CN111405219A - Video shooting and recording device and method - Google Patents

Video shooting and recording device and method Download PDF

Info

Publication number
CN111405219A
CN111405219A CN202010361478.2A CN202010361478A CN111405219A CN 111405219 A CN111405219 A CN 111405219A CN 202010361478 A CN202010361478 A CN 202010361478A CN 111405219 A CN111405219 A CN 111405219A
Authority
CN
China
Prior art keywords
writing
camera
writing board
light
video
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010361478.2A
Other languages
Chinese (zh)
Inventor
李东旭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN202010361478.2A priority Critical patent/CN111405219A/en
Publication of CN111405219A publication Critical patent/CN111405219A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/56Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/60Control of cameras or camera modules
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/222Studio circuitry; Studio devices; Studio equipment

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Drawing Aids And Blackboards (AREA)

Abstract

The invention discloses a video shooting and recording device and a video shooting and recording method, wherein the recording device comprises a writing board and a camera, the writing board is fixed on a frame, the camera is arranged in front of the writing board, the camera is connected with a control console, the control console is arranged on one side of the writing board, the writing board is transparent, a presenter writes a writing on the writing board behind the writing board, the video shooting and recording device also comprises a mirror image assembly, the mirror image assembly is arranged close to the camera, and the plane mirror adjusts the presentation sequence of the writing on the writing board captured by the camera into the writing sequence of the presenter. According to the video shooting and recording device, the video camera can capture a presenter and a blackboard writing on the writing board simultaneously through the transparent writing board, the presenter always faces to a viewer, and the interactive effect of online teaching is greatly improved through the combination of the blackboard writing and a slide.

