1. Oblique distance defocus compensation for oblique photographic airborne camera
- Author
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贾继强 Jia Ji-qiang, 刘波 Liu Bo, 苏东风 Su Dong-feng, and 丁亚林 Ding Ya-lin
- Subjects
Physics ,business.industry ,Mathematics::Analysis of PDEs ,Process (computing) ,Physics::Optics ,Oblique case ,Mechanism based ,Residual ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Compensation (engineering) ,Mechanism (engineering) ,Optics ,Imaging quality ,business ,Nonlinear Sciences::Pattern Formation and Solitons - Abstract
For defocus generated during imaging from an oblique photographic airborne camera, a corresponding focusing mechanism was designed to compensate oblique distance defocus for high imaging quality. The principle of oblique distance defocus was analyzed, the formula of defocus compensation was obtained and a cam mechanism was proposed to compensate the defocus. A focusing mechanism based on a cylindrical cam was designed to replace the traditional focusing mechanism based on eccentric cam, in which the theoretically mode is exact instead of proximal. As the oblique distance defocus system was designed based on a typical height, the residual defocus would be emerged at other heights. The cause of residual defocus was analyzed. The process method and process flow were developed to eliminate the residual defocus. All amount of oblique distance defocus were compensated in all heights and scan angels. Camera imaging simulation with different objects in laboratory approves the validity and accuracy of the proposed focusing mechanism. more...
- Published
- 2014
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