CN115052114B - Electronic semitransparent green curtain image matting and lesson recording system - Google Patents

Electronic semitransparent green curtain image matting and lesson recording system Download PDF

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Publication number
CN115052114B
CN115052114B CN202210966841.2A CN202210966841A CN115052114B CN 115052114 B CN115052114 B CN 115052114B CN 202210966841 A CN202210966841 A CN 202210966841A CN 115052114 B CN115052114 B CN 115052114B
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picture
ppt
green
synthesizer
electronic
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CN115052114A (en
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栾建莛
张晓龙
丁贵
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Beijing Youah Network Education Technology Co ltd
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Beijing Youah Network Education Technology Co ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/222Studio circuitry; Studio devices; Studio equipment
    • H04N5/262Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects
    • H04N5/265Mixing
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F16/00Information retrieval; Database structures therefor; File system structures therefor
    • G06F16/40Information retrieval; Database structures therefor; File system structures therefor of multimedia data, e.g. slideshows comprising image and additional audio data
    • G06F16/43Querying
    • G06F16/438Presentation of query results
    • G06F16/4387Presentation of query results by the use of playlists
    • G06F16/4393Multimedia presentations, e.g. slide shows, multimedia albums
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416Control or interface arrangements specially adapted for digitisers
    • G06F3/04162Control or interface arrangements specially adapted for digitisers for exchanging data with external devices, e.g. smart pens, via the digitiser sensing hardware
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0487Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0487Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
    • G06F3/0488Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
    • G06F3/04883Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures for inputting data by handwriting, e.g. gesture or text
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/1423Digital output to display device ; Cooperation and interconnection of the display device with other functional units controlling a plurality of local displays, e.g. CRT and flat panel display
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/14Digital output to display device ; Cooperation and interconnection of the display device with other functional units
    • G06F3/147Digital output to display device ; Cooperation and interconnection of the display device with other functional units using display panels
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B5/00Electrically-operated educational appliances
    • G09B5/06Electrically-operated educational appliances with both visual and audible presentation of the material to be studied
    • G09B5/065Combinations of audio and video presentations, e.g. videotapes, videodiscs, television systems
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10Digital recording or reproducing
    • G11B20/10527Audio or video recording; Data buffering arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00Details of television systems
    • H04N5/76Television signal recording
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10Digital recording or reproducing
    • G11B20/10527Audio or video recording; Data buffering arrangements
    • G11B2020/10537Audio or video recording

Abstract

The invention discloses an electronic semitransparent green curtain image matting and lesson recording system and a method, which belong to the technical field of graphic synthesis, and realize the synthesis, output, display and monitoring of a PPT demonstration image and a lecturer image and save the PPT demonstration image and the lecturer image as a video file through a camera image synthesizer and an electronic green curtain synthesizer; the electronic green screen synthesizer receives a PPT picture signal from a PPT display computer, a semitransparent green screen is generated inside the electronic green screen synthesizer, and the semitransparent green screen is covered on a PPT picture to form a green screen synthesis picture with a new PPT picture loaded with the semitransparent green screen; the green screen synthesized picture is output to a liquid crystal display large screen behind the lecturer through the electronic green screen synthesizer for displaying. The electronic semitransparent green curtain image matting and lesson recording system and the method effectively solve the problem that a teacher cannot see PPT because the physical green curtain completely blocks the content; the electronic semitransparent green curtain image matting and recording system can be used for a teacher to monitor and record images in real time, and the teacher can conveniently adjust and record behaviors.

Description

Electronic semitransparent green curtain image matting and lesson recording system
Technical Field
The invention belongs to the technical field of graphic display, and particularly relates to an electronic semitransparent green curtain image matting and lesson recording system.
Background
With the further development of internet education, network recording and broadcasting courses become mainstream products for new times of learning. In the network recording course, a video camera is generally adopted to record a teaching scene of writing or calculation performed by a teacher on a blackboard or a white board in a classroom, and then the teaching scene is transmitted to a remote student end for the students to watch and study. Due to the requirement of recording courses, the requirement of large-capacity teaching cannot be met on a blackboard or a white board in the same classroom.
The applicant provides a novel teaching scene recording application, namely, a camera is adopted to directly shoot an electronic display screen (a computer screen used by a teacher or a display curtain of a lecture curtain) for recording courses in a classroom in a teaching scene so as to form a recording file for remote teaching. In a subsequent application, the applicant found: the remote teaching mode has the following defects: when a camera photographs a display screen, color distortion and lens distortion often exist, so that the color of a picture in a course PPT (or displayed on an electronic display screen after shooting) is changed, even cannot be seen clearly, and a form line is bent and distorted. And because of the reason that the tolerance of the photosensitive element of the camera is not ideal, the current course content is generally not suitable for appearing bright colors, such as white, and the white is easy to be over exposed. This limits the presentation of the curriculum content.
