公开(公告)号：US20200169727A1

公开(公告)日：2020-05-28

申请号：US16678131

申请日：2019-11-08

Applicant: Axis AB

Inventor： Viktor Edpalm ,  Maya Shah

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

Abstract: Video encoding uses periodic intra refresh, which can adapt padding of an intra encoding region between image frames based on motion in the image frame.

公开(公告)号：US10574996B2

公开(公告)日：2020-02-25

申请号：US15960176

申请日：2018-04-23

Applicant: AXIS AB

Inventor： Viktor Edpalm ,  Alexander Toresson ,  Alexandre Martins

IPC: H04N19/146 ,  H04N19/114 ,  H04N19/124 ,  H04N19/40 ,  H04N19/61 ,  H04N19/179 ,  H04N19/169

Abstract: A method of controlling output bitrate of a video encoder encoding a video sequence. The method comprises setting a long-term bit budget for a time period of at least one day for output of the video encoder, and determining a first allowable bitrate based on the long-term bit budget. The method further comprises determining an instantaneous bit restriction for output of the video encoder, and determining a second allowable bitrate based on the instantaneous bit restriction. Output bitrate is controlled based on the first allowable bitrate and the second allowable bitrate, such that the long-term bit budget, the first allowable bitrate and the second allowable bitrate are complied with. The method may be performed in a non-transitory computer-readable medium having instruction stored thereon. The method may also be performed by a bitrate controller. The bitrate controller may be found in a camera and a network video recorder.

公开(公告)号：US20190306525A1

公开(公告)日：2019-10-03

申请号：US16361475

申请日：2019-03-22

Applicant: Axis AB

Inventor： Viktor Edpalm ,  Björn Ardö

IPC: H04N19/513 ,  H04N19/105 ,  H04N19/11 ,  H04N19/184

Abstract: The present teachings relate to the field of video encoding. In particular, the present teachings relate to a method, device, and system for encoding a sequence of frames wherein a motion level of image data of an initial frame in the sequence of frames is determined to be below a motion level threshold. The encoding method described herein may reduce the bit rate for the encoded sequence of frames, while avoiding that the encoded video stream looks unnatural or frozen when decoded and displayed.

公开(公告)号：US10334267B2

公开(公告)日：2019-06-25

申请号：US15894438

申请日：2018-02-12

Applicant: Axis AB

Inventor： Viktor Edpalm

IPC: H04B1/66 ,  H04N7/12 ,  H04N11/02 ,  H04N11/04 ,  H04N19/51 ,  H04N19/593 ,  H04N19/176 ,  H04N19/182 ,  H04N19/107 ,  H04N19/109 ,  H04N19/14 ,  H04N19/567

Abstract: 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.

公开(公告)号：US20190116371A1

公开(公告)日：2019-04-18

申请号：US16163387

申请日：2018-10-17

Applicant: Axis AB

Inventor： Viktor Edpalm ,  Hampus Linse

IPC: H04N19/31 ,  H04N19/513 ,  H04N19/167 ,  H04N19/70

Abstract: A method and an encoder for encoding a video stream in a video coding format supporting auxiliary frames, where such auxiliary frames, in conjunction with the frames that reference the auxiliary frames, can be used to for rate control, in that the image data of the auxiliary frames comprises a down scaled version of an image data captured by a video capturing device, and that motion vectors of the frame referring to the auxiliary frame are calculated/determined to scale up the down scaled version of the image data to again have the intended resolution.

公开(公告)号：US10142528B2

公开(公告)日：2018-11-27

申请号：US15824160

申请日：2017-11-28

Applicant: Axis AB

Inventor： Viktor Edpalm

IPC: H04N5/225 ,  H04N19/107 ,  H04N5/232 ,  H04N5/235 ,  H04N19/159 ,  H04N19/114 ,  H04N19/149 ,  H04N5/238

Abstract: There is provided a method for controlling an infrared cut, IR-cut, filter of a video camera. An indication to switch state of the IR-cut filter of the video camera is received, and a switch of state of the IR-cut filter is synchronized with a video encoding of frames captured by the video camera, such that the IR-cut filter is controlled to switch state when the video camera is about to capture a frame which is a predetermined number of frames before a frame which is scheduled to be encoded as an intra-frame.

