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    METHOD AND IMAGE PROCESSING UNIT FOR FORMING A VIDEO STREAM
    21.
    发明申请
    METHOD AND IMAGE PROCESSING UNIT FOR FORMING A VIDEO STREAM 审中-公开

    公开(公告)号：US20180310022A1

    公开(公告)日：2018-10-25

    申请号：US15961426

    申请日：2018-04-24

    申请人： Axis AB

    发明人： Viktor Edpalm ,  Björn Ardö

    IPC分类号： H04N19/58 ,  H04N19/176

    CPC分类号： H04N19/58 ,  H04N19/105 ,  H04N19/132 ,  H04N19/139 ,  H04N19/172 ,  H04N19/176 ,  H04N19/177 ,  H04N19/527 ,  H04N19/59

    摘要： A method and an apparatus for forming a video stream based on images of a scene captured by a camera. The method comprises: encoding image frames based on images captured by the camera, forming an encoded portion; determining a length of motion for a sample image frame, the length of motion being indicative of the amount of relative motion between the camera and the scene in the sample image frame relative a temporally preceding image frame; setting a motion length threshold based on a motion vector search range of the encoder; comparing the determined length of motion with the set motion length threshold; based on the outcome of the comparison, adjusting a chosen temporal frame distance of at least an adjustment portion (PA) of the video stream, wherein the adjustment portion is comprised in the encoded portion or in a temporally later encoded portion.

    VIDEO ENCODER AND A METHOD IN A VIDEO ENCODER
    23.
    发明申请
    VIDEO ENCODER AND A METHOD IN A VIDEO ENCODER 审中-公开

    公开(公告)号：US20180255315A1

    公开(公告)日：2018-09-06

    申请号：US15894438

    申请日：2018-02-12

    申请人： Axis AB

    发明人： Viktor Edpalm

    IPC分类号： H04N19/51 ,  H04N19/182 ,  H04N19/176 ,  H04N19/593

    CPC分类号： H04N19/51 ,  H04N19/107 ,  H04N19/109 ,  H04N19/14 ,  H04N19/176 ,  H04N19/182 ,  H04N19/567 ,  H04N19/593

    摘要： A video encoder receives a frame to be encoded and divides the current frame into blocks of pixels. For each block, a spatial variability is calculated and a cost function used to evaluate a cost for inter-coding the block of pixels is set to be dependent on the spatial variability. A ratio of a weight associated with a cost of encoding a motion vector and a weight associated with a sum of differences value is set to be lower if the spatial variability of the block of pixels in the current frame is below a first threshold compared to if the spatial variability is equal to or above the first threshold. The block is matched with a plurality of blocks in a reference frame, and a cost for inter-coding the block with reference to each of the plurality of blocks in a reference frame is evaluated according to the cost function.

    VIDEO FAILOVER RECORDING
    26.
    发明公开
    VIDEO FAILOVER RECORDING 审中-公开

    公开(公告)号：US20240196035A1

    公开(公告)日：2024-06-13

    申请号：US18530479

    申请日：2023-12-06

    申请人： Axis AB

    发明人： Viktor Edpalm ,  Jonas Cremon

    IPC分类号： H04N21/2662 ,  H04N21/2365 ,  H04N21/44

    CPC分类号： H04N21/2662 ,  H04N21/23655 ,  H04N21/44004 ,  H04N19/436

    摘要： A method of failover recording of video streams in a camera connectable to a receiver device over a communication network, the method comprising: detecting that a bandwidth of a connection over the communication network is insufficient for transmitting a video stream at a predetermined bitrate, generating multiple parallel encoded video streams with different bitrates, storing the multiple parallel encoded video streams on a memory storage accessible to the camera, detecting that the memory storage usage of the memory storage exceeds a storage threshold, discontinuing the storing of one of the multiple encoded video streams being the encoded video stream that provides the highest bitrate among the multiple encoded video streams, and discarding the one of the multiple encoded video streams from the memory storage.

    Method and device for determining authenticity of a video
    27.
    发明授权
    Method and device for determining authenticity of a video 有权

    公开(公告)号：US11989869B2

    公开(公告)日：2024-05-21

    申请号：US17380127

    申请日：2021-07-20

    申请人： Axis AB

    发明人： Viktor Edpalm ,  Song Yuan

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

    CPC分类号： G06T7/0002 ,  G06T1/0028 ,  G06T7/20 ,  G06T2207/10016 ,  G06T2207/30168 ,  G06T2207/30232

    摘要： 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.

    Exposure time control in a video camera
    29.
    发明授权
    Exposure time control in a video camera 有权

    公开(公告)号：US11653100B2

    公开(公告)日：2023-05-16

    申请号：US17682435

    申请日：2022-02-28

    申请人： Axis AB

    发明人： Viktor Edpalm ,  Andreas Irestål

    IPC分类号： H04N23/73 ,  H04N23/54

    CPC分类号： H04N23/73 ,  H04N23/54

    摘要： An exposure time controller for controlling an exposure time (ET) variable of a video camera, which is associated with an auto-exposure algorithm configured to reduce an exposure mismatch (ΔE) by incrementing and decrementing the ET variable, which comprises: a memory for recording ET values applied while the video camera is imaging a scene and the algorithm is active; and processing circuitry configured to: determine that the exposure mismatch exceeds a threshold while the video camera is imaging the scene; estimate a distribution of the recorded ET values; based on the estimated distribution, identify multiple relatively most frequent ET values; and, in reaction to determining that the exposure mismatch exceeds the threshold, assign one of the identified ET values to the ET variable.

    Encoding a privacy masked image
    30.
    发明授权
    Encoding a privacy masked image 有权

    公开(公告)号：US11601674B2

    公开(公告)日：2023-03-07

    申请号：US17175423

    申请日：2021-02-12

    申请人： Axis AB

    发明人： Viktor Edpalm ,  Song Yuan

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

    摘要： 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.