Recently, an article has analyzed that the X-ray space telescope named "瞳", which is worth 1.9 billion, has been ruined because of the mistakes of the satellite finder and the gyroscope. In fact, the star finder and gyroscope are similar to optical positioning and attitude capture in VR. All along, everyone is saying that VR positioning technology is difficult, so where is it difficult? The author is a practitioner of the VR industry and this article will explore this issue.
I believe that the real cause of destruction of "çž³" must be much more complicated than that described in the article. I am not writing this article to discuss "çž³" with everyone, but to talk to you about some of the thoughts caused by this incident.
Optical positioning and gesture capture in “瞳†and VR
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The positioning technology of the star finder is probably that the target object (ie, the cymbal itself) captures the stars in the background, and obtains its own orientation information according to the obtained image and the position of the identified stars. The singular gyroscope is used to detect the spatial attitude of the çž³ itself. Therefore, the star finder and gyroscope actually implement optical positioning and attitude capture similar to VR.
(1) Optical positioning technology
The optical positioning technology in VR is to capture a target object by using a camera, and to derive information such as the position and posture of the target object based on the obtained target image and the position information of the camera itself. According to different marking technology, optical positioning technology is divided into active and passive.
The specific implementation process: the positioning object is covered with marking points, and the marking point can autonomously emit an optical signal or reflect a point signal transmitted by the positioning system, so that the marking points in the image captured by the camera can be clearly distinguished from the surrounding environment. After the camera captures the marked points on the target, the images captured by the multiple cameras from different angles are transmitted to the computer, and the useless information is filtered by the visual algorithm to obtain the position of the marked points. The positioning method requires multiple CCDs to track and locate the target, and at least two images with the same mark point are required for sub-pixel extraction and matching operations to calculate the spatial position of the target. The implementation flow chart is as follows:
Optical positioning technology implementation process
At present, the most recognized optical positioning technology in the world is OpTItrack. The OpTITrack positioning solution is suitable for a variety of application directions such as game and animation, motion tracking, mechanical analysis, and projection mapping, and has a great influence in the VR industry.
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