Description

Video shooting and recording device and method
Technical Field
The present invention relates to a shooting and recording device, and more particularly, to a video shooting and recording device and method.
Background
In recent years, recording and broadcasting systems are more and more widely applied, the requirements of real-time recording, live broadcasting, later-period on-demand and the like of various activities in various industries are rapidly increased, and recorded video files are used for recording, learning and sharing. In particular, in the industries of schools and education and training, the construction of high-quality video resources is the key direction of the information construction of school education, such as video recording of video resources of high-quality classes, micro-classes, fine-quality classes and the like. Therefore, it is very urgent to generate a video course resource with high appreciation and good effect. However, the current support of this demanding productized application throughout the video recording industry has not met the expectations of users.
Disclosure of Invention
The invention aims to provide a video shooting and recording device and a video shooting and recording method, which aim to solve the technical problems mentioned in the background technology.
In order to achieve the above object, the specific technical solution of the video shooting and recording apparatus and method of the present invention is as follows:
the utility model provides a video shooting recording device, includes clipboard and camera, and the clipboard is fixed on the frame, and the camera setting is in the place ahead of clipboard, and the camera is connected with the control cabinet, and the control cabinet setting is in one side of clipboard, and the clipboard is transparent, and the demonstration person is located clipboard rear writing, still includes the mirror image subassembly, and the mirror image subassembly is close to the camera setting, and the level crossing is adjusted the demonstration order of the board writing of camera capture for the demonstration person's writing order.
Further, the mirror image component is a plane mirror, the camera and the writing board are arranged on the same side of the mirror surface of the plane mirror, and the included angle between the plane mirror and the lens plane of the camera is 30-60 degrees.
Further, a mirror component built in the mirror component camera or mirror software carried in a computer of the console is provided, and a lens of the camera is arranged opposite to the writing board.
Furthermore, the writing board is a transparent board made of glass or acrylic materials.
Furthermore, the shooting and recording device further comprises a background light source, the background light source comprises a top lamp and a light supplement lamp, the top lamp is arranged behind the demonstrator, the top lamp is a rear top lamp with a reflector curtain, the light supplement lamp is arranged close to the writing board, and the number of the writing tools and the number of the light supplement lamps to be started are determined according to the color of the reflector curtain.
Further, the light filling lamps include two sets of, and two sets of light filling lamps set up the left and right sides at the clipboard relatively, and every light filling lamp of group all includes key lamp and auxiliary lamp, and key lamp and auxiliary lamp set up respectively in the front and rear of clipboard.
Further, when the color of the reflector curtain is white, the writing tool is a water color pen, and 0-2 groups of light supplement lamps are turned on.
Further, when the color of the reflector curtain is non-white, the writing tool is a highlighter, and at least 1 group of light supplement lamps is turned on.
Furthermore, the side wall of the writing board is provided with L ED lamp belts, the L ED lamp belts are white lamp belts, and the L ED lamp belts are arranged on the opposite sides of the writing board or the four sides of the writing board.
Furthermore, the frame is made of metal materials, a groove for fixing the writing board is formed in the inner edge of the frame, and a buffer layer is arranged between the writing board and the groove.
Furthermore, the shooting and recording device further comprises a microphone and a prompter, wherein the microphone is used for amplifying the sound of the presenter, the microphone is connected with the loudspeaker, and the prompter is arranged on one side of the camera.
A video shooting and recording method mainly comprises the following steps:
setting the placing positions of the writing board and the camera according to the type of the mirror image component;
the video camera is started, the demonstrator is located behind the writing board to write the writing board, and the mirror image assembly adjusts the demonstration sequence of the writing board captured by the video camera to the writing sequence of the demonstrator.
Further, the method also comprises a light supplement step:
the number of the writing tools and the light supplement lamps to be started is determined according to the color of the reflector curtain,
when the color of the reflector curtain is white, writing by using a water color pen, and starting 0-2 groups of light supplement lamps;
when the color of the reflector curtain is non-white, a fluorescent pen is used for writing, and at least 1 group of light supplement lamps and L ED lamp belts are turned on.
The video shooting and recording device and method provided by the invention have the following advantages:
the video shooting and recording device is provided with the transparent writing board, a presenter is arranged behind the writing board, and the video camera can capture the presenter and the writing on the writing board simultaneously through the transparent writing board, so that the presenter still faces to a viewer when writing on the writing board, and interacts with the viewer through the combination of the writing on the writing board, a slide and other materials, thereby greatly improving the interaction effect of online teaching.
Drawings
FIG. 1 is a schematic structural diagram of a video recording apparatus according to the present invention;
FIG. 2 is a top view of the video recording apparatus of the present invention;
