Application of lighting system in virtual studio

General idea of ​​lighting system design in virtual studio

In general, virtual studios have multiple cameras to shoot. Through this feature, in order to prevent the edges from being shot at every angle to prevent the occurrence of sharp edges or blue edges, the blue box must be very soft. It is especially important to note that for the surface of the blue box and the ground, it is important to note that after the screen is displayed, there is uniform illumination on the scene floor and the blue box background. And whenever the host is sitting and hosting the show, pay special attention to the fact that when the light is projected on the host or the host's entire face, the lights must be even and soft. Once the light is uneven, there will be a bend that illuminates the host's legs, and the clothes are not illuminated or there are no lights in some places to see through. Therefore, the lighting of the virtual studio must be a comprehensive and uniform lighting method, in order to find the most ideal picture, the host will also appear true in this scene.

The technique of the virtual studio image is to use the color key machine to eliminate the blue color. Therefore, it is necessary to pay attention to the removal of the blue while observing the blue, that is, it must have the concept of stereoscopic light layout. The lamp layout is arranged in front, and the blue box is arranged behind. The light emitted by the three basic colors of light is very broad. After the lighting layout of the host, it is necessary to illuminate a certain light on the blue box. Therefore, after the front scenery illuminance meets the demand, the blue box must be filled with a certain range to meet the blue requirement. The brighter blue box can make the front corner of the host more bright, and eliminate the blue light with the blue-removing button in the color picker, which causes the host's corner to appear blacker, and can use a small amount of side for the host. Light to make up.

Specific requirements for lighting system design in virtual studio

Use of face light requirements

In the virtual studio, when designing the lighting, it is generally necessary to make the lighting layout low and flat, so that the initial projection of the host's body can be minimized or disappeared. This is because when the blue box is used to reflect the light to the shadow part, after further adjustment by computer software, the blue elimination device on the color key can remove these shadows, thus affecting the screen. The effect of the host screen that appears. In reality, for the use of such lights, it is best not to add the main light source in the virtual studio. The reason for this is that if the use of these light sources is not good, it will easily lead to logical errors in the projection background, which will appear in reality. The phenomenon that the light source and the virtual light source do not match.

Use of backlighting requirements

In the general studio, the requirement for lighting layout is that the backlight is stronger than the main light. The purpose of this is to make the outer corner of the host have a more prominent effect, which can enhance the stereoscopic effect of the host. But in virtual studios, strict control of backlighting is necessary. Once the backlight is too strong, it will make the blue box floor look very white, so that the blue and the background color do not match the same (light ratio problem), so the effect of calculating the blue is not very good.

Use metering requirements

In reality, when lighting a virtual studio, be sure to add metering. Because the color keyer in the virtual operating system uses the blue elimination device, because the blue box reflection light will be applied to the host body or the corners of the clothes, the blue color next to it will turn black. Therefore, it is necessary to strengthen the metering to make the blue part of the host or the corners of the clothes further surrender, so that the effect of the host's clothes corners can be delicate after the image is displayed, which can add real effects.

Requirements for using scattered light

Be sure to pay attention to the reflected light of the host's clothes. At the same time, the refracted light for the transparent props will also affect the blue box. Once the blue box surface shows a highlight, it should be adjusted immediately. On the other hand, when the screen of the highlight part is connected to the screen, the background will display a illusory picture, which will greatly reduce the overall effect.

Requirements for using white balance

After summing up in the real world experience, because in the virtual studio, the light reflected by the blue box will have a certain impact on the white balance. If the white balance is not adjusted, it will cause the host's edge to lose its true effect, thus affecting the overall effect.

Precautions for lighting systems in practical applications

1) Under the blue background, not only the relevant equipment for hanging the lights at the roof, but also the equipment related to the lights along the ground and wall panels. In the blue light, you should pay attention to the uniformity of the light, which is more conducive to the display of the picture, giving a sense of reality.

2) In the virtual studio, the interaction between realistic lighting and virtual lighting is critical. Use a computer for lighting control and control the light source at any time. In the perfect state, all changes in the light can be verified by the computer in real life, and the virtual lighting changes. The reverse is also true. This is very important for the realism of the light.

3) In the virtual studio, the most important point to pay attention to when using the lighting system is the problem of shadows. How to effectively use the shadows becomes a problem. For example, the scene in front of the camera mainly refers to the host. When the host is standing in the virtual scene, if it is not behind, it will look very fake and have no real effect. If there are too many shadows, it will make the virtual studio look very dark. Therefore, the shadow problem should be handled well in the practical application of the virtual studio.