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A method for sequential control of IR-filter, and an assembly performing such method

A sequential control and component technology, applied in the field of IR filters, to reduce artifacts and achieve high success rates

Active Publication Date: 2018-07-06
AXIS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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There is also considerable wear and tear on the actuator

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  • A method for sequential control of IR-filter, and an assembly performing such method
  • A method for sequential control of IR-filter, and an assembly performing such method
  • A method for sequential control of IR-filter, and an assembly performing such method

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Embodiment Construction

[0030] figure 1 is a schematic diagram showing an apparatus of which the present apparatus and method may form a part. Shown is a camera 100 , such as a video camera having an image sensor 102 and a camera lens housing 104 . The camera lens housing 104 of the example shown has a standard layout with a lens system 106 and an aperture 108 . This is obviously a very simplistic description of the camera lens housing, but is considered sufficient for the purposes of this application.

[0031] Aperture 108 is placed in the aperture stop of lens system 106 (or as physically close to the aperture plane as possible). For an ideal singlet lens system, the aperture stop would be in the middle of the lens, perpendicular to the optical axis. In addition to what has already been stated, the characteristics of the aperture stop imply that the size of the aperture will only affect the amount of light reaching the image sensor 102, not the actual image. More specifically, any shadowing or ...

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Abstract

The invention relates to a method for sequential control of IR-filter, and an assembly performing such method. The method comprises: initiating closing or opening of the diaphragm having an initial aperture opening; detecting an amount of incident radiation when the diaphragm has the initial aperture opening; shifting the aperture opening of the diaphragm to an intermediate aperture opening in order to alter the ratio between visible light and infrared radiation passing the diaphragm, by means of: if closing of the diaphragm is initiated, performing a predetermined partial closing of an aperture of the diaphragm, or if opening of the diaphragm is initiated, performing a predetermined partial opening of the aperture of the diaphragm. The method further comprises: detecting an amount of incident radiation following the shift of the aperture opening; calculating a composition of visual light and infrared radiation in the scene from the detected amounts of incident radiation and a calculated ratio between visible light and infrared radiation when having the initial aperture opening and the intermediate aperture opening respectively; and shifting the aperture opening of the diaphragm toa new position if appropriate.

Description

technical field [0001] The present invention relates to controlling the IR filter of a camera, and in particular to controlling an IR cut filter integrated in the aperture of the camera lens system. Background technique [0002] The use of IR (infrared) filters for video cameras is well known in the art and especially with digital video cameras. In short, the camera's image sensor has a spectral response to a non-negligible component of the infrared. This leads to opportunities as well as challenges. The opportunity lies in low light conditions where the IR component can provide useful information about the imaged scene, information that can be enhanced even further with the help of IR light sources. Challenges are encountered during daytime imaging where the addition of IR components will distort the color balance in the image and can also completely saturate the image sensor. [0003] One way to maintain the beneficial effect while suppressing the less beneficial effect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/225H04N5/232H04N23/75
CPCH04N23/54H04N23/50H04N23/55H04N23/60H04N23/667G03B7/095G03B11/00G03B9/06G03B7/091G02B5/208G03B7/00G03B9/00
Inventor 斯蒂芬·伦德贝里约纳斯·耶尔姆斯特伦
Owner AXIS