Character String Input Apparatus Using Score Data Matching
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Solution Overview
Problem
Existing character string input methods on display devices require complex processing to infer input characters from finger or pen movements, as they need to detect changes in moving direction and speed, which increases processing load.
Innovation Solution
A character string input apparatus that calculates scores for pressed positions on a keypad image, generates score data, and uses image matching techniques to infer input characters without detecting moving direction and speed changes, reducing processing complexity by confirming the first and last characters of the input string.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system detects change in moving direction and moving speed on the locus to infer character string input, then the inference accuracy is improved, but the processing load increases
Solution Approach 1:
The patent extracts only the essential information needed for character string inference - specifically the start position and end position of the sliding operation - while discarding unnecessary information such as the complete locus trajectory, moving direction changes, and speed variations. This extraction approach maintains inference accuracy by focusing on key positional data while significantly reducing processing load by eliminating complex motion analysis.
2Device complexity
If the system uses simple processing to infer character string, then the processing load is reduced, but the inference accuracy may deteriorate
Solution Approach 1:
The patent creates a simplified representation (copy) of the input operation by recording only the start position and end position of the sliding gesture, rather than processing the complete complex motion data. This copied positional information is sufficient for accurate character string inference while keeping processing simple and lightweight.
Data Source
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AI summary
Provided is a technique that is able to infer a character string input by an operator, regarding an input operation in which the operator slides his or her finger, a pen or the like on a screen of a display device, with relatively simple processing. A display unit displays, on the screen of the display device, a keypad image in which a plurality of character keys are arranged. An operation position detection unit detects pressed positions on the screen. A score calculation function unit calculates, for each character key of the keypad image, scores of the pressed positions on the screen. A score data generation function unit generates score data in which the scores of the character keys calculated by the score calculation function unit are registered, for each of the pressed positions on the screen detected by the operation position detection unit, during a character string input period. An input character string inference function unit infers a character string that was input, using score data generated by the score data generation function unit.