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Compensation method for focal length inconsistency after switching cameras day and night

A compensation method and back focus technology, applied in the field of cameras, can solve problems such as unstable image clarity, and achieve the effect of ensuring imaging clarity

Active Publication Date: 2016-01-13
SHANGHAI RUISHI MACHINE VISION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a compensation method for focal length inconsistency after day and night switching cameras, so as to overcome the defect of unstable image definition of existing day and night switching cameras

Method used

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  • Compensation method for focal length inconsistency after switching cameras day and night
  • Compensation method for focal length inconsistency after switching cameras day and night
  • Compensation method for focal length inconsistency after switching cameras day and night

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Embodiment Construction

[0014] The day and night switching camera involved in the present invention comprises a lens and an optical filter switching mechanism, and the optical filter switching mechanism is provided with a visible light filter and an infrared light filter, and light (visible light or infrared light) passes through the lens and the optical filter and passes through the CCD. on the imaging. Due to the difference in the refractive index of the lens for visible light and infrared light, the back focus of visible light and infrared light imaging is inconsistent, and the back focus of infrared light is larger. It is advisable to record the difference between the infrared light back focus minus the visible light back focus as ΔL . Visible light filters and infrared filters with the same thickness are used in the prior art. Although the refractive index of the filters for visible light and infrared light is also different, the difference is relatively small, and the thickness of the filters i...

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Abstract

The invention discloses a compensation method for inconsistency of focal length after day and night switching cameras, the day and night switching camera includes a lens and an optical filter switching mechanism, and the optical filter switching mechanism is provided with a visible light filter and an infrared optical filter. The compensation method is to make the thickness of the visible light filter greater than the thickness of the infrared filter, and the distance that the visible light filter shifts the back focus of visible light is greater than the distance that the infrared filter shifts the back focus of infrared light. The back focus distance difference caused by the film compensates the back focus difference caused by the lens, so that the back focus distance of visible light and infrared light are consistent. The invention skillfully utilizes the difference in thickness between the visible light filter and the infrared filter, and uses the back focus deviation caused by the filter to compensate the back focus deviation caused by the lens, so that the back focus of the visible light and the infrared light are consistent. In this way, without the need for focusing, the imaging clarity of the day and night switching camera can also be guaranteed.

Description

technical field [0001] The invention relates to a camera, in particular to a solution to the inconsistency of the focal length after switching the camera day and night due to the change of the imaging light wavelength. Background technique [0002] The day and night switching camera can use visible light to take color pictures during the day, and use infrared light to take black and white pictures at night. In order to ensure the imaging effect of the camera in both day and night environments, it is necessary to set a filter switching mechanism in the day and night switching camera. The switching mechanism has two filters, which are respectively a visible light filter and an infrared filter. During the day, the camera uses a visible light filter, and only visible light can pass through; at night, it uses an infrared filter, and only infrared light can pass through. [0003] Day and night switching cameras use visible light for imaging during the day and infrared light for ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B17/14G02B5/20
Inventor 史修栋
Owner SHANGHAI RUISHI MACHINE VISION TECH
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