OID Touch Positioning Accuracy via Pattern Recognition

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Solution Overview

Problem

Existing optical touch positioning methods using OID technology face challenges in accurately determining the location of a touch area on a touch surface, as the center point of the image may not correspond truthfully with the positioning marks, especially with varying touch area sizes and resolutions.

Innovation Solution

The proposed method employs an OID positioning system with an OID reader that captures images of touch areas, determines the located touch area by analyzing identification patterns, and calculates the precise touch position by accounting for the distance between positioning marks and the image center, enabling accurate mapping onto a display.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the center point of the captured image is used to determine touch area location, then the positioning process is simple, but the positioning accuracy deteriorates due to mismatch between image center and actual touch area center

Engineering Contradiction:

Improvepositioning process complexityVSAvoidtouch area location accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent replaces the simple geometric center calculation method with an optical identification (OID) pattern recognition system. The OID reader captures images of positioning marks and uses optical processing to accurately determine the coordinates of positioning marks, which are then used to calculate the true center of touch areas, substituting the inaccurate mechanical center-point assumption with an optical measurement system.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces positioning marks with embedded OID patterns as intermediary elements between the touch surface and the detection system. These positioning marks serve as reference points that enable accurate coordinate calculation, acting as a mediator that bridges the gap between the simple image capture approach and the precise positioning requirement.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Shape

If positioning marks are used to define touch areas, then touch area boundaries are clearly defined, but the accuracy deteriorates when touch area sizes and resolutions vary

Engineering Contradiction:

Improvetouch area boundary definitionVSAvoidtouch position accuracy under varying resolutions

Core Design Contradiction:

ShapeVSMeasurement precision

Solution Approach 1:

The patent employs OID patterns that encode positional information in a manner that is invariant to scaling and resolution changes. The optical identification system reads these patterns to determine absolute positions, allowing the system to adapt to varying touch area sizes and display resolutions without losing positioning accuracy. The OID technology transforms the positioning problem from one dependent on fixed geometric parameters to one based on encoded information that can be decoded regardless of scale.

Inventive Principle:

Principle #35Parameter changes

3Loss of information

If the image capturing unit captures multiple touch areas, then more positioning information is obtained, but the complexity of determining the located touch area increases

Engineering Contradiction:

Improvepositioning information completenessVSAvoidtouch area identification complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The patent extracts the located touch area identification from the complex multi-touch-area image analysis by using OID patterns as unique identifiers. Each touch area contains an OID pattern that encodes its identity or position information. The system captures images of multiple touch areas but uses the OID pattern recognition to quickly identify which specific touch area is being targeted, extracting the relevant information from the broader context without requiring complex analysis of the entire image.

Inventive Principle:

Principle #2Taking out (Extraction)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach allows for both coarse and fine positioning, ensuring accurate representation of the touch position on a display, improving the accuracy of touch positioning on touch surfaces with varying resolutions and sizes.

Implementation Method 1

an image capturing unit for capturing an image of at least one of the touch areas

Methodology Applied

Scientific EffectLight detection: Light

Data Source

PatentUS9268415B2Touch positioning method utilizing optical identification (OID) technology, OID positioning system and OID reader

Publication Date: 2016.02.23 WISTRON CORP

AI summary

A touch positioning method is adapted for use on a touch surface of optical identification (OID) technology. The touch surface has thereon multiple positioning marks which define multiple touch areas, and multiple identification patterns, each of which is disposed within a respective touch area and is indicative of a location of the respective touch area. The touch positioning method includes steps of capturing an image of at least one of the touch areas of the touch surface, determining, from among said at least one of the touch areas, a located touch area in which a center point of the image is located, and analyzing the identification pattern which is disposed within the located touch area, so as to obtain the location of the located touch area.