FIG. 3 is a schematic view of the structure of the writing board of the present invention when it is fixed to the frame;
FIG. 4 is a diagram of the light path of the present invention when not writing on the writing board;
FIG. 5 is a diagram of the light path of the writing board after writing characters;
FIG. 6 is a light path diagram of the present invention without a mirror assembly;
fig. 7 is a light path diagram of the present invention after being reflected by a plane mirror.
The numbers in the figure indicate 1, a writing board, 2, a frame, 3, a shooting and recording assembly, 31, a camera, 32, a console, 4, a fill-in light, 5, a loudspeaker, 6, a top light, 7, a prompter, 8, L ED lamp strips, 9 and a buffer layer.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, a video shooting and recording apparatus and method of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1-2, the video shooting and recording device of the present invention includes a writing board 1 and a shooting and recording assembly 3, the writing board 1 is fixed on a frame 2, the shooting and recording assembly 3 includes a camera 31 and a console 32, the camera 31 is disposed in front of the writing board 1, the console 32 is disposed on one side of the writing board 1, the camera 31 is connected to the console 32, the writing board 1 is transparent, and the video shooting assembly includes a mirror image assembly, the mirror image assembly is disposed near the camera 31, a presenter is located behind the writing board 1 to write a board book, and the mirror image assembly adjusts a presentation sequence of the board book captured by the camera 31 to the writing sequence of the presenter.
The imaging principle of the camera 31 is the same as that of the eyeball of human eye, and after the light is captured by the lens of the camera 31, the light is captured by the photosensitive imaging sheet (transistor or other electronic element) of the camera 31 in the form of reverse image through the lens. As shown in fig. 6, if the presenter writes 123456 series of numbers, with the presenter facing straight ahead as a frame of reference, the number 1 is on the right side of the presenter and the number 6 is on the left side, and the image captured by the camera 31 is inverted with the number 1 on the left side and the number 6 on the right side. That is, the order of presentation of the board book as seen by the viewer is reversed from the order of writing by the presenter.
The mirror image component is a plane mirror, the camera 31 and the writing board 1 are arranged on the same side of the mirror surface of the plane mirror, and an included angle is formed between the plane mirror and the lens plane of the camera 31. The angle between the plane mirror and the lens plane of the camera 31 is between 30 ° and 60 °, preferably 45 °. As shown in fig. 7, when the presenter writes 123456 series of numbers with the presenter facing straight ahead as the frame of reference, the number 1 on the presenter's right side and the number 6 on the left side, and the camera 31 passes through a flat mirror placed at 45 degrees to the lens plane, the captured image is the number 1 on the right side and the number 6 on the left side, which is the same as the position seen by the presenter. With the assistance of the plane mirror, the image captured by the camera 31 is a vertically inverted image, and the characters are displayed in the correct order.
In addition, the mirror assembly may be a mirror component built into the camera 31 or mirror software built into the computer, so that the viewer sees the board book written in the normal order from left to right. At this time, the lens of the camera 31 is disposed to face the tablet 1.
The writing board 1 is a transparent board made of glass or acrylic materials, such as a low-iron ultra-white glass board, 1m × 2m or other sizes can be selected, the thickness of the writing board 1 is 0.5-1 cm, and preferably, the thickness of the writing board 1 is 1 cm.
The background light source comprises a top lamp 6 and a light supplement lamp 4, the top lamp 6 is arranged at the rear of a presenter, the top lamp 6 is a rear top lamp 6 with a polyester film reflector curtain and illuminates from the oblique rear of the presenter, the presenter writes on the writing board 1 by using a writing tool, the light supplement lamp 4 is close to the writing board 1, and the writing tool is selected according to the color of the reflector curtain and the number of the light supplement lamp 4 is determined.
The light filling lamp 4 includes two sets ofly, and two sets of light filling lamps 4 set up in the left and right sides of clipboard 1 relatively, and every light filling lamp 4 of group all includes key lamp and auxiliary lamp, and key lamp and auxiliary lamp set up in the front and back of clipboard 1 for illuminating demonstration person and blackboard writing, according to the colour of background, confirm whether the light filling lamp 4 opens and the quantity opened. Fill light 4 is placed at a sufficient distance from tablet 1 so that camera 31 does not see their image on tablet 1.
When the color of the reflector curtain is white, a water color pen is selected, and 0-2 groups of light supplement lamps 4 are started; when the color of the reflector curtain is non-white, a highlighter is selected for writing, at least 1 group of light supplement lamps 4 are started, and a 6mm thick-head highlighter is used for achieving the best effect.
As shown in fig. 3, when the background is non-white, such as black, green, etc., the recording device further includes L ED light strips, L ED light strips 8 are disposed on the side wall of the tablet 1, L ED light strips 8 are 12V or 220V voltage-driven white light strips, L ED light strips 8 are disposed on the opposite sides of the tablet 1 or the four sides of the tablet 1, light emitted from L ED light strips 8 enters from the edge of the tablet 1, and the light propagates to all parts of the tablet 1 through total reflection in the tablet 1, so as to illuminate the tablet 1.
