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1. 发明申请

US20220368534A1 DEVICE AND A METHOD FOR SIGNING A VIDEO SEGMENT COMPRISING ONE OR MORE GROUPS OF PICTURES 有权
公开(公告)号：US20220368534A1
公开(公告)日：2022-11-17
申请号：US17710151
申请日：2022-03-31
申请人： Axis AB
发明人： Stefan LUNDBERG , Viktor EDPALM
IPC分类号： H04L9/32 , H04N21/835
摘要： A device, and method of signing a video segment comprising one or more groups of pictures, GOPs, wherein each GOP comprises a header and one or more frames, are disclosed. For each of the one or more GOPs a GOP hash is produced and the GOP hash is digitally signed by means of a digital signature to produce a signed GOP hash. For each GOP except a last GOP of the one or more GOPs the respective signed GOP hash is saved in the header of a subsequent GOP. An additional GOP is added to the video segment after the last GOP of the one or more GOPs, wherein the additional GOP comprising a header and one or more frames. The signed GOP hash of the last GOP of the one or more GOPs is saved in the header of the additional GOP.

2. 发明申请

US20210097695A1 METHOD AND DEVICE FOR IMAGE ANALYSIS 有权
公开(公告)号：US20210097695A1
公开(公告)日：2021-04-01
申请号：US17026321
申请日：2020-09-21
申请人： Axis AB
发明人： Stefan LUNDBERG , Song YUAN
IPC分类号： G06T7/20 , G06T5/20 , G06T7/70 , G06T7/194
摘要： A method includes defining a background model of the video sequence by applying a first algorithm, the background model defining whether that spatial area belongs to a background or a foreground in the video sequence, wherein a detected significant change in image data in a spatial area in an image frame relative image data in said spatial area in a preceding image frame is indicative of said spatial area belonging to the foreground; indicating that an idle area of the defined foreground areas is to be transitioned from foreground to background; and determining whether the idle area is to be transitioned by applying a second algorithm to image data of an image frame of the video sequence, the image data at least partly corresponding to the idle area; wherein if the idle area is not to be transitioned, maintaining the idle area as a foreground area in the background model.

3. 发明申请

US20230112135A1 SIGNED VIDEO DATA WITH LINKED HASHES 有权
公开(公告)号：US20230112135A1
公开(公告)日：2023-04-13
申请号：US17881983
申请日：2022-08-05
申请人： Axis AB
发明人： Björn VÖLCKER , Stefan LUNDBERG
IPC分类号： G06T1/00 , H04N19/50
摘要： A method of signing prediction-coded video data, comprising: obtaining a coded video sequence including at least one I-frame (I), which contains independently decodable image data, and at least one predicted frame (P1, P2, P3, P4), which contains image data decodable by reference to at least one other frame; generating a fingerprint (HI) of each I-frame; generating a fingerprint (HP) of each predicted frame by hashing a combination of data derived from the predicted frame and data derived from an I-frame to which the predicted frame refers directly or indirectly, wherein the fingerprint of the predicted frame is independent of any further predicted frame to which the predicted frame refers directly or indirectly; and providing a signature of the video sequence including the generated fingerprints.

4. 发明申请

US20220182591A1 DEVICE AND A METHOD OF ENCODING IMAGES INCLUDING A PRIVACY FILTER 有权
公开(公告)号：US20220182591A1
公开(公告)日：2022-06-09
申请号：US17528669
申请日：2021-11-17
申请人： Axis AB
发明人： Carl-Axel ALM , Stefan LUNDBERG
IPC分类号： H04N9/74 , G06T9/00 , G06T5/20 , G06K9/20 , G06K9/00 , H04N5/232 , G06T7/10 , H04N9/68
摘要： 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.

5. 发明申请

US20210195075A1 CAMERA AND METHOD FOR INTRODUCING LIGHT PULSES IN AN IMAGE STREAM 有权
公开(公告)号：US20210195075A1
公开(公告)日：2021-06-24
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： H04N5/225 , 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.

6. 发明申请

US20190007665A1 METHOD FOR ENHANCING COLOR IMAGES, AND AN ASSEMBLY PERFORMING SUCH METHOD 审中-公开
公开(公告)号：US20190007665A1
公开(公告)日：2019-01-03
申请号：US16009247
申请日：2018-06-15
申请人： Axis AB
发明人： Jonas HJELMSTRÖM , Stefan LUNDBERG , Ingemar LARSSON
IPC分类号： H04N9/64 , H04N5/33 , H04N5/225 , H04N5/238
摘要： 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.

7. 发明申请

US20230114200A1 VIDEO REPLAY ATTACK DETECTION 有权
公开(公告)号：US20230114200A1
公开(公告)日：2023-04-13
申请号：US17957775
申请日：2022-09-30
申请人： Axis AB
发明人： Björn VÖLCKER , Stefan LUNDBERG
IPC分类号： H04L9/40 , G08B13/196
摘要： The present application relates to detecting if video images captured by a camera are depicting a live scene or a recorded video played on a monitor, display or computer screen, which is setup to hide the scene from the camera. Metadata regarding the mapping operation used to transform image data between different intensity ranges, or bit depths, is included with the video and evaluated in order to determine if a video replay attack has taken place.

