How do movie stunts look like movies?

The method of shooting the image projected on the screen and the actor's performance in front of the screen one by one is called screen synthesis. Including background projection process and front projection process. In modern times, the more commonly used stunts are movable mask photography and optical technology printing. With the development of electronic technology, television technology and computer technology, new methods related to movie stunts emerge one after another. Electronic blue screen method. It uses electronic control method to combine the foreground actor image and the background image in one picture at the same time. It consists of a servo control system consisting of a foreground camera car and a background camera mechanism. The actor performed in front of the blue screen. When shooting, the foreground camera car carries out various mobile shooting, and the controlled background camera moves the shooting background according to a certain proportion. The images taken by two cameras are synthesized into one image by electronic synthesis mechanism, and recorded on magnetic tape by video recorder. This method solves the problems of foreground (mainly people) contour widening and motion shooting that often appear in motion mask method, and can also make people move in the model. This signal recorded on magnetic tape can be transcribed into film and become an optical image. Electronic analog photography. It uses a program to control the camera to move and shoot. Shooting is carried out in two stages. In the first stage, the camera shoots the actor's performance scene in front of the blue screen, and at the same time converts all kinds of movements in the actual shooting process of the camera into analog quantities, which are calculated and stored by the computer; The negative film taken for the first time is processed by blue screen method to obtain positive and negative masks. The second stage is shooting the background. Extract the signals stored in the computer according to a certain proportion, simulate the motion form of the first shooting, and shoot the background repeatedly according to the proportion. After synthesis, a synthesis diagram is obtained. Digital stunt method. Digital stunt pictures can be divided into two types. One is linear graphics, that is, single-line geometric graphics screen; One is scanning graphics, that is, scanned image graphics with tones. The first one is often used in cartoons, and the second one is often used in feature films. The production method is as follows: according to the shooting requirements, the computer calculates and compiles the program; After automatic check and correction, the recorded picture is shot by a video recorder according to the program, and then the tape signal is transcribed to the film to form an optical image.

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