Bioptic Barcode Reader Specular Reflection Mitigation
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Solution Overview
Problem
Bioptic barcode readers face challenges with specular reflections and direct illumination interference, particularly when multiple illumination sources are used for leading and trailing sub-fields of view, which can obscure barcode data and hinder decoding.
Innovation Solution
The bioptic barcode reader employs an optical assembly to split the primary field of view into multiple sub-fields, with dedicated illumination sources for each, and a controller to alternately activate these sources, capturing and processing image data only for the currently illuminated sub-field to mitigate reflections and interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple illumination sources are used for leading and trailing sub-fields of view, then illumination of sub-fields is improved, but specular reflections and direct illumination interference occur that obscure barcode data
Solution Approach 1:
The system alternately activates illumination sources for different sub-fields of view in a periodic manner. The controller switches between illuminating the leading sub-field and trailing sub-field, capturing images during each illumination phase. This periodic activation prevents simultaneous illumination that causes specular reflections and direct illumination interference, while still providing adequate illumination for each sub-field when activated individually.
Solution Approach 2:
The primary field of view is divided into multiple sub-fields of view (leading and trailing sub-fields) using an optical assembly. Each sub-field has its own dedicated illumination source. This segmentation allows independent control and illumination of each sub-field, enabling the system to illuminate only the relevant sub-field at any given time, thereby avoiding interference between multiple illumination sources.
2Ease of operation
If leading and trailing sub-fields of view are configured to come out straighter toward a user for presentation scanning, then ease of operation is improved, but specular reflections become more common
Solution Approach 1:
The system uses periodic activation of illumination sources tailored to the straighter sub-field configuration. When sub-fields are oriented for presentation scanning, the controller alternates illumination between them, capturing images during each phase. This prevents specular reflections that would occur with continuous or simultaneous illumination of multiple sub-fields, while maintaining the ergonomic straighter orientation for user interaction.
3Productivity
If multiple illumination sources are used for multiple sub-fields of view, then scanning coverage is improved, but direct illumination interference occurs when illumination falls back into the reader
Solution Approach 1:
The controller implements periodic activation sequences where only one illumination source is active at a time. During each period, a specific sub-field is illuminated and imaged before switching to the next sub-field. This temporal separation eliminates direct illumination interference that would occur if multiple sources were simultaneously active, while still achieving comprehensive scanning coverage across all sub-fields over multiple cycles.
Solution Approach 2:
The system segments the illumination function by assigning dedicated illumination sources to specific sub-fields of view. The optical assembly divides the primary field into distinct sub-fields, and each sub-field has its own illumination source that is activated only when that sub-field needs to be scanned. This segmentation prevents illumination from one sub-field from interfering with another sub-field's imaging.
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 approach enhances barcode decoding efficiency by preventing sub-fields from being exposed to specular reflections and direct illumination interference, reducing memory requirements, and improving scanning and decoding performance.
Implementation Method 1
an optical assembly configured to split the primary field of view into at least a first sub-field of view and a second sub-field of view
Implementation Method 2
The first sub-field of view passes from a first half of the upper housing portion through the upright window
Implementation Method 3
a first illumination source positioned in the first half of the upper housing portion and configured to illuminate targets appearing within the first sub-field of view
Implementation Method 4
an image sensor having a primary field of view and an optical assembly configured to split the primary field of view
Data Source
AI summary
Example methods and apparatuses to mitigate specular reflections and direct illumination interference in bioptic barcode readers are disclosed. An example method includes creating a first sub-field of view passing through a first window, creating a second sub-field of view passing through a second window, while activating a first illumination source to illuminate the first sub-field of view and deactivating a second illumination source associated with the second sub-field of view, capturing first images of the first sub-field of view, while activating the second illumination source to illuminate the second sub-field of view and deactivating the first illumination source, capturing second images of the second sub-field of view, and attempting to decode a barcode within at least one of the first images and the second images.