AR Depth Measurement Using Segmented Light Source
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Solution Overview
Problem
Current depth measurement technologies in augmented reality devices face challenges in reducing power consumption while effectively modeling three-dimensional spaces, particularly in spatial augmentation techniques for augmented reality, where weight reduction and power efficiency are crucial.
Innovation Solution
The implementation of a method and device that selectively uses dot-patterned and surface-patterned light by dividing a pattern generator into areas for each type of light, allowing partial activation of the light source to reduce power consumption and optimize depth measurement based on object distance and user interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the entire light source unit is activated for depth measurement, then the depth mapping accuracy is improved, but the power consumption increases
Solution Approach 1:
The light source unit is divided into multiple regions corresponding to different pattern generator areas. Only the required regions are activated based on the measurement needs, allowing partial illumination rather than full activation. This segmentation enables the system to maintain depth measurement capability while reducing overall power consumption by keeping only necessary light source portions active.
Solution Approach 2:
The system activates only a partial area of the light source unit rather than the entire light source. By determining the specific area needed for depth measurement and activating only that portion, the system achieves sufficient depth mapping accuracy without the excessive power consumption that would result from full light source activation.
2Length of stationary object
If dot-patterned light is used for deep distance measurement, then the measurement range is improved, but the device complexity increases
Solution Approach 1:
The pattern generator dynamically switches between dot-patterned light and surface-patterned light based on the depth measurement requirements. For distant objects, dot-patterned light is used to extend measurement range, while for closer objects, surface-patterned light provides sufficient coverage. This dynamic adaptation allows the system to maintain measurement capability across varying distances without permanently increasing device complexity.
Solution Approach 2:
The system changes the light pattern parameter (from surface-pattern to dot-pattern) depending on the measurement distance requirements. By adjusting the pattern type based on the target distance, the system extends its effective measurement range while utilizing the existing pattern generator capabilities, avoiding the need for additional hardware complexity.
3Use of energy by moving object
If surface-patterned light is used for near distance measurement, then the power consumption is reduced, but the measurement precision for distant objects decreases
Solution Approach 1:
The system dynamically selects between surface-patterned light and dot-patterned light based on the distance to the target object. For near-distance measurements, surface-patterned light is used to reduce power consumption, while for distant objects, the system switches to dot-patterned light to maintain measurement precision. This dynamic selection allows the system to optimize both power consumption and measurement accuracy according to the specific measurement scenario.
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 enables efficient depth measurement by reducing power consumption and improving the accuracy of depth mapping in augmented reality applications, allowing for effective interaction with virtual objects and gestures while minimizing battery drain.
Implementation Method 1
a light source unit configured to irradiate light for depth measurement
Implementation Method 2
a pattern generator configured to change the irradiated light to patterned light
Implementation Method 3
receive, through the light receiver, light reflected from the object
Data Source
AI summary
A method, by an augmented reality device, of measuring a depth of an object includes determining, from a dot-pattern and a surface-pattern, a pattern of light to be emitted for measuring the depth of the object, identifying, from within an entire area of a pattern generator, a partial area of a light source unit corresponding to an area for the determined pattern, emitting light through the area for the determined pattern, by activating the identified partial area of the light source unit, receiving light reflected from the object; and measuring the depth of the object based on the emitted light and the received reflected light.