2D Camera Gesture Recognition Using Reflector for Vehicle Control
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Solution Overview
Problem
Conventional in-vehicle user interfaces that rely on touch screens or other methods can distract drivers and are not effective in recognizing three-dimensional hand gestures, limiting safety and convenience.
Innovation Solution
A system and method using a 2D camera and reflector to capture and process images of a passenger's hand, extracting real and virtual images to recognize gestures by correlation, allowing control of in-vehicle devices without requiring direct hand contact or additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If touch screen or button-based user interface is used, then device control functionality is provided, but driver safety deteriorates due to distraction and eye movement
Solution Approach 1:
The patent replaces mechanical touch-based interaction (touch screens, buttons) with an optical gesture recognition system using 2D cameras. The camera captures hand movements and converts them into control signals, eliminating the need for physical contact with control interfaces while maintaining full device control functionality.
Solution Approach 2:
The patent introduces an intermediary system (camera-based gesture recognition) between the driver and the control interface. Instead of directly touching controls, the driver performs gestures in air that are captured by the camera and translated into control commands, creating a safe intermediate interaction layer.
2Measurement precision
If electrostatic capacitance sensor is used for hand detection, then hand position can be detected, but only one-dimensional distance information is obtained limiting gesture recognition capability
Solution Approach 1:
The patent transitions from one-dimensional distance measurement (capacitance sensors) to two-dimensional spatial mapping (camera imaging). The camera captures X-Y coordinates of hand positions across the field of view, enabling recognition of complex gesture patterns that require lateral and vertical position information, not just distance from a single point.
3Adaptability or versatility
If 2D camera is used for gesture capture, then image-based gesture recognition is possible, but only two-dimensional image manipulation is achieved making it difficult to measure three-dimensional motion
Solution Approach 1:
The patent uses the reflector to create a virtual copy of the hand's three-dimensional position in the two-dimensional image plane. By capturing both the real hand image and its reflected virtual image, the system can infer depth information (Z-axis) from the relative positions and distortions of the real and virtual images, effectively copying 3D spatial relationships into 2D image data.
Solution Approach 2:
The reflector acts as an intermediary that enables 3D motion measurement through 2D imaging. The reflector creates virtual images that encode depth information, allowing the camera to indirectly measure three-dimensional hand motion by analyzing the relationship between real and virtual image positions.
4Adaptability or versatility
If multiple sensors are used for gesture recognition, then more motion information can be captured, but device complexity and cost increase
Solution Approach 1:
The patent makes the 2D camera multi-functional by using it not only for capturing hand gestures but also for inferring three-dimensional motion through reflector-based virtual imaging. This single camera system replaces what would traditionally require multiple specialized sensors (distance sensors, motion detectors, etc.), reducing overall system complexity while maintaining comprehensive gesture recognition capability.
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
Enables safe and convenient operation of in-vehicle devices by recognizing 3D hand motions, allowing passengers to control multiple devices with simple gestures while keeping their eyes on the road, thereby enhancing usability and reducing costs.
Implementation Method 1
recognizing a gesture from image information captured by a reflector and a 2D camera in a vehicle
Data Source
AI summary
A method for manipulating a user interface by a 2D camera within a vehicle includes: receiving a captured image of a passenger and a captured image of the reflection of the passenger on a reflector; extracting real and virtual images of the passenger from the captured images, and recognizing a gesture by a correlation between the real and virtual images; and selecting a vehicle equipment operation corresponding to the recognized gesture. Accordingly, the passenger is able to manipulate the steering wheel with one hand and keep their eyes forward while controlling multiple in-vehicle electronic devices with simple motions with the other hand, thereby improving passengers' convenience and driving safety.