Imaging Reader Illumination Synchronization for Mobile Code Detection
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Solution Overview
Problem
Existing imaging readers face challenges in efficiently and reliably reading electronic codes displayed on mobile communication devices due to specular reflection from the device's display screens, which creates hot spots and compromises reading performance.
Innovation Solution
The system automatically detects the presence of a mobile communication device using RF signals and adjusts the illumination light characteristic to minimize specular reflection, synchronizing the illuminating light with the exposure times of the imager's shutter to prevent hot spots during image capture, switching between modes for reading printed and electronic codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the imaging reader uses standard illumination to read electronic codes on mobile devices, then the reading process can be performed, but specular reflection from the display screen creates hot spots that compromise reading performance and reliability
Solution Approach 1:
The patent changes the illumination parameters by using pulsed illumination synchronized with the imager exposure timing. The illumination is provided only during the exposure period and not before or after, which prevents specular reflection from entering the imager while maintaining reliable code reading performance
Solution Approach 2:
The patent implements periodic pulsed illumination that is synchronized with the imager's exposure cycle. The illumination source is activated in periodic pulses that coincide with the exposure timing, creating a rhythmic illumination pattern that eliminates hot spots while maintaining reading reliability
2Productivity
If the imaging reader manually enters data when electronic code reading fails, then data capture can be completed, but additional time is required reducing overall efficiency
Solution Approach 1:
The system performs self-service by automatically detecting when a mobile device is present and automatically adjusting illumination parameters to enable successful electronic code reading. This eliminates the need for manual intervention or manual data entry, allowing the system to serve itself and maintain high productivity without time loss
3Illumination intensity
If the imaging reader continuously illuminates the target, then the field of view remains visible, but specular reflection from electronic code displays creates hot spots that blind the imager
Solution Approach 1:
The patent replaces continuous illumination with periodic pulsed illumination that is synchronized to the imager exposure cycle. The illumination is provided only during the brief exposure period when the shutter is open, and is turned off during the remainder of the frame period, eliminating hot spots while maintaining necessary field of view visibility during capture
Solution Approach 2:
The system performs preliminary detection of mobile device presence using RF signals before initiating the illumination and capture sequence. This preliminary action allows the system to prepare the appropriate illumination mode in advance, ensuring that pulsed illumination is activated only when needed for electronic code reading
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 significantly improves the reading performance of electronic codes by reducing specular reflection, allowing for rapid and reliable data capture without the need for manual entry, enhancing the overall efficiency of imaging readers.
Implementation Method 1
A device detector, such as including an antenna, is provided and operative for detecting when the mobile communication device is proximal to the window by sensing an RF signal radiated from the device
Implementation Method 2
an imaging lens assembly for capturing return light scattered and/or reflected from the symbol being imaged over a range of working distances relative to the module, and for projecting the return light onto the array
Implementation Method 3
the imaging module generally also includes an illuminating light assembly for illuminating the symbol with illumination light over an illumination field for reflection and scattering from the symbol
Data Source
AI summary
A printed code associated with a product is illuminated with light having a first lighting characteristic, and is readable in a default mode of an imaging reader. An electronic code displayed on a mobile communication device is readable in another mode of the reader, with a different second lighting characteristic that is designed to minimize specular reflection from a screen of the device. When the presence of the device in close proximity to the reader is detected, the reader is automatically configured to switch from the default mode to the other mode to enable the electronic code to be read.