In another implementation scenario, the signal picture synthesizer is used to synthesize, output, display and monitor the PPT content picture and the instructor picture, and store the PPT content picture and the instructor picture as a video file, wherein the course content is a synthesized PPT screen native picture signal, and a green matting technique is necessary to synthesize the instructor picture into the PPT picture signal. However, under the state of green screen image matting, the back of the instructor is a piece of green cloth instead of an electronic blackboard, so that the instructor does not have a screen to display the course content, and the instructor cannot write on the blackboard after the instructor is. The course can not be written on a blackboard, and the teaching effect is not achieved.
Disclosure of Invention
Based on the problems in the prior art, the invention provides an electronic semitransparent green curtain image matting and lesson recording system to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: an electronic semitransparent green curtain image matting and lesson recording system comprises a recording and broadcasting control system for on-line teaching recording and broadcasting control; the recorded broadcast control system is connected with a lecture PPT control system used for conducting PPT course explanation control, is connected with a camera shooting and receiving system used for teaching audio recording, and is connected with a light system used for conducting video recording environment light supplement.
The recording and broadcasting control system comprises a recording control computer for recording control, the recording control computer is connected with a recording computer monitor for displaying recording control information, and the recording computer monitor is connected with a PPT display computer for opening and releasing PPT.
Furthermore, the PPT display computer is connected with an electronic green screen synthesizer, and the electronic green screen synthesizer is used for generating a green screen layer covering the PPT picture.
Preferably, the lecture PPT control system comprises a PPT page-turning signal transmitter for transmitting a page-turning signal, a PPT page-turning signal receiver for receiving the page-turning signal, and a PPT computer monitor for displaying PPT information in a PPT display computer.
Preferably, the PPT page-turning signal transmitter and the PPT page-turning signal receiver are commonly connected to a PPT computer monitor, and the PPT computer monitor is connected to a large screen and touch synchronization system for synchronizing the display screen and the touch screen.
Preferably, the large screen and touch synchronization system comprises a liquid crystal display large screen for displaying the PPT picture, and an infrared touch frame for operation and identification of the lecturer is fixedly installed around one side of the liquid crystal display large screen.
Preferably, the camera radio system comprises a sound signal emitter for collecting sound signals, a sound signal receiver for receiving sound signals, and a camera for recording videos.
Preferably, the tripod is installed at the bottom of the camera, and the camera is connected with a camera shooting picture synthesis system for camera shooting picture synthesis.
Preferably, the camera shooting picture synthesizing system comprises a camera shooting picture synthesizer used for synthesizing the PPT picture and the shooting audio, the camera shooting picture synthesizer is connected with a video storage server used for synthesizing picture storage, and the video storage server is connected with a final synthesized picture monitor used for facilitating a lecturer to monitor the recorded picture in real time.
Preferably, the lighting system comprises a movable slide rail, and an LED adjustable photography lamp for environment light supplement is movably arranged on the movable slide rail.
Compared with the prior art, the electronic semitransparent green curtain image matting and lesson recording system has the following technical effects and advantages that:
1. electronic semitransparent green curtain image matting and recording system benefits from the setting of a recording and broadcasting control system, a lecture PPT control system and a camera shooting and receiving system, can finish image matting on a recorded video, and can see a PPT picture with a green curtain layer displayed on a large screen through semitransparent green human eyes of a teacher, thereby effectively solving the problem that the situation that the teacher cannot see the PPT due to the fact that the physical green curtain completely blocks the content
2. The electronic semi-transparent green curtain image matting and lesson recording system puts PPT pictures into a liquid crystal display large screen through a PPT display computer matched with a PPT computer monitor, then produces green curtain layers through an electronic green curtain synthesizer, sets opaque coverage so as to enable the green curtain layers to cover the PPT pictures, enables the image pickup picture synthesizer to obtain simultaneous access of portrait pictures and the PPT pictures, enables the green curtain parts to be transparent by setting the portrait pictures as image matting effects, and accordingly covers transparent pictures except the portrait on the PPT pictures, and can realize that by matching with an infrared touch frame, a teacher can conveniently write board books on the liquid crystal display large screen;
3. the translucent green curtain of electron is scratched and is recorded class system, benefit from the setting of radio system and the picture of making a video recording synthesis system of making a video recording, picture and sound when the camera through sound signal transmitter, sound signal receiver and installation tripod talkbacks class are recorded, and synthesize final lecture picture through the picture synthesizer of making a video recording, in with final lecture picture output to the lecturer observation in front of the lecturer with final synthesis picture monitor, supply the lecturer to monitor in real time and record the picture, make things convenient for the lecturer to adjust and record the action.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
FIG. 2 is a schematic block diagram of a recording and playing control system according to the present invention;
FIG. 3 is a schematic block diagram of a lecture PPT control system according to the present invention;
FIG. 4 is a schematic block diagram of a camera radio system of the present invention;
FIG. 5 is a schematic block diagram of a lighting system of the present invention;
FIG. 6 is a schematic block diagram of a large screen and touch synchronization system of the present invention;
FIG. 7 is a schematic block diagram of a camera image compositing system of the present invention;
fig. 8 is a schematic diagram of image pickup screen composition.
