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86 条记录 (耗时 0.021 秒)

    Encoding of modified video
    2.
    发明授权
    Encoding of modified video 有权

    公开(公告)号：US12010320B2

    公开(公告)日：2024-06-11

    申请号：US17552616

    申请日：2021-12-16

    申请人： Axis AB

    发明人： Song Yuan ,  Viktor Edpalm ,  Lars Branzén

    IPC分类号： H04N19/136 ,  H04L9/08 ,  H04L9/32 ,  H04N19/172

    CPC分类号： H04N19/136 ,  H04L9/0825 ,  H04L9/3236 ,  H04L9/3247 ,  H04N19/172

    摘要： A method of processing a video stream comprises receiving a first/second set of input image frames comprising image data originating from a first/second source of input image frames; encoding the sets of input image frames into first/second sets of encoded image frames, forming a combined video stream, wherein an encoded image frame of the first set of encoded image frames exclusively references one or more other encoded image frames of the first set of encoded image frames, and an encoded image frame of the second set of encoded image frames references both an encoded image frame of the first set of encoded image frames and another encoded image frame of the second set of encoded image frames; and signing, using a first/second key, a first/second signing group comprising one or more encoded image frames of the first/second set of encoded image frames, wherein each key pertains to the respective source.

    Method for intra refresh encoding of a plurality of image frames
    3.
    发明授权
    Method for intra refresh encoding of a plurality of image frames 有权

    公开(公告)号：US11025906B2

    公开(公告)日：2021-06-01

    申请号：US16678131

    申请日：2019-11-08

    申请人： Axis AB

    发明人： Viktor Edpalm ,  Maya Shah

    IPC分类号： H04N19/105 ,  H04N19/139 ,  H04N19/172 ,  H04N19/513

    摘要： Video encoding is provided using periodic intra refresh, which can adapt padding of an intra encoding region between image frames based on a current level motion in the image frame. Upon a current level of motion not exceeding a first threshold, an intra encoding region of the image frame according to a predefined periodic intra refresh pattern is intra encoded. Upon the current level of motion exceeding the first threshold, the intra encoding region of the image frame is expanded to overlap to a determined extent with a previously encoded intra encoding region among the plurality of image frames, and the expanded intra encoding region of the image frame is intra encoded. Regions of the image different from the intra encoding regions and the expanded intra encoded region, respectively are inter frame encoded.

    Method and encoder system for encoding video
    4.
    发明授权
    Method and encoder system for encoding video 有权

    公开(公告)号：US10979711B2

    公开(公告)日：2021-04-13

    申请号：US15816538

    申请日：2017-11-17

    申请人： Axis AB

    发明人： Viktor Edpalm ,  Alexander Toresson

    IPC分类号： H04N19/61 ,  H04N19/149 ,  H04N19/124 ,  H04N19/136 ,  H04N19/18 ,  H04N19/176 ,  H04N19/146 ,  H04N19/137 ,  H04N19/182 ,  H04N19/513

    摘要： A method for encoding video is disclosed wherein information representative of pixels in an image frame is received, and a spatial statistical measure of said information is calculated for groups of neighbouring pixels to form a group value for each group of pixels. A set of available quantization steps is determined comprising a first predetermined quantization step. For a first group of neighbouring pixels, the method comprises: for each available quantization step calculating a remainder after division of the group value of the first group of pixels by the respective available quantization step. The quantization step of the set that results in the smallest remainder is selected as selected quantization step. The first group of pixels is encoded using the selected quantization step. A method of encoding differences between image frames is also disclosed, as well as encoding systems.

    Methods and devices for encoding and decoding a sequence of image frames in which the privacy of an object is protected
    5.
    发明授权
    Methods and devices for encoding and decoding a sequence of image frames in which the privacy of an object is protected 有权

    公开(公告)号：US10964182B2

    公开(公告)日：2021-03-30

    申请号：US16721247

    申请日：2019-12-19

    申请人： Axis AB

    发明人： Song Yuan ,  Viktor Edpalm

    IPC分类号： G08B13/196 ,  G06K9/00

    摘要： A method encodes a sequence of image frames depicting an object whose privacy is to be protected. A first and a second version of the sequence of image frames is generated. Image frames of the first version, but not the second version, of the sequence are provided with a privacy mask to protect the privacy of the object depicted therein. The first version of the sequence is encoded as a first encoded sequence of intra-coded image frames and inter-coded image frames. A second version of the sequence is encoded as a second encoded sequence of inter-coded image frames. The inter-coded image frames of the second encoded sequence are encoded by using the intra-coded image frames of the first encoded sequence. The inter-coded image frames of the second encoded sequence are encrypted, and thereafter the first and the second encoded sequence are merged into a single output sequence.

    METHOD FOR IDENTIFYING EVENTS IN A MOTION VIDEO
    6.
    发明申请
    METHOD FOR IDENTIFYING EVENTS IN A MOTION VIDEO 审中-公开

    公开(公告)号：US20180173956A1

    公开(公告)日：2018-06-21

    申请号：US15851028

    申请日：2017-12-21

    申请人： Axis AB

    发明人： Viktor Edpalm ,  Erik Andersson ,  Song Yuan

    IPC分类号： G06K9/00 ,  G06K9/62

    CPC分类号： G06K9/00718 ,  G06K9/00771 ,  G06K9/4628 ,  G06K9/6256 ,  G06K9/6262 ,  G06K9/6271 ,  G06K9/6293 ,  G06K2009/00738 ,  G06N3/0445 ,  G06N3/084 ,  H04N7/183

    摘要： A method for identifying events in a scene captured by a motion video camera comprises two identification processes, a temporary identification process and a long-term identification process. The temporary process includes: analyzing pixel data from captured image frames and identifying events; registering camera processing data relating to each image frame subjected to the identification of events; and adjusting weights belonging to an event identifying operation, wherein the weights are adjusted for achieving high correlation between the result from the event identifying operation and the result from the identification based on analysis of pixels from captured image frames of the captured scene. The long-term identification process includes: identifying events in the captured scene by inputting registered camera processing data to the event identifying operation. The temporary identification process is then executed during a predetermined time period and the long-term identification process is executed after the predetermined initial time has expired.

    METHOD AND ENCODER SYSTEM FOR ENCODING VIDEO
    7.
    发明申请
    METHOD AND ENCODER SYSTEM FOR ENCODING VIDEO 审中-公开

    公开(公告)号：US20180146196A1

    公开(公告)日：2018-05-24

    申请号：US15816538

    申请日：2017-11-17

    申请人： Axis AB

    发明人： Viktor Edpalm ,  Alexander Toresson

    IPC分类号： H04N19/124 ,  H04N19/182

    CPC分类号： H04N19/124 ,  H04N19/136 ,  H04N19/137 ,  H04N19/146 ,  H04N19/176 ,  H04N19/18 ,  H04N19/182 ,  H04N19/513

    摘要： A method for encoding video is disclosed wherein information representative of pixels in an image frame is received, and a spatial statistical measure of said information is calculated for groups of neighbouring pixels to form a group value for each group of pixels. A set of available quantization steps is determined comprising a first predetermined quantization step. For a first group of neighbouring pixels, the method comprises: for each available quantization step calculating a remainder after division of the group value of the first group of pixels by the respective available quantization step. The quantization step of the set that results in the smallest remainder is selected as selected quantization step. The first group of pixels is encoded using the selected quantization step. A method of encoding differences between image frames is also disclosed, as well as encoding systems.