Staggered Infrared Light Source Timing for Eye Tracking Interference
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Solution Overview
Problem
In head-mounted display devices with eye tracking functionality, the mutual interference of infrared light sources on the left and right lens cones leads to errors in eye image capture, resulting in poor human-computer interaction effects.
Innovation Solution
The method involves sending image acquisition instructions to first and second cameras with different acquisition times, empowering the corresponding infrared light sources at staggered times to avoid mutual interference, allowing the cameras to acquire eye images with improved accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If infrared light sources on left and right lens cones are empowered simultaneously, then the eye tracking system can capture images from both eyes at the same time, but mutual interference between infrared light sources causes errors in eye image capture
Solution Approach 1:
The patent applies periodic action by implementing time-division multiplexing where infrared light sources are empowered in alternating periods rather than simultaneously. The controller activates the left infrared light source for a first period to capture left eye image, then activates the right infrared light source for a second period to capture right eye image. This periodic activation eliminates mutual interference while maintaining continuous eye tracking functionality.
Solution Approach 2:
The patent segments the eye image acquisition process into distinct time intervals for left and right eyes. Instead of capturing both eyes simultaneously, the system divides the acquisition into separate segments: first capturing the left eye image during a specific time window, then capturing the right eye image in a subsequent time window. This segmentation resolves the interference problem by ensuring only one infrared light source is active at any given moment.
2Measurement precision
If infrared light sources are empowered at staggered times, then mutual interference is avoided and eye image accuracy improves, but the acquisition time for each eye image increases
Solution Approach 1:
The system uses periodic action with optimized duty cycles to minimize acquisition time while ensuring accurate capture. The controller employs rapid alternating periods for left and right eye acquisition, with each period carefully timed to capture the necessary image data before switching to the other eye. This approach balances the need for staggered empowerment (to avoid interference) with the need to minimize total acquisition time.
Solution Approach 2:
The patent applies preliminary action by pre-synchronizing the infrared light source activation with the camera shutter timing. Before each image acquisition, the controller ensures the appropriate infrared light source is already empowered and ready, eliminating any delay during the actual capture moment. This preliminary preparation reduces the effective acquisition time while maintaining the staggered empowerment scheme.
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 enhances the accuracy of eye image acquisition, thereby improving human-computer interaction by minimizing interference between the infrared light sources on the left and right lens cones.
Implementation Method 1
empowering at least one first infrared light source and controlling the first camera to acquire a first eye image
Data Source
AI summary
The present disclosure provides a method of acquiring an eye image, an apparatus, a device and a medium. The method includes: sending an image acquisition instruction to the first camera and the second camera, the image acquisition instruction including an acquisition time, and an acquisition time of the first camera and an acquisition time of the second camera being different; according to the acquisition time of the first camera, empowering at least one first infrared light source and controlling the first camera to acquire a first eye image; and according to the acquisition time of the second camera, empowering at least one second infrared light source and controlling the second camera to acquire a second eye image.