Dual-Position Scanning for Document Presence Detection
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Solution Overview
Problem
Existing reading apparatuses fail to accurately differentiate between the presence and absence of a document on a platen, leading to unnecessary notifications when no document is set, as they do not account for scenarios where no document is present.
Innovation Solution
A reading apparatus with a dual-position scanning mechanism and output comparison system that determines the presence of a document by analyzing outputs from two different positions on the platen, using shading correction data to differentiate between document presence and absence, thereby avoiding false notifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the reading apparatus reads the document again after a certain period of time to notify the user of an unremoved document, then the user is notified of unremoved documents, but the user may be notified of an unremoved document even when no document is set on the platen
Solution Approach 1:
The system performs a preliminary check by reading a first position on the platen before conducting the main document verification. This preliminary action captures baseline data about the platen surface without a document, which is then used to distinguish actual documents from the absence of documents, preventing false notifications
Solution Approach 2:
The patent introduces an intermediary reference reading at a first position that serves as a mediator between the platen surface and the document detection process. By comparing the main reading at a second position against this intermediary reference, the system can identify whether differences are due to actual documents or merely the natural variation in the platen surface
2Measurement precision
If the reading apparatus performs scanning to detect document presence, then document presence can be detected, but processing load increases and false notifications occur when no document is present
Solution Approach 1:
Instead of performing complete document verification procedures for every check, the system performs a partial reading at a first position that captures only the essential baseline information needed for comparison. This partial action reduces processing requirements while maintaining detection accuracy
Solution Approach 2:
The patent changes the parameters of the reading operation by performing readings at different positions (first position for baseline, second position for verification) and comparing the output data. By analyzing differences in reading outputs rather than performing full document analysis, the system reduces processing load while maintaining detection precision
Data Source
AI summary
A reading apparatus includes a reader that obtains image data by reading a reading target, a platen on which a document to be read by the reader located at a first position is set, a first member read by the reader located at the first position if there is no document on the platen, a second member read by the reader located at a second position, which is different from the first position, and a determination unit that performs a determination process for determining whether the document is set on the platen on the basis of a first output, which is obtained if the reader located at the first position reads the reading target, and a second output, which is obtained if the reader located at the second position reads the reading target.