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公开(公告)号：US10721393B2
公开(公告)日：2020-07-21
申请号：US15858008
申请日：2017-12-29
Applicant: Axis AB
Inventor： Oscar Sandstrom , Can Xu
IPC: H04N5/232 , H04N5/225 , G01S17/36 , G01S17/87 , G01S7/48 , G01S7/4915 , G01S17/42 , G01S7/4911 , G01S17/86
Abstract: A method may include modulating a property of a laser with a reference signal to generate a transmit signal, and diverging the transmit signal to illuminate a field of illumination with the transmit signal, wherein the field of illumination includes an object. The method may include receiving, at a sensor, a signal reflected from the field of illumination and the object and comparing a phase of the received signal to a phase the reference signal. The method may include calculating a distance to the object based on the comparing.
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Patent Agency Ranking
公开(公告)号：US20190208113A1
公开(公告)日：2019-07-04
申请号：US15858008
申请日：2017-12-29
Applicant: Axis AB
Inventor： Oscar Sandstrom , Can Xu
Abstract: A method may include modulating a property of a laser with a reference signal to generate a transmit signal, and diverging the transmit signal to illuminate a field of illumination with the transmit signal, wherein the field of illumination includes an object. The method may include receiving, at a sensor, a signal reflected from the field of illumination and the object and comparing a phase of the received signal to a phase the reference signal. The method may include calculating a distance to the object based on the comparing.
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3.发明授权公开(公告)号：US10324268B2
公开(公告)日：2019-06-18
申请号：US15697028
申请日：2017-09-06
Applicant: Axis AB
Inventor： Johan Nystrom , Can Xu
Abstract: Autofocusing a camera while zooming may include zooming the lens to a first zoom position, measuring a first object distance from the camera to an object on which to focus, determining a first focus start position using the first object distance, performing a first autofocus using the first focus start position as a starting point, thereby determining a first focus position. A first lookup object distance may be determined based on the first determined focus position. A first correction factor may be calculated as a ratio between the first lookup object distance and the first object distance. The lens may be zoomed to a second zoom position, and a second focus position may be determined using a second object distance based on the first object distance and a second correction factor based on depths of field at the second and first zoom positions.
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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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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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6.发明申请公开(公告)号：US20180074287A1
公开(公告)日：2018-03-15
申请号：US15697028
申请日：2017-09-06
Applicant: Axis AB
Inventor： Johan Nystrom , Can Xu
CPC classification number: G02B7/282 , G02B7/09 , G02B7/285 , G03B13/36 , G03B2205/0046 , G06K9/00624 , H04N5/232121 , H04N5/23296
Abstract: A method of autofocusing a camera during a zooming operation is disclosed, comprising zooming the lens to a first zoom position, measuring a first object distance from the camera to an object on which to focus, determining a first focus start position using the first object distance, performing a first autofocusing operation using the first focus start position as a starting point, thereby determining a first determined focus position. A first lookup object distance is determined based on the first determined focus position. A first correction factor is calculated as a ratio between the first lookup object distance and the first object distance. The lens is zoomed to a second zoom position, and a second focus position is determined using a second object distance calculated as a product of the first object distance and a second correction factor based on a ratio of depths of field at the second and first zoom positions.
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