Our elementary and middle schools need a lot of classroom recordings, which requires recording audio, video, blackboard and multimedia information of classroom teachers in real time to serve our education and teaching resource construction, resource sharing, teacher evaluation and other services.
First, the recording method of classroom recording
At present, there are many kinds of lesson recording systems, including fully automatic lesson recording system, manual lesson recording system, semi-automatic lesson recording system, fixed and mobile, and portable.
Fully-automatic lesson recording system: It is generally used fixedly. This is because the camera (usually the camera) is used in conjunction with various sensors. It needs to be fixed and adjusted in advance. Try to use it in a professional fixed-use classroom, because it is not manually operated Automatically record lessons, there will be more bad shots during shooting, the original shooting materials will be incomplete, the workload of post-cut editing will be larger, and sometimes there will be important video materials that are not recorded, video shooting framing, The setting is not to mention, the shooting effect generally has a certain gap with manual shooting. The advantage is that it saves manpower when shooting, but it is more time-consuming and laborious in the later stage.
Manual shooting system: Generally, the shooting staff use the camera to switch the teacher to shoot the teacher's lecture class. Generally, this method is used in the shooting of important courses, important meetings, and important activities in general universities or general education departments, qualified primary and secondary schools, etc. The quality of the audio and video captured in this way is high, and has the value of preservation, exchange and evaluation. The disadvantage is that it requires professional shooting and directing staff.
Second, the portable hand-automatic integrated classroom recording method
Portable manual / automatic-hand-automatic integrated lesson recording system: This system combines the advantages of the first two lesson recording systems to shoot good classroom recordings while saving manpower. It is a camera shot using professional image analysis shooting technology Teaching teacher, the shooting of the teacher's walking is automatically tracked, the image tracking is very stable and the teacher does not need to wear any sensor device without any interference of the light; the student speech shooting camera is an image analysis camera that uses the change of the student's image behavior. When the student When the students speak, the camera will automatically shoot, and the students will not need to operate any sensing devices to meet the normal teaching requirements. The most labor-intensive teachers and students will use the image analysis camera to shoot smartly, and the core guide switcher will use Portable all-in-one recording, editing and editing machine, manual switching or intelligent switching automatic recording, etc., so that an ordinary staff can shoot and guide teachers' lectures, student speeches, blackboard writing, multimedia computer courseware, etc. (manual or automatic ), Panoramas caused by faults, etc., through mixing, editing, recording, editing, mixing, switching, recording, subtitles, live broadcasting, publishing, etc., the teacher ’s teaching voice and the audio of the student ’s speech are automatically switched by intelligent, a high-quality classroom recording The audio and video work is complete.
Description of the automatic status of the Kaidi automatic recording system: when the teacher needs to record the class, the teacher only needs to press the start button, and the classroom recording can start automatically (including automatic tracking shooting of the teacher, automatic tracking shooting of the student speech, shooting of the blackboard, shooting of the teacher teaching courseware , The whole process of automatic intelligent guide automatic switching), if you need to pause recording, press the pause button, continue recording, press the continue button, stop recording, press the stop button. During the shooting process, the recorded video can be viewed through the 7-inch high-definition LCD monitor on the teacher's button panel.
In addition, for shooting with high professional requirements, it is necessary to use a professional camera for multi-camera manual shooting. Kaidi Xingye has developed a control system for professional cameras such as Sony or Panasonic, which can remotely control the push, pull, and Pan, tilt, tilt and record, each set of control unit (including PTZ, control and mounting bracket). It solves the problem that the professional multi-camera shooting needs more people.