In the figure: 1. a recording and broadcasting control system; 101. a recording control computer; 102. recording a computer monitor; 103. PPT display computer; 104. an electronic green screen synthesizer; 2. a lecture PPT control system; 201. a PPT page turning signal transmitter; 202. a PPT page-turning signal receiver; 203. a PPT computer monitor; 3. a camera shooting and radio receiving system; 301. an acoustic signal emitter; 302. a sound signal receiver; 303. a camera; 304. a tripod; 4. a lighting system; 401. moving the slide rail; 402. an LED adjustable photography lamp; 5. a large screen and touch synchronization system; 501. a large liquid crystal display screen; 502. an infrared touch frame; 6. a camera picture composition system; 601. a camera shooting picture synthesizer; 602. a video storage server; 603. the instructor observes the final composite screen monitor.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The application provides an electronic semitransparent green curtain image matting and lesson recording system, which is a network teaching platform picture synthesis technology and eliminates color distortion and lens distortion by adopting a mode of shooting and picture synthesis for multiple times. The method mainly adopts the steps of synthesizing lecturer pictures into PPT screen native picture signals and then synthesizing the PPT screen native picture signals into course videos. The lecturer pictures are synthesized into PPT screen native picture signals, and a green matting technology and the electronic semitransparent green screen matting and lesson recording system are adopted. The invention not only solves the problems in the prior art, but also can clearly shoot the course PPT content.
As shown in fig. 1 and fig. 2, an electronic semitransparent green screen image matting and lesson recording system includes a recording and broadcasting control system 1 for on-line teaching recording and broadcasting control, the recording and broadcasting control system 1 is connected with a lecture PPT control system 2 for PPT (slide or presentation) course explanation control, the recording and broadcasting control system 1 is connected with a camera radio system 3 for teaching audio recording, the recording and broadcasting control system 1 is connected with a lighting system 4 for light supplement of a video environment, the recording and broadcasting control system 1 includes a recording control computer 101 for recording control, the recording control computer 101 is connected with a recording computer monitor 102 for displaying recording control information, the recording computer monitor 102 is connected with a display computer 103 for PPT opening and delivering, the PPT display computer 103 is connected with an electronic green screen synthesizer 104, the electronic green screen synthesizer 104 is used for generating a green screen layer covering a PPT picture, and when the electronic green screen synthesizer 104 obtains access of the PPT picture, a green screen layer is newly added inside the electronic green screen synthesizer and 70-95% of the PPT screen synthesizer is set up, and the green screen synthesizer 104 covers the later stage of the PPT screen picture.
As shown in fig. 2 and 3, to facilitate the lecturer to page the PPT picture, specifically, the lecture PPT control system 2 includes a PPT page-turning signal transmitter 201 for transmitting a page-turning signal, a PPT page-turning signal receiver 202 for receiving the page-turning signal, and a PPT computer monitor 203 for displaying the PPT information in the PPT display computer 103, where the PPT page-turning signal transmitter 201 and the PPT page-turning signal receiver 202 are commonly connected to the PPT computer monitor 203, the PPT computer monitor 203 is connected to the large screen and the touch synchronization system 5 for synchronizing the display screen and the touch screen, and the lecturer can transmit the page-turning signal to the PPT page-turning signal receiver 202 by operating the PPT page-turning signal transmitter 201, so as to drive the PPT display computer 103 to page the PPT picture through the PPT page-turning signal receiver 202.
As shown in fig. 3 and 6, for making things convenient for the lecturer to write on the liquid crystal display large screen 501, the large screen and the touch synchronization system 5 include the liquid crystal display large screen 501 that is used for the display of the PPT picture, the infrared touch frame 502 that the lecturer operates the discernment is fixedly installed around the liquid crystal display large screen 501 one side, can make things convenient for the lecturer to write on the liquid crystal display large screen 501 on the blackboard through infrared touch frame 502.
