Reinforcing Embedded Pattern Intensity in Scanned Document Copies
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Solution Overview
Problem
Existing methods fail to accurately reproduce embedded information in printed materials during copying due to insufficient pattern intensity at the time of printing and limitations in scanner device performance, leading to deterioration of embedded information in copied documents.
Innovation Solution
An image processing apparatus with a copy function that scans, extracts embedded information, and generates a new image for printing, reconfiguring the information if the original is confirmed as authentic, using masks to embed data in a way that minimizes visual recognition and ensures pattern integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If embedded information is formed with low density to avoid visual recognition, then the information is hidden effectively, but the intensity becomes insufficient for accurate reading by scanners
Solution Approach 1:
The patent applies parameter changes by adjusting the density and intensity parameters of the embedded pattern based on the detected reading quality. When the scanner reads the embedded information, the system analyzes the intensity distribution and dynamically modifies the pattern parameters (density, contrast) to optimize both hiddenness and readability, resolving the contradiction between low visual recognition and high measurement precision
2Device complexity
If the scanner reads embedded information with limited performance, then the copying process is simple, but the embedded information deteriorates due to insufficient intensity
Solution Approach 1:
The patent implements feedback by having the scanner read the embedded information intensity, analyzing the quality of the read data, and then adjusting the pattern reinforcement based on the detected intensity levels. This closed-loop feedback mechanism ensures that the embedded information maintains sufficient intensity and integrity throughout the copying process, improving reliability without significantly increasing device complexity
Solution Approach 2:
The patent applies preliminary action by pre-processing the embedded pattern before scanning - specifically, by reinforcing the pattern intensity in advance based on predicted scanning limitations. This preliminary reinforcement ensures that even when scanners with limited performance read the information, the intensity remains sufficient to maintain accuracy and prevent deterioration
3Measurement precision
If the pattern intensity is increased to ensure readable embedded information, then the reading accuracy improves, but the information becomes more visually recognizable
Solution Approach 1:
The patent applies local quality by differentiating the treatment of different regions within the embedded pattern. Instead of uniformly increasing intensity across the entire pattern, the system identifies specific local areas where intensity reinforcement is needed based on the original pattern structure and scanning characteristics. This localized approach maintains overall pattern hiddenness while ensuring critical reading areas have sufficient intensity
Data Source
AI summary
An object is to provide a copy function that guarantees intensity of embedded information. At the time of copying a printed material, embedded information is extracted from a scanned image obtained by scanning the target printed material. Then, in a case where it is confirmed that the copy-target printed material is an authentic document by the extracted embedded information, the embedded information extracted from the scanned image is reconfigured and printed and output.