3. Equipment list and price of portable hand-automatic integrated classroom recording system:
1. Standard definition equipment quotation
Serial number
name
model
Quantity
unit price
(yuan)
Total price
(yuan)
Remarks
1
Teacher tracking camera
KD-GB200BT teacher teaching automatic tracking camera and teacher target locking shooting system
1 set
15500
15500
Normal teaching (no need to wear and operate any objects), moving image shooting is very stable
2
Student tracking camera
KD-FB200BS student speech automatic tracking camera and student behavior analysis target locking shooting system
1 set
16500
16500
Normal teaching (no need to wear and operate any objects), moving image shooting is very stable
3
Blackboard shooting controller
KD-BT100
1 set
1200
Matching
Fully automatic
Close-up shot of blackboard writing
4
Teacher computer courseware shooting controller
KD-CT100
1 set
1200
Matching
Fully automatic
Automatically switch the teacher computer screen
5
Automatic director master controller
KD-A3000C (video automatic intelligent guide control and audio automatic control machine including mixer)
1
8500
Matching
Fully automatic
Can control 10 microphones, 2 stereo inputs
6
Auto class recording panel
KD-ZD700LK automatic lecture recording panel with 7-inch HD LCD screen display (start, pause, continue, stop)
1
950
Matching
Required for fully automatic lesson recording
7
Kaidi portable recording, recording and editing machine
KD-LCC900XD-S
1 set
148000
148000 yuan
Educational special model, six-channel high-standard-definition mixed knitting machine (see technical characteristics for details)
8
wireless microphone
BG-6100U (Lizhi section lapel + handheld)
1 set
2550
2550
Teacher recording
9
Recording microphone
HT-68 recording microphone
+ Mounting frame
6 sets
850
5100
Large-diaphragm recording microphone for recording student speech
10
Video camera
KD-E90, (18 times optical for conference camera) + tripod
1 set
5500
5500
Multi-camera shooting, used for panoramic shooting, lens replenishment, panorama caused by fault
11
Campus live broadcast, on-demand interview system
Kaidi campus live broadcast, on-demand interview system V1.0
1 set
20000
20000
Campus Network Application Platform
12
Mobile tripod
Automatic camera tripod (2.5 meters for students, 2 meters for teachers)
2 sets
400
800
Mobile shooting use
12
Cable
Video cable, control cable, power cable, microphone cable, VGA cable, crossover, etc.
1 set
2800
2800
Meet fixed and mobile use
13
Camera box
Camera flight case
1
600
600
Meet mobile requirements
14
Tripod box
Tripod flight case
1
700
700
Meet mobile requirements
15
total
218050 yuan
2. HD equipment offer
Serial number
name
model
Quantity
unit price
(yuan)
Total price
(yuan)
Remarks
1
Teacher tracking camera
KD-GB2000HT HD teacher teaching automatic tracking camera and teacher target locking shooting system HD-SDI
1 set
25000
25000
Normal teaching (no need to wear and operate any objects), moving image shooting is very stable
2
Student tracking camera
KD-FB2000HS high-definition student speech automatic tracking camera and student behavior analysis target locking shooting system HD-SDI
1 set
27500
27500
Normal teaching (no need to wear and operate any objects), moving image shooting is very stable
3
Blackboard shooting controller
KD-BT100
1 set
1200
Matching
Fully automatic
Close-up shot of blackboard writing
4
Teacher computer courseware shooting controller
KD-CT100
1 set
1200
Matching
Fully automatic
Automatically switch the teacher computer screen
5
Automatic director master controller
KD-A3000C (video automatic intelligent guide control and audio automatic control machine including mixer)
1
8500
Matching
Fully automatic
Can control 10 microphones, 2 stereo inputs
6
Auto class recording panel
KD-ZD700LK automatic lecture recording panel with 7-inch HD LCD screen display (start, pause, continue, stop)
1
950
Matching
Required for fully automatic lesson recording
7
Kaidi portable recording, recording and editing machine
KD-LCC900XH-4S
Input AV × 4, VGA × 4, DVI × 4, HD / SD-SDI × 4, all interfaces can be mixed at random
1 set
148000
148000 yuan
High-definition educational model four-channel high-definition integrated machine (see technical characteristics for details)
8
wireless microphone
BG-6100U (Lizhi section lapel + handheld)
1 set
2550
2550
Teacher recording
9
Recording microphone
HT-68 large diaphragm recording microphone
+ Mounting frame
6 sets
850
5100
Large-diaphragm recording microphone for recording student speech
10
Video camera
KD-2000HD, (high definition HD-SDI conference camera 12 times optical) + tripod
1 set
12500
12500
Multi-camera shooting, used for panoramic shooting, lens replenishment, panoramic view caused by malfunction, etc.
