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1. 发明授权

US11055976B2 Using a skip block mask to reduce bitrate from a monitoring camera 有权
公开(公告)号：US11055976B2
公开(公告)日：2021-07-06
申请号：US16947659
申请日：2020-08-11
申请人： Axis AB
发明人： Johan Nystrom , Xing Danielsson Fan
IPC分类号： G08B13/196 , H04N19/166 , H04N19/167 , H04N19/176 , G06T7/11
摘要： Methods and apparatus, including computer program products, implementing and using techniques for reducing bitrate from a monitoring camera. A first input is received that identifies first regions of an image representing a camera field of view. The first regions contribute significantly to the bitrate. A second input is received that identifies second regions of the image. The second regions contain information that is deemed to be of little visual interest to a user of the monitoring camera. Third regions of the image are determined. The third regions are regions where the first and second regions overlap at least in part. Video encoder settings are applied to force skip blocks in at least some of the third regions, thereby reducing contributions to the bitrate from the third regions.

2. 发明授权

US10349081B2 Method and device for real-time encoding 有权
公开(公告)号：US10349081B2
公开(公告)日：2019-07-09
申请号：US14958346
申请日：2015-12-03
申请人： Axis AB
发明人： Johan Nystrom
IPC分类号： H04N19/593 , G08B13/24 , H04N19/114 , H04N19/137 , H04N19/177 , H04N19/527
摘要： The present invention relates to a method, an encoder, a computer program product, and a system for real-time encoding. The encoder is arranged to receive movement information about a movement of a camera, the encoder being arranged to encode, in real-time, a video stream acquired by the camera during the movement of the camera, wherein the encoder is arranged to encode based on said movement information. The movement information may be stored in a memory.

3. 发明申请

US20210090413A1 USING A SKIP BLOCK MASK TO REDUCE BITRATE FROM A MONITORING CAMERA 有权
公开(公告)号：US20210090413A1
公开(公告)日：2021-03-25
申请号：US16947659
申请日：2020-08-11
申请人： Axis AB
发明人： Johan Nystrom , Xing Danielsson Fan
IPC分类号： G08B13/196 , G06T7/11 , H04N19/166 , H04N19/167 , H04N19/176
摘要： Methods and apparatus, including computer program products, implementing and using techniques for reducing bitrate from a monitoring camera. A first input is received that identifies first regions of an image representing a camera field of view. The first regions contribute significantly to the bitrate. A second input is received that identifies second regions of the image. The second regions contain information that is deemed to be of little visual interest to a user of the monitoring camera. Third regions of the image are determined. The third regions are regions where the first and second regions overlap at least in part. Video encoder settings are applied to force skip blocks in at least some of the third regions, thereby reducing contributions to the bitrate from the third regions.

4. 发明申请

US20180074287A1 METHOD OF PERFORMING AUTOFOCUS, AUTOFOCUS SYSTEM, AND CAMERA COMPRISING AN AUTOFOCUS MODULE 审中-公开
公开(公告)号：US20180074287A1
公开(公告)日：2018-03-15
申请号：US15697028
申请日：2017-09-06
申请人： Axis AB
发明人： Johan Nystrom , Can Xu
IPC分类号： G02B7/28 , H04N5/232 , G02B7/09 , G06K9/00
CPC分类号： G02B7/282 , G02B7/09 , G02B7/285 , G03B13/36 , G03B2205/0046 , G06K9/00624 , H04N5/232121 , H04N5/23296
摘要： A method of autofocusing a camera during a zooming operation is disclosed, comprising zooming the lens to a first zoom position, measuring a first object distance from the camera to an object on which to focus, determining a first focus start position using the first object distance, performing a first autofocusing operation using the first focus start position as a starting point, thereby determining a first determined focus position. A first lookup object distance is determined based on the first determined focus position. A first correction factor is calculated as a ratio between the first lookup object distance and the first object distance. The lens is zoomed to a second zoom position, and a second focus position is determined using a second object distance calculated as a product of the first object distance and a second correction factor based on a ratio of depths of field at the second and first zoom positions.

5. 发明授权

US10324268B2 Method of performing autofocus, autofocus system, and camera comprising an autofocus module 有权
公开(公告)号：US10324268B2
公开(公告)日：2019-06-18
申请号：US15697028
申请日：2017-09-06
申请人： Axis AB
发明人： Johan Nystrom , Can Xu
IPC分类号： G02B7/28 , G02B7/09 , G06K9/00 , H04N5/232 , G03B13/36
摘要： Autofocusing a camera while zooming may include zooming the lens to a first zoom position, measuring a first object distance from the camera to an object on which to focus, determining a first focus start position using the first object distance, performing a first autofocus using the first focus start position as a starting point, thereby determining a first focus position. A first lookup object distance may be determined based on the first determined focus position. A first correction factor may be calculated as a ratio between the first lookup object distance and the first object distance. The lens may be zoomed to a second zoom position, and a second focus position may be determined using a second object distance based on the first object distance and a second correction factor based on depths of field at the second and first zoom positions.

