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A linkage camera control system and control method

A control system and camera technology, applied in the direction of using feedback control, TV system components, TV, etc., can solve problems such as lost steps, and achieve the effect of improving the driving torque and completely reliable rotation control

Active Publication Date: 2019-05-10
BEIJING DEEPGLINT INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of this application proposes a linkage camera control system and control method to solve the technical problem that in the prior art, if the monitoring system uses an open-loop stepping motor to control the rotation, although it can be completely stationary, step loss will occur.

Method used

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  • A linkage camera control system and control method
  • A linkage camera control system and control method
  • A linkage camera control system and control method

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Experimental program
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Embodiment 1

[0045] figure 1 A schematic structural diagram of a linked camera control system in Embodiment 1 of the present application is shown. As shown in the figure, the linked camera control system may include: a controller 101, a driver 102, a stepping motor 103, a transmission mechanism 104, and an actuator 105 and encoder 106, where,

[0046] The controller is configured to send pulse width modulation (PWM, PulseWidth Modulation) pulses to the driver at a pulse frequency f(n), where n represents the nth step of subdivision of the stepping motor;

[0047] The driver is used to control the rotation of the stepper motor after receiving the PWM pulse;

[0048] The transmission mechanism is used to increase the driving torque to a preset value;

[0049] The actuator is used to rotate under the driving force of the stepping motor;

[0050] The encoder is used to record the rotation angle value of the actuator;

[0051] The step is further used to drive the stepping motor at a preset...

Embodiment 2

[0102] Based on the same inventive concept, an embodiment of the present application also proposes a method for controlling a linked camera, which will be described below.

[0103] image 3 It shows a schematic flowchart of the implementation of the linked camera control method in Embodiment 2 of the present application. As shown in the figure, the linked camera control method may include the following steps:

[0104]Step 301, the controller sends pulse width modulated PWM pulses to the driver at the acceleration frequency; the acceleration frequency is initially the preset frequency f s , increasing sinusoidally to the highest frequency f MAX ;

[0105] Step 302, the driver controls the rotation of the stepper motor after receiving the PWM pulse;

[0106] Step 303, the transmission mechanism increases the driving torque to a preset value;

[0107] Step 304, the actuator rotates under the driving force of the stepping motor;

[0108] Step 305, the controller reads the rot...

Embodiment 3

[0141] The present application can be used in a specific scene where a linked camera is used for video surveillance, and the linked camera can include a wide-angle camera, a telephoto camera and the control system provided by the present application, which will be described below.

[0142] Figure 4 It shows a schematic structural diagram of the linked camera control system in the video surveillance scene in Embodiment 3 of the present application. As shown in the figure, the linked camera control system (hereinafter referred to as the control system) may include: ARM Cortex-M processor, driver, Stepper motors, reducers, rotary mirrors and absolute encoders.

[0143] The wide-angle camera and the telephoto camera are respectively connected to the control system provided by the application, and the lens of the telephoto camera is placed opposite to the rotating mirror in the control system. During specific implementation, the lens of the telephoto camera The midpoint may be on...

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Abstract

This application provides a linkage camera control system and control method. The system includes a controller, a driver, a stepping motor, a transmission mechanism, an actuator, and an encoder. The controller is used to send a pulse width modulation signal to the driver at a pulse frequency f(n). PWM pulse, the n represents the nth step of the stepping motor subdivision microstep; the driver is used to control the rotation of the stepping motor after receiving the PWM pulse; the transmission mechanism is used to increase the driving torque to a preset value; the actuator is used to Rotate under the driving force of the stepping motor; the encoder is used to record the angle value of the actuator rotation; the controller is further used to drive the stepping motor at a preset frequency f when the difference between the angle value and the expected value is judged to be greater than the preset error range s Turn to preset time. In this application, the controller sends a pulse signal to the driver to control the rotation of the stepper motor, which can be completely static, and because the feedback device is added to form a closed-loop system, the occurrence of lost steps can be avoided and the rotation control is completely reliable.

Description

technical field [0001] The present application relates to the technical field of video surveillance, and in particular to a linkage camera control system and control method. Background technique [0002] The linkage between the trigger and the dome camera of the surveillance camera is usually realized by controlling the rotation of the rotating mirror on two degrees of freedom. Fast rotation within 180° clockwise / counterclockwise, no cumulative error, steady-state error less than the required value, anti-interference, stable movement without disturbance, high accuracy (for example: less than 0.1°), cost control, etc. [0003] At present, the control of the rotating mirror can be controlled by a servo motor, and the servo motor is used. Because the structure of the servo motor itself and the characteristics of the motor determine that the servo motor cannot be absolutely static when it stops, the rotating mirror at the execution end will occasionally shake slightly, which wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232G05D3/12
CPCG05D3/12H04N23/66
Inventor 骆天麒
Owner BEIJING DEEPGLINT INFORMATION TECH
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