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公开(公告)号：US09888187B2
公开(公告)日：2018-02-06
申请号：US15088787
申请日：2016-04-01
Applicant: Axis AB
Inventor： Jonas Hjelmström , Andreas Nilsson
CPC classification number: H04N5/2628 , G06T3/0093 , G06T5/006 , G06T7/13 , G06T7/80 , H04N5/217 , H04N5/3572 , H04N17/002
Abstract: A method and apparatus for determining a focal-length setting of a lens mounted to a camera is disclosed. In a method for determining a focal-length of a lens mounted to a camera, a distorted image of a scene is captured. A distortion-correction function is applied on the distorted image or on a portion of the distorted image. A most representative distortion-correction function is identified and a current focal-length setting for the lens is identified by correlating the identification to a data compilation.
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公开(公告)号：US11785342B2
公开(公告)日：2023-10-10
申请号：US17498225
申请日：2021-10-11
Applicant: Axis AB
Inventor： Stefan Lundberg , Jonas Hjelmström
IPC: G06T7/70 , H04N23/695 , G06V20/52 , H04N23/63 , H04N23/67
CPC classification number: H04N23/695 , G06T7/70 , G06V20/52 , H04N23/633 , H04N23/671
Abstract: A method of activating an object-specific action comprises obtaining, based on image analysis of acquired images, a plurality of values of a movement characteristic, each value representing a moving object detected in the acquired images; receiving an input signal from a user input device, wherein the input signal represents a value of the movement characteristic for the user input device; comparing the value of the movement characteristic for the user input device with each value of the movement characteristics for the moving objects, and determining the moving object corresponding to the closest value of movement characteristic as a selected moving object; and activating the object-specific action for the selected moving object.
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公开(公告)号：US11711622B2
公开(公告)日：2023-07-25
申请号：US17591651
申请日：2022-02-03
Applicant: Axis AB
Inventor： Jonas Hjelmström , Ola Håkansson
CPC classification number: H04N23/75 , G01J1/0411
Abstract: An arrangement for determining an amount of light reaching an image sensor of a video camera is disclosed. The video camera comprises an imaging lens system guiding a beam path towards an image sensor and has an aperture plane where a variable aperture is arranged. The inventive arrangement comprises a light sensor arranged to probe light intensity continuously from a portion of the beam path, which portion is located in or near the aperture plane of the imaging lens system.
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公开(公告)号：US10687036B2
公开(公告)日：2020-06-16
申请号：US16167393
申请日：2018-10-22
Applicant: Axis AB
Inventor： Jonas Hjelmström
Abstract: The disclosure relates to a method, apparatus and system for detecting and reducing the effects of color fringing in digital video acquired by a camera comprising an iris. The method comprises: acquiring, by the camera, a first digital image frame using a first camera setting, including a first iris aperture size; acquiring, by the camera, a second digital image frame using a second camera setting, including a second iris aperture size, wherein the second aperture size is smaller than the first aperture size; comparing the first and the second digital image frame, at least a specific color component thereof; localizing regions having a disproportional intensity ratio in the specific color component between the first digital image frame and the second digital image frame; and reducing the specific color component in the localized regions for subsequently acquired digital image frames.
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公开(公告)号：US10567713B2
公开(公告)日：2020-02-18
申请号：US15857127
申请日：2017-12-28
Applicant: Axis AB
Inventor： Stefan Lundberg , Jonas Hjelmström
Abstract: A camera comprising: an aperture; an image sensor comprising a plurality of pairs of pixels where in each pair: a first pixel is configured such that it detects radiation which has entered the camera through the aperture to the image sensor via a first radiation path, and a second pixel is configured such that it detects radiation which has entered the camera through the aperture to the image sensor via a second radiation path, the second radiation path being different from the first radiation path; and a filter arranged in the vicinity of the aperture, wherein the filter comprises a first portion configured to block IR-radiation or visible light and a second portion configured to be transparent to wavelengths that are blocked by the first portion, wherein radiation passing the first portion travels to the first pixels, and radiation passing the second portion travels to the second pixels.
