Comprehensive analysis of 3D video technology

There are two very important trends in the development of TV: from standard definition to high-definition high-definition, the resolution will be higher and higher; 3D technology to realize stereoscopic vision. Especially 3D technology is an important trend in the development of TV technology for a long time in the future.

If the 3D is well-made and well-made, it will look very good, the scene is very strong and the picture is very impactful. Some 3D movies are realized through post-production. If the production is not good, it is not as good as 2D movies, because the software converts 2D to 3D. If the quality is not guaranteed when it is converted, the effect is not necessarily better than 2D from a viewing angle. . Therefore, some technical means must be adopted to ensure that the produced 3D stereoscopic content is very consistent with the sensory experience.

How does the human eye perceive 3D?

The very important effect of 3D is the three-dimensional effect, because the parallax between the left and right eyes produces the so-called 3D effect. The parallax has a certain range. If the parallax exceeds the range, it will produce a very bad visual experience, and even watch a 3D movie for a long time. It will be dizzy or uncomfortable. When shooting and post-production of 3D movies and TV, if you do not grasp the parallax or depth of field, there will be a similar discomfort experience. Of course, there is no good evidence that watching 3D will hurt, but there will be discomfort.

The most traditional 3D glasses to see the 3D effect, if you do n’t wear glasses, it will produce a very virtual picture, cyan in front of red, or red in front of cyan, red represents the picture seen by the left eye, and cyan represents the right eye. To the screen. It is precisely because they have a certain level of parallax and parallax that leads to the feeling of 3D. If the 3D picture is not done well, it will feel very bad. The 3D you see in the cinema is not red and blue glasses. The TV at home will have active 3D glasses. Through the interlaced scanning, the first field transmits the left eye picture, and the second field transmits the right eye picture. The left eye is equivalent to closing the right eye, everyone I will get the picture of the left eye, and when I come to the right eye, I will close the left eye. Through active glasses, I can get the images of the left eye and the right eye. Finally, I get the 3D feeling in my mind. There are more 3D on the market now. TV. What I saw in the movie theater is that the left eye passes the horizontal picture through the right eye and the right picture through the vertical picture. No matter which way, the most basic one will have two pictures of the left eye and the right eye, based on the A certain gap, the distance between the left and right eyes is between 60-65 mm.

Figure 1: The naked-eye 3D effect.

There is a certain gap between the left and right eyes to see the two pictures. The human eyes parse the picture. According to the judgment of the human retina, the signals obtained by the left and right eyes are analyzed by the brain to form a three-dimensional feeling, and the relationship between them is resolved. In relation to the three-dimensional, the final result is the 3D effect, which is the process of human eyes perceiving 3D through feeling. It turned out that someone asked a question, if you close one eye, can you feel the effect of 3D? In fact, the depth of the image requires two eyes to perceive, and sometimes it can also sense its stereoscopic information through one eye. Through 2D, the distance will be revealed, and it will provide us with some information, the part of the image that is exposed and hidden, and use this to judge who is in front and who is behind. When watching 3D movies, there are often the effects of images running towards the back of the screen. There are several scenes in "Rio Adventure". When the parrot learns to fly, it will rush to your side. The effect is not always there. It is through the late stage. Specially made. Beijing TV Station has done some 3D experiments, and has gained some experience. It is easier to accept the image when going to the screen. If the effect of going out is not very acceptable, everyone should also consider that the impact of the picture is certain when doing the 3D effect. The ratio, that is, not too much can be done.

Some information can perceive its stereoscopic depth with only one eye. We can see the 3D effect through the change of light and dark, including the change of texture. For example, a flower looks like a piece when it is far away, and it can be clearly distinguished when looking at the close-up. The farther away, the picture will be smaller. Through this information, you can perceive the depth of 2D. We can also perceive the depth of 2D by judging the size of the object or changing the size. Motion parallax, when sitting in a car, near objects are in the opposite direction to us, and these can be perceived by one eye. The position of seeing this object through two eyes is different. This can only be felt through two eyes. Through these, you can sense the three-dimensional distance and depth well.