公开(公告)号：US20180309986A1

公开(公告)日：2018-10-25

申请号：US15960091

申请日：2018-04-23

Applicant: AXIS AB

Inventor： Viktor Edpalm

IPC: H04N19/115 ,  H04N19/164 ,  H04N19/184 ,  H04N19/139 ,  H04N19/52 ,  H04N5/232

CPC classification number: H04N19/115 ,  H04N5/23229 ,  H04N7/18 ,  H04N19/139 ,  H04N19/14 ,  H04N19/164 ,  H04N19/179 ,  H04N19/184 ,  H04N19/52

Abstract: A controller and a method for controlling output bitrate of a video encoder when encoding a video stream. The method for controlling output bitrate of a video encoder when encoding a video stream comprises: receiving weather forecast data for a location where the video stream is captured; predicting, based on the weather forecast data, a future increase in output bitrate of the video encoder due to weather affecting contents of the video stream; and reducing the output bitrate of the video encoder by increasing a compression level of the video stream so as to compensate for the future increase in output bitrate of the video encoder.

公开(公告)号：US10110929B2

公开(公告)日：2018-10-23

申请号：US15246951

申请日：2016-08-25

Applicant: AXIS AB

Inventor： Alexandre Martins ,  Viktor Edpalm ,  Xing Danielsson Fang ,  Lars Persson ,  Fredrik Pihl

IPC: H04N5/232 ,  H04N19/85 ,  G06T5/00 ,  H04N19/172 ,  H04N19/134 ,  H04N19/107 ,  H04N19/117 ,  H04N19/162 ,  H04N19/426 ,  H04N5/225

Abstract: A method of pre-processing digital images captured by an image sensor for encoding is disclosed. The method comprises receiving a first digital image, receiving information representative of a movement of the image sensor at a time of capture of said first digital image), and pre-processing said first digital image. At least one parameter of said pre-processing is dependent on said information representative of movement. A digital image pre-processing system is also disclosed.

公开(公告)号：US20180278849A1

公开(公告)日：2018-09-27

申请号：US15928722

申请日：2018-03-22

Applicant: Axis AB

Inventor： Fredrik Pihl ,  Xing Danielsson Fan ,  Björn Benderius ,  Viktor Edpalm ,  Niclas Svensson ,  Henrik Eliasson

IPC: H04N5/232 ,  H04N19/139 ,  H04N19/105 ,  H04N19/154 ,  H04N19/177

CPC classification number: H04N5/23267 ,  H04N5/23229 ,  H04N5/23232 ,  H04N5/23254 ,  H04N5/243 ,  H04N19/105 ,  H04N19/139 ,  H04N19/154 ,  H04N19/177

Abstract: A method for controlling a video camera which is configured to capture and process image frames prior to encoding. The method comprises determining whether the video camera is going to encode an image frame as an intra-frame or an inter-frame. If the image frame is going to be encoded as an inter-frame, the video camera is controlled to capture and process the image frame using first settings prior to encoding. If the image frame is going to be encoded as an intra-frame, the video camera is controlled to capture and process the image frame using second settings prior to encoding, wherein the second settings are modified in relation to the first settings to further reduce a level of noise in the image frame.

公开(公告)号：US20180270482A1

公开(公告)日：2018-09-20

申请号：US15921302

申请日：2018-03-14

Applicant: Axis AB

Inventor： Viktor Edpalm ,  Xing Danielsson Fan

IPC: H04N19/124 ,  H04N19/196 ,  H04N19/177 ,  H04N19/573 ,  H04N19/159 ,  H04N19/147

Abstract: A method of determining a maximum permissible key frame distance for use in encoding image frames in a video sequence comprising encoding a plurality of video test sequences, each video test sequence having a respective noise level, where each video test sequence is encoded using a respective quantization parameter and a plurality of key frame distances is disclosed. For each video test sequence, an output bitrate is determined for each key frame distance. For each combination of noise level, quantization parameter, and key frame distance, the determined output bitrate is stored and a maximum key frame distance at which output bitrate decreases in response to an increase in key frame distance is identified as maximum permissible key frame distance. A method of encoding image frames in a video sequence is also disclosed, as well as a system, a camera and a computer program product for performing the methods.