Method for controlling handheld gimbal, and handheld gimbal

Patent metadata

Field	Value
Publication number	US-2021263394-A1
Application number	US-202117317879-A
Country	US
Kind code	A1
Filing date	May 11, 2021
Priority date	Nov 15, 2018
Publication date	Aug 26, 2021
Grant date	—

Abstract

The present disclosure provides a method for controlling a handheld gimbal and a handheld gimbal. The method for controlling a handheld gimbal includes: upon rotation of a handheld gimbal, obtaining current attitude information of a photographing device and current attitude information of a handle; according to the current attitude information of the photographing device and the current attitude information of the handle, obtaining target attitude information of the photographing device; according to the current attitude information of the photographing device and the target attitude information, controlling a shaft joint of the handheld gimbal to rotate so that the attitude of the photographing device follows the attitude of the handle.

First claim

What is claimed is:

1 . A method for controlling a handheld gimbal, comprising:
upon rotation of a handheld gimbal, obtaining current attitude information of a photographing device and current attitude information of a handle; obtaining target attitude information of the photographing device according to the current attitude information of the photographing device and the current attitude information of the handle; and according to the current attitude information of the photographing device and the target attitude information, controlling a shaft joint of the handheld gimbal to rotate so that the attitude of the photographing device follows the attitude of the handle.

2 . The method according to claim 1 , wherein obtaining the current attitude information of the handle comprises:
obtaining historical attitude information of the photographing device before the rotation of the handheld gimbal, and a rotation angle corresponding to a shaft joint on the handheld gimbal in a body coordinate system of the photographing device; and obtaining the current attitude information of the handle according to the historical attitude information and the rotation angle.

3 . The method according to claim 2 , wherein obtaining the current attitude information of the handle according to the historical attitude information and the rotation angle comprises:
determining a quaternion corresponding to the shaft joint according to the rotation angle corresponding to the shaft joint; and according to a quaternion corresponding to the historical attitude information of the photographing device and the quaternion corresponding to the shaft joint, obtaining the current attitude information of the handle.

4 . The method according to claim 2 , wherein the shaft joint includes at least one of: a pitch axis shaft joint, a roll axis shaft joint, or a yaw axis shaft joint.

5 . The method according to claim 1 , wherein obtaining the target attitude information of the photographing device according to the current attitude information of the photographing device and the current attitude information of the handle, includes:
obtaining a follow-up time, the follow-up time being a time interval from an end of the rotation of the handheld gimbal until the attitude of the photographing device follows the attitude of the handle; and according to the current attitude information of the photographing device, the current attitude information of the handle, and the follow-up time, obtaining the target attitude information of the photographing device by using an interpolation algorithm.

6 . The method according to claim 5 , further comprising: adjusting the attitude of the photographing device in real time at a preset frequency to follow the attitude of the handle.

7 . The method according to claim 5 , wherein the interpolation algorithm is a spherical linear interpolation algorithm.

8 . The method according to claim 1 , further comprising:
obtaining a directional cosine matrix according to the target attitude information; obtaining an attitude corresponding to a pitch axis in the body coordinate system of the photographing device according to the directional cosine matrix; and according to the target attitude information and the attitude corresponding to the pitch axis, controlling a shaft joint of the handheld gimbal to rotate so that an optical axis of the photographing device is parallel or coincides with an axis of the handle.

9 . The method according to claim 8 , wherein obtaining the attitude corresponding to the pitch axis in the body coordinate system of the photographing device according to the directional cosine matrix includes:
obtaining axis vectors of the pitch axis in a geodetic coordinate system according to the directional cosine matrix and axis vectors of the pitch axis in the body coordinate system; obtaining a rotation angle of the pitch axis; and according to the axis vectors of the pitch axis in the geodetic coordinate system and the rotation angle of the pitch axis, obtaining the attitude corresponding to the pitch axis.

10 . The method according to claim 8 , further comprising:
obtaining an attitude corresponding to a yaw axis in the body coordinate system of the photographing device according to the directional cosine matrix; and according to the target attitude information, the attitude corresponding to the pitch axis, and the attitude corresponding to the yaw axis, controlling the shaft joints of the handheld gimbal to rotate, to roll and rotate the photographing device around its optical axis.

11 . The method according to claim 10 , wherein obtaining the attitude corresponding to the yaw axis in the body coordinate system of the photographing device according to the directional cosine matrix includes:
obtaining axis vectors of the yaw axis in the geodetic coordinate system according to the directional cosine matrix and axis vectors of the yaw axis in the body coordinate system; obtaining a rotation angle of the yaw axis; and according to the axis vectors of the yaw axis in the geodetic coordinate system and the rotation angle of the yaw axis, obtaining the attitude corresponding to the yaw axis.

12 . The method according to claim 11 , wherein obtaining the rotation angle of the yaw axis includes:
obtaining an angular velocity input when a user operates a joystick on the handle; and obtaining the rotation angle of the yaw axis by performing integration by using the angular velocity.

13 . The method according to claim 1 , wherein the target attitude information is intermediate attitude information in a process that the attitude of the photographing device follows the attitude of the handle, or the current attitude information of the handle.

14 . A handheld gimbal, comprising: a handle, a gimbal, and a photographing device, wherein:
the gimbal includes a gimbal base and a plurality of shaft joints, each of the plurality of shaft joints includes a motor and a shaft arm connected to and driven by the motor; the handle is connected to the gimbal base; and the photographing device is disposed on the gimbal; the gimbal also includes a memory and a processor; the memory is configured to store instructions; the processor is configured to execute the instructions to implement:
upon rotation of the handheld gimbal, obtaining current attitude information of the photographing device and current attitude information of the handle;
obtaining target attitude information of the photographing device according to the current attitude information of the photographing device and the current attitude information of the handle; and
according to the current attitude information of the photographing device and the target attitude information, controlling a shaft joint of the handheld gimbal to rotate so that the attitude of the photographing device follows the attitude of the handle.

15 . The handheld gimbal according to claim 14 , wherein the processor is specifically configured to:
obtain historical attitude information of the photographing device before the rotation of the handheld gimbal, and a rotation angle corresponding to a shaft joint on the handheld gimbal in a body coordinate system of the photographing device; and obtain the current attitude information of the handle according to the historical attitude information and the rotation angle.

16 . The handheld gimbal according to claim 15 , wherein the processor is specifically configured to:
determine a quaternion corresponding to the shaft joint according to the rotation angle corresponding to the shaft joint;

Assignees

• Sz Dji Technology Co Ltd

Inventors

• Su Tie
• Hao Yi

Classifications

• G05B2219/40582

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• G05B19/423

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