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公开(公告)号：US11544878B2
公开(公告)日：2023-01-03
申请号：US17462481
申请日：2021-08-31
Applicant: Axis AB
Inventor： Johan Nyström , Johan Förberg , Song Yuan
IPC: G06V10/00 , G06T9/00 , H04N19/105 , H04N19/132 , H04N19/137 , H04N19/159 , H04N19/176 , H04N19/182
Abstract: Image encoding within a pixelated privacy mask area is adapted in order to reduce flickering during movement of a camera. Motion vectors are set equal to the movement of the camera, and residuals are set to zero, thereby encoding pixel blocks within the privacy mask area as copies of corresponding pixel blocks in a reference image.
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公开(公告)号：US11363201B2
公开(公告)日：2022-06-14
申请号：US17237246
申请日：2021-04-22
Applicant: Axis AB
Inventor： Johan Nyström , Song Yuan
Abstract: Methods and apparatus, including computer program products, for selecting a cropping area in a sequence of images captured by a camera. First external motion data including data of external factors affecting movement of the camera is correlated with internal motion data describing a movement of the camera. The first external motion data and the internal motion data are obtained during a first time interval. Second external motion data is obtained during a second time interval subsequent to the first time interval. A sequence of images being captured during a third time interval is stabilized by selecting a cropping area based on the correlation and the second external motion data. The cropping area remains constant and maximized in size with respect to the field of view of the images during the third time interval. The third time interval is subsequent to, or partly overlapping with, the second time interval.
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公开(公告)号：US10812709B2
公开(公告)日：2020-10-20
申请号：US16220997
申请日：2018-12-14
Applicant: Axis AB
Inventor： Johan Nyström , Kent Fransson
IPC: H04N5/225 , H04N5/232 , G06F1/3234 , H04N7/18 , H04W52/02 , G06F1/3203
Abstract: A power control system for controlling operation of a first battery-powered device positioned at a remote location from a camera. The power control system includes a receiving module, a retrieving module, a comparison module, and a transmission module. The receiving module is configured to receive at least one of a pan angle and a tilt angle of the camera indicative of a field of view. The retrieving module is configured to retrieve a position of the first battery-powered device. The comparison module is configured to compare the pan angle and the tilt angle with the position of the first battery-powered device, and determine whether the first battery-powered device is positioned within the field of view of the camera based on the comparison. The transmission module is configured to transmit instructions to control power consumption of the first battery-powered device, based on the determination.
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公开(公告)号：US10757318B2
公开(公告)日：2020-08-25
申请号：US16220906
申请日：2018-12-14
Applicant: Axis AB
Inventor： Dennis Nilsson , Björn Benderius , Johan Jeppsson , Johan Nyström
Abstract: A method for determining a local contrast value for a digital image captured by an image sensor in a camera comprising: applying an edge detection algorithm to image data of the digital image, thereby obtaining a data set pertaining to edges in the digital image; calculating, based on said data set, an edge occurrence value for the digital image; estimating, based on image data of the digital image and a noise model of the image sensor, an estimated image sensor noise for the digital image; and computing the local contrast value as a relationship between the edge occurrence value of the digital image and the expected edge occurrence value for the digital image. A method for adjusting a focus setting of a camera using the local contrast value for images captured by the camera.
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Patent Agency Ranking
5.发明申请公开(公告)号：US20190340731A1
公开(公告)日：2019-11-07
申请号：US16393916
申请日：2019-04-24
Applicant: Axis AB
Inventor： Johan Nyström , Song Yuan , Björn Ardö
Abstract: Methods and devices for protecting personal privacy in captured image data by controlling privacy masking of an image, where the degree of blurring to be applied to a privacy area of the image depends on a threshold distance from the image capturing device, and the spatial resolution of content of the scene at this distance in the image.
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公开(公告)号：US20190199923A1
公开(公告)日：2019-06-27
申请号：US16220997
申请日：2018-12-14
Applicant: Axis AB
Inventor： Johan Nyström , Kent Fransson
IPC: H04N5/232
CPC classification number: H04N5/23241 , G06F1/3203 , G06F1/325 , H04N5/23216 , H04N5/23299 , H04N7/18 , H04W52/0225 , H04W52/0254
Abstract: A power control system for controlling operation of a first battery-powered device positioned at a remote location from a camera. The power control system includes a receiving module, a retrieving module, a comparison module, and a transmission module. The receiving module is configured to receive at least one of a pan angle and a tilt angle of the camera indicative of a field of view. The retrieving module is configured to retrieve a position of the first battery-powered device. The comparison module is configured to compare the pan angle and the tilt angle with the position of the first battery-powered device, and determine whether the first battery-powered device is positioned within the field of view of the camera based on the comparison. The transmission module is configured to transmit instructions to control power consumption of the first battery-powered device, based on the determination.
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公开(公告)号：US11765459B2
公开(公告)日：2023-09-19
申请号：US17531995
申请日：2021-11-22
Applicant: Axis AB
Inventor： Tor Nilsson , Johan Förberg , Toivo Henningsson , Johan Nyström
CPC classification number: H04N23/683 , H04N23/6811 , H04N23/6812
Abstract: A method for image stabilization of a video stream captured by a panable and/or tiltable video camera the method comprising: generating a motor position signal, Y1, of a pan/tilt motor of the video camera; generating a gyro signal, Y2, of a gyroscopic sensor of the video camera; generating a reference signal from a predetermined movement curve of the pan/tilt motor of the video camera, the reference signal is a reference on how a pan/tilt operation of the video camera is made without shaking of the video camera; from the motor position signal, Y1, and the gyro signal, Y2, generating a combined signal, Y, according to: Y=F1*Y1+F2*Y2, wherein F1 is a low pass filter and F2 is a high pass filter; and performing image stabilization on the video stream based on a difference between the combined signal, Y, and the reference signal.
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公开(公告)号：US10755388B2
公开(公告)日：2020-08-25
申请号：US16393916
申请日：2019-04-24
Applicant: Axis AB
Inventor： Johan Nyström , Song Yuan , Björn Ardö
Abstract: Methods and devices for protecting personal privacy in captured image data by controlling privacy masking of an image, where the degree of blurring to be applied to a privacy area of the image depends on a threshold distance from the image capturing device, and the spatial resolution of content of the scene at this distance in the image.
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公开(公告)号：US20190199933A1
公开(公告)日：2019-06-27
申请号：US16220906
申请日：2018-12-14
Applicant: Axis AB
Inventor： Dennis Nilsson , Björn Benderius , Johan Jeppsson , Johan Nyström
Abstract: A method for determining a local contrast value for a digital image captured by an image sensor in a camera comprising: applying an edge detection algorithm to image data of the digital image, thereby obtaining a data set pertaining to edges in the digital image; calculating, based on said data set, an edge occurrence value for the digital image; estimating, based on image data of the digital image and a noise model of the image sensor, an estimated image sensor noise for the digital image; and computing the local contrast value as a relationship between the edge occurrence value of the digital image and the expected edge occurrence value for the digital image. A method for adjusting a focus setting of a camera using the local contrast value for images captured by the camera.
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