Digital Watermark Sorting for Conflicting Plastic Identification
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Solution Overview
Problem
Current waste sorting systems face challenges in accurately identifying and sorting plastic items, especially when they are damaged, soiled, or partially occluded, leading to inefficiencies in recycling processes.
Innovation Solution
The implementation of digital watermarks encoded onto plastic items, which are decoded using cameras and analysis systems to determine the type of plastic and other attributes, with a sorting logic processor arbitrating conflicts between different identification methods, ensuring accurate sorting into bins based on type and condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital watermarks are used to identify plastic items, then identification accuracy is improved, but system complexity increases due to multiple analysis systems and conflict arbitration
Solution Approach 1:
The system divides the identification task into two separate analysis systems: one for decoding digital watermark payload data and another for spectroscopy-based plastic type determination. Each system handles a specific aspect of identification, and their results are combined through sorting logic to achieve high accuracy while maintaining modular complexity
Solution Approach 2:
A sorting logic processor acts as an intermediary between the two analysis systems, receiving their conflicting or complementary results and arbitrating to determine the final plastic type identification. This mediator resolves conflicts and integrates information from multiple sources without requiring complete system redesign
2Reliability
If multiple analysis systems are used to determine plastic type, then identification reliability is improved, but processing time increases due to conflict arbitration
Solution Approach 1:
The system performs preliminary decoding of digital watermark payload data, which contains pre-stored plastic type information and other attributes. This preliminary identification allows the spectroscopy system to focus only on confirming or correcting the plastic type, rather than performing complete identification from scratch, thus reducing overall processing time while maintaining reliability
3Manufacturing precision
If digital watermarks are implemented on plastic items, then sorting accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The digital watermarking system serves multiple functions: it identifies plastic type, indicates food contact status, and provides other product attributes. This multi-functionality consolidates multiple identification requirements into a single marking system, simplifying the overall manufacturing process despite the initial complexity of implementing watermarking technology
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 solution enables high-reliability identification and sorting of plastic items, even when they are damaged or soiled, by using digital watermarks to provide accurate metadata for sorting, thereby improving the efficiency of recycling processes.
Implementation Method 1
The first analysis system processes imagery to decode digital watermark payload data found on certain of the items
Implementation Method 2
The second analysis system is a spectroscopy system that determines the type of plastic in each item by its absorption characteristics
Data Source
AI summary
Images depicting items in a waste flow on a conveyor belt are provided to two analysis systems. The first system processes images to decode digital watermark payload data found on certain of the items (e.g., plastic containers). This payload data is used to look up corresponding attribute metadata for the items in a database, such as the type of plastic in each item, and whether the item was used as a food container or not. The second analysis system can be a spectroscopy system that determines the type of plastic in each item by its absorption characteristics. When the two systems conflict in identifying the plastic type, a sorting logic processor applies a rule set to arbitrate the conflict and determine which plastic type is most likely. The item is then sorted into one of several different bins depending on a combination of the final plastic identification, and whether the item was used as a food container or not. A variety of other features and arrangements are also detailed.