Touchscreen Input Scaling for Precision Adjustment
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Solution Overview
Problem
Touchscreens lack precision for applications requiring accurate input, such as photo editing and Computer Assisted Drafting, as finger or stylus inputs are not as precise as a computer mouse and zooming in and out can be cumbersome.
Innovation Solution
A method and apparatus for precise multi-touch input, where a first touch input is detected at a location on a touchscreen, and a second touch input is used to adjust the first location, allowing for smaller movements to achieve more precise adjustments, enabling precise selection and manipulation of on-screen elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a finger or stylus is used as an input device on a touchscreen, then the device can provide wireless communication and basic input functions, but the input precision is insufficient for applications requiring accurate input such as photo editing and CAD programs
Solution Approach 1:
The input operation is segmented into two distinct phases: a first touch input for initial selection and a second touch input for precise adjustment. This segmentation allows the system to separate theç²— selection function from the fine adjustment function, thereby achieving high precision input while maintaining ease of operation through intuitive multi-touch gestures
Solution Approach 2:
The patent introduces a temporal dimension to the touch input by processing the second touch input after the first touch input is removed. This temporal sequencing allows the system to distinguish between initial selection and subsequent adjustment operations, enabling precise control without requiring the user to maintain constant pressure or complex gestures
2Measurement precision
If the user zooms in and out to achieve greater accuracy in touchscreen input, then the input precision can be improved, but the process becomes time-consuming and cumbersome
Solution Approach 1:
The first touch input performs the preliminary action of selecting the initial location before the user needs to make precise adjustments. By establishing the baseline position first, the system eliminates the need for time-consuming zoom operations, as the user can directly make fine adjustments through the second touch input at the desired precision level from the start
Solution Approach 2:
The system introduces an intermediary processing step where the processor calculates the adjusted location based on the relationship between the first and second touch inputs. This intermediary calculation allows the system to translate the second touch input into a precisely adjusted first location without requiring visual zooming, thereby saving time while maintaining accuracy
Data Source
AI summary
An apparatus and method for precise multi-touch input are provided. The method includes detecting a first touch input at a first location on a touchscreen; while the first touch input is maintained, detecting a second touch input at a second location on the touchscreen; detecting removal of the first touch input at the first location while the second touch input is maintained; and adjusting the first location according to movement of the second touch input, such that movement of the adjusted location is less than the movement of the second touch input.