Pressure-Sensing Shelf Pad for Product Detection and Classification
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Solution Overview
Problem
Current methods for detecting, identifying, and classifying objects on a surface in retail environments, such as shelves, are inefficient and lack precision, particularly in detecting out-of-stock or misplaced products, and require manual intervention or video cameras with depth sensors.
Innovation Solution
A sensor pad with a matrix of electrical contacts that vary in resistance or capacitance based on pressure, allowing for automated detection and classification of objects through scanning, including determination of size, shape, location, center of mass, and weight, using conductive ink and resistive or capacitive materials, and weight sensors for accurate object placement and removal tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If video cameras and depth sensors are used to detect objects, then detection capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex optical detection systems (video cameras and depth sensors) with a simpler electrical resistance-based detection system. The sensor pad uses an array of electrical contacts that detect object presence through changes in electrical resistance when pressure is applied, eliminating the need for expensive and complex imaging hardware while maintaining effective object detection capability.
Solution Approach 2:
The invention changes the detection parameter from optical measurements (using cameras and depth sensors) to electrical resistance measurements. By monitoring changes in electrical resistance across an array of contacts on the sensor pad, the system achieves object detection through a fundamentally different physical parameter that is simpler to measure and process.
2Productivity
If manual detection methods are used, then device complexity is reduced, but productivity and accuracy deteriorate
Solution Approach 1:
The sensor pad performs automated detection without requiring manual intervention. The system self-monitors electrical resistance changes across its contact array, automatically identifying object presence, position, and characteristics. This eliminates the need for manual checking while maintaining system simplicity.
Solution Approach 2:
The patent replaces manual detection processes with an automated electrical sensing system. The sensor pad uses electrical resistance changes to automatically detect and track objects, providing continuous monitoring and data collection without human involvement, thereby increasing productivity while keeping the device relatively simple.
3Measurement precision
If hand-based detection is used, then ease of operation is maintained, but measurement precision and reliability worsen
Solution Approach 1:
The sensor pad is divided into multiple discrete electrical contacts arranged in an array, with each contact corresponding to a specific surface area. This segmentation allows the system to detect not only object presence but also precise location, size, shape, and center of mass by analyzing which contacts are activated and their resistance patterns, thereby achieving high measurement precision through spatial division.
Solution Approach 2:
The invention replaces imprecise manual detection with automated electrical resistance measurements. The system electronically measures resistance changes at multiple contact points simultaneously, providing objective and precise data about object characteristics that eliminates human error and subjectivity in detection and classification.
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
Enables precise and automated detection and classification of objects on a surface, improving inventory management by accurately identifying and tracking product placement and movement, reducing manual errors and enhancing real-time monitoring in retail settings.
Implementation Method 1
at least one of the first and second conductors is operable to vary in resistance or capacitance based on an amount of pressure applied to that conductor
Implementation Method 2
at least one of the first and second conductors is operable to vary in resistance or capacitance based on an amount of pressure applied to that conductor
Data Source
AI summary
Systems and methods of detecting, identifying, and classifying objects positioned on a shelf are provided. In one exemplary embodiment, a sensor pad comprises a plurality of electrical contacts disposed in the pad as a matrix of rows and columns of electrical contacts. Further, each contact corresponds to a different surface area of the pad and has a first electrical conductor positioned on a first layer and a second electrical conductor positioned opposite to the first conductor on a second layer. Also, at least one of the first and second conductors is operable to vary in resistance or capacitance based on an amount of pressure applied to that conductor. In addition, each contact is configured to enable an electrical connection between the first and second conductors with a resistance or capacitance that varies based on an amount of pressure applied to a corresponding area of the pad when an object is positioned on that pad.