KR102044435B1 - Electronic teaching desk system - Google Patents

Abstract

The electronic teaching system according to the present invention includes a teaching desk, a transparent board, a camera, a display device, and a system controller. The transparent board is placed in the table, and writing is possible. The camera is disposed behind the transparent board and acquires a writing image written on the transparent board. The display device is disposed behind the transparent board, and projects the lecture material image onto the transparent board whenever it is displayed, and makes the writing image of the transparent board acquired by the camera in a transparent state whenever the lecture material image is not displayed. . The system controller controls whether or not the lecture data image is transmitted to the display device. Whenever the lecture data image is not transmitted to the display device, the system controller receives the image obtained from the camera, removes the background, reverses the image, extracts the written image, and extracts the extracted writing. After synthesizing the images with the lecture data images, the synthesized lecture images are output.

Description

Electronic teaching system {ELECTRONIC TEACHING DESK SYSTEM}

The present invention relates to an electronic teaching system that can be used for lectures and education in classrooms or classrooms of schools and businesses.

In general, wooden blackboards or white boards are widely used as writing tools in classrooms and classrooms of schools and corporations. However, in the case of a wooden blackboard, because chalk is used, there is a problem that the chalk powder may harm the user's health when the writing contents are erased with an eraser. In the case of a white board, the writing is done with a board marker and the writing contents are erased with an eraser. There is a problem that scratches are easily generated so that the writing contents are not erased cleanly.

In addition, since these writing tools are usually installed on the wall, the lecturer writes with the students behind. This can be a major cause of lecturer's loss of control. In addition, when the lecturer writes, part of the writing tool is covered, so the students cannot accurately check the writing.

Patent Application Publication No. 10-1546934 (August 28, 2015)

An object of the present invention is to provide an electronic teaching system that can increase the convenience of the lecture, the control of the lecture can be maximized.

An electronic teaching system according to the present invention for achieving the above object includes a teaching desk, a transparent board, a camera, a display device, and a system controller. The transparent board is placed in the table, and writing is possible. The camera is disposed behind the transparent board and acquires a writing image written on the transparent board. The display device is disposed behind the transparent board, and projects the lecture material image onto the transparent board whenever it is displayed, and makes the writing image of the transparent board acquired by the camera in a transparent state whenever the lecture material image is not displayed. . The system controller controls whether or not the lecture data image is transmitted to the display device. Whenever the lecture data image is not transmitted to the display device, the system controller receives the image obtained from the camera, removes the background, reverses the image, extracts the written image, and extracts the extracted writing. After synthesizing the images with the lecture data images, the synthesized lecture images are output.

Here, the display device may include a teaching beam projector and a liquid crystal device (LCD). The teaching beam projector is arranged behind the transparent board, and can receive the lecture image inverted left and right and project it onto the transparent board. The LCD is attached to the back of the transparent board, and when it becomes opaque according to the ON driving, it projects the lecture data image projected from the desk beam projector onto the transparent board, and becomes transparent by the camera when it becomes transparent according to the OFF driving. The written image of the can be obtained. In addition, the system controller inverts the lecture material image left and right each time the LCD is turned on and sends it to the teaching beam projector, and receives the image obtained from the camera every time the LCD is driven off, and removes the background and reverses the writing image. After extracting the image, synthesize the extracted writing image with the lecture data image and output the synthesized lecture image.

Here, the display device may be a transparent OLED (organic light emitting diode) display device attached to the back of the transparent board.

Here, the electronic lecture table system may further include a classroom beam projector for receiving a synthesized lecture image output from the system control unit and projecting the synthesized lecture image onto the screen of the classroom. The electronic teaching system may further include a communication unit configured to transmit the synthesized lecture image output from the system controller to the Internet lecture server.

According to the present invention, the lecturer can write the familiar board marker while watching the lecture data image through the transparent board, the convenience of the lecture can be increased, and the students can always watch the students can maximize the control of the lecture. When lecturers write, they will not be obscured by the writing, so students can check the writing accurately.

1 is a perspective view of an electronic teaching system according to an embodiment of the present invention.
FIG. 2 is a block diagram of the electronic teaching system shown in FIG. 1.
3 and 4 are diagrams for describing a control process of the system controller in FIG. 2.
5 is a block diagram of an electronic teaching system in accordance with another embodiment of the present invention.

When described in detail with reference to the accompanying drawings for the present invention. Here, the same reference numerals are used for the same components, and repeated descriptions and detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted. Embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for clarity.

1 is a perspective view of an electronic teaching system according to an embodiment of the present invention. FIG. 2 is a block diagram of the electronic teaching system shown in FIG. 1. 3 and 4 are diagrams for describing a control process of the system controller in FIG. 2.

1 to 4, the electronic teaching system 100 according to an embodiment of the present invention includes a teaching table 110, a transparent board 120, a camera 130, a display device 140, and System control unit 160 is included.