6. 发明授权

US09270893B2 Monitoring method and camera 有权
标题翻译：监控方法和摄像头
公开(公告)号：US09270893B2
公开(公告)日：2016-02-23
申请号：US14133105
申请日：2013-12-18
申请人： Axis AB
发明人： Johan Nystrom
IPC分类号： H04N5/235 , H04N5/232 , H04N7/18
CPC分类号： H04N5/235 , H04N5/23212 , H04N7/183 , H04N7/188
摘要： A monitoring camera arranged to monitor a scene and a method of controlling camera settings for a monitoring camera arranged to monitor a scene wherein images are captured of different parts of the scene by altering a field of view of the camera, wherein data defining a camera settings control area within the scene is accessed, and it is determined if there is an overlapping region between a current field of view of the camera and the camera settings control area, and if there is an overlapping region, camera settings are controlled based on the overlapping region.
摘要翻译：一种用于监视场景的监视摄像机以及控制用于监视摄像机的摄像机设置的方法，所述监视摄像机布置成通过改变摄像机的视场来监控场景的不同部分捕获图像的场景，其中定义摄像机设置的数据访问场景内的控制区域，并且确定在相机的当前视野与照相机设置控制区域之间是否存在重叠区域，并且如果存在重叠区域，则基于重叠来控制照相机设置地区。

7. 发明授权

US10580121B2 Image noise reduction based on a modulation transfer function of a camera dome 有权
公开(公告)号：US10580121B2
公开(公告)日：2020-03-03
申请号：US15815168
申请日：2017-11-16
申请人： Axis AB
发明人： Bjorn Ardo , Johan Nystrom
IPC分类号： G06T5/00 , H04N5/217 , G06T5/20 , G06T7/80 , H04N5/232
摘要： A method and apparatus are disclosed. The method may include determining a current zoom value of a camera and determining a first modulation transfer function of a transparent dome of the camera. The method may include applying a first low-pass filter to an image captured by the camera based on the current zoom value and the first modulation transfer function of the transparent dome.

8. 发明申请

US20190147574A1 IMAGE NOISE REDUCTION BASED ON A MODULATION TRANSFER FUNCTION OF A CAMERA DOME 审中-公开
公开(公告)号：US20190147574A1
公开(公告)日：2019-05-16
申请号：US15815168
申请日：2017-11-16
申请人： Axis AB
发明人： Bjorn Ardo , Johan Nystrom
IPC分类号： G06T5/20 , G06T5/00 , G06T7/80
摘要： A method and apparatus are disclosed. The method may include determining a current zoom value of a camera and determining a first modulation transfer function of a transparent dome of the camera. The method may include applying a first low-pass filter to an image captured by the camera based on the current zoom value and the first modulation transfer function of the transparent dome.

9. 发明申请

US20130169803A1 METHOD AND MOBILE UNIT FOR FACILITATING INSTALLATION OF A SURVEILLANCE CAMERA 有权
标题翻译：方法和移动装置，用于安装监视摄像机
公开(公告)号：US20130169803A1
公开(公告)日：2013-07-04
申请号：US13728321
申请日：2012-12-27
申请人： Axis AB
发明人： Bjorn ARDO , Johan Nystrom
IPC分类号： H04N7/18
CPC分类号： H04N7/18 , G08B13/1968 , H04N5/23216 , H04N5/23296 , H04N7/183 , H04N17/002
摘要： A method and mobile unit facilitate installation of a surveillance camera for monitoring an object of interest in a scene. The surveillance camera acquires a zoomed out image of the scene. The zoomed out image is displayed in a display wherein the zoomed out image has a zoomed out center point. An indicator overlaid on the displayed zoomed out image is displayed in the display, wherein the indicator and the zoomed out center point are displaced in relation to each other by a deviation. The indicator indicates the position of a zoomed in center point of a zoomed in image of the scene. The surveillance camera is directed so that the position of the object of interest and the indicator coincide so that the object of interest is included in a zoomed in image of the scene.
摘要翻译：方法和移动单元便于安装用于监视场景中的感兴趣对象的监视摄像机。监控摄像机获取场景的缩小图像。缩小的图像被显示在显示器中，其中缩小的图像具有缩小的中心点。在显示器上显示覆盖在所显示的缩小图像上的指示符，其中指示符和缩小的中心点相对于彼此偏移而偏移。指示器指示放大的场景的放大图像的中心点的位置。引导监视摄像机使得感兴趣的对象的位置和指示符重合，使得感兴趣的对象被包括在场景的放大图像中。

10. 发明授权

US09906724B2 Method and device for setting a focus of a camera 有权
公开(公告)号：US09906724B2
公开(公告)日：2018-02-27
申请号：US15251271
申请日：2016-08-30
申请人： AXIS AB
发明人： Dennis Nilsson , Johan Nystrom , Bjorn Benderius
IPC分类号： H04N5/232
CPC分类号： H04N5/23254 , H04N5/23212 , H04N5/23258 , H04N5/2329 , H04N5/23296
摘要： The present invention relates generally to auto focus algorithms for setting a focus of a camera. More specifically, the present invention relates to a method (600) and device for setting a focus of a camera wherein a camera motion level of the camera is continuously measured (S604) during the read-out of pixel data by a rolling shutter image sensor and wherein the auto focus algorithm uses weighted focus measures which are calculated (S612) using the continuously measured camera motion levels.

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