCD image gray values vary "slowly" and "sharply" at the beginning stage is resolved.
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Related Author
GUO Tai-liang
YAO Jian-min
LIN Zhi-xian
SONG Yue
张传胜
ZHANG Liu
ZHENG Liang-liang
JIN Guang
Related Institution
College of Physics and Information Engineering, Fuzhou University
State Key Laboratory of Interaction with Matter and Laser, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences
Engineering Research Center of Field Emission Display Technology, Ministry of Education,Fuzhou University, Fuzhou 350002,China,E-mail:yongaizhang@fzu.edu.
Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China,E-mail: lina200361509@163.