When the presenter is not writing on the writing board 1, light emitted from the L ED lamp strip 8 is totally reflected in the writing board 1, when the presenter is located behind the writing board 1 and writes on the writing board through the writing pen, light emitted from the L ED lamp strip 8 overflows to the outside of the writing board 1 after being reflected or refracted by the writing board, and is shot and recorded by the camera 31 after being mirrored by the mirror image assembly, the camera 31 can capture the writing board on the presenter and the writing board 1 simultaneously through the transparent writing board 1, so that the presenter can still move to the viewer when writing on the writing board, and the interaction effect of online teaching is greatly improved by combining materials such as writing on the writing board, slides and the like with the viewer.
L ED lamp area 8 is connected with the brightness controller electricity, and the brightness controller can adjust L ED lamp area 8's voltage or electric current in order to adjust the luminance of L ED lamp area 8, helps controlling the luminance of clipboard 1 to promote the quality of video shooting.
Frame 2 is the frame 2 of being made by materials such as timber, metal, and the inner edge of frame 2 sets up the recess of fixed clipboard 1, behind the recess was arranged in on clipboard 1 each side, set up buffer layer 9 such as heat-conducting glue, bubble cotton between clipboard 1 and the recess, preferably, frame 2 is the metal crate 2 of being made by materials such as aluminium or steel, and metal crate 2 is favorable to L ED lamp area 8 heat dissipation, and frame 2 bottom sets up the landing leg, and the landing leg can be fixed landing leg or liftable landing leg.
Besides, the writing board 1 can be fixed by the fixing holes and the bolts, and the fixing modes of the writing board 1 are various and are not described any more.
The environment light can reflect to the shooting signal source (camera 31/camera) through the glass face, and the light that monitoring computer screen or prompter 7 emitted also can reflect to the shooting signal source through the glass face, and this shooting recorder still includes the polaroid of setting in camera 31 camera lens department, and the polaroid can filter the polarized light that reflects to the shooting signal source from the glass face to promote the shooting effect.
For the presenter to take place, the shooting and recording device also comprises a microphone for amplifying the sound of the presenter, which microphone is connected to a loudspeaker 5. The microphone can be a wired professional microphone, so that the environmental noise can be effectively reduced, or a wireless microphone with a transmitter and a receiver is selected, and noise reduction cotton or noise reduction foam can be pasted on the wall surface in a space with larger echo, so that the echo is reduced.
Both the camera 31 and the microphone are connected to a console 32, the console 32 comprising at least one computer with a monitor, on which a video switcher is mounted that combines signals from the camera 31, microphone and other video sources with the prepared slides.
When light enters a medium with a lower refractive index from a medium with a higher refractive index, as shown in fig. 4, when light enters an air medium from a glass medium, the bead of the L ED lamp strip 8 is regarded as a point light source, and when the L ED lamp strip 8 is lighted, the incident angle of the light is larger than the critical angle (41.8 degrees) of the light entering the air from the glass according to Snell's law (Snell's L aw), so the refracted light will disappear and all the incident light will be reflected and not enter the medium with a lower refractive index.
As shown in fig. 5, after writing on the writing board 1 by using the highlighter, the notes of the highlighter leave traces on the glass, which can be understood as a third medium other than glass and air, and the light in the writing board 1 no longer enters the air directly from the original glass at the traces, but passes through the trace medium left by the highlighter, thereby changing the medium route in the light propagation path, i.e. from the original glass-air to the glass-fluorescent trace-air, according to snell's law, the refraction medium and the refraction index in the equation change, so that the light is no longer totally reflected at the positions written by the fluorescence, and the colored particles in the ink also reflect the light to the front of the writing board 1, and then are captured by the camera 31.
In order to achieve the best shooting and recording effect, the shooting and recording device further comprises a prompter 7, wherein the prompter 7 is arranged on one side of the camera 31 and can be a large-size computer screen or a television.
The application also provides a video shooting and recording method, which mainly comprises the following steps:
setting the placing positions of the writing board 1 and the camera 31 according to the type of the mirror image assembly;
the camera 31 is turned on and the presenter writes the blackboard writing behind the writing board 1 and the mirror image assembly adjusts the presentation sequence in which the camera 31 captures the blackboard writing to the presentation sequence of the presenter.
In order to make the camera 31 shoot a clear picture, the recording method further includes a supplementary lighting step:
the number of the writing tools and the fill light 4 to be turned on is determined according to the color of the reflector curtain,
when the color of the reflector curtain is white, writing by using a water color pen, and starting 0-2 groups of light supplement lamps 4;
when the color of the reflector curtain is non-white, a fluorescent pen is used for writing, and at least 1 group of light supplement lamps 4 and L ED lamp belts 8 are turned on.
The recording method can be widely applied to various scenes such as video course recording, conference live broadcasting, live broadcasting tape delivery and the like.
This shoot and record device sets up transparent clipboard 1, and the presenter is in clipboard 1 rear, and camera 31 sees through transparent clipboard 1 and can catch the blackboard writing on presenter and clipboard 1 simultaneously for the presenter still can face the viewer when the blackboard writing, and combine and the viewer is interactive through materials such as blackboard writing, slide, has promoted the interactive effect of online teaching greatly. Meanwhile, the recording device is simple in structure, and the blackboard writing written by the presenter can be normally displayed through the mirror image assembly.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (12)

