How to shoot a person in a film and television drama?

In some TV plays, an actor is allowed to play two roles-brother and younger brother, sister and younger sister, father and son, mother and daughter. They can act alone or appear in one shot at the same time. For example, in the TV series "Get Away" broadcast some time ago, Chen Kun played Qiao Zhicai and Qiao Lijie respectively, and appeared face to face many times in one picture. Many people will be curious, how is this picture effect taken?

Generally speaking, if two characters appear in the same picture, of course, they can be replaced by stuntmen. But when the faces of two characters must be seen by the audience at the same time, the real "double act" is needed.

The film stuntman added a board between the camera lens and the photographic film. When shooting, only a part of the film can be exposed because of occlusion. At this time, the actor's A first appeared in the left half of the picture, and the right half was blocked. After filming, put the blocked film back (mark it in advance), then change the mask to the left half and give up the right half to continue filming. At this point, the same actor has changed the shepherd and dressed as B, leaving the camera and background in the same place, just waiting for the director to give the order, calculate the film length and shoot on time.

After these two shots, the picture is complete, and two roles, A and B, appear on the screen at the same time. This kind of "two places at once method" is called "light shielding method".

However, a simple track board cannot make two characters contact each other. If they want to shake hands or hug together, for example, in the TV series "White Night Chasing the Murder", Guan Hongfeng and Guan Hongyu have a side-by-side shot, then more complicated occlusion technology will be adopted. At this time, the blocking plate is not fixed, but will change constantly.

When shooting, one of the characters was replaced by a stuntman, but not all of them, because the face is absolutely irreplaceable. Therefore, the stuntman's head should be covered with a cover, and his head must move when he is close to his shoulders. Therefore, the cover must be changed in a small range, that is, the position of the cover should be moved in one direction, while when shooting a formal actor, other parts should be covered, only the head is exposed. At this time, it is necessary to change the cover and move like last time, so that the actors can move within a predetermined range. The lens synthesized in this way can not only be the same person, but also have a sense of movement and realism in normal life.

Today, when science has entered the era of artificial intelligence, movie stunts are becoming more and more exquisite and magical, and movie stunt experts can confidently claim that we can completely realize any plot and scene on the screen.