Pattern Light Source Grouping for 3D Depth Capture
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Solution Overview
Problem
Mobile terminals face challenges in capturing high-quality three-dimensional (3D) images due to limitations in lighting technologies, particularly in efficiently irradiating light for depth information extraction and achieving uniform brightness with pattern light sources.
Innovation Solution
A mobile terminal equipped with a pattern light source and a control unit that groups light-emitting elements into groups, controlling them to emit light sequentially with varying periods and intervals, and alternately using a surface light source to capture 3D images without overlapping illumination times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple light-emitting elements are activated simultaneously to capture 3D images, then the quality of depth information extraction is improved, but the peak current consumption increases
Solution Approach 1:
The patent applies periodic action by dividing light-emitting elements into multiple groups that operate in alternating cycles. Instead of activating all elements simultaneously, the control unit sequentially activates different groups in periodic intervals, reducing peak current consumption while maintaining adequate illumination for depth information extraction through multiple captured frames
2Area of stationary object
If a pattern light source emits light to multiple areas simultaneously, then the coverage area is improved, but the brightness uniformity deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the pattern light source into multiple independently controllable light-emitting element groups. Each group can be activated separately to illuminate different areas, allowing the system to progressively cover the entire target area while maintaining uniform brightness through controlled sequential activation rather than simultaneous illumination of all areas
3Use of energy by moving object
If light-emitting elements are grouped and activated sequentially, then the peak current is reduced, but the total illumination time increases
Solution Approach 1:
The patent applies continuity of useful action by ensuring that while one group of light-emitting elements is deactivated, another group is simultaneously activated. This overlapping sequential activation maintains continuous illumination coverage throughout the capture process, reducing the total illumination time penalty despite the sequential group activation strategy for peak current reduction
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 quality of depth information extraction, allows for face recognition and gaze recognition, and reduces peak current consumption while achieving uniform brightness for multiple optical spots, enabling efficient 3D image capture with a single camera.
Implementation Method 1
a lighting device including a pattern light source that emits light of a preset pattern
Data Source
AI summary
The present invention relates to a mobile terminal comprising a lighting device and a control method thereof. The mobile terminal according to one embodiment of the present invention comprises: a lighting device comprising a pattern light source for irradiating light of a predetermined pattern; a camera; and a control unit for photographing a 3D image by using the lighting device and the camera, wherein the pattern light source comprises a plurality of light-emitting elements, the plurality of light emitting elements are grouped into a plurality of groups, and the control unit turns on the plurality of groups sequentially and controls the pattern light source so that light emission times of at least some of the plurality of groups are different.