Input Tool Marker for Accurate Identification
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Solution Overview
Problem
Existing input apparatuses face challenges in accurately determining the type of input tools, such as stylus pens, due to variations in pen conditions, position, angle, background, and environment, requiring advanced image analysis.
Innovation Solution
An input apparatus with a coordinate detector, image-capturing device, and input-tool identifier that captures a marker on the input tool to accurately determine the tool's attribute and generate input data, using an infrared touch panel and cameras to recognize marker patterns for precise identification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If advanced image analysis is used to determine whether a stylus pen is included in the captured image and to specify the color of the tip of the pen, then the accuracy of determining the type of input tool is improved, but the device complexity increases
Solution Approach 1:
The patent introduces a marker as an intermediary object attached to the input tool. This marker serves as a mediator between the input tool and the image-capturing device, enabling reliable identification of the input tool type without requiring complex image analysis of the tool itself. The marker's distinct visual characteristics provide clear, easily distinguishable signals that resolve the contradiction between accurate identification and simple processing.
Solution Approach 2:
Instead of directly analyzing the complex visual characteristics of the input tool (which varies with position, angle, and background), the patent uses a standardized marker that copies or represents the input tool's identity. This marker provides a consistent, simplified representation that can be reliably detected and processed, reducing the complexity of image analysis while maintaining accurate identification.
2Measurement precision
If the position and color of the tip of the pen are specified based on the captured image, then the accuracy of determining the type of input tool is improved, but the difficulty of detecting and measuring increases due to variations in pen condition, position, angle, background, and environment
Solution Approach 1:
The marker acts as an intermediary that carries identification information about the input tool. Instead of directly detecting and measuring the tip position and color under varying conditions, the system detects the marker's position and uses it to infer the input tool type. The marker provides stable, easily detectable features that are not affected by the same variations that affect direct tip detection.
Solution Approach 2:
The patent extracts the identification function from the input tool itself and places it in a separate, dedicated marker. This separation allows the marker to provide clear, unambiguous identification signals independent of the input tool's position, angle, and background conditions. The marker's extracted visual features are specifically designed for easy detection and reliable identification.
Data Source
AI summary
An input apparatus includes a coordinate detector that detects position coordinates of an input on an input screen by an input tool, an image-capturing device that captures an image of a marker disposed on the input tool and indicating information on an attribute of the input tool, an input-tool identifier that identifies the attribute on the basis of the image of the marker captured by the image-capturing device, and an input-data generator that generates input data of the input tool on the basis of the position coordinates detected by the coordinate detector and the attribute identified by the input-tool identifier.