The teaching table 110 may have an internal space and have an inclined upper portion. Here, the upper table 110 is formed in the upper inclined portion to mount the transparent board 120. Therefore, the transparent board 120 may be disposed in an inclined state on the table 110, the lecturer can write on the transparent board 120 while looking at the students. The lecture table 110 accommodates a camera 130, a display device 140, and a system controller 160 in an internal space.

The teacher 110 may include buttons 111 for inputting various commands to the system controller 160. When a lighting device and a speaker are installed in a lecture room, the table 110 may be provided with buttons 112 for adjusting lighting and sound. The teaching desk 110 may be provided with a USB connector 113 for connecting a USB device with a system controller. In addition, the table 110 may be provided with a touch pad 114 having a mouse function. The buttons 111 and 112, the USB connector 113, and the touch pad 114 may be disposed on the side of the transparent board 120.

The teaching table 110 may be provided with a tray 115 so as to place a board marker and an eraser on the lower side of the transparent board 120. In addition, the table 110 may be equipped with moving wheels 116 at the bottom to facilitate movement.

The transparent board 120 is disposed in the table 110. The transparent board 120 may be mounted in the upper opening of the table 110. The transparent board 120 is formed to enable writing. The transparent board 120 may have a square shape. Transparent board 120 may be made of a large screen of about 40 inches to facilitate writing. The transparent board 120 may be made of glass, transparent plastic, or the like.

The camera 130 is disposed behind the transparent board 120. The camera 130 is fixed to the internal space of the table 110 in a state where the photographing part is disposed to face the transparent board 120. The camera 130 obtains a writing image written on the transparent board 120 and outputs it to the system controller 160. The camera 130 may be connected to the system controller 160 by wire or wirelessly. The camera 130 may be a charge-coupled device camera or the like. A CCD camera is a device that converts an image into an electrical signal using a charge coupled device (CCD).

The display device 140 is disposed behind the transparent board 120. The display device 140 projects the lecture material image onto the transparent board 120 whenever it is displayed, and writes the image of the transparent board 120 by the camera 130 in a transparent state whenever the lecture material image is not displayed. To be obtained.

For example, the display device 140 may include a teaching beam projector 141 and an LCD 151. The teaching beam projector 141 receives the lecture data image inverted left and right from the system controller 160 and projects the lecture data onto the transparent board 120. The lecture material image provided to the classroom beam projector 141 should be left and right reversed, so that the lecture material image appears correctly when the lecturer looks at the front of the transparent board 120. The teaching beam projector 141 is fixed to the interior space of the teaching table 110 with the beam projecting portion disposed to face the transparent board 120. The teaching beam projector 141 may be connected to the system controller 160 by wire or wirelessly.

The LCD 151 is attached to the rear surface of the transparent board 120. The LCD 151 has a characteristic of changing the liquid crystal transmittance according to the applied voltage. The LCD 151 may be configured to switch from the transparent state to the opaque state during the ON driving and from the opaque state to the transparent state during the OFF driving. The LCD 151 projects the lecture data image projected from the teaching beam projector 141 onto the transparent board 120 when it becomes opaque according to the on driving. Therefore, the lecturer can see the lecture material image projected on the transparent board (120). When the LCD 151 becomes transparent according to the off driving, the writing image of the transparent board 120 is acquired by the camera 130.

The LCD 151 may be made of a white LCD that shows white in the opaque state. The opacity of the LCD 151 may be appropriately set in a range in which the image quality projected onto the transparent board 120 is optimized. The LCD 151 may be made of a polymer dispersed liquid crystal (PDLC) film or the like.

The system controller 160 controls whether the lecture data image is transmitted to the display device 140 and removes the background by receiving the image obtained from the camera 130 whenever the lecture data image is not transmitted to the display device 140. And extracts the writing image by inverting the left and right, synthesizes the extracted writing image with the lecture data image, and outputs the synthesized lecture image.

When the display device 140 includes the classroom beam projector 141 and the LCD 151, the system controller 160 inverts the lecture material image left and right each time the LCD 151 is driven on. Send to (141). The system controller 160 receives the image obtained from the camera 130 and extracts the writing image by removing the background and inverting the left and right sides whenever the LCD 151 is driven off, and synthesizing the extracted writing image with the lecture data image. After that, the composite lecture video is output.

For example, the system controller 160 may include an LCD driver 161, a lecture data image transmitter 162, a writing image processor 163, a composite image transmitter 164, and a switching unit 165. Can be.

The LCD driver 161 outputs a signal for driving the LCD 151. The lecture data image transmitting unit 162 inverts the lecture data image left and right and transmits the lecture data image to the teaching beam projector 141, and transmits the lecture data image to the composite image transmitting unit 164 without inverting the left and right lecture data images.

