KR100559726B1 - System and Method of auto-tracking lecturer - Google Patents

Abstract

The present invention relates to a tracking system and a tracking method for continuously tracking a moving object by receiving a transmission signal of a continuously installed external sensor.

Among them, the system of the present invention comprises: a plurality of sensors arranged on one side of the pulpit at a constant height and at regular intervals to detect the position of the instructor; A video camera capable of zoom-in / zoom-out, tilting, and panning, and shooting while tracking an instructor according to a control command; And various settings such as system setting at the time of installation and user definition if necessary, and a controller for controlling the video camera to receive the detection signal of the sensor during operation and move the video camera to the corresponding instructor position.

Therefore, the present invention can configure a dynamic screen in the Internet lecture or remote lecture, and can reduce the labor cost for video camera operation.

Tracking, Video Camera, Sensor, Move, Tracking, Zoom In / Zoom Out, Focusing

Description

System and Method of auto-tracking lecturer}

1 is a schematic diagram illustrating a concept according to the present invention;

Figure 2 is a block diagram showing the configuration of the automatic instructor tracking system according to the present invention,

3 is a block diagram illustrating the configuration of the controller shown in FIG. 2;

Figure 4 is a flow chart showing the procedure for setting the system when installing the automatic instructor tracking system of the present invention,

5 is a flowchart illustrating a user-defined procedure in the automatic instructor tracking system of the present invention,

Figure 6 is a flow chart showing the instructor tracking procedure in the automatic instructor tracking system according to the present invention.

* Explanation of symbols for main parts of the drawings

10-1 to 10-n: Sensor 20: Controller

21: I / O port 22: processor

23: serial communication port 24: display

25: EEPROM 30: Video camera

The present invention relates to a target tracking technique that allows a video camera to track a subject. More particularly, the present invention relates to a tracking system and a tracking method for continuously tracking a moving object by receiving a transmission signal of a continuously installed external sensor.

Recently, due to the remarkable development of electronic communication technology, the electronic education environment is also rapidly progressing. In other words, the video education system is installed in the classroom to maximize the educational effect by simultaneously illuminating the video materials with the lecture.

In addition, due to the spatial problem of the capacity of the lecture room, the lecture situation currently being executed in one room is recorded with a video camera and broadcasted or recorded on a large display installed in another space spaced apart. Can be performed.

On the other hand, as the online cyber courses through the Internet have exploded, the shooting of video lecture materials has been increasing.

In light of this current trend, the demand for video lecture materials is rapidly increasing.

In general, the video camera that shoots the instructor when the lecturer lectures in the Internet classroom or distance learning system is taken only from a fixed angle, so the instructor could not move outside the designated place, and the information had to be transmitted only by the passive screen. Therefore, when the lecture screen is not colorful and diverse, it is monotonously illuminated, and thus the concentration of gaze falls, and the instructor cannot escape the angle of the video camera, and thus there is a problem that the lecture cannot be performed in various expressions.

In order to solve this problem, conventionally, the person who adjusts the video camera had to keep track of the instructor continuously during the lecture time, which was inconvenient and increased labor costs.

Therefore, conventionally, a position transmitter is worn on the body of the instructor, and the angle of the video camera tracks the position of the instructor by receiving the position signal provided from the position transmitter in the video camera. However, such a technique has a problem in that a facility value is increased by using a wireless transmission / reception technology in order to transmit and receive location information between a location transmitter and a video camera. In addition, since the instructor is moving at various angles during the lecture, there was a problem that an error occurred that the video camera could not properly track the position of the instructor due to the infrared transmission and reception according to the position of the instructor.

An object of the present invention is to solve the problems described above, the sensor is installed in the pulpit moves by the instructor, when the signal is transmitted when the operation of these sensors, the controller moves the video camera to the location corresponding to each sensor position It is to provide a tracking system and tracking method that can rotate and track the instructor at a proper speed according to the movement of the instructor.                         

It is another object of the present invention to provide a tracking system and method that is reliable and inexpensive to operate.

