公开(公告)号：US20160165271A1

公开(公告)日：2016-06-09

申请号：US14958304

申请日：2015-12-03

Applicant: Axis AB

Inventor： Bjorn Ardo ,  Song Yuan

IPC: H04N21/234 ,  H04N21/24 ,  H04N21/242 ,  G06T7/20 ,  G06T7/40 ,  G06K9/46 ,  G06T7/00 ,  H04N21/61 ,  G06K9/62

CPC classification number: H04N21/23424 ,  G06K9/4652 ,  G06K9/4661 ,  G06K9/6215 ,  G06T7/20 ,  G06T7/73 ,  G06T7/90 ,  H04N21/23418 ,  H04N21/2402 ,  H04N21/242 ,  H04N21/4312 ,  H04N21/6125

Abstract: The present invention relates generally to video communication systems, and more specifically to a method and device for adjusting properties of a graphical overlay for a video stream, the adjusted properties being at least one of a position, a degree of animation and a color composition of the graphical overlay and the adjustment is based on a scene depicted by the time period of the video stream. The adjustment is performed if an estimated bitrate for transmitting an encoded bitstream comprising the time period of the video stream and the graphical overlay exceeds a predetermined upper threshold bitrate for transmitting an encoded single bitstream comprising the time period of the video stream and the graphical overlay.

Abstract translation: 本发明一般涉及视频通信系统，更具体地，涉及一种用于调整视频流的图形覆盖的属性的方法和装置，所调整的属性是以下各项中的至少一个：动画的位置，程度和颜色组合 图形叠加和调整基于由视频流的时间段描绘的场景。 如果用于发送包括视频流的时间段和图形叠加层的编码比特流的估计比特率超过预定的上限阈值比特率，则用于发送包括视频流的时间段和图形叠加的编码单个比特流的估计比特率被执行。

公开(公告)号：US20160165171A1

公开(公告)日：2016-06-09

申请号：US14956519

申请日：2015-12-02

Applicant: Axis AB

Inventor： Bjorn Ardo ,  Song Yuan

IPC: H04N5/445 ,  G06T7/20 ,  H04N5/265 ,  G06T13/80

CPC classification number: H04N5/44504 ,  G06T7/20 ,  G06T13/80 ,  G06T2207/10016 ,  H04N5/265 ,  H04N21/4312

Abstract: The present invention relates generally to video communication systems, and more specifically to a method and device for determining a degree of animation of a graphical overlay for a video stream based on a degree of movement in the video stream.

Abstract translation: 本发明一般涉及视频通信系统，更具体地涉及一种用于基于视频流中的移动程度来确定用于视频流的图形叠加的动画程度的方法和装置。

公开(公告)号：US11989869B2

公开(公告)日：2024-05-21

申请号：US17380127

申请日：2021-07-20

Applicant: Axis AB

Inventor： Viktor Edpalm ,  Song Yuan

IPC: G06K9/00 ,  G06T1/00 ,  G06T7/00 ,  G06T7/20

CPC classification number: G06T7/0002 ,  G06T1/0028 ,  G06T7/20 ,  G06T2207/10016 ,  G06T2207/30168 ,  G06T2207/30232

Abstract: A method for determining authenticity of a video in a surveillance system, whereby a sequence of image frames of a scene is captured, and an object is tracked. A current image quality measure in an image area corresponding to the tracked object is determined in at least a first and second image frame. chosen such that the object has moved at least a predetermined distance between the first and second image frames. A current image quality measure variation for the object is determined, the image quality measure variation describing the image quality measure as a function of position of the object in the image frames. The current image quality measure variation is compared to a known image quality measure variation. In response to the current image quality measure variation deviating from the known pixel density variation by less than a predetermined amount, it is determined that the video is authentic.

