An aerial camera focusing system

Abstract

The invention discloses an aerial camera focusing system, which comprises a lighting source, a collimating lens, an object, a beam-splitting prism, an objective lens, a reflector, a CCD (Charge Coupled Device), a signal acquisition module and a driving control module. During focusing, the reflector is rotated to be perpendicular to an optical axis; light emitted by the lighting source is collimated by the collimating lens for uniformly lighting the object which is placed on a focal plane of the objective lens of a camera; then the beam is split by the beam-splitting prism through reflection and transmission; the light which transmits through the prism is reflected back through the reflector after passing through the objective lens and then passes through the objective lens; and finally, the reflected light is imaged on the CCD by the beam-splitting prism. During imaging, the reflector is clockwise rotated at an angle of 45 degrees, ground light is reflected by the reflector, and the reflected light is directly imaged on the CCD by the beam-splitting prism after passing through the objective lens. The system is suitable for focusing of a medium-length focal aerial camera with a scanning reflector; a focusing optical path directly guides imaging of an imaging optical path; the control complexity is reduced; and the stability of the system is improved.

Description

technical field [0001] The invention relates to an aerial camera focusing system, which is suitable for the field of aerial cameras. Background technique [0002] Imaging quality is the most important performance index of aerial cameras. It is not only restricted by the optical system, but also affected by various environmental factors such as atmosphere, stray light, temperature, image motion, and CCD devices. Changes in environmental factors such as temperature, atmospheric pressure, and altitude will cause the position of the camera's optical focal plane to move, resulting in defocus. If the amount of defocus exceeds half the depth of focus, the photographic resolution will be significantly reduced, and even imaging will not be possible in severe cases. The current aerial camera focusing method can adopt the method of direct image processing on the captured ground image. This method has certain limitations: it has a remarkable focusing effect on areas with rich scene inf...

AI Technical Summary

Problems solved by technology

[0005] The technology of the present invention solves the problem, overcomes the deficiencies in the prior art, and provides an aerial camera focusing system to solve the problem that the focusing mirror needs to be swept, the focal plane mirror, and the receiving grating are needed, and the system complexity increases. Addresses issues where focus does not work on low-contrast targets, etc.

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