In order to achieve the above object, the system of the present invention comprises a plurality of sensors for detecting the position of the target (instructor) arranged in a row at a constant height and a constant interval across the platform; A video camera capable of zoom-in / zoom-out, tilting, and panning, and shooting while tracking a target (instructor) according to a control command; And a controller for controlling the video camera to move the video camera to a corresponding target (instructor) position by receiving the detection signal of the sensor during operation. It is characterized by including.

Here, the controller is a key input means for the operation, a display unit for displaying the operation state and the set value, an input / output port for interfacing with the sensor, a serial communication port for interfacing with the video camera, the e-pirom for storing the set value And executing a predetermined software, storing a setting value in the Y-Pyrom according to the key input, controlling the display unit, and controlling a control signal for moving the video camera according to a sensor signal input through the input / output port. It consists of a processor that outputs through the serial communication port.

Many sensors consist of infrared sensors and each sensor has an adjusting volume for adjusting the sensing distance.

In addition, the method of the present invention for achieving the above object, the system setting step of setting the number of sensors, the number of sensors located in the center, the distance between the sensor and the sensor, the panning speed, left / right limit value; Custom steps to handle tilt adjustment to set the video camera's tilt value, zoom adjustment to adjust the video camera's zoom, zoom area adjustment to be performed when the zoom function is turned on, and focus adjustment to be performed when the zoom function is turned off. ; And a tracking step of tracking a target (instructor) by moving the video camera according to the detection signals input from the sensors after the adjustment is completed.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic diagram illustrating the instructor tracking concept according to the present invention, in which n infrared sensors 10-1 to 10-n are installed at a predetermined interval behind a lecture room pulpit, and an instructor is located in front of the pulpit. The opposite side of the instructor is provided with a video camera 30 for tracking the instructor under the control of the controller 20. The infrared sensors detect an object by forming a light emitting unit and a light receiving unit integrally to emit infrared rays forward through the light emitting unit and to receive infrared rays reflected from the object to the light receiving unit. The sensing distance is adjusted within about 1.5m by considering the front and rear width of the platform through the adjusting volume. If the table is installed on the right or left side of the pulpit, the sensing distance of the corresponding sensors is set so that the table is not detected.

When the instructor moves in the pulpit installed with the system of the present invention as described above, the sensors 10-1 to 10-n detect the position of the instructor and transmit it to the controller 20, and the controller 20 accordingly has a video camera ( 30, the video camera 30 can keep track of the instructor.

Figure 2 is a block diagram showing the configuration of the instructor tracking system according to the present invention.

Instructor tracking system according to the present invention is arranged in a row at a constant height and a constant interval across the pulpit as shown in Figure 2 and a plurality of sensors (10-1 ~ 10-n) for detecting the position of the instructor and In addition, various settings such as system setting at the time of installation and user-defined when necessary are possible, and a controller 20 for controlling the video camera 30 by receiving the detection signal of the sensor, various operations such as zoom in / zoom out function, tilting and panning The video camera 30 is capable of photographing while tracking the instructor according to the control command of the controller 20.

Referring to FIG. 2, N sensors 10-1 to 10-n are connected as inputs to an input / output port of the controller (21 in FIG. 3), and the video camera 30 is connected to an RS232C serial communication port (FIG. 3). Is connected via 23). Each sensor 10-1 to 10-n is installed at a predetermined height and a predetermined interval on the rear side of the pulpit as shown in FIG. 1 to detect the position of the instructor and transmit the detected signal through the I / O port 21 to the processor ( 3, 22). In the exemplary embodiment of the present invention, the controller controls the video camera through the serial communication port, but may be controlled wirelessly through an infrared signal (remote control signal).

As shown in FIG. 3, the controller 20 includes an input / output (I / O) port 21 for connecting the sensors 10-1 to 10-n, and a menu button K1 for operation. ), SET button K2, down button K3, UP button K4, processor 22 for controlling the overall operation, and video camera 30 for communication. An RS232C driver 23, an LCD, a display section 24 for displaying an operation state, an EPI 25 for storing setting values, and the like.