8. 发明申请

US20150156423A1 SYSTEM FOR FOLLOWING AN OBJECT MARKED BY A TAG DEVICE WITH A CAMERA 审中-公开
标题翻译：用于跟踪具有相机的标签设备标记的对象的系统
公开(公告)号：US20150156423A1
公开(公告)日：2015-06-04
申请号：US14531137
申请日：2014-11-03
申请人： AXIS AB
发明人： Stefan LUNDBERG
IPC分类号： H04N5/232
CPC分类号： H04N5/23296 , H04N5/232 , H04N5/23203
摘要： There is provided a system, including a tag device and a camera arrangement, for following an object marked by the tag device with a camera. The tag device may measure a horizontal plane position and an altitude of the tag device according to different measurement principles, and transmit the measured values to a camera arrangement. The camera arrangement may measure a horizontal plane position and an altitude related to the camera according to different measurement principles. The camera arrangement may then control the pan and tilt settings of the camera based on differences in horizontal plane positions and altitudes between the camera and the tag device such that the camera is oriented in the direction of the tag device.
摘要翻译：提供了一种包括标签装置和相机布置的系统，用于利用相机跟踪由标签装置标记的对象。标签装置可以根据不同的测量原理测量标签装置的水平面位置和高度，并将测量值发送到相机装置。照相机装置可以根据不同的测量原理测量与摄像机相关的水平面位置和高度。相机配置然后可以基于相机和标签装置之间的水平面位置和高度的差异来控制相机的摇摄和倾斜设置，使得照相机朝向标签装置的方向。

9. 发明申请

US20140160308A1 PAN-TILT CAMERA 审中-公开
标题翻译： PAN-TILT相机
公开(公告)号：US20140160308A1
公开(公告)日：2014-06-12
申请号：US14179809
申请日：2014-02-13
申请人： AXIS AB
发明人： Carl-Axel ALM , Stefan LUNDBERG , Willy SAGEFALK
IPC分类号： H04N5/232
CPC分类号： H04N5/23203 , G02B6/3604 , H04N5/2251
摘要： A pan-tilt camera is arranged to include a camera head, a stationary unit, an intermediate member arranged between the camera head and the stationary unit, a first rotary joint rotatably connecting the camera head to the intermediate member, and a second rotary joint, rotatably connecting the intermediate member to the stationary unit. A communication path is provided between the camera head and the stationary unit, including an optical waveguide arranged between the camera head and the stationary unit. The optical waveguide has a first end positioned at the first rotary joint to receive light from the camera head through the first rotary joint. The other end of the waveguide is positioned at the second rotary joint and is arranged to send light to the stationary unit through the second rotary joint.
摘要翻译：俯仰摄像机被配置为包括相机头，固定单元，布置在相机头和固定单元之间的中间构件，将照相机头可旋转地连接到中间构件的第一旋转接头和第二旋转接头，将中间构件可旋转地连接到固定单元。在相机头和固定单元之间提供通信路径，包括布置在相机头和固定单元之间的光波导。光波导具有位于第一旋转接头处的第一端，以通过第一旋转接头接收来自照相机头的光。波导的另一端位于第二旋转接头处，并且布置成通过第二旋转接头将光发送到固定单元。

10. 发明申请

US20140152892A1 METHOD AND APPARATUS FOR DE-INTERLACING VIDEO 有权
标题翻译：用于去交互视频的方法和装置
公开(公告)号：US20140152892A1
公开(公告)日：2014-06-05
申请号：US14174393
申请日：2014-02-06
申请人： AXIS AB
发明人： Stefan LUNDBERG
IPC分类号： H04N7/01
CPC分类号： H04N7/0117 , H04N7/012
摘要： A method for de-interlacing interlaced video includes receiving a first video field and a second video field of an interlaced video frame, generating a first video frame from the first video field and a first synthesized video field, where video data of the first synthesized video field is based exclusively on video data of the first and second video fields, generating a second video frame from the second video field and a second synthesized video field, where video data of the second synthesized video field is based exclusively on the video data of the first and second video fields, and outputting two de-interlaced video frames for every received interlaced video frame. The first (second) synthesized video field is generated by combining image data from the second (first) video field with image data from corresponding lines of an up-scaled first (second) field generated by a scaler.
摘要翻译：一种用于去隔行隔行扫描视频的方法包括接收隔行视频帧的第一视频场和第二视频场，从第一视频场产生第一视频帧和第一合成视频场，其中第一合成视频的视频数据字段仅基于第一和第二视频字段的视频数据，从第二视频场产生第二视频帧和第二合成视频字段，其中第二合成视频字段的视频数据完全基于视频数据第一和第二视频场，并且为每个接收到的隔行视频帧输出两个去隔行视频帧。第一（第二）合成视频场是通过将来自第二（第一）视频场的图像数据与由缩放器产生的高比例缩放的第一（第二）场的相应行的图像数据组合而产生的。

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