公开(公告)号：US20200154129A1

公开(公告)日：2020-05-14

申请号：US16738253

申请日：2020-01-09

Applicant: SZ DJI TECHNOLOGY CO., LTD.

Inventor： Wenyi SU ,  Liang ZHAO ,  Lei ZHU

IPC: H04N19/513 ,  H04N19/527 ,  H04N19/172 ,  H04N19/423 ,  H04N19/53

Abstract: Motion estimation method and motion estimation device are provided. The method includes: determining a global motion vector of a current frame relative to a current reference frame according to the current frame and the current reference frame; and performing motion estimation on a target frame according to the global motion vector.

公开(公告)号：US20190342551A1

公开(公告)日：2019-11-07

申请号：US16511839

申请日：2019-07-15

Applicant: SZ DJI TECHNOLOGY CO., LTD.

Inventor： Lei ZHU

IPC: H04N19/124 ,  H04N19/149

Abstract: A method for rate control includes encoding a first input frame using a first plurality of coding parameter values to generate a first plurality of encoded data streams, each of the first plurality of encoded data streams being generated using a corresponding coding parameter value of the first plurality of coding parameter values and each of the first plurality of encoded data streams having a corresponding bitrate of a first plurality of bitrate values, updating a rate control model representing a correspondence between coding parameter and bitrate based on the first plurality of coding parameter values and the first plurality of bitrate values respectively corresponding to the first plurality of encoded data streams, and encoding a second input frame based on the updated rate control model.

公开(公告)号：US20180091828A1

公开(公告)日：2018-03-29

申请号：US15824581

申请日：2017-11-28

Applicant: SZ DJI TECHNOLOGY CO., LTD.

Inventor： Xing CHEN ,  Zisheng CAO ,  Lei ZHU

IPC: H04N19/91 ,  H04N19/13 ,  H04N19/105

CPC classification number: H04N19/91 ,  H04N19/105 ,  H04N19/13 ,  H04N19/503

Abstract: A system for processing a video obtains a prediction table for a reference frame of the video and codes one or more target frames of the video based on the prediction table. The prediction table is a Huffman table of difference values for reference pixels of the reference frame. The difference value for a reference pixel is determined based on an actual value of the reference pixel and a prediction value determined based on respective pixel values of one or more pixels adjacent to the reference pixel. The one or more target frames are coded based on the Huffman table of the reference frame and prediction values of the one or more target frames.

公开(公告)号：US20220086454A1

公开(公告)日：2022-03-17

申请号：US17456791

申请日：2021-11-29

Applicant: SZ DJI TECHNOLOGY CO., LTD.

Inventor： Liang ZHAO ,  Wenyi SU ,  Lei ZHU

IPC: H04N19/149 ,  H04N19/115 ,  H04N19/126 ,  H04N19/17

Abstract: A method for supporting video coding includes obtaining an image frame including a plurality of coding block groups each including one or more coding blocks, using a first coding control model associated with a first coding block group in the image frame to estimate one or more first coding parameters, using a second coding control model associated with a second coding block group in the image frame to estimate one or more second coding parameters, determining an effective coding parameter based on an evaluation of the one or more first coding parameters and the one or more second coding parameters, and using the effective coding parameter to encode the plurality of coding block groups in the image frame. The second coding control model is different from the first coding control model. The second coding block group is different from the first coding block group.

公开(公告)号：US20200275105A1

公开(公告)日：2020-08-27

申请号：US15931260

申请日：2020-05-13

Applicant: SZ DJI TECHNOLOGY CO., LTD.

Inventor： Liang ZHAO ,  Wenyi SU ,  Lei ZHU

IPC: H04N19/149 ,  H04N19/17 ,  H04N19/115 ,  H04N19/126

Abstract: A method for supporting video coding includes obtaining an image frame including a plurality of coding block groups each including one or more coding blocks, using a first coding control model associated with a first coding block group in the image frame to estimate one or more first coding parameters, using a second coding control model associated with a second coding block group in the image frame to estimate one or more second coding parameters, determining one or more effective coding parameters based on an evaluation of the one or more first coding parameters and the one or more second coding parameters, and using the one or more effective coding parameters to encode the plurality of coding block groups in the image frame.

