As an important part of improving the experience of VR products, eye tracking can solve many problems such as clarity, immersion and natural interaction.
So what is eye tracking?
When the person's eyes look in different directions, there will be subtle changes in the eye. By analyzing these changes, the state and needs of the user can be predicted.
Eye tracking is mainly to obtain these subtle motion information of the eyeball to guide the device to perform a series of operations. The tracking method is based on the changes in the characteristics of the eyeball and the periphery of the eyeball. The second is based on the change of the iris angle, and the third is to actively project infrared rays and other beams to the iris to extract features.
What problems can be solved in virtual reality?
Sharpness
At present, the common problem faced by VR hardware manufacturers is that the user's computer hardware cannot meet the requirements of high-definition rendering of display devices. In the case that the display resolution is still not up to the VR standard, the purchase of a machine supporting VR devices is close. Ten thousand yuan, computer hardware is not up to standard can be described as a major bottleneck of VR popularity.
In order to solve this problem, the most recognized way is to combine the local rendering technology of eye tracking.
In the process of human eye imaging, the foveal field of view is clearly imaged, covering only 1° to 2° of the field of view, and the visual acuity is high; the peripheral field of view imaging is blurred. Therefore, in the process of rendering the screen, it is only necessary to render a small concave field of view, and the peripheral visual field can be rendered by blur. As the eyeball rotates, the HD rendering area changes as the gaze point changes, thus ensuring image quality and reducing CPU load.
Immersive
At present, the VR perspective change is mainly done by the rotation of the head, but the study found that people used to observe the horizontal ±30° and vertical ±12° angles through the eyeball instead of turning the head. When the scene is contrary to the habits in reality, not only will the immersion be greatly discounted, but it will also cause dizziness.
Eye tracking technology can solve this problem: eye tracking and head rotation cooperate to control the change of perspective and simulate the visual effect in reality. Through the eye control, some menu operations are completed, reducing the frequency of head rotation, and letting people get rid of the unnatural head operation and shaking pictures.
Imaging quality
Light refracts during the process of penetrating the lens, so the current VR display device produces distortion and chromatic aberration at the edge of the viewing angle.
At present, some products adopt a correction scheme based on the center of the lens. Although the ideal state can achieve a good anti-distortion effect, when the position of the human eye is offset from the position of the lens, the anti-distortion effect will follow. Weakened. If eyeball tracking technology is used, the correction plan will be adjusted to the center of the human eye rather than the center of the lens, and the correction effect will be greatly improved.
Eye tracking technology is like a mouse to the operating system for VR. It will make the product experience more perfect and easier to use, providing us with clearer and more realistic visual scenes, creating a more realistic immersion and providing more effective interaction. the way. Referring to the rapid iteration of the current VR display scheme, it can be seen that the eye tracking technology will become the most indispensable technical module for VR devices .
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