Near-Infrared Light Emission Control for Viewpoint Tracking
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Solution Overview
Problem
Conventional naked-eye stereoscopic display technologies face challenges in accurately tracking user viewpoint positions, particularly in varying distances and lighting conditions, which affects the quality of stereoscopic image generation.
Innovation Solution
An image processing device equipped with a near-infrared ray emitting unit, a light emission controlling unit, and a detecting unit that adjusts light emission based on distance and captures images to detect feature points, such as eyes, to accurately track user viewpoint positions, ensuring safe and effective emission intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light field display uses fixed light emission intensity for viewpoint detection, then the detection process is simple, but the viewpoint tracking accuracy deteriorates in varying distances and lighting conditions
Solution Approach 1:
The patent implements dynamic light emission control by adjusting the infrared light emission intensity based on the detected distance to the user. The light emission amount is varied according to distance measurements, allowing the system to adapt to different viewing conditions and maintain accurate viewpoint tracking regardless of user position or ambient lighting.
2Measurement precision
If the light emitting unit emits high intensity near-infrared rays to improve feature point detection, then the detection precision improves, but photobiological safety is compromised
Solution Approach 1:
The system dynamically adjusts the infrared light emission intensity based on the measured distance to the user. When the user is farther away, higher emission intensity is used to maintain detection precision. When the user is closer, the emission intensity is reduced to ensure photobiological safety. This distance-based dynamic control allows the system to optimize detection precision while maintaining safety across different viewing distances.
3Speed
If the system adjusts light emission amount based on distance, then the responsiveness to distance changes improves, but the system complexity increases
Solution Approach 1:
The system employs a feedback mechanism where the detected distance information is fed back to the light emission controlling unit, which then adjusts the infrared light emission intensity accordingly. This closed-loop control enables the system to respond automatically and rapidly to changes in user distance, maintaining optimal detection conditions without requiring complex manual intervention or additional hardware components.
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
The solution enables precise tracking of user viewpoints, enhancing the quality of stereoscopic image generation without overexposing users and adhering to photobiological safety standards, while maintaining high responsiveness and stability across different distances.
Implementation Method 1
a light emitting unit that emits a near-infrared ray to a target
Data Source
AI summary
An image processing device includes: a light emitting unit that emits a near-infrared ray to a target; a light emission controlling unit that controls a light emission amount of the light emitting unit on a basis of a distance value between the target and the light emitting unit; and a detecting unit that detects a feature point on the basis of a captured image of the target irradiated with the near-infrared ray.