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Patent Agency Ranking
公开(公告)号：US20160295131A1
公开(公告)日：2016-10-06
申请号：US15088787
申请日：2016-04-01
Applicant: Axis AB
Inventor： Jonas Hjelmström , Andreas Nilsson
CPC classification number: H04N5/2628 , G06T3/0093 , G06T5/006 , G06T7/13 , G06T7/80 , H04N5/217 , H04N5/3572 , H04N17/002
Abstract: A method and apparatus for determining a focal-length setting of a lens mounted to a camera is disclosed. In a method for determining a focal-length of a lens mounted to a camera, a distorted image of a scene is captured. A distortion-correction function is applied on the distorted image or on a portion of the distorted image. A most representative distortion-correction function is identified and a current focal-length setting for the lens is identified by correlating the identification to a data compilation.
Abstract translation: 公开了一种用于确定安装到相机的镜头的焦距设置的方法和装置。 在确定安装到相机的透镜的焦距的方法中，捕获场景的失真图像。 失真校正功能应用于失真图像或失真图像的一部分。 识别最具代表性的失真校正功能，并且通过将识别与数据汇编相关联来识别用于透镜的当前焦距设置。
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公开(公告)号：US11582382B2
公开(公告)日：2023-02-14
申请号：US17591653
申请日：2022-02-03
Applicant: Axis AB
Inventor： Jonas Hjelmström , Ola Håkansson
Abstract: An arrangement for determining an amount of light reaching an image sensor of a video camera, the video camera comprising an imaging lens system guiding a beam path towards an image sensor, wherein the arrangement comprises a transparent probing element through which the beam path passes on its way to the image sensor, and a light sensor arranged in an end of the transparent probing element. The light sensor is arranged to collect light being scattered or reflected in the transparent probing element.
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公开(公告)号：US10531058B2
公开(公告)日：2020-01-07
申请号：US16009247
申请日：2018-06-15
Applicant: Axis AB
Inventor： Jonas Hjelmström , Stefan Lundberg , Ingemar Larsson
Abstract: A method and assembly produce color images of a scene captured by an image sensor exposed to visible light as well as IR radiation. A first image is captured with a first proportion of an iris aperture covered by an IR-cut filter. A first amount of radiation captured in the first image is determined and a second image captured with a second proportion of the iris covered by the IR-cut filter. A second amount of radiation captured in the second image is determined and a proportion of IR radiation is calculated in the scene based on the first amount of light, the second amount of light, the first IR-cut filter proportion, and the second IR-cut filter proportion. An IR contribution is removed from an image by using the calculated proportion of IR radiation.
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19.发明申请公开(公告)号：US20190166341A1
公开(公告)日：2019-05-30
申请号：US16167393
申请日：2018-10-22
Applicant: Axis AB
Inventor： Jonas Hjelmström
Abstract: The disclosure relates to a method, apparatus and system for detecting and reducing the effects of color fringing in digital video acquired by a camera comprising an iris. The method comprises: acquiring, by the camera, a first digital image frame using a first camera setting, including a first iris aperture size; acquiring, by the camera, a second digital image frame using a second camera setting, including a second iris aperture size, wherein the second aperture size is smaller than the first aperture size; comparing the first and the second digital image frame, at least a specific color component thereof; localizing regions having a disproportional intensity ratio in the specific color component between the first digital image frame and the second digital image frame; and reducing the specific color component in the localized regions for subsequently acquired digital image frames.
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公开(公告)号：US10146101B2
公开(公告)日：2018-12-04
申请号：US15857077
申请日：2017-12-28
Applicant: AXIS AB
Inventor： Stefan Lundberg , Jonas Hjelmström
Abstract: A method for sequential control of a diaphragm arrangement of a camera, the arrangement comprising a diaphragm, and an integrated IR cut filter always covering at least a portion of an aperture opening of the diaphragm, comprising: initiating closing or opening of the diaphragm; detecting an amount of incident radiation when the diaphragm has an initial aperture opening; shifting the aperture opening to an intermediate aperture opening to alter the ratio between visible light and infrared radiation passing the diaphragm; detecting an amount of incident radiation following the shift; 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 to a new position.
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