Alternating Infrared Light Sources for Eyeball Tracking
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Solution Overview
Problem
In existing virtual reality systems, the light sources used for eyeball tracking often interfere with each other, leading to increased calculation errors and reduced accuracy, especially for users wearing myopia glasses.
Innovation Solution
An eyeball tracking method and system that alternates the on-off sequence of left and right infrared light sources, allowing cameras to capture specific frames with and without light, using computer vision and neural network technologies to combine images and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same light sources are adopted in both left and right eyeball tracking modules, then the device structure is simplified, but light rays from the two light sources interfere with each other, increasing calculation errors and reducing eyeball tracking accuracy
Solution Approach 1:
The patent applies periodic action by alternately turning on and off the left and right infrared light sources in sequence. The left light source is turned on for odd-numbered frames while the right light source is turned off, and vice versa for even-numbered frames. This periodic switching eliminates mutual light interference between the two tracking modules while maintaining a simplified device structure with shared light sources.
2Measurement precision
If light sources are alternately turned on and off, then light interference between tracking modules is eliminated, but the complexity of controlling multiple cameras and light sources increases
Solution Approach 1:
The patent merges the control of multiple light sources and cameras into a unified alternating frame system. By synchronizing the left and right tracking cameras to capture frames at different times (odd vs even frames) and coordinating the light source switching with the frame capture sequence, the system manages complexity through temporal separation rather than spatial separation of components.
3Speed
If both left and right tracking cameras shoot simultaneously, then the tracking speed is high, but light from one light source interferes with the other camera's detection
Solution Approach 1:
The patent segments the simultaneous capture process into alternating temporal slots. The left tracking camera captures odd-numbered frames when the left light source is on, while the right tracking camera captures even-numbered frames when the right light source is on. This segmentation in time domain allows both cameras to operate at high speed without mutual light interference.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves tracking accuracy by minimizing light source interference, enhancing the precision of eyeball positioning and providing a better virtual reality experience.
Implementation Method 1
A left tracking camera is set to correspond to a left infrared light source and a right tracking camera is set to correspond to a right infrared light source
Implementation Method 2
the left tracking camera and the right tracking camera are controlled to correspondingly shoot the turned-on left infrared light source or the turned-on right infrared light source
Data Source
AI summary
An eyeball tracking method is provided. A left infrared light source and a right infrared light source are alternately turned on. A left tracking camera and a right tracking camera are controlled to correspondingly shoot the turned-on left infrared light source or the turned-on right infrared light source to form turned-on odd-frame tracking images and turned-on even-frame tracking images. Turned-off even-frame tracking images and turned-off odd-frame tracking images when the left infrared light source and the right infrared light source are alternately turned off in sequence are obtained according to the turned-on odd-frame tracking images and the turned-on even-frame tracking images. The turned-on odd-frame tracking images and the turned-off even-frame tracking images are combined to form a tracking image of one eye, and the turned-on even-frame tracking images and the turned-off odd-frame tracking images are combined to form a tracking image of the other eye.