11
Campus live broadcast, on-demand interview system
Kaidi campus live broadcast, on-demand interview system V1.0
1 set
20000
20000
Campus Network Application Platform
12
Mobile tripod
Automatic camera tripod (2.5 meters for students, 2 meters for teachers)
2 sets
400
800
Mobile shooting use
13
Cable
Video cable, control cable, power cable, microphone cable, VGA cable, crossover, etc.
1 set
2800
2800
Meet fixed and mobile use
14
Camera box
Camera flight case
1
600
600
Meet mobile requirements
15
Tripod box
Tripod flight case
1
700
700
Meet mobile requirements
16
total
245550 yuan
Fourth, the main equipment technical parameters and selection:
1. Teachers' automatic tracking camera and teacher's target locking shooting system: SD KD-GB200BT, HD KD-GB2000HT;
(1) Product description
Dual camera integrated design. The analysis lens, shooting lens and embedded high-speed DSP digital image processing system are integrated in the dome camera, with compact structure and beautiful and compact appearance. It is different from the method of analyzing the lens and shooting the lens separately and using a computer or control host and software to achieve image tracking. Identify the location of the teacher through image analysis, and automatically track and shoot the close-up picture of the teacher. It has the advantages of simplicity, reliability, convenience and good stability. Image recognition tracking requirements:
(1) Teachers can achieve the purpose of automatic tracking without wearing any sensors. The tracking process is very stable and is not affected by light, and the projection screen does not affect the tracking effect. .
(2) A variety of teacher tracking modes. When multiple people are on the podium, the system can choose to track the previous teacher, or automatically switch to the middle scene, the students and teachers on the podium can be photographed. When the teacher walks off the stage, he can continue to track and shoot. When the student walks off the stage, the camera stops tracking the student and automatically turns to the teacher to track.
(3) With automatic zoom function. It can automatically adjust the magnification of the camera according to the distance of the target.
(4) The tracking sensitivity is adjustable. The teacher can move the camera in a small range without triggering the camera to rotate, which satisfies the viewing comfort requirements of different viewers.
(5) It is very convenient to install and use. Installation and commissioning is very simple, no image acquisition card is required. Just fix the camera on the wall or tripod,
Various settings and debugging can be done through the computer serial port or keyboard, and no peripheral equipment is required during use.
(2) Technical parameters:
Standard definition KD-GB200BT parameters: 1/4 inch SONY EX-view HAD CCD image sensor, composite video VBS output, BNC interface; minimum illumination 0.7lux, 480 lines, F1.4, f = 4.1 ～ 73.8mm, 18x optical zoom , 12 times digital zoom, wide angle range, horizontal, automatic white balance and backlight compensation. Rotation angle range, horizontal 360 ° continuous, vertical -10 ° ～ 90 °; rotation speed, horizontal 0.05 ° ～ 240 ° / S), vertical (0.03 ° ～ 160 ° / S); tracking accuracy 0.05 °.
HD KD-GB2000HT parameters: 2 million pixels, 10x optics, 12x digital zoom, automatic white balance and backlight compensation. Component interface (Y / Pb / Pr), composite video VBS output. Output formats 1080 / 59.94i, 1080/5 0i, 720 / 59.94p, 720 / 50p. Rotation angle range, horizontal 360 ° continuous, vertical -10 ° ～ 90 °; rotation speed, horizontal 0.05 ° ～ 240 ° / S, vertical 0.03 ° ～ 160 ° / S; tracking accuracy 0.05 °.