公开(公告)号：US20200264011A1

公开(公告)日：2020-08-20

申请号：US16854559

申请日：2020-04-21

Applicant: SZ DJI TECHNOLOGY CO., LTD.

Inventor： Qingbo LU ,  Chen LI ,  Lei ZHU ,  Xiaodong WANG

IPC: G01C25/00 ,  G06T7/246 ,  G06K9/46 ,  B64C39/02 ,  B64D47/08 ,  G01C21/16

Abstract: Method and device for drift calibration of an inertial measurement unit, and an unmanned aerial vehicle are provided. The drift calibration method includes obtaining video data captured by a photographing device; and determining a measurement error of the inertial measurement unit according to the video data and rotation information of the inertial measurement unit when the photographing device capturing the video data. The rotation information of the inertial measurement unit includes the measurement error of the inertial measurement unit.

公开(公告)号：US20200250429A1

公开(公告)日：2020-08-06

申请号：US16855826

申请日：2020-04-22

Applicant: SZ DJI TECHNOLOGY CO., LTD.

Inventor： Qingbo LU ,  Chen LI ,  Lei ZHU ,  Xiaodong WANG

IPC: G06K9/00 ,  B64C39/02 ,  B64D47/08 ,  G06K9/46 ,  G06K9/62 ,  H04N5/225 ,  G01P3/44 ,  G01C9/02 ,  G01C25/00

Abstract: A method of attitude calibration includes acquiring video data by a photographing device, obtaining rotation information of an initial measurement unit (IMU) in a time interval during which the video data is acquired, and determining a relative attitude between the photographing device and the IMU based the video data and the rotation information.

公开(公告)号：US20200236276A1

公开(公告)日：2020-07-23

申请号：US16838598

申请日：2020-04-02

Applicant: SZ DJI TECHNOLOGY CO., LTD.

Inventor： Jun WU ,  Lei ZHU

IPC: H04N5/232 ,  H04N7/01 ,  H04N5/225

Abstract: A method for wirelessly transmitting video data from a photographing apparatus to a display apparatus includes: setting an acquisition resolution for the photographing apparatus to match a display resolution of the display apparatus; acquiring images by the photographing apparatus with the acquisition resolution and an acquisition frame rate; performing frame dropping processing on the images to obtain target video image frames; encoding the target video image frames to obtain encoded target video image frames having an encoded output frame rate, the encoded output frame rate being equal to a display frame rate of the display apparatus and lower than the acquisition frame rate of the photographing apparatus; and transmitting the encoded target video image frames to the display apparatus.

公开(公告)号：US20200177913A1

公开(公告)日：2020-06-04

申请号：US16727428

申请日：2019-12-26

Applicant: SZ DJI TECHNOLOGY CO., LTD.

Inventor： Lei ZHU

IPC: H04N19/59 ,  H04N19/132 ,  H04N19/172 ,  B64C39/02

Abstract: A method for processing video data is provided. The method includes down-sampling temporally an image sequence to form a plurality of subsequences; encoding the plurality of subsequences separately to form a plurality of encoded subsequences; and selecting frames for transmission according to a size of each frame in the plurality of encoded subsequences and a channel bandwidth. An unmanned aerial vehicle and a non-transitory computer-readable storage medium are also provided.

公开(公告)号：US20200036944A1

公开(公告)日：2020-01-30

申请号：US16589119

申请日：2019-09-30

Applicant: SZ DJI TECHNOLOGY CO., LTD.

Inventor： Lei ZHU ,  Hao CUI ,  Ming GONG

IPC: H04N7/18 ,  H04N19/436 ,  H04N7/08

Abstract: A method for transmitting video from a movable object includes decomposing video data into a plurality of sub-video data units, encoding the plurality of sub-video data units individually to generate a plurality of coded sub-video data units, and selecting at least one of the plurality of coded sub-video data units for transmission according to one or more characteristics the sub-video data units and one or more channel conditions of a plurality of channels.