The UP button K4 increases or changes the set value, the DN button K3 decreases or changes the set value, and the SET button K2 saves the changed set value. use. The MENU button K1 is used to select the menu to be set.

The video camera 30 is a high resolution image video camera equipped with a pan / tilt pedestal and is connected to the controller 20 through an RS-232C cable (or a remote control signal) to control the controller 20. Follow instructors to track instructors. There are automatic exposure and background lighting correction functions to maintain the brightness of the subject and the backlight, and there is an auto zoom function to always capture a stable subject according to the size of the subject.

Figure 4 is a flow chart showing the procedure for setting up the system when installing the instructor tracking system of the present invention.

Referring to FIG. 4, when the system according to the present invention is first installed, an operation button (MENU button, SET button, down button, up button) of the controller 20 (K1 ~). Use K4) to set the number of sensors, sensor number located in the center, distance between sensors, panning speed, left limit value and right limit value. It is desirable to prevent such system settings from being operated by general users and set them up only by installers and administrators.

In the sensor number setting step 401, the total number of the installed sensors 10-1 to 10-n is set. In the embodiment of the present invention, up to 8 to 32 can be set. And in the sensor number setting step 402 located in the center to set the number (3 ~ 27) of the sensor located in the center in the installed sensor, in the distance setting step 403 between the sensor to the distance between the sensor and the sensor to 10 ~ 50cm Set it.

In the panning speed setting step 404, the panning speed of the video camera is set from 0 to 24. At this time, it is low speed toward 0, and high speed toward 24.

In the left threshold value setting step 405, when the instructor is out of the detection range of the leftmost sensor, the video camera 30 moves to the left to set a distance to be shown. 0 ~ 100Cm can be set. In the right limit value setting step 406, when the instructor is out of the detection range of the rightmost sensor, the video camera 30 moves to the right to set the distance to be shown. 0 ~ 100Cm can be set.

FIG. 5 is a flowchart illustrating a user-defined procedure in the instructor tracking system according to the present invention, and includes a tilt adjustment step 503 to 506, a zoom adjustment step 507, and a zoom area adjustment step according to the selection of the menu button K1. 508, focus adjustment step 509.

Referring to FIG. 5, when the letter “CATS Tracking” is displayed on the display unit 24, a desired adjustment function is selected and adjusted by operating the menu button K1 (501, 502). When the menu button K1 is pressed once, the tilt adjustment steps 503 to 506 are executed.

In the tilt adjustment step, the letter “TILT VALUE: [0000]” is displayed on the display unit 24. At this time, the upside down button is set using the up / down buttons (K3, K4) and the set button (K2) is selected. Press () to save the set values (503 to 506). The tilt value that can be used at this time is from "FED4 (down)" to "012C (up)", and the center value is "0000".

Press the menu button K1 twice or press the menu button K1 once in the tilt adjustment step to display “ZOOM VALUE: ON (OFF)”. When using the variable zoom function "ON", when using the instructor fixed zoom "OFF" is selected by using the up / down buttons (K3, K4) and then stored by pressing the set button (K2) (507). When "ON" is selected, the menu for the zoom area is displayed in the next step, and when "OFF" is selected, the focus adjustment menu is displayed by skipping the zoom area menu. The value of the instructor fixed zoom is determined by the value of "ZOOM AREA 1 [M] VALUE: [3FF]", so you must set the zoom area value once even when using the instructor fixed only.

When ON is selected for zoom on / off, "ZOOM AREA 1 [M]: [03FF]" is displayed (508). "1 [M]" is when the instructor and another person are on the pulpit and the distance between them is about 1 meter. While looking at the monitor, use the up / down buttons (K3, K4) to set the zoom value. And press set button K2 to save (508). You can set the distance from 2 [M] to 9 [M]. Available values are "0000 (zoom out)" to "03FF (zoom in).

