Automatic surround photographing method and system for target

1. An automatic surround photographing method for a target, comprising the steps of:

obtaining a yaw axis gimbal angle parameter to process an image captured by a camera to obtain a distance parameter;

calculating a steering gear rotation angle control parameter according to the yaw axis gimbal angle parameter and the distance parameter; and

controlling a rotation direction of a gimbal of a gimbal camera so as to control a rotation direction of the camera according to the yaw axis gimbal angle parameter, and controlling a rotation angle of the steering gear installed in a photographing-moving apparatus for placing the gimbal camera according to the steering gear rotation angle control parameter, in order to drive the photographing-moving apparatus to surround, track and shoot the target, so as to achieve shooting while surrounding the target,

wherein calculating the steering gear rotation angle control parameter according to the yaw axis gimbal angle parameter and the distance parameter further comprises:

calculating an angle deviation of the yaw axis gimbal angle parameter from a predetermined angle parameter, and a distance deviation of the distance parameter from a predetermined radius; and

using a Proportional-Integral-Derivative (PID) algorithm to calculate the steering gear rotation angle control parameter according to the angle deviation and the distance deviation.

2. The automatic surround photographing method for a target according to claim 1 , wherein using the PID algorithm to calculate the steering gear rotation angle control parameter according to the angle deviation and the distance deviation comprises using the PID algorithm to calculate the steering gear rotation angle control parameter:

u=au yaw +bu 1

u yaw =K pyaw ×error yaw +K iyaw ×∫error yaw +K dyaw ×d (error yaw )/ dt;

u 1 =K pl ×error 1 +K i1 ×∫error 1 +K d1 ×d (error 1 )/ dt;

wherein, values of parameters K iyaw , K i1 , K dyaw and K d1 are equal to 0, K pyaw and K p1 are coefficients of proportional terms of the angle deviation and the distance deviation respectively, error yaw and error 1 ; are the angle deviation and the distance deviation respectively, a and b are an angle weight coefficient and a distance weight coefficient respectively, and u yaw and u 1 are the angle control parameter and the distance control parameter respectively.

3. The automatic surround photographing method for a target according to claim 1 , wherein controlling the rotation direction of the gimbal of the gimbal camera so as to control the rotation direction of the camera according to the yaw axis gimbal angle parameter comprises:

calculating an angle deviation of the yaw axis gimbal angle parameter from a predetermined angle parameter; and

controlling the rotation direction of the gimbal of the gimbal camera according to the angle deviation so as to control the rotation direction of the camera.

4. An automatic surround photographing system for a target, comprising:

a gimbal camera, having a gimbal, and a camera and a controller installed on the gimbal, the gimbal being used for adjusting a rotation direction of the camera; and

a photographing-moving apparatus for placing a gimbal camera, the photographing-moving apparatus having a steering gear installed thereon for controlling a steering direction of the photographing-moving apparatus,

wherein the controller includes:

a first processing unit, for obtaining a yaw axis gimbal angle parameter, and processing an image captured by the camera to obtain a distance parameter;

a second processing unit, for obtaining a steering gear rotation angle control parameter according to the yaw axis gimbal angle parameter and the distance parameter;

a control adjusting unit, including a gimbal control unit and a steering gear control unit, the gimbal control unit being used for controlling a rotation of the gimbal of the gimbal camera according to the yaw axis gimbal angle parameter so as to control the rotation direction of the camera, and the steering gear control unit being used for controlling a rotation angle of the steering gear of the photographing-moving apparatus according to the steering gear rotation angle control parameter, so that the photographing-moving apparatus shoots the target while surrounding and tracking the target,

wherein the second processing unit comprises:

a first calculation unit, for calculating an angle deviation of the yaw axis gimbal angle parameter from a predetermined angle parameter and a distance deviation of the distance parameter from a predetermined radius;

the predetermined angle parameter being 90° or −90°;

a Proportional-Integral-Derivative (PID) calculation unit, for calculating a steering gear rotation angle control parameter according to the angle deviation and the distance deviation by a PID algorithm.

5. The automatic surround photographing system for a target according to claim 4 , wherein the PID calculation unit calculates the steering gear rotation angle control parameter by the PID algorithm:

u=au yaw +bu 1

u yaw =K pyaw ×error yaw +K iyaw ×∫error yaw +K dyaw ×d (error yaw )/ dt;

u 1 =K pl ×error 1 +K i1 ×∫error 1 +K d1 ×d (error 1 )/ dt;

wherein, values of parameters K iyaw , K i1 , K dyaw and K d1 are equal to 0, K pyaw and K p1 are coefficients of proportional terms of the angle deviation and the distance deviation respectively, error yaw and error 1 ; are the angle deviation and the distance deviation respectively, a and b are an angle weight coefficient and a distance weight coefficient respectively, and u yaw and u 1 are the angle control parameter and the distance control parameter respectively.

6. The automatic surround photographing system for a target according to claim 4 , wherein the gimbal control unit comprises:

a second calculation unit, for calculating an angle deviation of the yaw axis gimbal angle parameter from a predetermined angle parameter; and

a rotation control unit, for controlling the rotation of the gimbal of the gimbal camera according to the angle deviation, so as to control the rotation direction of the camera.