Input Terminal Device Non-Contact Finger Movement Detection
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Solution Overview
Problem
Conventional non-contact input methods for small input terminal devices, such as wrist-worn devices, struggle to accurately distinguish between valid and invalid finger movements, leading to erroneous character input, especially when dealing with characters having multiple strokes or varying writing orders.
Innovation Solution
The input terminal device employs a position detection unit, a display unit, and an operation processing control unit that switches between multiple operation modes based on specific user interactions, allowing only valid movements to be recognized as input, thereby preventing incorrect character recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-contact input method is used to detect finger position on the back of the hand, then input operation can be performed without contact, but invalid finger movements between strokes cannot be distinguished from valid stroke parts
Solution Approach 1:
The patent applies preliminary action by detecting whether the finger has stopped moving at a grid point before initiating character input. The system determines if the finger has been stationary at a grid point for a predetermined time period, and only then starts recognizing character strokes. This preliminary stopping detection prevents the system from误interpreting transient finger movements between strokes as valid input, thereby resolving the contradiction between non-contact operation ease and input accuracy.
2Device complexity
If all detected grid points are treated as valid input, then simple detection is used, but erroneous character recognition occurs due to invalid parts being detected
Solution Approach 1:
The system performs a preliminary action by requiring the finger to stop at each grid point for a predetermined time before registering it as a valid input point. This time-based validation filter is applied to all detected grid points, which effectively eliminates transient movements between strokes while maintaining simple detection processing. The preliminary stopping check ensures that only intentional input points are recorded, thereby improving reliability without significantly increasing processing complexity.
Solution Approach 2:
The patent implements feedback by continuously monitoring the finger position and comparing it with previously detected grid points. When the finger stops at a grid point for the predetermined time, the system provides feedback by registering this as a valid input point and using it for character recognition. This feedback mechanism ensures that only stable, intentional finger positions are processed, filtering out invalid movements while maintaining simple detection logic.
Data Source
AI summary
This input terminal device 1 for receiving a user operation via a position input object PS is provided with: a position detection unit 106 which detects the position of the position input object; a display unit 109a which displays a cursor; and an operation processing control unit 1024 which causes operation processing to be performed. The operation processing control unit has a plurality of operation modes and one of these modes includes a state M0 in which the operation processing control unit does not cause any operation processing to be performed, except for movement of the cursor in accordance with the position of the position input object. The operation processing control unit is configured to switch between the plurality of operation modes when the user has performed a specific operation by means of the position input object.