公开(公告)号：US11223834B2

公开(公告)日：2022-01-11

申请号：US17069921

申请日：2020-10-14

申请人： Axis AB

发明人： Xing Danielsson Fan ,  Maya Shah ,  Mattias Pettersson ,  Adam Schill Collberg ,  Fredrik Pihl ,  Magnus Söderdahl ,  Peter Wilhelmsson

IPC分类号： H04N7/12 ,  H04N19/176 ,  H04N19/172 ,  H04N19/593 ,  H04N19/61

摘要： Video encoding, and specifically to a method and an encoder which can adapt the probability of intra refresh of image frame subdivisions based on a count of image frames since a previous refresh and modulated through convex or concave shaped distribution functions are set forth herein.

公开(公告)号：US09866831B2

公开(公告)日：2018-01-09

申请号：US14939590

申请日：2015-11-12

申请人： Axis AB

发明人： Xing Danielsson Fan ,  Viktor Edpalm ,  Fredrik Pihl ,  Lars Persson ,  Alexandre Martins

IPC分类号： H04N7/12 ,  H04N11/02 ,  H04N11/04 ,  H04N19/105 ,  H04N19/172 ,  H04N19/114 ,  H04N19/137 ,  H04N19/107 ,  H04N19/177 ,  H04N19/179 ,  H04N19/182 ,  H04N19/186 ,  H04N19/503 ,  H04N19/593 ,  H04N19/142 ,  H04N19/87

CPC分类号： H04N19/105 ,  H04N19/107 ,  H04N19/114 ,  H04N19/137 ,  H04N19/142 ,  H04N19/172 ,  H04N19/177 ,  H04N19/179 ,  H04N19/182 ,  H04N19/186 ,  H04N19/503 ,  H04N19/593 ,  H04N19/87

摘要： A method for encoding video is disclosed. The method comprises the steps of receiving information representative of pixels in a current digital image frame of a video to be encoded, calculating a group value for each group of neighboring pixels based on the received information, accumulating group values of corresponding groups of pixels in a first sequence of frames to form a first accumulation of accumulated group values, accumulating group values of corresponding groups of pixels in a second sequence of frames to form a second accumulation of accumulated group values, wherein the second sequence includes frames captured over a longer period of time than the first sequence, comparing accumulated group values of the first accumulation with accumulated group values of the second accumulation, calculating a global change value based on the comparison, setting a GOP length based on the global change value; and encoding the current image frame as an intra-frame or inter-frame based on the GOP length. An encoder system for encoding video is also disclosed.

公开(公告)号：US20170223369A1

公开(公告)日：2017-08-03

申请号：US15412603

申请日：2017-01-23

申请人： Axis AB

发明人： Fredrik Pihl ,  Mats Lund

IPC分类号： H04N19/436 ,  H04N19/105 ,  H04N19/159

CPC分类号： H04N19/436 ,  H04N19/105 ,  H04N19/107 ,  H04N19/154 ,  H04N19/159 ,  H04N19/172 ,  H04N19/176 ,  H04N19/194 ,  H04N19/86

摘要： A method of encoding digital video data corresponding to a sequence of input video frames is disclosed. The input video frames are encoded into a sequence of output video frames. The method comprises encoding a first input video frame in a first encoder instance using intra-frame encoding to produce a first intra-frame, decoding the first intra-frame to produce a first decoded frame, encoding the first decoded frame in a second encoder instance to produce a first output video frame. A digital video encoding system is also disclosed, as well as a camera comprising such a system, and a computer program product for performing the method.

公开(公告)号：US11716475B2

公开(公告)日：2023-08-01

申请号：US17499887

申请日：2021-10-13

申请人： Axis AB

发明人： Fredrik Pihl ,  Mattias Pettersson

IPC分类号： H04N19/132 ,  H04N19/146 ,  H04N19/172 ,  H04N19/59

CPC分类号： H04N19/132 ,  H04N19/146 ,  H04N19/172 ,  H04N19/59

摘要： An image processing device 300, a non-transitory computer readable storage medium, a monitoring camera 200 and a method 100 of pre-processing images of a video stream before encoding the video stream are disclosed. The images are obtained S110, wherein the obtained images have a first resolution. The obtained images are subsampled S120 to intermediate images having a second resolution lower than the first resolution and lower than a third resolution. The intermediate images are upsampled S130 to output images having the third resolution, wherein the third resolution is the same for all images of the video stream.

公开(公告)号：US11477459B2

公开(公告)日：2022-10-18

申请号：US17488349

申请日：2021-09-29

申请人： Axis AB

发明人： Fredrik Pihl ,  Mats Lund

IPC分类号： H04N19/146 ,  H04N19/103 ,  H04N19/172 ,  H04N19/176 ,  H04N7/18

摘要： An image processing device, a camera and a method of encoding a sequence of video images into a single video stream with dynamic bitrate are provided. The sequence of video images is encoded into frames of a base layer of the single video stream using a base layer resolution and a base layer compression level. Video images of the sequence of video images corresponding to respective times before detecting an event trigger are encoded into a first set of frames of an extended layer of the single video stream. The event trigger is detected and upon detecting the event trigger, video images of the sequence of video images corresponding to respective times after detecting the event trigger are encoded into a second set of frames of the extended layer using a higher resolution than the base layer resolution or a lower compression level than the base layer compression level.