As shown in fig. 1, 4, 6, and 7, in order to solve the problem that the content is completely blocked by a physical green screen and the instructor cannot see the PPT, the camera pickup and reception system 3 includes a sound signal transmitter 301 for sound signal acquisition, a sound signal receiver 302 for sound signal reception, and a camera 303 for video recording, a tripod 304 is installed at the bottom of the camera 303, and the camera 303 is connected with a camera pickup picture synthesis system 6 for camera pickup picture synthesis, the camera pickup picture synthesis system 6 includes a camera pickup picture synthesizer 601 for synthesizing the PPT picture and the shooting audio, when the camera pickup picture synthesizer 601 obtains simultaneous access of the human picture and the PPT picture, the human picture is set as a matting effect, so that the green screen becomes partially transparent, the translucent green screen is identified as completely green by tolerance setting, so that the green screen area becomes completely transparent, such a transparent picture except the human picture is overlaid on the PPT picture, and based on different adjustment mechanisms of the human eye and the camera pickup picture synthesizer 601, the filtering content of the human eye synthesizer 601 is formed, so as to obtain the respective desired filtering content of the human eye. When the teacher sees the transparent green PPT signal, the transparent green is filtered out, and the teacher can write on the PPT to teach. The camera 303 shoots a transparent green PPT signal and transmits the signal to the picture-taking synthesizer 601, the picture-taking synthesizer 601 filters out the PPT by setting tolerance to form a complete green picture, and a matting is arranged in a green curtain area to form a transparent effect; wherein the green curtain can be provided with an opaque coverage of 70-95%. If the green screen is covered by 100%, human eyes cannot penetrate through transparent green to see the PPT, and if the green screen coverage is less than 70%, after the camera 303 shoots signals, software cannot well remove PPT pictures under the transparent green, so that the image matting effect is poor. Therefore, the setting of 70% -95% of the coverage of the green screen is appropriate, so that the eyes of the lecturer can see the PPT picture with the green screen layer displayed on the large liquid crystal display screen 501 clearly through the semitransparent green screen, and the problem that the lecturer cannot see the PPT due to the fact that the content is completely blocked by the physical green screen is effectively solved.
As shown in fig. 4 and 7, a picture is recorded for the real-time supervision of the lecturer, and a recording behavior is convenient for the adjustment of the lecturer, the image pickup synthesizer 601 is connected to the video storage server 602 for synthesizing the picture for storage, the video storage server 602 is connected to the final image synthesis monitor 603 for the observation of the lecturer, which is used for the real-time supervision of the lecturer to record the picture, the picture and the sound during the lecture of the lecturer are recorded by the sound signal transmitter 301, the sound signal receiver 302 and the camera 303 with the tripod 304, and the final lecture picture is synthesized by the image pickup synthesizer 601, so that the final lecture picture is output to the final image synthesis monitor 603 for the observation of the lecturer in front, so that the lecturer can supervise the recording picture in real-time, and the adjustment of the lecturer can be convenient for the recording behavior.
As shown in fig. 1 and 5, in order to conveniently adjust the photographing angle of the LED adjustable photographing lamp 402 to meet various photographing requirements, the lighting system 4 includes a movable slide rail 401, the movable slide rail 401 is movably provided with four LED adjustable photographing lamps 402 for light supplement of the environment, and the four LED adjustable photographing lamps 402 have adjusting functions of brightness and color temperature, by arranging the movable slide rail 401, the LED adjustable photographing lamps 402 can adjust positions front, back, left and right, and adjust light supplement angles conveniently, which is more flexible and applicable than the LED adjustable photographing lamps 402 with fixed positions, the movable slide rails 401 are two groups, each group is provided with a wang-shaped rail, two i-shaped rails are connected with the i-shaped rails through pulleys, the i-shaped rails are fixed on a ceiling, the i-shaped regions above the wang-shaped rails are connected with the fixed i-shaped rails through pulleys, the pulleys slide left and right, and the lower adjustable LED photographing lamps 402 slide left and right. The adjustable photography luminaire 402 of LED of below passes through pulley connection king's word track the above "worker" word region, and the adjustable photography luminaire 402 of LED can slide around king's word track below, and four adjustable photography luminaires 402 of LED can both change the position all around like this, conveniently adjust photographic angle, are fit for various shooting demands.