The writing image processor 163 receives the image obtained from the camera 130, extracts the writing image by removing the background and inverting the left and right, and outputs the writing image to the composite image transmitter 164. In this case, the writing image processor 163 may remove the background from the acquired image of the camera 130 using image processing software, and extract only the writing image to invert left and right.

The composite image transmitter 164 receives the written image extracted by inverting the left and right from the writing image processor 163, receives the synthesized lecture data image from the lecture data image transmitter 162, and then synthesizes the synthesized image. Output the lecture video.

The switching unit 165 may include a switching signal output unit 165a, first and second sub-input driving switches 165b and 165c, and a positive input driving switch 165d. The switching signal output unit 165a outputs a switching signal. The switching signal may be output at a frequency of 24 kHz or more in a pulse width modulation (PWM) manner. The first sub-input driving switch 165b intercepts the LCD driving signal sent from the LCD driver 161 to the LCD 151. The second sub-input driving switch 165c intercepts the lecture data image signal transmitted from the lecture data image transmitter 162 to the classroom beam projector 141. The positive input driving switch 165d intercepts the writing image signal transmitted from the camera 130.

In detail, when the switching signal is off, the first sub-input driving switch 165b operates to transmit the LCD driving signal to the LCD 151, causing the LCD 151 to be opaque. At the moment when the transparent board 120 is opaque by the opaque LCD 160, the second sub-input driving switch 165c operates to transmit the lecture data image signal to the teaching beam projector 141 so that the transparent board 120 is opaque. ), The lecture data image reversed from left to right is projected. At this time, the positive input driving switch 156d operates so as not to transmit the writing image signal to the writing image processing unit 163.

When the switching signal is on, the first sub-input driving switch 165b operates so as not to transmit the LCD driving signal to the LCD 151 to make the LCD 151 transparent, and the second sub-input driving switch 165c It does not transmit the lecture video signal to the teaching beam projector 141. At the moment when the transparent board 120 is made transparent by the transparent LCD 160, the positive input driving switch 165d operates to transmit the writing image signal obtained from the camera 130 to the writing image processor 163.

During the period in which the transparent board 120 becomes transparent and the writing image is acquired, when the lecture material image is projected from the teaching beam projector 141 onto the transparent board 120, the reflection image is reflected on the rear surface of the transparent board 120. Since it is projected onto the 130 may act as a noise, it is possible to block the lecture material image from the beam beam projector 141 to the transparent board 120. Lecture-blocking video can be used for both electronic video and mechanical shutter.

The human eye can't detect flicker when a screen change occurs at a high speed of more than 24 frames per second. Therefore, the on / off frequency of the switching unit 165 is also set as high as possible to eliminate the visual inconvenience that the lecturer recognizes the screen flicker of the transparent board 120. For example, the on / off frequency of the switching unit 165 may be set to at least 30 Hz.

As described above, the on / off signal of the switching unit 165 operates in a PWM manner, by adjusting the duty ratio of screen flickering, and through the transparent board 120 during the off period in which the transparent board 120 becomes transparent. Since the inside of the table 110 is peeked out, the off period is limited to the minimum period for which the camera 130 can acquire the writing image, and the transparent board 120 increases the on period during which the opacity is maximized. Since the afterimages of the camera 130 and the desk beam projector 141 installed at the rear are hardly visually recognized, visual inconvenience may be minimized.

Although not shown, as another example, the display device may be made of a transparent OLED display device, replacing the classroom beam projector 141 and the LCD 151. The transparent OLED display device is attached to the back side of the transparent board 120. The transparent OLED display device displays an image on a screen and has a property of transmitting light in a transparent state when the image is not displayed.

When the display device is formed of a transparent OLED display device, the lecture data image transmitting unit 162 transmits the lecture data image to the transparent OLED display device without inverting the left and right lecture data. The first sub-input driving switch 165b is omitted. The second sub-input driving switch 165c intercepts the lecture data image signal transmitted from the lecture data image transmitter 162 to the transparent OLED display device.

When the switching signal of the switching signal output unit 165a is off, the second sub-input driving switch 165c operates to transfer the lecture data image signal to the transparent OLED display device so that the lecture data image is projected onto the transparent board 120. To be. At this time, the positive input driving switch 156d operates so as not to transmit the writing image signal to the writing image processing unit 163.

When the switching signal of the switching signal output unit 165a is on, the second sub-input driving switch 165c operates to not transmit the lecture data image signal to the transparent OLED display device. When the transparent OLED display device becomes transparent and the transparent board 120 becomes transparent, the positive input driving switch 165d operates to transmit the writing image signal obtained from the camera 130 to the writing image processing unit 163. The on / off frequency of the switching unit 165 is set as high as possible to eliminate the visual inconvenience that the lecturer recognizes the screen flicker of the transparent board (120).

