Document Scanning Threshold Control for Preserving Correction Traces
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Solution Overview
Problem
Existing image processing systems fail to maintain correction traces during document digitization, leading to non-compliance with legal requirements for electronic documents, as they either completely remove correction traces or generate documents that do not satisfy visibility conditions.
Innovation Solution
An image processing apparatus with a reading unit, adjusting unit, and operation unit that determines user operations, sets a darker reading mode and higher threshold for pixel brightness conversion to white, and disables changes to these settings when generating electronic documents to ensure correction traces are retained.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If background color removal processing is executed to improve document appearance and compression efficiency, then the paper background becomes white and contrast improves, but correction traces with brightness above the threshold become completely white and disappear
Solution Approach 1:
The patent changes the brightness threshold parameter used in background color removal processing. By setting the threshold to a specific value (e.g., 254 out of 255), the system maintains the ability to remove paper background colors while preserving correction traces that have brightness values at or above this threshold, thus preventing their complete whitening and disappearance.
Solution Approach 2:
The patent introduces a determination step that checks whether correction traces are present in the document before executing background color removal processing. This feedback mechanism allows the system to adjust its processing approach: if correction traces are detected, the threshold is set to preserve them; if not, normal background removal can proceed, thus resolving the contradiction between appearance quality and information preservation.
2Loss of information
If dark reading is executed to suppress correction trace disappearance, then the paper background does not become completely white, but the reading mode setting may be accidentally changed by users, generating non-compliant electronic documents
Solution Approach 1:
The patent performs preliminary determination of whether correction traces are present in the document before finalizing the reading mode and threshold settings. Based on this preliminary analysis, the system proactively sets the appropriate threshold value and reading mode to ensure correction trace preservation, preventing compliance issues before they occur.
Solution Approach 2:
The patent makes the threshold value and reading mode dynamic rather than fixed. The system automatically adjusts these parameters based on the detected presence or absence of correction traces in the document, ensuring that the electronic document generation process adapts to maintain compliance regardless of the specific document content.
Data Source
AI summary
A mechanism capable of suppressing the disappearance of a correction trace is provided. An MFP includes a scanner unit that reads a document and obtains read image data, a data processing unit that converts the color of pixels having a brightness equal to or greater than a threshold value into white, and an operation unit capable of performing at least user operations regarding the scanner unit and the data processing unit. When a CPU of the MFP determines that a first predetermined operation has been performed, the CPU sets a reading mode of the scanner unit to a second reading mode in which the document is read under a darker condition than a first reading mode, sets the threshold value to a second threshold value that is greater than a first threshold value, and disables a change of the second reading mode and a change of the second threshold value.