公开(公告)号：US11601674B2

公开(公告)日：2023-03-07

申请号：US17175423

申请日：2021-02-12

Applicant: Axis AB

Inventor： Viktor Edpalm ,  Song Yuan

IPC: H04N19/593 ,  H04N19/172 ,  H04N19/159 ,  H04N19/17 ,  H04N19/167 ,  G06T9/00 ,  H04N19/503 ,  H04N19/61 ,  H04N19/105 ,  G06V30/414 ,  H04N19/132

Abstract: A method, system, and non-transitory computer readable medium for encoding a privacy masked image into an encoded image frame of a video stream is disclosed. The encoding comprises receiving pixel divided image data of an image; receiving data defining an area and graphical characteristic of a privacy mask that masks part of the image; extending the privacy mask to be aligned with one or more encoding units having one or more pixels located within the privacy mask to form a redefined privacy mask; generating a privacy masked image by applying the redefined privacy mask and the graphical characteristic of the privacy mask to the image; and encoding the privacy masked image into the encoded image frame of the video stream, wherein the encoding comprises preventing spatial prediction encoding and/or temporal prediction encoding of pixels within the redefined privacy mask of the image in response to certain conditions.

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.

公开(公告)号：US11539909B2

公开(公告)日：2022-12-27

申请号：US17301102

申请日：2021-03-25

Applicant: Axis AB

Inventor： Axel Keskikangas ,  Song Yuan ,  John Rehn

IPC: H04N5/45 ,  H04N19/159 ,  H04N19/16 ,  H04N19/177 ,  H04N5/232 ,  H04N5/262 ,  H04N5/272 ,  H04N7/01

Abstract: Methods and apparatus, including computer program products, for controlling a Pan-Tilt-Zoom (PTZ) camera. A video stream is provided by the PTZ camera. The video stream includes a main image and a smaller picture-in-picture overlay. The main image and the overlay show the same view. The overlay has both a higher frame rate and a lower resolution compared to the main image. A movement control instruction is received, by the PTZ camera, in response to an evaluation of at least one of the main image and the overlay.

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

IPC: H04N5/232 ,  G06T7/11

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.

公开(公告)号：US11240510B2

公开(公告)日：2022-02-01

申请号：US16947654

申请日：2020-08-11

Applicant: Axis AB

Inventor： Viktor Edpalm ,  Song Yuan

IPC: H04N7/12 ,  H04N19/136 ,  H04N19/162 ,  H04N19/172 ,  H04N19/593

Abstract: Methods and apparatus, including computer program products, implementing and using techniques for encoding a video sequence comprising a plurality of image frames, by an encoder are described. An image frame is received from a video stream. An input is received, which indicates one or more regions in the received image frame for which a privacy mask should be applied. The one or more regions are represented by one or more coding units. The image frame is encoded into an output frame, wherein image data in the one or more regions is replaced by intra-predicted coding units with transformed coefficients set to zero, the intra-predicted coding units are obtained from a prediction stage in the encoder.

公开(公告)号：US11076156B2

公开(公告)日：2021-07-27

申请号：US16947648

申请日：2020-08-11

Applicant: Axis AB

Inventor： Viktor Edpalm ,  Song Yuan

IPC: H04N19/132 ,  H04N19/176 ,  H04N19/46 ,  G06K9/00 ,  G06T5/00 ,  H04N7/18

Abstract: Methods and apparatus, including computer program products, implementing and using techniques providing privacy masks on a video stream. In a video received from a monitoring camera, at least one image region is selected, to which region a privacy mask should be applied. For any image frame in the video that contains the at least one image region, a flag is set to indicate a non-displayed image frame. A forward-predicted image frame referencing the non-displayed image frame is inserted, wherein coding units representing the at least one image region in the forward-predicted image frame collectively provide the privacy mask by obfuscating the at least one image region.

公开(公告)号：US20210185355A1

公开(公告)日：2021-06-17

申请号：US17175423

申请日：2021-02-12

Applicant: Axis AB

Inventor： Viktor Edpalm ,  Song Yuan

IPC: H04N19/593 ,  H04N19/172 ,  H04N19/159 ,  H04N19/17 ,  H04N19/61 ,  H04N19/167 ,  H04N19/105

Abstract: A method, system, and non-transitory computer readable medium for encoding a privacy masked image into an encoded image frame of a video stream is disclosed. The encoding comprises receiving pixel divided image data of an image; receiving data defining an area and graphical characteristic of a privacy mask that masks part of the image; extending the privacy mask to be aligned with one or more encoding units having one or more pixels located within the privacy mask to form a redefined privacy mask; generating a privacy masked image by applying the redefined privacy mask and the graphical characteristic of the privacy mask to the image; and encoding the privacy masked image into the encoded image frame of the video stream, wherein the encoding comprises preventing spatial prediction encoding and/or temporal prediction encoding of pixels within the redefined privacy mask of the image in response to certain conditions.