Barcode Reader Object Detection Using Black Back Wall Contrast
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Solution Overview
Problem
Existing barcode readers are unsuitable for open shelving systems and are costly due to the need for complex reflection-based empty identifiers, and they struggle with omnidirectional reading and multidimensional barcodes, limiting their application in automated storage and management systems.
Innovation Solution
A method using a barcode reader with a black plastic bearing point and EN 60825-1 classified LED illumination, which averages gray values from photosensitive elements to determine object presence, allowing for omnidirectional reading and reducing production costs, and enabling the use of commercially available barcode readers like the CSE600 and SE3300.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If reflection-based empty identifiers are used in storage locations, then object presence detection is enabled, but manufacturing costs increase and system complexity increases
Solution Approach 1:
The patent replaces expensive, complex reflective identifiers with simple black markings that are already present on standard storage location back walls. This disposable-like approach uses existing materials (black paint or coating) rather than requiring additional expensive components, thereby dramatically reducing manufacturing costs while maintaining detection functionality.
Solution Approach 2:
The system uses the existing black back wall surface of storage locations to its advantage. Instead of requiring additional identifiers to be attached or installed, the natural black surface serves as the reflective contrast element. The barcode reader leverages this pre-existing feature, eliminating the need for separate identifier components and simplifying the overall system.
2Measurement precision
If reflection-based empty identifiers are used in storage locations, then object presence detection is enabled, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the complex reflective identifier components from the system. By using the existing black back wall surface instead of requiring separate identifier elements, the system removes unnecessary complexity while retaining the core functionality of detecting whether a storage location is occupied.
Solution Approach 2:
The black back wall surface serves multiple functions: it provides structural support for the storage location and simultaneously serves as the contrast element for object detection. This multi-functionality eliminates the need for separate identifier components, thereby reducing system complexity.
3Adaptability or versatility
If laser-based barcode readers are used for omnidirectional reading, then reading capability is improved, but device size cannot be miniaturized and cost increases
Solution Approach 1:
The patent changes the illumination parameters from laser-based coherent light to LED-based incoherent light. This parameter change allows for smaller device size and lower cost while maintaining reading capability. The black background marking enhances contrast with LED illumination, compensating for the reduced omnidirectional capability of non-laser light sources.
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 accurate detection and determination of object presence in storage locations without special reflective surfaces, supporting both open and closed racking systems, and allowing for the use of multidimensional barcodes, while reducing production costs and eliminating the need for additional sensors or complex manufacturing processes.
Implementation Method 1
The object is illuminated with an EN 60825-1 classified LED
Implementation Method 2
Bar code reading devices based on photosensitive media, such as CCD or CMOS-based cameras or line scan cameras
Data Source
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AI summary
A method for detecting and determining a presence of at least one object in at least one storage location without a special reflection surface includes providing a bar code reading device which is connected to a control unit configured to manage an allocation of the at least one object to the at least one storage location. The bar code reader is used in an attempt to detect a bar code in the at least one storage location. Using information from which a grey value is derivable, it is determined whether the at least one object is in the at least one storage location upon the bar code reader being unsuccessful in detecting the bar code. A result is provided to the control unit.