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22 条记录 (耗时 0.014 秒)

    Close object detection for monitoring cameras
    1.
    发明授权
    Close object detection for monitoring cameras 有权

    公开(公告)号：US11592404B2

    公开(公告)日：2023-02-28

    申请号：US16950927

    申请日：2020-11-18

    申请人： Axis AB

    发明人： Stefan Lundberg ,  Jonas Hjelmström

    IPC分类号： G01N21/94 ,  G06T7/70 ,  G06T7/00

    摘要： 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).

    Camera and method for introducing light pulses in an image stream
    2.
    发明授权
    Camera and method for introducing light pulses in an image stream 有权

    公开(公告)号：US11477357B2

    公开(公告)日：2022-10-18

    申请号：US17082117

    申请日：2020-10-28

    申请人： Axis AB

    发明人： Stefan Lundberg ,  Jonas Hjelmström

    IPC分类号： H04N5/30 ,  H04N5/225 ,  H04N9/04 ,  H04N7/18

    摘要： 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.

    IR-filter arrangement
    3.
    发明授权
    IR-filter arrangement 有权

    公开(公告)号：US10386554B2

    公开(公告)日：2019-08-20

    申请号：US15856993

    申请日：2017-12-28

    申请人： AXIS AB

    发明人： Jonas Hjelmström ,  Stefan Lundberg

    IPC分类号： G03B11/00 ,  H04N5/238 ,  G02B5/20 ,  H04N5/225 ,  H04N5/33 ,  G03B9/06 ,  H04N5/232 ,  G03B7/00

    摘要： An infrared (IR) filter arrangement for a camera having an associated IR illuminator, the arrangement comprising: a fixedly arranged bandpass IR filter filtering out IR frequencies other than those from the IR illuminator; and an IR cut filter at least blocking any IR wavelength transmitted by the fixed band-pass filter, the IR filter being integrated in a diaphragm of the camera, such that closing of the diaphragm aperture entails an increased relative proportion of the diaphragm aperture being covered by the IR cut filter, and opening of the diaphragm aperture entails a decreased relative proportion of the diaphragm aperture being covered by the IR cut filter.

    IR-FILTER ARRANGEMENT
    4.
    发明申请
    IR-FILTER ARRANGEMENT 审中-公开

    公开(公告)号：US20180180783A1

    公开(公告)日：2018-06-28

    申请号：US15856993

    申请日：2017-12-28

    申请人： AXIS AB

    发明人： Jonas Hjelmström ,  Stefan Lundberg

    IPC分类号： G02B5/20 ,  G03B11/00 ,  H04N5/238 ,  H04N5/232

    CPC分类号： G02B5/208 ,  G03B7/00 ,  G03B9/06 ,  G03B11/00 ,  H04N5/2254 ,  H04N5/2256 ,  H04N5/23245 ,  H04N5/238 ,  H04N5/33 ,  H04N5/332

    摘要： An infrared (IR) filter arrangement for a camera having an associated IR illuminator, the arrangement comprising: a fixedly arranged bandpass IR filter filtering out IR frequencies other than those from the IR illuminator; and an IR cut filter at least blocking any IR wavelength transmitted by the fixed band-pass filter, the IR filter being integrated in a diaphragm of the camera, such that closing of the diaphragm aperture entails an increased relative proportion of the diaphragm aperture being covered by the IR cut filter, and opening of the diaphragm aperture entails a decreased relative proportion of the diaphragm aperture being covered by the IR cut filter.

    Method and system for image stabilization
    8.
    发明授权
    Method and system for image stabilization 有权

    公开(公告)号：US10075642B2

    公开(公告)日：2018-09-11

    申请号：US15049952

    申请日：2016-02-22

    申请人： AXIS AB

    发明人： Jonas Hjelmström ,  Andreas Nilsson

    IPC分类号： H04N5/232

    CPC分类号： H04N5/23287 ,  H04N5/23212 ,  H04N5/23254 ,  H04N5/23258 ,  H04N5/23267

    摘要： In a method for image stabilization a number of operations are performed to stabilize an image and to output a focal length value. The steps include capturing video by means of a video camera with unknown focal length running an image stabilization process operating on an input from a hardware detector detecting the displacement of the camera and on an adjustable focal length value. Inter-image displacement is corrected based on the input from the hardware detector and the adjustable focal length value. By evaluating the displacement and adjusting the focal length value until a satisfactory image stabilization is achieved a value of the focal length may be output.

    METHOD FOR SEQUENTIAL CONTROL OF IR-FILTER, AND AN ASSEMBLY PERFORMING SUCH METHOD
    9.
    发明申请
    METHOD FOR SEQUENTIAL CONTROL OF IR-FILTER, AND AN ASSEMBLY PERFORMING SUCH METHOD 审中-公开

    公开(公告)号：US20180188634A1

    公开(公告)日：2018-07-05

    申请号：US15857077

    申请日：2017-12-28

    申请人： AXIS AB

    发明人： Stefan Lundberg ,  Jonas Hjelmström

    IPC分类号： G03B7/091 ,  G03B9/06

    CPC分类号： G03B7/091 ,  G03B7/095 ,  G03B9/06 ,  G03B11/00

    摘要： 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.

    CAMERA AND METHOD OF PRODUCING COLOR IMAGES
    10.
    发明申请
    CAMERA AND METHOD OF PRODUCING COLOR IMAGES 审中-公开

    公开(公告)号：US20180184054A1

    公开(公告)日：2018-06-28

    申请号：US15857127

    申请日：2017-12-28

    申请人： Axis AB

    发明人： Stefan Lundberg ,  Jonas Hjelmström

    IPC分类号： H04N9/07 ,  H04N5/33 ,  G02B5/20 ,  G02B7/00

    CPC分类号： H04N9/07 ,  G02B5/201 ,  G02B5/208 ,  G02B7/006 ,  G03B7/00 ,  G03B11/00 ,  H04N5/2254 ,  H04N5/332 ,  H04N5/3696

    摘要： 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.