The working principle of the electronic semitransparent green curtain image matting and course recording system is as follows: when the electronic semitransparent green screen image matting and class recording system is used, a camera 303 provided with a tripod 304 is matched with a sound signal transmitter 301 and a sound signal receiver 302 to obtain a portrait image and sound of a lecturer, the portrait image and the sound are transmitted into a shooting image synthesizer 601, a PPT image is obtained by a PPT display computer 103 and transmitted into an electronic green screen synthesizer 104 and the shooting image synthesizer 601, after the shooting image synthesizer 601 is connected with signals, the color, the image size, the image direction and the image position of the shooting image synthesizer 601 can be adjusted by matching a recording control computer 101 with a recording computer monitor 102, the transparency and color key matting can be adjusted, after the electronic green screen synthesizer 104 is connected into a PPT image, a color layer is formed in the PPT image, 70-95% of opaque coverage degree is set, so that the green screen layer covers the PPT image, the semitransparent green screen layer and the PPT image layer are synthesized into a video image signal by the shooting image synthesizer 601, the portrait image is set as a matting effect, the green screen is partially transparent, and the green screen image is completely recognized into a semitransparent green screen region by setting tolerance. The transparent pictures except the portrait are covered on the PPT, so that the transparent pictures except the portrait and the PPT picture are combined into a video picture signal, and the green screen picture combined by the PPT display computer 103 is output to a liquid crystal large screen for a lecturer to teach the blackboard writing PPT. And the final lecture picture of making a video recording through making a video recording picture synthesizer 601 is synthetic, export the lecturer in the front of the lecturer and observe with final composite picture monitor 603, supply the lecturer to watch in real time and record the picture, make things convenient for the lecturer to adjust and record the action, make a video recording picture synthesizer 601 copies a final lecture picture and export video storage server 602 simultaneously, control picture synthesizer 601 that makes a video recording by recording control computer 101, set up the route of storage file, the format etc., operations such as save video file, realize recording the hindrance-free of internet education video, the lecturer of being convenient for carries out the explanation of PPT and the writing of blackboard writing, and realization that can be quick is to the sectional drawing of recording video.
In another embodiment, the electronic semi-transparent green screen image matting and lesson recording system realizes the synthesis, output, display and monitoring of the PPT demonstration picture and the instructor picture through the camera picture synthesizer and the electronic green screen synthesizer and stores the PPT demonstration picture and the instructor picture as a video file. Specifically, the electronic green screen synthesizer receives the PPT picture signal, generates a semitransparent green screen inside the electronic green screen synthesizer, and covers the semitransparent green screen on the PPT picture to form a new green screen synthesized picture with the semitransparent green screen loaded on the PPT picture. The green curtain synthesized picture is output to the electronic large screen display behind the lecturer through the electronic green curtain synthesizer, and the lecturer can see the PPT picture through the semitransparent green curtain, so that the problems that the content is completely blocked by the physical green curtain, the lecturer cannot see the PPT, and the board writing cannot be performed are solved.
In addition, in order to obtain a final composite picture, a camera shooting picture synthesizer receives picture input shot by a camera, a matting effect is set in the camera shooting picture synthesizer, and other areas of the picture shot by the camera are transparent except the instructor body; and after receiving the input of the PPT picture, synthesizing the scratched lecturer picture into the PPT picture, and finally synthesizing into a complete lecture video.
More specifically, the electronic semitransparent green curtain image matting and course recording method comprises the following steps: a signal picture acquiring step S1, a signal picture adjusting step S2, a signal picture synthesizing step S3 and a signal synthesizing result outputting step S4.
A signal picture acquisition step S1, wherein a camera acquires a speaker image sound picture and transmits the speaker image sound picture to a camera image synthesizer; the PPT display computer obtains a PPT picture (or PPT playing demonstration picture) and transmits the PPT picture to the electronic green screen synthesizer, and the PPT display computer simultaneously transmits the PPT picture to the camera picture synthesizer.
A signal picture adjusting step S2, after the camera shooting picture synthesizer is accessed into the signal of the camera, the setting of the camera shooting picture synthesizer is controlled through a recording and broadcasting computer control line, the color, the size direction, the position and the transparency of the camera shooting picture are adjusted, and the color key matting of the camera shooting picture is adjusted, so that a portrait picture is obtained; after the electronic green screen synthesizer obtains access of a PPT picture, a green screen layer is additionally arranged in the electronic green screen synthesizer, 70% -95% of opaque coverage is set, and the green screen layer covers the PPT picture. After the image shooting picture synthesizer obtains simultaneous access of a portrait picture and a PPT picture, the portrait picture is set to be a keying effect, the green curtain layer is partially transparent, translucent green is identified to be completely green through tolerance setting, and then the green curtain region is completely transparent; such a transparent picture other than a portrait is overlaid onto the PPT picture.