Meanwhile, the electronic teaching system 100 may further include a classroom beam projector 170 that receives the synthesized lecture image output from the system controller 160 and projects the synthesized lecture image on the screen 171 of the classroom. As such, the classroom beam projector 170 projects the lecture image obtained by synthesizing the left and right reversed writing image and the left and right reversed lecture data image on the screen 171, and thus, the students take the lecture data image through the screen 171. You will see what is written above.

According to the above-described electronic teaching system 100, the lecturer can write a familiar board marker while watching the lecture material image through the transparent board 120, the convenience of the lecture can be increased, and can always look at the students Lecture control can be maximized. When lecturers write, they will not be obscured by the writing, so students can check the writing accurately.

5 is a block diagram of an electronic teaching system in accordance with another embodiment of the present invention.

In the electronic teaching system 200 shown in FIG. 5, the transparent board 120 is mounted to the teaching table 210 in an upright position. That is, the transparent board 120 is applied in the form of a conventional blackboard. Teacup 210 is made of a form that can be mounted to the transparent board in the front portion. The electronic teaching system 200 further includes a communication unit 270 that transmits the synthesized lecture image output from the system controller 160 to the Internet lecture server 10. The communication unit 270 is connected to the Internet lecture server 10 through the Internet.

Recently, Internet lecture demand such as MOOC (Massive Open Online Course) is increasing, the electronic teaching system 200 synthesizes the left and right reversed writing images and the left and right reversed lecture data images to produce and store video files for Internet lectures, The Internet lecture video file may be transmitted to the Internet lecture server 10 through the communication unit 270. Therefore, the lectures written by the lecturer can be provided to the students as an Internet lecture.

Meanwhile, when a lecturer installs a green screen on the back of the lecturer based on the position facing the transparent board 120 and utilizes a chroma-key technique, the lecturer removes the background from the image obtained from the camera 130 and writes the writing. When only the image is extracted, the background removal quality can be improved.

Although the present invention has been described with reference to one embodiment shown in the accompanying drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Could be. Accordingly, the true scope of protection of the invention should be defined only by the appended claims.

110, 210. Table 120. Transparent board
130. Camera 140. Display device
141. Beam beam projector 151 LCD
160..System control unit 161..LCD driver
162 .. Lecture image transmission unit 163. Writing image processing unit
164. Synthetic video transmitter 165 Switching unit
170. Classroom beam projector 270 Communication unit

Claims (5)

delete delete Teaching table;
A transparent board disposed on the table, the writing board capable of writing;
A camera disposed behind the transparent board and obtaining a writing image written on the transparent board;
It is attached to the back of the transparent board, and projected to the transparent board every time the lecture material image is displayed, and the writing image of the transparent board is obtained by the camera in a transparent state every time the lecture material image is not displayed A transparent organic light emitting diode (OLED) display device; And
Controls whether or not the lecture data image is transmitted to the transparent OLED display device, and receives the image obtained from the camera whenever the lecture data image is not transmitted to the transparent OLED display device, and removes the background and inverts the left and right to extract the writing image. And a system controller for synthesizing the extracted writing image with the lecture data image and outputting the synthesized lecture image.
The system control unit,
A synthesized image transmitter configured to receive a writing image extracted by being inverted left and right, receive and synthesize a lecture data image that is not inverted left and right, and output a synthesized lecture image;
A lecture data image transmitter for transmitting the lecture data image to the transparent OLED display device and the composite image transmitter without inverting left and right lecture images;
A writing image processing unit which receives the image obtained from the camera and extracts the writing image by removing the background and inverting the left and right sides, and outputting the writing image to the composite image transmitting unit;
Switching outputs a switching signal at a set on / off frequency by PWM (pulse width modulation) method, but controls the duty ratio of screen flickering so that the transparent board is set to be turned off and the transparent board is turned on. A signal output unit, a sub-input driving switch for intermitting the lecture data image signal transmitted from the lecture data image transmitting unit to the transparent OLED display device, and a positive input driving switch for regulating the writing image signal transmitted from the camera It includes; Switching unit,
When the switching signal of the switching signal output unit is off, the sub-input driving switch is operable to transfer the lecture material image signal to the transparent OLED display device so that the lecture material image is projected on the transparent board, and the positive input drive switch Operates to not transmit a writing image signal to the writing image processor.
When the switching signal of the switching signal output unit is on, the sub-input driving switch is operated so as not to transmit a lecture data image signal to the transparent OLED display device, so that the transparent OLED display device becomes transparent, and the positive input driving switch is And a writing image signal obtained from the camera to transfer to the writing image processing unit. The method of claim 3,
And a classroom beam projector for receiving the synthesized lecture image output from the system control unit and projecting the synthesized lecture image onto the screen of the classroom. The method of claim 3,
And a communication unit for transmitting the synthesized lecture image output from the system controller to an Internet lecture server.

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