1. The utility model provides a video shooting recording device, including clipboard (1) and camera (31), clipboard (1) is fixed on frame (2), camera (31) set up the place ahead in clipboard (1), camera (31) are connected with control cabinet (32), control cabinet (32) set up the one side in clipboard (1), a serial communication port, clipboard (1) is transparent, the presenter is located clipboard (1) rear writing, still include the mirror image subassembly, the mirror image subassembly is close to camera (31) and sets up, the demonstration order adjustment that camera (31) captured the clipboard is the writing order of presenter.
2. A video recording arrangement according to claim 1, characterized in that the mirror assembly is a flat mirror, the camera (31) and the writing board (1) being placed on the same side of the mirror surface of the flat mirror, the angle between the flat mirror and the lens plane of the camera (31) being 30 ° to 60 °.
3. A video recording device according to claim 1, characterized in that said mirror assembly camera (31) has built-in mirror components or mirror software built in the computer of the console (32), the lens of the camera (31) being arranged opposite the writing tablet (1).
4. Device according to claim 1, characterized in that said writing board (1) is a transparent plate made of glass or acrylic.
5. The video shooting and recording device according to claim 1, characterized in that the shooting and recording device further comprises a background light source, the background light source comprises a ceiling lamp (6) and a fill-in light (4), the ceiling lamp (6) is arranged behind the presenter, the ceiling lamp (6) is a rear ceiling lamp (6) with a reflector curtain, the fill-in light (4) is arranged close to the writing board (1), and the number of the writing tools and the number of the fill-in light (4) to be turned on are determined according to the color of the reflector curtain.
6. The video shooting and recording device according to claim 5, wherein the light supplement lamps (4) comprise two groups, the two groups of light supplement lamps (4) are oppositely arranged on the left side and the right side of the writing board (1), each group of light supplement lamps (4) comprises a key lamp and an auxiliary lamp, and the key lamp and the auxiliary lamp are respectively arranged in front of and behind the writing board (1).
7. A video recording arrangement as claimed in claim 6, characterized in that when the reflector curtain is white, the writing instrument is a water color pen and the number of light supplement lamps (4) is 0-2 groups on.
8. A video recording arrangement as claimed in claim 6, characterized in that the writing means are highlighters and the fill lights (4) are activated in at least 1 group when the reflector shade is non-white.
9. Video recording device according to claim 8, characterized in that the side walls of said tablet (1) are provided with L ED light strips (8), L ED light strips (8) are white light strips, and L ED light strips (8) are provided at opposite edges of the tablet (1) or at four edges of the tablet (1).
10. Video recording device according to claim 1, characterized in that it further comprises a microphone for amplifying the presenter's voice and an prompter (7), the microphone being connected to the loudspeaker (5), the prompter (7) being arranged on the side of the camera (31).
11. A video shooting and recording method is characterized by mainly comprising the following steps:
setting the placing positions of the writing board (1) and the camera (31) according to the type of the mirror image component;
the video camera (31) is turned on, the demonstrator is located behind the writing board (1) to write the writing board, and the mirror image assembly adjusts the demonstration sequence of the writing board captured by the video camera (31) to the writing sequence of the demonstrator.
12. The captured video recording method according to claim 11, further comprising a light supplement step:
the opening number of the writing tools and the light supplement lamps (4) is determined according to the color of the reflector curtain,
when the color of the reflector curtain is white, writing by using a water color pen, and turning on 0-2 groups of light supplement lamps (4);
when the color of the reflector curtain is non-white, a fluorescent pen is used for writing, and at least 1 group of light supplement lamps (4) and L ED lamp strips (8) are turned on.
CN202010361478.2A 2020-04-30 2020-04-30 Video shooting and recording device and method Pending CN111405219A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010361478.2A CN111405219A (en) 2020-04-30 2020-04-30 Video shooting and recording device and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010361478.2A CN111405219A (en) 2020-04-30 2020-04-30 Video shooting and recording device and method