A signal picture synthesizing step S3, synthesizing the semi-transparent green screen layer picture and the PPT picture signal into a video picture signal by an electronic green screen synthesizer; the camera shooting picture synthesizer synthesizes the transparent picture except the portrait and the PPT picture into a video picture signal, namely a green picture signal.
And a signal synthesis result output step S4, wherein after the electronic green screen synthesizer synthesizes a green screen picture signal, the green screen picture signal is output to a liquid crystal display large screen through a synthesizer cable for a lecturer to use a tablet book PPT. In addition, the final lecture picture synthesized by the camera shooting picture synthesizer is output to a final synthesized picture monitor for the lecturer to observe in front of the lecturer through a synthesizer cable, so that the lecturer can monitor the recorded picture in real time, and the lecturer can conveniently adjust the recording behavior. And meanwhile, the camera shooting picture synthesizer copies a final lecture picture, outputs the final lecture picture to a video file storage server through a synthesizer cable, and controls the synthesizer by a recording control computer, sets a path, a format and the like of a stored file, and stores the video file and the like.
Further, the electronic semitransparent green screen image matting and lesson recording system comprises a camera shooting and sound receiving system, an electronic large screen and touch synchronization system, a lecture PPT system, a recording and broadcasting control system and a camera shooting picture synthesis system.
In the radio system of making a video recording, the camera obtains the lecturer picture through the shooting, and the lecturer wears sound signal transmitter, sends out sound signal through signal transmitter during the lecture and is received by sound signal receiver, and signal transmitter lug connection camera forms the integrative signal of sound picture in camera inside, transmits the picture synthesizer of making a video recording through the cable, supplies the synthesizer to call.
In the electronic large screen and touch synchronous system, the infrared touch frame is arranged at the edge of a picture of the liquid crystal display large screen, and meanwhile, an infrared signal net is formed on the surface of the whole liquid crystal display large screen, when the hands or pens of a teacher contact the surface of the liquid crystal panel, the infrared signal net is blocked, and the blocking signal is a touch signal, which means that the teacher needs to mark or write at the position. The touch signal is linked with a PPT display computer through a control line, and the PPT display computer is synthesized to a PPT demonstration interface after obtaining a touch scribing or writing signal and finally displayed as a PPT picture with a board for writing. The PPT demonstration picture of the PPT demonstration computer is output to the electronic green screen synthesizer through a cable for the synthesizer to call. After the synthesizer calls the PPT picture, a transparent green screen layer is added on the upper layer and synthesized into a picture, and the picture is output to the liquid crystal display large screen through a cable for display, so that the green screen effect is achieved on the large screen.
In the lecture PPT system, a lecturer holds a PPT page turning signal transmitter in hand, and operates PPT page turning during lecture, wherein a page turning signal is obtained by a PPT page turning signal receiver connected to a PPT display computer. The PPT page turning signal is transmitted to the PPT display computer, and the PPT display computer obtains the page turning signal of the instructor and performs page turning; in addition, the touch signal is transmitted to the PPT display computer through the infrared touch frame. The PPT display computer can be turned over and written, so that a PPT picture which can be turned over and written can be displayed on a PPT display computer monitor for effect preview. The picture of the PPT display computer is transmitted to the electronic green screen synthesizer through a cable, and simultaneously, one picture is copied and transmitted to the camera picture synthesizer. The two synthesizers call PPT pictures and are used synthetically.
In the recorded broadcast control system, a recorded broadcast control computer is respectively connected with an electronic green screen synthesizer, a camera shooting picture synthesizer and a video storage server through three control lines, and the recorded broadcast control computer is provided with a recorded broadcast control computer monitor for facilitating monitoring operation. The recording and broadcasting control computer controls the green screen layer configuration of the electronic green screen synthesizer, synthesizes green screen pictures and outputs the green screen pictures to the liquid crystal display large screen, controls the portrait layer sectional configuration of the shooting picture synthesizer, synthesizes final pictures and outputs the final pictures to the video storage server. The video file storage path, format and the like of the video storage server are also controlled and set by the recording and playing control computer. The recording and broadcasting control computer is the total configuration and total management computer of the whole system, is the only operation entrance for managing the operation of the whole system and is the core function.
The green curtain layer may be provided with an opaque coverage of 70-95%. If set up to 100% and cover green curtain, then people's eye will can't pass transparent green and see PPT, if set up the green curtain coverage below 70%, behind the camera shooting signal, can't fine get rid of the PPT picture under the transparent green curtain layer, and the effect of scratching is not good. It is therefore appropriate to provide a green curtain layer with an opaque coverage of 70% -95%. As shown in fig. 8.
In the electrified education era, a liquid crystal display large screen is arranged in a classroom and used as a blackboard, and the liquid crystal display large screen is mainly used for writing on a blackboard and demonstrating PPT. Through the green curtain synthesizer of the electron that increases this patent, can make the big screen of liquid crystal display who originally uses as the blackboard keep the basis of original function, increased green curtain function. The problem of traditional green curtain shelter from blackboard content completely, mr can't write the blackboard book is solved.
In the camera shooting picture synthesis system, a camera shooting picture synthesizer obtains picture sound signals shot by a camera and obtains PPT signals transmitted by a PPT display computer at the same time; the shot picture signals are provided with a non-matting effect, the regions except the body of the instructor are transparent, the signals after matting are covered on the PPT picture signals, the two signals are combined into a picture through a camera picture combiner, and the picture is output to a video storage server through a cable, so that the video file is a complete combined picture and is stored as a file in the storage server.
Furthermore, the electronic semi-transparent green curtain image matting and lesson recording system further comprises a lighting system, and an LED adjustable photographic lamp in the lighting system has the functions of adjusting the brightness and the color temperature; in addition, the photographic lamp is adjusted by the aid of the movable sliding rails, so that the position of the photographic lamp can be adjusted front and back, left and right, the light supplementing angle is adjusted conveniently, and the device is more flexible and applicable than a lamp with a fixed position. The movable sliding rails in the lighting system are two groups, each group is provided with a prince rail and two I-shaped rails, and the prince rail and the I-shaped rails are connected through pulleys. The I-shaped rail is fixed on the ceiling, and the I-shaped rail is fixedly connected with the I-shaped area on the prince rail through a pulley. The pulley slides left and right, the sliding drives the prince track to slide left and right, and the lower photography lamp slides left and right. The lower photography lamp is connected with the I-shaped area on the upper part of the prince track through a pulley, and the photography lamp can slide back and forth under the prince track. The positions of the four photographic lamps can be changed front and back, left and right, the photographic angle can be adjusted conveniently, and the multifunctional camera is suitable for various shooting requirements.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (6)

1. The utility model provides a translucent green curtain of electron is scratched and is liked in a lesson system which characterized in that: the electronic semitransparent green curtain image matting and lesson recording system realizes the synthesis, output, display and monitoring of a PPT demonstration picture and a teacher picture through a camera picture synthesizer and an electronic green curtain synthesizer and stores the PPT demonstration picture and the teacher picture as a video file; the electronic green screen synthesizer receives a PPT picture signal from a PPT display computer, a semitransparent green screen is generated inside the electronic green screen synthesizer, and the semitransparent green screen is covered on a PPT picture to form a green screen synthesis picture with a new PPT picture loaded with the semitransparent green screen; the green screen synthesized picture is output to a liquid crystal display large screen behind the lecturer through the electronic green screen synthesizer for displaying, and the lecturer can see the PPT picture through the semitransparent green screen by human eyes; the student sees the lecture content of the teacher on the liquid crystal display large screen through the remote network;
when the image shooting picture synthesizer obtains simultaneous access of a human image picture and a PPT picture, the human image picture is set to be a keying effect, a green curtain part is changed into transparent, translucent green is identified into complete green through tolerance setting, and a green curtain area is completely changed into transparent, so that the transparent picture except the human image covers the PPT, the keying of the video can be completed, and based on different adjusting mechanisms of human eyes and the image shooting picture synthesizer, purposeful filtering pictures of the human eyes and the image shooting picture synthesizer are formed to obtain respective required contents;
the electronic semi-transparent green-curtain image matting and recording system comprises an image matting and broadcasting control system for on-line teaching image matting and broadcasting control, wherein the image matting and broadcasting control system is connected with a lecture PPT control system for PPT course explanation control, the image matting and broadcasting control system is connected with an image pickup and reception system for teaching audio recording, and the image matting and broadcasting control system is connected with a light system for light supplement of a video environment; the recording and broadcasting control system comprises a recording control computer for recording control, the recording control computer is connected with a recording computer monitor for displaying recording control information, and the recording computer monitor is connected with a PPT display computer for opening and releasing PPT; the PPT display computer is connected with an electronic green screen synthesizer, and the electronic green screen synthesizer is used for generating a green screen layer covering the PPT picture; after the electronic green screen synthesizer obtains access of a PPT picture, a green screen layer is additionally arranged in the electronic green screen synthesizer, the opaque coverage degree is set to be 70% -95%, and then the green screen layer is covered on the PPT picture;
the lecture PPT control system comprises a PPT page turning signal transmitter for transmitting a page turning signal, a PPT page turning signal receiver for receiving the page turning signal and a PPT computer monitor for displaying PPT information in a PPT display computer; the lecturer operates the PPT page turning signal transmitter to send a page turning signal to the PPT page turning signal receiver so as to drive the PPT display computer to turn pages of the PPT picture through the PPT page turning signal receiver;
the PPT page-turning signal transmitter and the PPT page-turning signal receiver are connected to a PPT computer monitor together, the PPT computer monitor is connected with a large screen and a touch synchronization system for displaying graphic and text information, the large screen and the touch synchronization system have a touch function, and the graphic and text information can be controlled to be zoomed or displayed in a newly-built window through touch operation on the large screen and the touch synchronization system;
the lighting system comprises a movable slide rail, wherein four LED adjustable photographic lamps for environment light supplement are movably arranged on the movable slide rail, the number of the LED adjustable photographic lamps is four, the four LED adjustable photographic lamps are provided with the brightness and color temperature adjusting functions, the positions of the LED adjustable photographic lamps can be adjusted front and back, left and right by arranging the movable slide rail, the movable slide rails are divided into two groups, each group is provided with a Chinese character 'wang' rail and two I-shaped rails, the Chinese character 'wang' rail and the I-shaped rails are connected through pulleys, the I-shaped rails are fixed on a ceiling, the Chinese character 'wang' rails are connected with the fixed I-shaped rails through pulleys in an I-shaped area, the pulleys slide left and right, the Chinese character 'wang' rails are driven to slide left and right during sliding, and the LED adjustable photographic lamps below slide left and right; the LED adjustable photography lamps on the lower portion are connected with an I-shaped area on the upper portion of the king-shaped track through pulleys, the LED adjustable photography lamps slide back and forth below the king-shaped track, and the positions of the four LED adjustable photography lamps can be changed front and back, left and right.
2. The electronic translucent green curtain image matting and lesson recording system according to claim 1, wherein: the large screen and touch synchronization system comprises a liquid crystal display large screen used for displaying PPT pictures, and an infrared touch frame for operation identification of a lecturer is fixedly installed on one side or the periphery of the liquid crystal display large screen.
3. The electronic translucent green curtain image matting and lesson recording system according to claim 2, wherein: the camera shooting and radio receiving system comprises a sound signal emitter for collecting sound signals, a sound signal receiver for receiving the sound signals and a video camera for recording videos, and shot information can be displayed on a liquid crystal display large screen in real time.
4. The electronic translucent green curtain image matting and lesson recording system according to claim 3, wherein: the bottom of the camera is provided with a tripod, and the camera is connected with a camera shooting picture synthesis system for synthesizing camera shooting pictures.
5. The electronic translucent green curtain image matting and lesson recording system as claimed in claim 3, wherein: the camera shooting picture synthesis system comprises a camera shooting picture synthesizer used for synthesizing a PPT picture and shooting audio, the camera shooting picture synthesizer is connected with a video storage server used for synthesizing picture storage, and the video storage server is connected with a final synthesis picture monitor used for facilitating a teacher to monitor the recorded picture in real time.
6. An electronic semitransparent green curtain image matting and course recording method is characterized by comprising the following steps: using an electronic translucent green screen image matting and recording system as claimed in any one of the preceding claims 1-5; which comprises the following steps: a signal picture acquiring step S1, a signal picture adjusting step S2, a signal picture synthesizing step S3 and a signal synthesis result outputting step S4;
a signal picture acquisition step S1, wherein a camera acquires a speaker image sound picture and transmits the speaker image sound picture to a camera image synthesizer; the PPT display computer obtains a PPT picture and transmits the PPT picture to the electronic green screen synthesizer, and simultaneously transmits the PPT picture to the camera picture synthesizer;
a signal picture adjusting step S2, after the camera shooting picture synthesizer is accessed into the signal of the camera, the setting of the camera shooting picture synthesizer is controlled through a recording and broadcasting computer control line, the color, the size direction, the position and the transparency of the camera shooting picture are adjusted, and the color key keying of the camera shooting picture is adjusted, so that a portrait picture is obtained; after the electronic green screen synthesizer obtains access of a PPT picture, a green screen layer is additionally arranged in the electronic green screen synthesizer, and the green screen layer covers the PPT picture;
a signal picture synthesizing step S3, synthesizing the semi-transparent green screen layer picture and the PPT picture signal into a video picture signal by an electronic green screen synthesizer; the camera shooting picture synthesizer synthesizes the transparent picture except the portrait and the PPT picture into a video picture signal, namely a green picture signal;
and a signal synthesis result output step S4, wherein after the electronic green screen synthesizer synthesizes a green screen image signal, the green screen image signal is output to a liquid crystal display large screen through a synthesizer cable for a lecturer to teach a blackboard-writing PPT.
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