Autofocus Control Voltage for Package Dimension Calculation
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Solution Overview
Problem
Conventional supply chain control systems fail to record the dimensions of packages as they are imaged, despite using 2D imagers and advanced lenses like liquid lenses for improved focus and barcode scanning.
Innovation Solution
A system and method that utilize a liquid lens assembly with an electrically adjustable focal length, where a focus controller adjusts the control voltage to ensure the image is in focus, and a processor calculates the package dimensions using the focal length and image sensor data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional supply chain control systems use 2D imagers and liquid lenses for barcode scanning, then imaging quality and focus are improved, but package dimension information is not recorded
Solution Approach 1:
The imaging system is enhanced to perform multiple functions: traditional barcode scanning and focus improvement are maintained, while simultaneously capturing package dimension information through automated measurement algorithms that process the captured images to extract dimensional data, eliminating the need for separate measurement devices
Solution Approach 2:
The patent introduces an intermediary processing layer between the liquid lens imaging system and the supply chain control system. This intermediary includes algorithms that analyze the captured images, measure package dimensions, and transmit this information to the control system, thereby bridging the gap between imaging capability and information recording
2Ease of operation
If liquid lenses are used to adjust focal length electrically, then focus control is improved, but system complexity increases
Solution Approach 1:
The system incorporates an autofocus mechanism that automatically adjusts the liquid lens focal length without manual intervention. The system self-regulates by detecting focus conditions and electrically controlling the liquid lens to achieve optimal focus, eliminating the need for complex manual focus control mechanisms
Solution Approach 2:
The patent implements a feedback control loop where the system continuously monitors image focus quality and automatically adjusts the liquid lens focal length accordingly. This feedback mechanism simplifies operation by eliminating manual focus adjustment while maintaining precise control through automated regulatory algorithms
3Loss of information
If package dimensions are calculated from focal length and image data, then dimension measurement capability is added, but processing complexity increases
Solution Approach 1:
The system performs preliminary capture of comprehensive image data at the point of imaging, storing multiple views and metadata including focal length information. This preliminary action ensures that all necessary data for dimension calculation is already available when needed, reducing the complexity of real-time processing
Solution Approach 2:
The patent uses the captured image as a digital copy of the physical package, from which dimension information is extracted through image processing algorithms. This copying approach allows dimension measurement without physical contact or additional measurement devices, simplifying the overall system while adding measurement capability
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 determination of package dimensions during imaging, enhancing the tracking capabilities of supply chain management systems by integrating auto focus and dimension calculation within the imaging process.
Implementation Method 1
Liquid lenses, such as Philips' FluidFocus and lenses developed by Varioptic use liquids to create mechanically variable lenses that have electrically controllable focal points and shapes. These liquid lenses, also referred to as electrowetting, use the voltage or current to vary the geometry of the lens, thereby adjusting the focal length as desired.
Data Source
AI summary
A system and method for determining dimensions of a package during imaging for supply chain management is provided. The system and method utilize a value of an auto focus control voltage when an image of a package is in focus to calculate a magnification ratio. The calculated magnification ratio is used to multiply the dimensions of the package image to obtain the dimensions of the package.