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公开(公告)号：US20210195075A1
公开(公告)日：2021-06-24
申请号：US17082117
申请日：2020-10-28
Applicant: Axis AB
Inventor： Stefan LUNDBERG , Jonas HJELMSTRÖM
Abstract: A camera for introducing light pulses in an image stream, comprising an image sensor arranged to capture an image stream, the image sensor comprising a plurality of pixels arranged to capture light of a first wavelength range. The at least one of the plurality of pixels is covered by a first material which is arranged to transform light of a second wavelength range to light of the first wavelength range. Further the camera comprises a first light source arranged to emit light pulses of light of the second wavelength range onto the first material, thereby causing the image sensor to register light pulses in the at least one pixel covered by the first material.
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公开(公告)号：US20190007665A1
公开(公告)日：2019-01-03
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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Patent Agency Ranking
公开(公告)号：US20220294978A1
公开(公告)日：2022-09-15
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：US20220294958A1
公开(公告)日：2022-09-15
申请号：US17591651
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 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：US20230375902A1
公开(公告)日：2023-11-23
申请号：US18296460
申请日：2023-04-06
Applicant: Axis AB
Inventor： Jonas HJELMSTRÖM , Ola Håkansson , Viktor Nordblom
IPC: G03B17/14
Abstract: An optical system comprises a lens system having at least one movable lens; a lens housing having an opening, the lens housing attachable to an image sensor so that the lens, the opening, and the image sensor are arrangeable along an axis with the opening between the lens and the image sensor; a probe extending towards the opening and that is fixed in relation to the lens; an actuation system for moving the lens along the axis and the probe parallel with the axis, so that the probe reaches out to a location where the image sensor is arrangeable; and a control system for controlling the actuation system to move the lens and the probe and to detect that a motion of the lens and the probe is prevented by the probe hitting a surface fixed in relation to the image sensor.
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公开(公告)号：US20220141388A1
公开(公告)日：2022-05-05
申请号：US17498225
申请日：2021-10-11
Applicant: Axis AB
Inventor： Stefan LUNDBERG , Jonas HJELMSTRÖM
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：US20210181122A1
公开(公告)日：2021-06-17
申请号：US16950927
申请日：2020-11-18
Applicant: Axis AB
Inventor： Stefan LUNDBERG , Jonas HJELMSTRÖM
Abstract: Methods and apparatus, including computer program products, for determining a presence of an object located close to a lens (301) of a camera monitoring a scene. A first infrared illumination source (302) arranged to illuminate the scene from a first angle is activated. A first image (304) is acquired by the image capturing device (300). The first infrared illumination source (302) is deactivated, and a second infrared illumination source (306) arranged to illuminate the scene from a second angle is activated. A second image (308) is acquired by the image capturing device (300). Intensity information of the first image (304) and the second image (308) is compared to determine the presence of an object located close to the lens (301).
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