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公开(公告)号：US10467742B2
公开(公告)日：2019-11-05
申请号：US16168834
申请日：2018-10-24
Applicant: Axis AB
Inventor： Can Xu , Per Wilhelmsson
Abstract: An image capturing device captures a first image of the scene without illuminating the scene with IR radiation. The image capturing device determines a first value of a measure relating to contrast for the first image. When the first value indicates that a first contrast of the first image less than a first threshold value, the image capturing device captures a second image of the scene while illuminating the scene with IR radiation. The image capturing device determines a second value of the measure relating to contrast for the second image. When a difference between the first contrast and a second contrast, indicated by the second value, is greater than a second threshold value, the image capturing device determines that there is fog in the scene. A computer program and a computer program carrier are also disclosed.
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公开(公告)号：US20190057492A1
公开(公告)日：2019-02-21
申请号：US16105423
申请日：2018-08-20
Applicant: Axis AB
Inventor： Per Wilhelmsson
Abstract: A method and an image processing device for detecting a portion of an image that is dominated by infrared (IR) light of at least one predetermined IR wavelength are disclosed. A set of phase pixel values for setting focus in the image is obtained. Each of the phase pixel values is compared to a first threshold related to phase shift occurring due to difference between at least a wavelength of the first colour component and said at least one predetermined IR wavelength. Moreover, in case a phase pixel value satisfies the first threshold, it is determined that the respective location associated with said phase pixel value is included in the portion of the image that is dominated by the IR light. A computer program and a computer program carrier are also disclosed.
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公开(公告)号：US10929960B2
公开(公告)日：2021-02-23
申请号：US16105423
申请日：2018-08-20
Applicant: Axis AB
Inventor： Per Wilhelmsson
IPC: G06T5/00 , G06T5/20 , G06T7/90 , G06T7/80 , G06T7/00 , G06K9/00 , G06T7/136 , H04N5/232 , G06T5/50
Abstract: A method and an image processing device for detecting a portion of an image that is dominated by infrared (IR) light of at least one predetermined IR wavelength are disclosed. A set of phase pixel values for setting focus in the image is obtained. Each of the phase pixel values is compared to a first threshold related to phase shift occurring due to difference between at least a wavelength of the first colour component and said at least one predetermined IR wavelength. Moreover, in case a phase pixel value satisfies the first threshold, it is determined that the respective location associated with said phase pixel value is included in the portion of the image that is dominated by the IR light. A computer program and a computer program carrier are also disclosed.
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公开(公告)号：US20190122355A1
公开(公告)日：2019-04-25
申请号：US16168834
申请日：2018-10-24
Applicant: Axis AB
Inventor： Can Xu , Per Wilhelmsson
Abstract: An image capturing device captures a first image of the scene without illuminating the scene with IR radiation. The image capturing device determines a first value of a measure relating to contrast for the first image. When the first value indicates that a first contrast of the first image less than a first threshold value, the image capturing device captures a second image of the scene while illuminating the scene with IR radiation. The image capturing device determines a second value of the measure relating to contrast for the second image. When a difference between the first contrast and a second contrast, indicated by the second value, is greater than a second threshold value, the image capturing device determines that there is fog in the scene. A computer program and a computer program carrier are also disclosed.
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