Agreement: PELCO_P, PELCO_D, VISCA,
Baud rate:
1200, 2400, 4800, 9600, 19200bps,
Power supply: 12VDC
(3) Shooting characteristics:
(1) The tracking target is automatically locked, and the tracking process is not affected by the ambient light source;
(2) The tracking and shielding area can be set by oneself, one tracking area and multiple shielding areas can be set;
(3) The center of the image can be adjusted by itself during tracking, the horizontal tracking speed can be adjusted by itself, and the vertical tracking speed can be adjusted by itself;
(4) The target loss time can be set; after the target is lost, the action can be returned to the preset point to maintain the original position;
(5) With automatic zoom function, it can automatically adjust the magnification of the camera according to the distance of the target;
(6) The tracking process is very stable, and there is no obvious shaking of the video;
(7) The camera has a backlight compensation function, and the entire picture can be seen clearly in a strong light background environment;
(8) Close-up function of blackboard writing, when the teacher walks into the blackboard writing area, the camera can shoot the teacher's blackboard writing clearly and stably according to the preset lens stretching size and height;
2. Students speak automatically and track the camera and analyze the behavior of the students. The target locking shooting system: standard definition KD-FB200BS, high-definition KD-FB2000HS;
(1) Product description
Dual camera integrated design. The analysis lens, shooting lens and embedded high-speed DSP digital image processing system are integrated in the dome camera, with compact structure and beautiful and compact appearance. It is different from the method of analyzing the lens and shooting the lens separately and using a computer or control host and software to achieve image tracking. Identify the student's location through image analysis and automatically take a close-up shot of the student. It has the advantages of simplicity, reliability, convenience and good stability. Image recognition tracking and positioning requirements:
(1) Students do not need to wear any sensors to achieve automatic recognition, tracking, positioning, and close-up shooting.
(2) High recognition accuracy. Using advanced machine vision and image recognition technology, the recognition rate exceeds 90% and is not affected by light.
(3) Wide recognition area and object. The use of one camera can identify students in the entire standard classroom, which can realize the identification and positioning of students of different heights to meet the requirements of students in large, middle and primary schools.
(4) With automatic zoom function, it can automatically adjust the camera magnification according to the distance of the target.
(5) Complete normalization. When the student stands up and speaks, the close-up picture of the student can be taken without any operation by the student, and the normalized teaching is completely realized.
(6) It is very convenient to install and use. Installation and commissioning are very simple, no image acquisition card is required, and no preset position for each student is required. Only need to fix the camera on the wall or tripod, through the computer serial port or keyboard can be various settings and debugging, no need to participate in any peripherals during use.
(2) Technical parameters:
Standard definition KD-FB200BS parameters: 1/4 inch SONY EX-view HAD CCD image sensor, composite video VBS output, BNC interface; minimum illumination 0.7lux, 480 lines, F1.4, f = 4.1 ～ 73.8mm, 18x optical zoom , 12 times digital zoom, wide angle range, horizontal, automatic white balance and backlight compensation. Rotation angle range, horizontal 360 ° continuous, vertical -10 ° ～ 90 °; rotation speed, horizontal 0.05 ° ～ 240 ° / S, vertical 0.03 ° ～ 160 ° / S; positioning accuracy 0.1 °.
HD KD-FB2000HS parameters: 2 million pixels, 10x optics, 12x digital zoom, automatic white balance and backlight compensation. Component interface (Y / Pb / Pr), composite video VBS output. Output formats 1080 / 59.94i, 1080/5 0i, 720 / 59.94p, 720 / 50p. Rotation angle range, horizontal 360 ° continuous, vertical -10 ° ～ 90 °; rotation speed, horizontal 0.05 ° ～ 240 ° / S, vertical 0.03 ° ～ 160 ° / S; positioning accuracy 0.1 °.