Publications (1)

Publication Number Publication Date
CN111405219A true CN111405219A (en) 2020-07-10

Family

ID=71429931

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010361478.2A Pending CN111405219A (en) 2020-04-30 2020-04-30 Video shooting and recording device and method

Country Status (1)

Country Link
CN (1) CN111405219A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111787257A (en) * 2020-07-17 2020-10-16 北京字节跳动网络技术有限公司 Video recording method and device, electronic equipment and storage medium
CN114173026A (en) * 2020-09-16 2022-03-11 北京德胜智课教育科技有限公司 Teaching video recording system and teaching video recording method
CN116778121A (en) * 2023-06-29 2023-09-19 南京云视全映科技有限公司 Virtual screen writing control synthesis system and method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111787257A (en) * 2020-07-17 2020-10-16 北京字节跳动网络技术有限公司 Video recording method and device, electronic equipment and storage medium
CN111787257B (en) * 2020-07-17 2021-08-17 北京字节跳动网络技术有限公司 Video recording method and device, electronic equipment and storage medium
CN114173026A (en) * 2020-09-16 2022-03-11 北京德胜智课教育科技有限公司 Teaching video recording system and teaching video recording method
CN116778121A (en) * 2023-06-29 2023-09-19 南京云视全映科技有限公司 Virtual screen writing control synthesis system and method

Similar Documents

Publication Publication Date Title
CN111405219A (en) Video shooting and recording device and method
ATE301299T1 (en) BACK TRANSMISSION SCREEN
WO2010124542A1 (en) Image processing method and device for seamless splice display system
US10523893B2 (en) Method and apparatus for presenting audio and visual information
US20220044580A1 (en) System for recording and producing multimedia presentations
US6082865A (en) Projection type display device with image pickup function and communication system
CN211580083U (en) Video shooting and recording device
US20220406209A1 (en) Advanced Audiovisual Presentation System
CN109130616A (en) A kind of full-scale intelligent display screen blackboard
KR101554574B1 (en) System and Method for Recording Lecture Video Using Transparent Board
KR101593136B1 (en) Led glass board based video lecture system
US20230282186A1 (en) Systems and methods for improved production and presentation of video content
CN108335548A (en) A kind of teaching memory tablet all-in-one machine
CN204926572U (en) System for be used for recording online teaching video
CN1892725A (en) Speech prompting device
CN209843149U (en) Transparent spliced liquid crystal display window
CN210039169U (en) Intelligent sharing blackboard
CN208705862U (en) It can write and project simultaneously the electronic whiteboard of storage
KR200466688Y1 (en) Combined writing board screen
CN115052114B (en) Electronic semitransparent green curtain image matting and lesson recording system
JP3119195U (en) Presentation device for lecture
CN105357476A (en) Video photographing system and method
CN205354417U (en) All -round type wisdom classroom
CN205378088U (en) Video production system
CN217821213U (en) Lighting system applied to electronic semi-transparent green curtain image scratching and course recording system

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination