CN115052114A - Electronic semi-transparent green curtain image matting and lesson recording system and method - Google Patents
Electronic semi-transparent green curtain image matting and lesson recording system and method Download PDFInfo
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- CN115052114A CN115052114A CN202210966841.2A CN202210966841A CN115052114A CN 115052114 A CN115052114 A CN 115052114A CN 202210966841 A CN202210966841 A CN 202210966841A CN 115052114 A CN115052114 A CN 115052114A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/262—Studio 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
- H04N5/265—Mixing
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/40—Information retrieval; Database structures therefor; File system structures therefor of multimedia data, e.g. slideshows comprising image and additional audio data
- G06F16/43—Querying
- G06F16/438—Presentation of query results
- G06F16/4387—Presentation of query results by the use of playlists
- G06F16/4393—Multimedia presentations, e.g. slide shows, multimedia albums
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input 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
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04162—Control or interface arrangements specially adapted for digitisers for exchanging data with external devices, e.g. smart pens, via the digitiser sensing hardware
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- G—PHYSICS
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- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, 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
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- G—PHYSICS
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- G06F3/00—Input 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
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction 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
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- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction 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
- G06F3/0488—Interaction 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
- G06F3/04883—Interaction 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
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- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B5/00—Electrically-operated educational appliances
- G09B5/06—Electrically-operated educational appliances with both visual and audible presentation of the material to be studied
- G09B5/065—Combinations of audio and video presentations, e.g. videotapes, videodiscs, television systems
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- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/10527—Audio or video recording; Data buffering arrangements
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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 picture and a teacher picture and save the PPT demonstration picture and the teacher picture as a video file through a camera picture synthesizer and an electronic green curtain synthesizer; the electronic green screen synthesizer receives a PPT picture signal from a PPT display computer, generates a semitransparent green screen in the electronic green screen synthesizer, and covers the semitransparent green screen on the PPT picture to form a new green screen synthesis picture with the 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 screen image matting and lesson recording system and method effectively solve the problem that the content is completely blocked by a physical green screen, so that a teacher cannot see PPT; 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
Technical Field
The invention belongs to the technical field of graphic synthesis, and particularly relates to an electronic semi-transparent green curtain image matting and lesson recording system and method.
Background
With the further development of internet education, network recorded broadcast 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 that: 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 the tolerance of the photosensitive element of the camera is not ideal, the current course content is not suitable for appearing bright colors, such as white, and the white is easy to be overexposed. This limits the presentation of the curriculum content.
Furthermore, if the composition, output, display monitoring and saving of the PPT content picture and the lecturer picture as a video file are generally realized by a signal picture composition, wherein the lesson content is a synthesized PPT screen native picture signal, wherein a green matting technique must be employed in order to synthesize the lecturer picture onto 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 semi-transparent green curtain image matting and course recording system and method, which aim to solve the problems in the background technology.
According to the first aspect of the technical scheme, the invention provides an electronic semitransparent green curtain image matting and lesson recording system, which realizes the synthesis, output, display and monitoring of a PPT demonstration picture and a teacher picture and saves the PPT demonstration picture and the teacher picture as a video file through a camera picture synthesizer and an electronic green curtain synthesizer; the electronic green screen synthesizer receives a PPT picture signal from a PPT display computer, generates a semitransparent green screen in the electronic green screen synthesizer, and covers the semitransparent green screen on the PPT picture to form a new green screen synthesis picture with the 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, and the lecturer can see the PPT picture through the semitransparent green screen by human eyes; the student sees the lecture content of the lecturer on the liquid crystal display large screen through the remote network.
Further, the electronic semitransparent green screen image matting and lesson recording system comprises a recording and broadcasting control system for on-line teaching recording and broadcasting control; the recording and broadcasting control system is connected with a lecture PPT control system for performing PPT course explanation control, is connected with a camera shooting and receiving system for recording teaching audio, and is connected with a light system for performing light supplement in a video recording 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.
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 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 a PPT picture, and an infrared touch frame for operation and identification of a 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 sound signal collection, a sound signal receiver for sound signal reception, and a camera for video recording.
Preferably, a tripod is mounted 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 synthesis 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.
According to a second aspect of the technical solution of the present invention, the present invention provides an electronic semitransparent green curtain image matting and lesson recording method, which comprises the following steps: a signal picture acquisition step S1, a signal picture adjustment step S2, a signal picture synthesis step S3, and a signal synthesis result output step S4;
a signal picture acquisition step S1, wherein the camera acquires the speaker image sound picture and transmits the picture to the camera picture 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 picture synthesizer is accessed into the signal of the camera, the setting of the camera 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 picture are adjusted, and the color key matting of the camera 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 the 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 the electronic green screen synthesizer synthesizes the green screen picture signal and outputs the green screen picture signal to a liquid crystal display large screen through a synthesizer cable for a lecturer lecture blackboard book PPT.
Compared with the prior art, the electronic semitransparent green curtain image matting and course recording system and the method have the following technical effects and advantages:
1. the translucent green curtain of electron is scratched and is recorded class system benefits from recorded broadcast control system and lecture PPT control system and the setting of radio system of making a video recording, can accomplish the scratch to the video recording, and because lecturer's eyes permeable translucent green curtain, so can see the PPT picture that has green curtain layer that shows on the clear liquid crystal display large screen, effectively solved the green curtain of physics and blocked content completely and lead to the condition that the lecturer can not see the PPT to appear.
2. Electronic semi-transparent green curtain image matting and lesson recording system puts in the PPT picture to the liquid crystal display large screen through PPT show computer cooperation PPT computer monitor, the green curtain layer of rethread electronic green curtain synthesizer production, and set up opaque coverage, so that the green curtain layer covers on the PPT picture, then make the picture synthesizer of making a video recording insert when obtaining portrait picture and PPT picture, for image matting effect through setting up the portrait picture, make green curtain part become transparent, thereby cover the PPT picture with other transparent pictures except that portrait, can realize through the cooperation infrared touch frame, can make things convenient for the teacher to carry out writing of writing 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 an electronic translucent green curtain image matting and lesson recording system according to 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 of 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 a camera image synthesis of the electronic semitransparent green curtain image matting lesson recording method.
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 recording system, which is a network teaching platform picture synthesis technology, and the electronic semitransparent green curtain image matting and recording system realizes synthesis, output and display monitoring of a PPT demonstration picture and a lecturer picture through a camera picture synthesizer and an electronic green curtain synthesizer and stores the PPT demonstration picture and the lecturer picture as a video file. Specifically, the electronic green screen synthesizer receives the PPT picture signal, generates a translucent green screen inside the electronic green screen synthesizer, and covers the translucent green screen on the PPT picture to form a new green screen synthesized picture with the translucent green screen loaded by the PPT picture. The green screen synthesized picture is output to a liquid crystal display large screen behind the lecturer through the electronic green screen synthesizer, and the lecturer can see the PPT picture through the semitransparent green screen by human eyes; the student can see the content of the lecture of the lecturer on the liquid crystal display large screen through the remote network. The invention not only solves the problems of color distortion and lens distortion elimination in the prior art, but also can realize clear shooting of course PPT content. Therefore, the problems that the content is completely blocked by the physical green screen, the lecturer cannot see PPT and cannot write on the board are solved.
As shown in fig. 1 and fig. 2, an electronic translucent green screen image matting and lesson recording system comprises a recording and broadcasting control system 1 for on-line teaching recording and broadcasting control, wherein 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 comprises 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 PPT display computer 103 for PPT opening and putting in, the PPT display computer 103 is connected with an electronic green screen synthesizer 104, and the electronic green screen synthesizer 104 is used for generating a green screen layer covering a PPT picture, when the electronic green screen synthesizer 104 obtains access to the PPT picture, a green screen layer is added inside the PPT picture, and an opaque coverage of 70% -95% is set, and then the green screen layer is covered on the PPT picture, so as to facilitate drawing in a later stage.
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 physical green screen completely blocks the content, so that the instructor cannot see the PPT, the camera shooting and sound receiving system 3 includes a sound signal transmitter 301 for collecting sound signals, a sound signal receiver 302 for receiving sound signals, and a camera 303 for recording videos, a tripod 304 is installed at the bottom of the camera 303, and the camera 303 is connected with a camera shooting picture synthesizing system 6 for synthesizing camera shooting pictures, the camera shooting picture synthesizing system 6 includes a camera shooting picture synthesizer 601 for synthesizing the PPT picture and shooting audio, when the camera shooting picture synthesizer 601 is accessed while obtaining the human picture and the PPT picture, the human picture is set as a matting effect, so that the green screen becomes partially transparent, and through tolerance setting, the translucent green screen is identified as completely green, so that the green screen region becomes completely transparent, the transparent pictures except for the human images are covered on the PPT, so that the matting of the video can be completed, and the human eyes and the shooting picture synthesizer 601 form purposeful filtering pictures based on different adjusting mechanisms of the human eyes and the shooting picture synthesizer 601 to obtain respective required contents. As shown in fig. 8, when the instructor sees a transparent green PPT signal, the transparent green is filtered out, and the instructor can write on the PPT to give a lecture. 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 screen picture, and a matting is arranged in a green screen area to form a transparent effect; wherein the green screen can be provided with an opaque coverage of 70-95%. If the green screen is covered by 100%, the human eyes cannot penetrate through the semitransparent green screen to see the PPT, and if the coverage of the green screen is below 70%, after the camera 303 shoots signals, software cannot well remove PPT pictures under the semitransparent green screen, so that the image matting effect is poor. Therefore, it is appropriate to set 70% -95% of the coverage of the green screen, so that 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 because 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 the adjusting function of brightness and color temperature, by arranging the movable slide rail 401, the LED adjustable photographing lamps 402 can adjust the position in front and back and left and right directions, so as to conveniently adjust the light supplement angle, which is more flexible and applicable than the LED adjustable photographing lamps 402 with fixed position, the movable slide rail 401 is two groups, each group is provided with a wang-shaped rail, two i-shaped rails, the wang-shaped rail is connected with the i-shaped rail through pulleys, the i-shaped rail is fixed on the ceiling, the "i" shaped area above the wang-shaped rail is connected with the fixed i-shaped rail through pulleys, the pulley slides left and right, and drives the king-shaped rail to slide left and right when sliding, and the LED adjustable photography lamp 402 below slides 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 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 a sound of a lecturer, the portrait image and the sound are transmitted into a camera 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 camera image synthesizer 601, after the camera image synthesizer 601 is accessed with signals, the color, the image size, the image direction and the image position of the camera image synthesizer 601 can be adjusted by matching a recording control computer 101 with a recording computer monitor 102, the transparency and the color key image matting can be adjusted, after the electronic green screen synthesizer 104 is accessed into a PPT image, a color layer is formed in the PPT image, 70-95% opaque coverage degree is set so that the green screen layer covers the PPT image, the semitransparent green layer and the PPT image layer are synthesized into a video image by the PPT display computer 103, the image picture is set to be the image matting effect through the image shooting picture synthesizer 601, the green curtain part becomes transparent, and through tolerance setting, the semitransparent green curtain is identified to be completely green, and the green curtain area is completely transparent. 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 through making a video recording picture synthesizer 601 synthesis, export to the lecturer in front of the lecturer and observe and use on the final synthetic picture monitor 603, supply the lecturer to supervise 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 and duplicate a final lecture picture and export video storage server 602 simultaneously, by recording control computer 101 control picture synthesizer 601 of making a video recording, set up the route of storage file, the form etc., preserve operations such as video file, realize recording the harmless of internet education video, be convenient for the lecturer to carry out the explanation of PPT and writing of blackboard-writing, and realization that can be quick is to the sectional drawing of recording video.
In another embodiment, in order to obtain a final composite picture, the camera shooting picture synthesizer receives picture input shot by the camera, the camera shooting picture synthesizer is set to be a matting effect, and other areas of the picture shot by the camera except the instructor body are transparent; and after receiving 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 synthesis result outputting step S4.
A signal picture acquisition step S1, wherein the camera acquires the speaker image sound picture and transmits the picture to the camera picture synthesizer; the PPT display computer obtains a PPT picture (or a 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 picture synthesizer is accessed into the signal of the camera, the setting of the camera 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 picture are adjusted, and the color key matting of the camera 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, the semitransparent green curtain is identified to be completely green through tolerance setting, and then the green curtain region is completely transparent; such a transparent picture in addition to the 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 the 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 the electronic green screen synthesizer synthesizes the green screen picture signal and outputs the green screen picture signal to a liquid crystal display large screen through a synthesizer cable for a lecturer lecture blackboard 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 image synthesizer copies a final lecture image, outputs the final lecture image to a video file storage server through a synthesizer cable, and controls the synthesizer through a recording control computer, sets the path, format and the like of a stored file, stores the video file and other operations.
Further, the electronic semi-transparent green curtain image matting and course recording method adopts the following electronic semi-transparent green curtain image matting and course recording system, and the electronic semi-transparent green curtain image matting and course recording system comprises a camera shooting and radio receiving system, a liquid crystal display large screen and touch synchronization system, a lecture PPT system, a recording and broadcasting control system and a camera shooting and 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 liquid crystal display large screen and touch synchronization system, an infrared touch frame is arranged at the edge of a picture of the liquid crystal display large screen, and an infrared signal network is formed on the surface of the whole liquid crystal display large screen. The touch signal is connected with a PPT display computer through a control line, and the PPT display computer obtains a touch scribing signal or a writing signal and synthesizes the touch scribing signal or the writing signal to a PPT demonstration interface to finally display 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 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 in a synthesis mode.
In the recording and broadcasting control system, a recording and broadcasting 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 is provided with a recording and broadcasting control computer monitor for facilitating the monitoring operation. The recording and playing control computer controls the green screen layer configuration of the electronic green screen synthesizer, synthesizes a green screen picture and outputs the green screen picture to the liquid crystal display large screen, controls the portrait layer matting configuration of the shooting picture synthesizer, synthesizes a final picture and outputs the final picture 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 management computer of the whole system and is the only operation entrance for managing the operation of the whole system.
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 bodies of the lecturers are transparent, the signals after matting are covered on the PPT picture signals, the two signals are combined into one picture through the image pickup picture combiner, and the picture is output to the video storage server through the cable, so that the video file is a complete combined picture and is stored as a file in the storage server.
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 (10)
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, generates a semitransparent green screen in the electronic green screen synthesizer, and covers the semitransparent green screen on the PPT picture to form a new green screen synthesis picture with the 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, and the lecturer can see the PPT picture through the semitransparent green screen by human eyes; the student sees the lecture content of the lecturer on the liquid crystal display large screen through the remote network.
2. The electronic translucent green curtain image matting and lesson recording system according to claim 1, wherein: 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, the 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 sound 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.
3. The electronic translucent green curtain image matting and lesson recording system according to claim 1, wherein: 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.
4. The electronic translucent green curtain image matting and lesson recording system according to claim 3, wherein: 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.
5. The electronic translucent green curtain image matting and lesson recording system according to claim 2, wherein: the PPT page-turning signal emitter 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.
6. The electronic translucent green curtain image matting and lesson recording system as claimed in claim 3, wherein: the large screen and touch synchronization system comprises a liquid crystal display large screen for PPT picture display, and an infrared touch frame for teacher operation identification is fixedly installed on one side or the periphery of the liquid crystal display large screen.
7. The electronic translucent green curtain image matting and lesson recording system according to claim 1, 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 or information can be displayed on a liquid crystal display large screen in real time.
8. The electronic translucent green curtain image matting and lesson recording system according to claim 5, 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.
9. The electronic translucent green curtain image matting and lesson recording system according to claim 6, 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 synthesized picture monitor used for facilitating a lecturer to monitor the recorded picture in real time.
10. An electronic semitransparent green curtain image matting and course recording method is characterized by comprising the following steps: which comprises the following steps: a signal picture acquisition step S1, a signal picture adjustment step S2, a signal picture synthesis step S3, and a signal synthesis result output step S4;
a signal picture acquisition step S1, wherein the camera acquires the speaker image sound picture and transmits the picture to the camera picture 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 picture synthesizer is accessed into the signal of the camera, the setting of the camera 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 picture are adjusted, and the color key matting of the camera 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 the 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 the electronic green screen synthesizer synthesizes the green screen picture signal and outputs the green screen picture signal to a liquid crystal display large screen through a synthesizer cable for a lecturer lecture blackboard book PPT.
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