When OFF is selected for zoom on / off, “FOCUS AUTO / FAR VALUE: AUTO” is displayed .. The “AUTO” and “FAR” values are selected with the up / down buttons (K3, K4) and set. Press button (K2) to save, generally use "AUTO", and use "FAR" only if distance from instructor is over 15m and auto focusing fails (509). The tracking function is turned on (510, 511).

6 is a flow chart showing the instructor tracking procedure in the instructor tracking system according to the present invention.

After all adjustments are completed, if the instructor moves in the pulpit, the sensors 10-1 to 10-n detect this (601). The microprocessor 22 receives the detection signals from all the sensors 10-1 to 10-n, and if the instructor is single (1 person), the microprocessor 22 moves and tracks the video camera 30 according to the detected signal, If two or more persons), after zooming out, the video camera 30 is moved and tracked (602 to 604). If video camera tracking does not proceed normally, an error message is output (605, 606). For example, when a command is given to the video camera 30, but the video camera 30 does not operate properly or there is a lot of noise in the serial cable or a problem in the video camera 30, an "Error Camera" message is output. If a command is given to the video camera 30 but the command itself is not transmitted for more than 1 minute, or the cable is cut or contacted poorly, an "Error Communication" message is output.

If the instructor determines whether the left / right sensor is out of the left / right sensor (ie, if it is over), the video camera 30 is moved to the left / right threshold value position set in the system setting step (607, 608).

In the above, the present invention has been described as an example of tracing the instructor in front of the pulpit, but the present invention can be applied to the tracing of other targets (targets) as well as the instructor tracking.

As described above, in the present invention, if the instructor continuously installs the sensor in the whole area lectured by the lectern, and the sensor detects the movement of the instructor and transmits the sensor to the controller, the controller calculates the value in consideration of a preset value and the like. By controlling the video camera to be moved to the location, the instructor can be tracked and photographed so that a dynamic screen can be configured in the Internet lecture or the remote lecture, and the labor cost for manipulating the video camera can be reduced.

Although described above with reference to a preferred embodiment of the present invention, those skilled in the art will be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below I can understand that you can.

Claims (10)

A plurality of sensors arranged in a row at a constant height and at regular intervals across the platform to detect the position of the instructor in the surveillance area; A video camera capable of zoom-in / zoom-out, tilting, and panning to capture and track the instructor according to a control command; And Various settings such as system setting at the time of installation and user-defined when necessary are possible, and during operation, the sensor receives the detection signals of the plurality of sensors and pans the video camera to the location of the instructor, and the instructor is at the edge of the plurality of sensors. And a controller for controlling the panning of the video camera to the left / right threshold value position set in the system setting process when it is out of the range of the left / right sensor located at. The controller includes a key input means for operation, a display portion for displaying an operation state and a set value, an input / output port for interfacing with a sensor, a communication means for interfacing with a video camera, an e-pyrom for storing a set value, and a predetermined value. Control to store a setting value in the YPIROM according to a key input of the key input means, control the display unit, and pan and tilt the video camera according to a sensor signal input through the input / output port by executing software. Automatic instructor tracking system comprising a processor for outputting a signal through the communication means. delete delete The method of claim 1, wherein the customization is performed by adjusting a tilt to set a tilt value of the video camera, a zoom to adjust the zoom of the video camera, a zoom area to be performed when the zoom function is turned on, and a zoom to be turned off. Automatic instructor tracking system, characterized in that consisting of the focus adjustment. The automatic instructor tracking system according to claim 1, wherein the system setting sets a number of sensors, a number of sensors located at a center, a distance between the sensors, a panning speed, and a left / right limit value. The automatic instructor tracking system of claim 1, wherein the plurality of sensors are infrared sensors. 7. The automatic instructor tracking system according to claim 6, wherein the infrared sensor is provided with an adjusting volume for adjusting the sensing distance. The automatic instructor tracking system according to claim 1, wherein the video camera and the controller are connected in a serial communication method. delete delete

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