Scanner Device Adaptive Decoding Distance
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Solution Overview
Problem
Conventional scanner devices face challenges in appropriately setting capture response and decoding accuracy in relation to the capture distance of a symbol, leading to suboptimal performance.
Innovation Solution
A scanner device and computer program product that adjust error permissivity and collation times for image data based on the judged capture distance, increasing error permissivity and reducing collation times for short distances and lowering error permissivity and increasing collation times for long distances to enhance capture response and decoding accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If error permissivity is increased and collation times are reduced, then capture response is enhanced, but decoding accuracy deteriorates
Solution Approach 1:
The patent applies dynamics by making the decoding parameters (error permissivity and collation times) adjustable and variable based on capture distance. The control unit dynamically changes these parameters according to the measured distance, transitioning from fixed to variable settings to optimize both capture response and decoding accuracy under different conditions.
Solution Approach 2:
The patent changes the parameters of error permissivity and collation times based on capture distance. For short distances, higher error permissivity and fewer collation times are used to enhance capture response, while for long distances, lower error permissivity and more collation times are applied to improve decoding accuracy.
2Measurement precision
If a dedicated capture distance measurement component is added, then capture distance can be accurately judged, but device complexity increases
Solution Approach 1:
The patent applies universality by enabling the existing imaging unit to serve dual purposes: both capturing bar code images and measuring capture distance. The imaging unit captures both the bar code and the reference object in the same field of view, allowing distance calculation without additional measurement components.
Solution Approach 2:
The patent introduces a reference object as an intermediary element that enables distance measurement. By capturing the relative position between the reference object and the bar code in the image, the system can calculate capture distance indirectly through image processing rather than direct measurement.
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
The solution allows for enhanced capture response at short distances and improved decoding accuracy at long distances, effectively adapting to varying capture distances and simplifying the scanner device configuration by eliminating the need for a dedicated capture distance measurement component.
Implementation Method 1
a scanner unit that scans a symbol to obtain image data
Data Source
AI summary
Disclosed is a scanner device comprising: a scanner unit that scans a symbol and obtains image data; a judgment unit that judges whether or not a capture distance from the scanner unit to the symbol is a short distance; and a decoding unit that, in a case where the capture distance is judged to be the short distance, makes setting to perform at least one of increase of error permissivity for the image data with respect to threshold values for judging a size of the symbol, and reduction of the number of collation times for decoding results of the image data, in a case where the capture distance is judged to be a long distance, makes setting to perform at least one of lowering of the error permissivity, and increase of the number of collation times; and decodes the image data in response to the setting.