Capacitance Sensor Array Object Recognition
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Solution Overview
Problem
Existing systems for integrating digital games with physical objects, such as cards and figures, face challenges in accurately detecting the position and direction of objects using proximity wireless communication, particularly with limited resolution and sensitivity, especially when dealing with lightweight cards or multiple objects on a shared surface.
Innovation Solution
An information processing apparatus equipped with a two-dimensional array of capacitance sensors on an operation surface, which discards detection values below a threshold to recognize the position and direction of objects, using feature points and region comparisons to achieve higher resolution detection without increasing sensor density, thereby enhancing object recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a two-dimensional array of capacitance sensors is used to detect object position and direction, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The detection surface is segmented into multiple discrete capacitance sensor positions arranged in a two-dimensional array. Each sensor position independently measures capacitance changes, allowing the system to detect object position and direction through spatial distribution of detection values without requiring a continuous complex sensor structure.
Solution Approach 2:
The patent transitions from single-point or linear sensor detection to two-dimensional array detection. By arranging capacitance sensors in a 2D grid pattern, the system gains spatial resolution in both horizontal and vertical directions, enabling accurate determination of object position coordinates and orientation angles through comparative analysis of detection values across the array.
2Measurement precision
If detection threshold filtering is applied to discard low-value detections, then measurement precision is improved, but information loss increases
Solution Approach 1:
The patent applies different processing strategies to different regions of the detection array based on local characteristics. Detection values above a predetermined threshold are used for primary object position determination, while discarded low-value detections may still contribute to secondary verification or background noise characterization, optimizing the balance between precision and information utilization.
Solution Approach 2:
The system dynamically adjusts the predetermined threshold parameter based on detection conditions. By changing the threshold level adaptively, the system can maintain high measurement precision for clear object detections while preserving information from weak detections that may represent partial object coverage or edge cases, thus reducing information loss.
3Measurement precision
If feature points and region comparisons are used for position recognition, then measurement precision is improved, but calculation complexity increases
Solution Approach 1:
The patent performs preliminary identification of feature points (capacitance sensors with extreme detection values) before conducting full position and direction calculation. By pre-identifying key reference points in the detection array that correspond to object corners or edges, the system simplifies subsequent mathematical computations for determining object center position, orientation, and dimensions, reducing overall calculation complexity.
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
The system effectively recognizes the position and direction of objects with improved resolution, allowing for precise interaction and game control, even with lightweight cards and multiple objects, while minimizing sensor count and manufacturing costs.
Implementation Method 1
a detection unit including a plurality of capacitance sensors arranged in a two-dimensional array along an operation surface
Data Source
AI summary
An information processing apparatus using proximity wireless communication is provided. The information processing apparatus includes a detection unit that includes a plurality of capacitance sensors arranged in a two-dimensional array along an operation surface and a recognition unit that recognizes an object placed on the operation surface on the basis of a detection result of the detection unit. The recognition unit recognizes a position and a direction of the capacitance sensor on which the metal portion included in the object is placed on the basis of the detection result obtained by discarding a detection value less than a predetermined threshold and recognizes a position and a direction less than an interval between the capacitance sensors in the metal portion on the basis of the detection result in which the detection value less than the predetermined threshold is not discarded.