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公开(公告)号：US20220182591A1
公开(公告)日：2022-06-09
申请号：US17528669
申请日：2021-11-17
Applicant: Axis AB
Inventor： Carl-Axel ALM , Stefan LUNDBERG
Abstract: An image processing device a camera and a method for of encoding images captured by a camera are disclosed. For each image of an image sequence captured by the camera, the image is pre-processed by filtering the image by applying a privacy filter, the privacy filter being configured to distort the image in such a way that privacy is achieved in the filtered image, and, for at least a subset of the filtered images, by colour revising the filtered image by changing colour of pixels of a plurality of scattered areas of the filtered image such that a respective colour of one or more pixels of each area of the plurality of scattered areas represents one or more original colours of one or more pixels before filtering at a location of that area in the filtered image. The pre-processed images are then encoded into an encoded video stream.
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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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公开(公告)号：US20250168475A1
公开(公告)日：2025-05-22
申请号：US18884873
申请日：2024-09-13
Applicant: Axis AB
Inventor： Stefan LUNDBERG , Kajsa Larsson , Kent Fransson
Abstract: A method and a video capturing system for controlling at least one infrared (IR) illumination source, illuminating an area captured by a camera, the method comprising modulating emission from the IR illumination source between first and second emission intensities at a first frequency during a first predetermined time period. Upon capturing images using an image sensor of the camera during the first predetermined time period, determining a radiation level indicator for each of a plurality of images captured by the image sensor. Further, evaluating a sequence of determined radiation level indicators to determine whether a frequency resulting from the modulated emission at the first frequency is detected in the sequence of radiation level indicators. If the frequency resulting from the modulated emission at the first frequency is determined as not detected in the sequence of radiation level indicators, the IR illumination source is stopped.
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公开(公告)号：US20230116909A1
公开(公告)日：2023-04-13
申请号：US17870454
申请日：2022-07-21
Applicant: Axis AB
Inventor： Björn VÖLCKER , Stefan LUNDBERG
Abstract: A method of signing video data, comprising: obtaining video data representing a video sequence; obtaining a bitstring not extracted from the video data; generating a salt by hashing the bitstring, preferably using a secret hash function; generating a first/second fingerprint either by hashing a combination of the salt and a first/second portion of the video data, or by hashing a combination of the salt and a hash of a first/second portion of the video data; and providing a signature of the video data, which includes the first fingerprint. The first and second portions may encode consecutive time segments of the video sequence, such as consecutive frames.
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Patent Agency Ranking
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：US20210358088A1
公开(公告)日：2021-11-18
申请号：US17242324
申请日：2021-04-28
Applicant: Axis AB
Inventor： Stefan LUNDBERG , Song YUAN , Tim BORGLUND
Abstract: The present disclosure relates to a method performed by a background blurring system (1) for provision of a video compression stream from a video camera (2) adapted for capturing a scene. The background blurring system identifies (1001) in a first image of the scene, at a first point in time, at least a first pixel comprised in a background of the first image. The background blurring system further determines (1002) a blurred pixel value for the at least first pixel. Moreover, the background blurring system provides (1003), subsequent the first point in time, the blurred pixel value in the video compression stream. The background blurring system furthermore identifies (1004) in a second image of the scene, at a subsequent second point in time, that the at least first pixel has altered to be comprised in a foreground of the second image. Moreover, the background blurring system provides (1005) in the video compression stream, subsequent the second point in time—continuously and/or intermittently—identified non-blurred pixel values for the at least first pixel. The background blurring system further identifies (1006) in a third image of the scene, at a subsequent third point in time, that the at least first pixel has altered to be comprised in a background of the third image, wherein a value of the at least first pixel has remained unchanged from an intermediate point in time up to the third point in time. Furthermore, when the third point in time is within a predeterminable background merge time period from the intermediate point in time, the background blurring system provides (1007), subsequent the third point in time, the blurred pixel value in the video compression stream.
The disclosure also relates to a background blurring system in accordance with the foregoing, a video camera comprising such a background blurring system, and a respective corresponding computer program product and non-volatile computer readable storage medium.-
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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19.发明申请公开(公告)号：US20160050434A1
公开(公告)日：2016-02-18
申请号：US14919578
申请日：2015-10-21
Applicant: Axis AB
Inventor： Stefan LUNDBERG
IPC: H04N19/593 , H04N19/587 , H04N19/44 , H04N19/59
CPC classification number: H04N19/593 , G11B27/034 , H04N19/114 , H04N19/146 , H04N19/156 , H04N19/164 , H04N19/177 , H04N19/30 , H04N19/40 , H04N19/423 , H04N19/44 , H04N19/587 , H04N19/59 , H04N21/23406 , H04N21/23424 , H04N21/23439
Abstract: Systems and methods are provided for encoding raw image content encoded using one or more virtual intra-frames. In an exemplary method, a stream of video content may be encoded to generate compressed video data that includes an intra-flame and a plurality of corresponding inter-frames. The compressed video data may be stored within a buffer, and when the amount of data in the buffer exceeds a threshold value, a virtual intra-frame may be computed based on decoded inter-frame data. The virtual intra-frame may be output for storage in the buffer.
Abstract translation: 提供了用于编码使用一个或多个虚拟帧内编码的原始图像内容的系统和方法。 在示例性方法中，视频内容流可被编码以产生包括火焰内和多个相应帧间的压缩视频数据。 压缩视频数据可以存储在缓冲器中，并且当缓冲器中的数据量超过阈值时，可以基于解码的帧间数据来计算虚拟帧内帧。 可以输出虚拟帧内以存储在缓冲器中。
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公开(公告)号：US20240203457A1
公开(公告)日：2024-06-20
申请号：US18511001
申请日：2023-11-16
Applicant: Axis AB
Inventor： Stefan LUNDBERG , Björn VÖLCKER
IPC: G11B27/036 , G06F21/10
CPC classification number: G11B27/036 , G06F21/1062
Abstract: A signed video bitstream obtained by prediction coding of a video sequence includes data units and associated signature units, wherein each data unit represents at most one macroblock in a video frame of the video sequence, and each signature unit includes a digital signature of a bitstring derived from fingerprints of exactly one associated data unit each. The bitstream is edited by: receiving a request to substitute a region; determining a first set of macroblocks, in which said region is contained, and a second set of macroblocks referring to macroblocks in the first set; adding an archive object that includes fingerprints of a first and a second set of data units, which represent the first and second set of macroblocks; editing the first set of data units in accordance with the request to substitute; and re-encoding the second set of data units.
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