Short-Range Radar Face Tracking for Low-Power Expression Recognition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing face tracking technologies, such as those using cameras, are power-intensive, require significant processing resources, and are sensitive to ambient light conditions and occlusions, limiting their effectiveness in head-mounted devices.
Innovation Solution
Utilizing short-range radar antennas in head-mounted devices for face tracking, which reduces power consumption, processing requirements, and is less affected by ambient light and occlusions, enabling accurate expression recognition through radar return signals matched to an expression database for animating avatars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If camera-based face tracking is used, then face expression recognition can be achieved, but power consumption increases and processing resources are significantly required
Solution Approach 1:
The patent replaces the optical camera-based face tracking system with a radar-based sensing system. The radar system uses electromagnetic wave reflection to detect facial expressions, substituting the mechanical/optical imaging process with a radio wave-based detection process. This substitution reduces power consumption while maintaining expression recognition capability through radar return signal analysis.
2Measurement precision
If camera-based face tracking is used, then face expression recognition can be achieved, but processing resources and time are significantly required
Solution Approach 1:
The patent replaces the complex optical image processing pipeline with a simpler radar signal processing approach. Instead of analyzing detailed visual features from camera images, the system processes radar return signals that directly encode facial expression information through subtle movements and reflections, significantly reducing computational requirements and processing time.
3Measurement precision
If camera-based face tracking is used, then face expression recognition can be achieved, but sensitivity to ambient light conditions and occlusions increases
Solution Approach 1:
The patent replaces the optical camera system with a radar system that operates independently of visible light conditions. Radar waves can penetrate through various materials and are not affected by ambient light, darkness, or occlusions that block optical sensors. The system detects facial expressions through radar wave reflection patterns that remain consistent regardless of lighting or partial obstructions.
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 radar-based face tracking system decreases power usage, processing time, and enhances accuracy under various lighting conditions, providing effective face expression recognition for augmented or mixed reality applications.
Implementation Method 1
a radar transmit antenna of a head mounted device transmits a transmission radar signal to a face-region
Implementation Method 2
receive a return radar signal from the face-region
Data Source
AI summary
A radar transmit antenna of a head mounted device transmits a transmission radar signal to a face-region. A radar receiver antenna of the head mounted device receives a return radar signal from the face-region. The return radar signal is matched to a selected expression signal included in a plurality of expression signals stored in an expression database.