What is the principle of VR glasses?

The principle of VR glasses is similar to that of our eyes. The two lenses are equivalent to eyes, but they are far less "intelligent" than the human eye. The ideal state is that the center of the pupil, the center of the lens, and the center of the screen should be in a straight line. At this time, you need to adjust the "pupillary distance" of the lens to make it coincide with the interpupillary distance of the human eye, and then use software to adjust the center of the picture to ensure three points and one line, so as to obtain the best visual effect.

#The operating environment of this tutorial: Windows 10 system, Dell G3 computer.

What is the principle of VR glasses?

VR glasses are VR headsets, virtual reality head-mounted display devices. Since there was no concept of head-mounted display in the early days, unprofessional names such as VR glasses, VR goggles, and VR helmets were given based on the appearance.

VR headsets use head-mounted display devices to close people's vision and hearing from the outside world, guiding users to have a feeling of being in a virtual environment. The display principle is that the left and right eye screens display images for the left and right eyes respectively. After the human eye obtains this differential information, it creates a three-dimensional sense in the mind.

Introduction to the principle of VR glasses

The principle of VR glasses is similar to that of our eyes. The two lenses are equivalent to eyes, but they are far less "intelligent" than the human eye. In addition, VR glasses generally split the screen and cut the content in half, and achieve superimposed imaging through the lenses. At this time, the center of the pupil of the human eye, the center of the lens, and the center of the screen (after split screen) are not in a straight line, resulting in poor visual effects, unclearness, deformation, and many other problems.

The ideal state is that the center of the pupil of the human eye, the center of the lens, and the center of the screen (after splitting the screen) should be in a straight line. At this time, it is necessary to adjust the "pupillary distance" of the lens to make it consistent with the human eye. The interpupillary distance coincides, and then the software is used to adjust the center of the picture to ensure three points and one line, so as to obtain the best visual effect. Some domestic devices are adjusted physically, and some are adjusted through software. For example, the interpupillary distance of Baofeng Magic Mirror needs to be adjusted through the knob above, while SVR Glass requires software to adjust the interpupillary distance.

Principle details

Interlaced display

The working principle of interlaced display mode is to divide a picture into two fields, that is, odd drawing lines The odd-numbered scanning line field or single drawing field formed by the even-numbered scanning line drawing field or the even-numbered drawing line composed of the even-numbered scanning line drawing field or the even drawing field. When using the interleaved display mode for stereoscopic display, we can separate the left-eye image and the right-eye image into single image fields and dual image fields (or in the opposite order). We call this a stereoscopic interleaved format. If you use shutter stereoscopic glasses with interlaced mode, you only need to use the field vertical synchronization signal as the shutter switching synchronization signal. That is, when displaying a single field (i.e., the left eye image), the stereoscopic glasses will cover one eye of the user. , and when the display field is changed, the other eye is switched to cover, and so on, the purpose of stereoscopic imaging can be achieved.

Screen exchange

Its working principle is to interactively display the left and right eye images on the screen. Use stereoscopic glasses with this type of stereoscopic display mode, and only need to use the vertical synchronization signal as a shutter The purpose of stereoscopic display can be achieved by switching the synchronization signal. When using other stereoscopic display devices, the left and right eye images (pictures separated by vertical synchronization signals) can be distributed to the left and right eye display devices.

Parallax Fusion

The reason why people can see three-dimensional scenery is because both eyes can see things independently. There is a distance between the left and right eyes, resulting in some subtle differences in the viewing angles of the two eyes. This difference will cause the scenery seen by both eyes to be slightly displaced. The difference between the images of the left eye and the right eye is called parallax. The human brain cleverly fuses the images of the two eyes to produce a three-dimensional visual effect with a sense of space in the brain.

Since there is only one computer screen, but people have two eyes, the images viewed by the left and right eyes must be separated independently to achieve stereoscopic vision. At this time, you can use 3D stereoscopic glasses to continue to show this parallax on the screen. By controlling the IC, the stereoscopic signal (left eye->right eye->left eye->right eye-> sequentially and continuously and alternately repeated) is sent to the screen, and at the same time, a synchronization signal is sent to the 3D stereoscopic glasses to synchronize them. Switch the left and right eye images, in other words, the left eye sees the scene that the left eye should see, and the right eye sees the scene that the right eye should see. 3D stereoscopic glasses are penetrating liquid crystal lenses that control the opening and closing of the liquid crystal glasses through a circuit. On can control the glasses lens to be completely black so as to block the image of one eye; off can control the glasses lens to be transparent so that the other eye can see the other. An image that should be seen at a glance. 3D stereoscopic glasses can imitate the real situation, so that the left and right eye pictures are displayed on the screen continuously and alternately, and synchronized with the 3D stereoscopic glasses, coupled with the physiological characteristics of the persistence of human vision, you can see true stereoscopic 3D image.

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