One of the most important functions of monitoring equipment is to monitor whether the large screen projection is normal, and the main purpose is not to monitor the audience. The shape of the screen determines the shape of the audience hall, especially the new form of film.
Different varieties have different shapes of screens, the screen size of large-field movies determines the height ratio of the audience hall, the screen of ring-screen movies determines that the audience hall must be round, and the screen of dome movies needs a dome-shaped audience hall and so on.
The quality standards of cinemas are divided into four grades: special, A, B and C (combined with extra large, large, medium and small). The main requirements are determined according to the specific situation. The corresponding requirements of Party A, Party B and Party C shall meet the following requirements:
1. Durability of main structure: Grade A is greater than 100 years, Grade B is 50 ~ 100 years, and Grade C is 25 ~ 50 years.
2. Fire resistance rating: Grade A and Grade B shall not be lower than Grade II; Class c can't be lower than class III, and there can't be an oversized one.
There are cameras in the cinema, and almost every corner is equipped with infrared night vision cameras, which are still 360 degrees without dead ends. Camera or webcam is a kind of video input equipment, which belongs to a kind of closed-circuit television and is widely used in video conferencing, telemedicine, real-time monitoring and other fields.
Cameras generally have the basic functions of video shooting, transmission and still image capture. After the image is captured by the lens, the image is processed by the photosensitive element circuit and control element in the camera and converted into a digital signal that can be recognized by the computer. Then it is input into the computer through the parallel port and USB connection, and then the image is restored by software, thus forming a picture.
Cameras can be divided into digital cameras and analog cameras. Digital cameras can convert analog video signals generated by video acquisition equipment into digital signals, and then store them in computers. The video signal captured by analog camera must be converted into digital mode by special video acquisition card and compressed before it can be converted into computer.