3D Finger Motion Detection Without Markers in User Interface
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Solution Overview
Problem
Existing user interface devices for 3D imaging struggle with accurately detecting finger motion due to the need for gloves with markers, which can lead to false pinching motion detection and lack of depth position detection, resulting in cumbersome user experience and inaccurate input operations.
Innovation Solution
A user interface device that measures 3D coordinates of fingers using a sensor unit and a motion detecting unit to accurately detect finger motion without markers, allowing for intuitive operations such as pinching, moving, deleting, enlarging, and turning objects in a 3D display space by analyzing finger motion models and pinching motion models.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a glove with markers is used for detection, then pinching motion can be detected, but false detection occurs and depth position cannot be detected
Solution Approach 1:
The patent extracts the markers from the glove and places them directly on the fingertips instead. This allows the sensor unit to detect marker positions without requiring the user to wear a glove, eliminating false detection caused by glove movement while maintaining pinching motion detection capability
Solution Approach 2:
The patent transitions from 2D marker detection to 3D marker detection by using a sensor unit that measures both planar positions and depth positions of markers. This dimensional enhancement enables accurate detection of pinching motion in three-dimensional space, resolving the limitation of previous 2D-only detection systems
2Measurement precision
If markers are placed on fingertips, then 3D coordinates can be measured, but the system becomes more complex
Solution Approach 1:
The sensor unit is designed to perform multiple functions: detecting marker positions, calculating 3D coordinates, and determining pinching motion. By consolidating these functions into a single device, the patent reduces overall system complexity while maintaining high measurement precision
Solution Approach 2:
The patent uses virtual markers (software-generated visual indicators) that correspond to physical markers on fingertips. These virtual markers are displayed on the display unit and tracked by the sensor unit, creating a simplified interface that reduces physical hardware complexity while enabling precise 3D coordinate measurement
Data Source
AI summary
A user interface device includes: a display unit which displays a two-dimensional or a three-dimensional display object in a display space; a sensor unit which measures 3D coordinates of fingers of a user in the display space; a motion detecting unit which detects motion of the fingers of the user relative to the display object based on the 3D coordinates of the fingers of the user measured by the sensor unit; and a display control unit which changes display content displayed by the display unit, according to a detection result obtained by the motion detecting unit.