公开(公告)号：US20180192057A1

公开(公告)日：2018-07-05

申请号：US15395790

申请日：2016-12-30

申请人： Axis AB

发明人： Bjorn Ardo ,  Fredrik Pihl

IPC分类号： H04N19/146 ,  H04N19/132 ,  H04N19/159 ,  H04N19/46 ,  G06F3/01

CPC分类号： H04N19/146 ,  G06F3/013 ,  H04N19/114 ,  H04N19/132 ,  H04N19/159 ,  H04N19/162 ,  H04N19/167 ,  H04N19/17 ,  H04N19/177 ,  H04N19/182 ,  H04N19/184 ,  H04N19/46

摘要： A method decodes video data based on gaze sensing. The method may decode an encoded video stream received from an encoder associated with a camera, and present the decoded video stream on a display of a device. The method may further detect a gaze point of an operator viewing the display, designate locations associated with the decoded video stream, based upon the gaze point, as skip block insertion points. The method may send the locations to the encoder, wherein the encoder reduces an update rate of inter-frame coded blocks corresponding to the skip block insertion points when encoding video data produced by the camera. An apparatus can implement the method to decode video data based on gaze sensing.

公开(公告)号：US20180190090A1

公开(公告)日：2018-07-05

申请号：US15395403

申请日：2016-12-30

申请人： Axis AB

发明人： Bjorn Ardo ,  Fredrik Pihl

IPC分类号： G08B13/196 ,  G06F3/01

CPC分类号： G08B13/19691 ,  G06F3/013 ,  G08B13/19669 ,  G08B13/19682

摘要： A method and system for monitoring video data based on gaze is disclosed. The method may include receiving a video stream generated by a camera and presenting the received video stream on a display. The method may further include receiving a notification signal triggered by an event and determining that the video stream is associated with the notification signal. The method may further include detecting a gaze point of an operator viewing the display and determining at least one parameter associated with the gaze point. The method may include controlling a state of an alarm associated with the notification signal based upon the at least one parameter associated with the gaze point.

公开(公告)号：US11297321B2

公开(公告)日：2022-04-05

申请号：US16708436

申请日：2019-12-10

申请人： Axis AB

发明人： Fredrik Pihl ,  Viktor Edpalm

IPC分类号： H04N19/13 ,  H04N19/124 ,  H04N19/176 ,  H04N19/196

摘要： A method of encoding a video sequence by an encoder supporting context-based adaptive binary arithmetic coding, CABAC is disclosed. The method comprises determining, by a rate controller, a compression parameter of the encoder based on a load parameter value, indicating a current actual load of the coding block, received from the coding block.

公开(公告)号：US10834394B2

公开(公告)日：2020-11-10

申请号：US16224104

申请日：2018-12-18

申请人： Axis AB

发明人： Alexander Toresson ,  Viktor Edpalm ,  Fredrik Pihl

IPC分类号： H04N19/86 ,  H04N19/567 ,  H04N19/117 ,  H04N19/146 ,  H04N19/46 ,  H04N19/136 ,  H04N19/172 ,  H04N19/82 ,  H04N19/139 ,  H04N19/177 ,  H04N19/196

摘要： A method of adding comfort noise to a video sequence comprising setting parameters of a deblocking filter of a video encoder to change values during the video sequence, encoding frames of the video sequence using the parameters of the deblocking filter that are set to change values during the video sequence, thereby introducing comfort noise in the video sequence, and including the encoded frames in a bitstream together with an indication of which parameters of the deblocking filter were used when encoding the frames of the video sequence.

公开(公告)号：US10382780B2

公开(公告)日：2019-08-13

申请号：US15928798

申请日：2018-03-22

申请人： Axis AB

发明人： Anton Öhrn ,  Viktor Edpalm ,  Henrik Eliasson ,  Björn Benderius ,  Niclas Svensson ,  Xing Danielsson Fan ,  Fredrik Pihl

IPC分类号： H04N19/117 ,  H04N19/137 ,  H04N19/107 ,  H04N19/55 ,  H04N19/593 ,  H04N19/182 ,  H04N19/503 ,  H04N19/159 ,  H04N19/176

摘要： A method of encoding a video stream comprising receiving a frame of a video stream to be encoded, performing motion detection in the frame to identify steady regions, and temporally filtering the frame so as to provide temporally filtered pixel values. For a pixel in the steady regions of the frame, the temporally filtered pixel value is used when encoding the pixel, on a condition that the pixel belongs to a block of pixels of the frame that will be intra-coded. On a condition that the pixel instead belongs to a block of pixels of the frame that will be inter-coded, a value that was used when encoding a corresponding pixel of the immediately preceding frame is used when encoding the pixel.