Document Size Detection in Image Scanning Devices
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Solution Overview
Problem
Conventional image scanning devices often fail to accurately determine the size of documents, particularly between A4 and letter sizes, leading to potential loss of information due to incorrect scanning regions.
Innovation Solution
An image scanning device with a board, receiving unit, presuming unit, determining unit, and scanning unit that presumes the document's dimensions based on reflected light, determines if it matches standard sizes, and if not, assumes a virtual size to ensure complete scanning, including a virtual size defined by dimensions that encompass both A4 and letter sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the conventional copier detects the width dimension to determine document size, then the document size can be automatically determined, but the detection accuracy is insufficient leading to wrong determination between A4 and letter sizes
Solution Approach 1:
The detection process is divided into multiple stages: initial width dimension detection, longitudinal dimension detection, and comprehensive size determination. By segmenting the detection into separate steps rather than relying solely on width measurement, the system achieves more accurate document size determination.
Solution Approach 2:
The system performs preliminary width dimension detection to narrow down possible document sizes, then conducts further longitudinal dimension detection to make the final accurate determination. This preliminary action approach allows the system to efficiently filter options before committing to a final size determination.
2Productivity
If the scanning region is set based on erroneous size detection, then the scanning operation can proceed, but information loss occurs in portions of the document outside the scanning region
Solution Approach 1:
The system uses feedback from the detected document dimensions to dynamically adjust the scanning region settings. By continuously monitoring the detected width and longitudinal dimensions, the system feedback-adjusts the scanning parameters to ensure the entire document is captured, preventing information loss while maintaining efficient scanning operations.
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 scanning of documents without information loss by determining a suitable scanning range that covers both A4 and letter sizes, ensuring all information is captured.
Implementation Method 1
The receiving unit receives a light reflected on the document putted on the surface
Data Source
AI summary
In an image scanning device, the receiving unit receives a light reflected on a document putted on the surface of the board. The presuming unit presumes a dimension of a horizontal edge of the document based on the reflected light. The determining unit determines, based on the presumed dimension, whether or not the document has one of the plurality of standard sizes. The assuming unit assumes that the document has a virtual size defined by a virtual horizontal edge and a virtual longitudinal edge if the determining unit determines that the document has neither the plurality of standard sizes. The virtual horizontal dimension of the virtual horizontal edge is equal to or larger than the presumed dimension. The scanning unit scans the document over a range corresponding to the virtual size to generate image data.