Touchscreen Gesture Control for Pupil Center Determination
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Solution Overview
Problem
Existing touchscreen-based systems for determining the pupil center in spectacle lens centering lack precision and simplicity, requiring users to adapt to unfamiliar operating behaviors and additional mouse pointer-like interactions.
Innovation Solution
A device utilizing a touch-sensitive display with a gesture recognition unit that identifies specific finger movements for orbital rotation and radial gestures to modify contrast and zoom, allowing precise control without additional operating elements, and providing visual cues to guide the user for accurate pupil center determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touchscreen is used for controlling spectacle lens centering, then the device portability and user accessibility are improved, but the measurement precision and operational simplicity deteriorate due to unfamiliar operating behaviors
Solution Approach 1:
The patent replaces traditional mechanical control interfaces (mouse, keyboard) with a touchscreen interface that directly responds to finger gestures. This substitution allows users to interact with the system using natural touch movements rather than learning complex pointer-based operations, thereby maintaining measurement precision while improving ease of operation and device portability
Solution Approach 2:
The touchscreen interface enables users to directly manipulate and adjust parameters by touching and dragging elements on the display. This self-service approach eliminates the need for intermediate control mechanisms, allowing users to intuitively control pupil center determination and spectacle lens centering functions while maintaining high measurement precision
2Measurement precision
If additional operating elements like mouse pointers are used on touchscreen, then the positioning accuracy is improved, but the device complexity and ease of operation worsen
Solution Approach 1:
The patent extracts and eliminates the need for additional operating elements like mouse pointers from the touchscreen interface. By using direct finger touch and gesture recognition, the system achieves positioning accuracy without requiring separate control mechanisms, thereby reducing device complexity while maintaining measurement precision
Solution Approach 2:
The touchscreen serves multiple functions simultaneously: it acts as both the display medium and the control interface. Finger gestures on the touchscreen directly control pupil center determination, image manipulation, and spectacle lens centering functions, eliminating the need for separate operating elements and reducing overall system complexity
3Measurement precision
If mouse pointer-like operations are required on touchscreen, then the control precision is improved, but the ease of operation and productivity deteriorate due to unfamiliar gestures
Solution Approach 1:
The patent replaces mouse pointer-based control with direct finger touch and gesture recognition on the touchscreen. This substitution allows users to perform control operations with natural finger movements rather than learning complex pointer gestures, thereby maintaining control precision while significantly improving operational efficiency and productivity
Solution Approach 2:
The system changes the interaction parameter from indirect pointer control to direct finger touch. By recognizing various finger gestures (tapping, dragging, pinching) and mapping them to control functions, the system maintains high control precision while enabling users to operate the device intuitively without learning unfamiliar gestures, thus improving productivity
Data Source
AI summary
The invention is directed to an arrangement for determining the pupil center of an eye of a person in an image. The arrangement includes a touch-sensitive display device for displaying the image with the eye of the person and a gesture recognition unit for recognizing a first predetermined gesture in response to a touching of the touch-sensitive display device by a user. The gesture recognition unit is configured to recognize, as a first predetermined gesture, a movement of two fingers at a distance (D) to each other touching the touch-sensitive display and carrying out an orbital rotational movement about a common rotation center. A contrast changing unit changes the contrast of the image displayed on the touch-sensitive display device in response to the user touching the touch-sensitive display device in a manner recognized as the first predetermined gesture by the gesture recognition unit.