Rotatable Counting Device for Shelf Inventory Detection of Small Items
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Solution Overview
Problem
Existing systems in materials handling facilities struggle to accurately detect and track interactions involving small or lightweight items due to limitations in camera and load sensor effectiveness.
Innovation Solution
The implementation of rotatable counting devices with visually distinct patterns mounted on shelves, which rotate in response to changes in item placement, allowing cameras to capture images and determine orientation changes to calculate item quantities through image processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cameras and load sensors are used to detect interactions with items, then detection capability is improved for large or visually distinct items, but detection effectiveness deteriorates for small or lightweight items
Solution Approach 1:
The patent introduces an intermediary mechanical counting device that converts the interaction with small or lightweight items into a measurable rotational movement. The counting device acts as a mediator between the items and the camera system, translating item placement into observable orientation changes that can be detected by cameras, thereby resolving the detection effectiveness problem for small items.
Solution Approach 2:
The patent replaces electronic detection systems (cameras and load sensors) with a mechanical counting device for detecting item interactions. The mechanical device uses rotational movement and visual patterns to track item placement, substituting the ineffective electronic sensing approach with a mechanical amplification approach that makes small item interactions visible to cameras.
2Measurement precision
If rotatable counting devices with visual patterns are implemented, then measurement precision for item quantities is improved, but device complexity increases
Solution Approach 1:
The patent uses visual patterns (colors, textures, or markings) on the rotatable component to encode orientation information. These visual changes are detected by camera systems through image processing, allowing precise measurement of rotational position and item quantity without complex electronic sensors or mechanical counters.
Solution Approach 2:
The patent creates a visual copy or representation of the physical item quantity through the rotational position of the marked component. The camera captures images of the visual pattern, and image processing algorithms convert these visual observations into quantitative inventory data, replacing direct mechanical counting with optical copying and analysis.
3Device complexity
If traditional cameras and load sensors are used, then system simplicity is maintained, but detection reliability deteriorates for small items
Solution Approach 1:
The patent transitions from direct detection of item properties (mass, size) to detection of a related dimensional parameter (rotational angle). By converting the detection task from measuring item characteristics directly to measuring the rotational position of a marked component, the system achieves reliable detection of small items using standard camera technology.
Data Source
AI summary
A counting device bears a visually distinct pattern or marking, and is coupled to a pusher or other movable system of a shelf in a manner that causes the counting device to rotate in response to changes in position of the pusher. When items are placed on a shelf, or removed from the shelf, causing the pusher to move, the pattern on the counting device rotates at an angle defined by an extent of the movement of the pusher. Images captured of the counting device at various times may be processed to determine orientations of the pattern at such times. Where a change in an orientation of a pattern is detected, a number of items added to or removed from a shelf may be calculated based on the change in orientation and an event involving the number of items may be determined to have occurred.