Agreement: PELCO_P, PELCO_D, VISCA,
Baud rate:
1200, 2400, 4800, 9600, 19200bps,
Power supply: 12VDC
(3) Shooting characteristics:
(1) With automatic zoom function, it can automatically adjust the magnification of the camera according to the distance of the target;
(2) Multiple targets can be recognized at the same time. When only one student stands up to speak, the camera closes it up. When multiple students stand up to speak, it returns to the panorama;
(3) Not limited by the size and form of the classroom, large classrooms and ladder classrooms can also be tracked normally;
(4) The tracking process is very stable, and there is no obvious shaking of the video;
(5) The camera has a backlight compensation function, and the entire picture can be seen clearly in a strong light background environment;
(6) The answer delay of the student can be set, and the student will automatically pull back to the panorama after standing overtime;
(7) The average height and sensitivity of the students can be set to meet the height requirements of each grade;
3. The blackboard shooting controller: KD-BT100;
Cooperate with the teacher's automatic tracking camera and teacher's target-locking shooting system. When the teacher writes the blackboard, the close-up control of the blackboard is enabled for close-up shooting of the blackboard (the camera can be adjusted according to the height of the teacher's writing)
4. Teacher computer courseware shooting controller: KD-CT100;
With the use of the teacher's teaching computer, when the teacher opens the teaching courseware with the mouse, the operation process will be recorded and wirelessly transmitted to the automatic guidance control host, which automatically controls the acquisition, broadcasting, recording and editing machine to switch the teacher's computer screen. Tune) There is no record of manipulation, and it automatically switches to the teacher lecture screen.
5. Automatic guidance master control system, namely: video automatic intelligent guidance control and audio automatic control machine system: KD-A3000C;
Kaidi automatic pilot main control system has two working states, manual state and automatic state. There are buttons on the Kaidi automatic guidance control system to choose between these two states. Manual state: You can control the gimbal and camera by pushing, pulling, panning, tilting, and tilting through the gimbal control function on the all-in-one recording and editing machine, and switch the guide according to the teaching progress and screen conditions.
In the automatic state: the teacher tracking camera can automatically track the teacher on the podium. The automatic intelligent guide first switches the current teacher's teaching screen. When the student stands up to speak, the student tracking camera recognizes the student's behavior of standing up to shoot the student's speech. The automatic intelligent guide host control system receives the behavior signal of the student standing up and speaks, and switches the image of the student's speech to the anchor picture. When the speech is completed, the signal of the completion of the speech is transmitted to the automatic guidance host. The automatic guidance host controls the integrated recording, recording and editing machine to switch back to the original teacher teaching picture. During the course recording, if no sensor is triggered, the teacher picture is recorded. When the teacher writes a blackboard, the sensor in front of the blackboard will be triggered, and the teacher tracking camera will automatically close the blackboard. If the teacher walks out of the tracking range, or the teacher tracking camera malfunctions, the screen switches to the classroom panoramic camera. If the student tracking camera detects that a student is standing, answer the question. The student tracking camera will automatically give the student a close-up, and the recorded picture will be switched to the close-up of the student. When the student sat down after answering the question, the screen switched back to the teacher. If the teacher operates the computer with the mouse, the mouse will send a signal to the switching control unit to switch the recorded picture to the computer signal. After the teacher stops operating the computer for 10 seconds, the recording screen is switched back to the teacher screen. The sound collection is also automatically controlled. When the teacher teaches the lecture, the recording microphone in the student area is automatically turned off. When the student speaks, the teacher ’s microphone is also automatically turned off to maximize protection. Recording quality.
KD-A3000C automatic guide master control system-audio part
Audio collection part:
Teacher's Lavalier Wireless Microphone:
Mount a professional recording microphone above the student area (the pickup distance is adjusted according to the classroom and student height):
When the lens is switched to the teacher, the teacher's head-mounted wireless microphone is turned on, and when the lens is switched to the student's close-up, the microphone at the front of the student is turned on to minimize noise.
Automatic audio switcher parameters:
10 microphone inputs; 2 line inputs
2 main outputs; 1 auxiliary output
Monitor function
Total harmonic distortion: <0.2%
Inherent noise: -120dBV (150Ω sound source through 400Hz-20KHz bandpass)
Frequency response: 20Hz-20kHz
Phantom power: 48V
Power supply voltage: AC 220V ± 10%, 50 / 60Hz, 100mA,
Operating temperature range: 0 ° to 60 ℃
Storage temperature range: -30 ° to 70 ℃
Dimensions: 483 × 245 × 52mm
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