An aerial camera focusing system

An aerial camera and focusing technology, which is applied in the field of aerial camera focusing system, can solve the problems of invalid low-contrast targets, increased system complexity, and the need for focal plane mirrors for focusing mirrors, so as to reduce control difficulty and control Effect of reduced complexity and reduced mechanical structure

Inactive Publication Date: 2011-12-28
INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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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

Method used

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  • An aerial camera focusing system
  • An aerial camera focusing system
  • An aerial camera focusing system

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Embodiment Construction

[0018] Such as image 3 As shown, the present invention is made up of illumination light source 1, collimating lens 2, target 3, dichroic prism 4, objective lens 5, mirror 6, CCD7, signal acquisition module 8 and drive control module 9, wherein target 3 and CCD7 position conjugate .

[0019] The signal acquisition module 8 includes an acquisition amplifier circuit and a filter circuit, and the drive control module 9 includes a CPU (Central Processing Unit), position feedback, and focusing drive. The acquisition and amplification circuit directly obtains the target image, the filter circuit hardware preprocesses the image, and directly transmits the image to the CPU for calculation of the focusing function. The CPU sends instructions to the focusing driver, and the position feedback returns position information, and the closed-loop control focusing motor M performs focusing.

[0020] The focusing system of the present invention includes two optical paths of imaging and focusin...

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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...

Claims

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Application Information

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IPC IPC(8): G03B13/32G02B7/08
Inventor 汪旋蓝公仆高晓东梁伟胡家文
Owner INST OF OPTICS & ELECTRONICS - CHINESE ACAD OF SCI
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