Image Reading Apparatus Dual-Surface Copy Protection Detection
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Solution Overview
Problem
Image reading apparatuses with dual reading sections face challenges in accurately detecting copy-protected images due to similarities in patterns, leading to false detections and increased complexity and cost from requiring numerous parameters for precise detection.
Innovation Solution
The apparatus calculates gamma correction values and color correction factors based on a standard chart to ensure consistent image quality across both reading sections, using a shared distinctive color range for detecting copy-protected patterns, thereby reducing the need for multiple image determining sections and lowering costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detection standards are compromised to detect all distinguishing patterns, then detection coverage is improved, but false detection rate increases
Solution Approach 1:
The patent applies parameter changes by utilizing gamma correction values and color correction factors to transform the detection parameters. By adjusting the color space and applying correction factors based on standard charts, the system can detect distinguishing patterns across varying image conditions while maintaining reliable detection thresholds that reduce false positives.
Solution Approach 2:
The patent introduces an intermediary approach by using a shared distinctive color range as a mediator between the reading sections and the detection algorithm. This color range acts as a standardized reference that enables consistent detection across different reading sections without requiring section-specific parameter tuning, thereby improving detection coverage while maintaining reliability.
2Measurement precision
If multiple image determining sections are used for each reading section, then detection accuracy is improved, but device complexity increases
Solution Approach 1:
The patent merges the image determining functions into a shared resource that serves both reading sections. By combining the detection logic and using a common distinctive color range, the system achieves accurate detection without duplicating the entire image determining section for each reading section, thereby reducing device complexity while maintaining detection accuracy.
Solution Approach 2:
The patent implements universality by designing a single image determining section that can universally handle detection for both reading sections. The shared distinctive color range and correction factors enable this single section to function for multiple reading sections, eliminating the need for multiple specialized sections and reducing overall system complexity.
3Measurement precision
If section-specific parameters are used for each reading section, then detection precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent uses parameter changes by applying gamma correction and color correction factors that can be determined through standard charts rather than expensive section-specific calibration. This approach maintains detection precision by accounting for reading section variations while using cost-effective standardization methods instead of expensive custom calibration procedures.
Solution Approach 2:
The patent promotes homogeneity by using a shared distinctive color range and uniform correction factors across both reading sections. This homogeneous approach simplifies manufacturing by eliminating the need for expensive section-specific parameter sets, while still achieving precise detection through standardized correction procedures applied uniformly to all reading sections.
Data Source
AI summary
As provided with a first reading section and a second reading section for reading both surfaces of a document, an image reading apparatus respectively calculates gamma correction values in gamma correcting sections and correction factors in color correcting sections, and corrects colors of criteria images being read by the first reading section and the second reading section in accordance with sample data stored on a storing section in order to substantially match the colors of both criteria images. In addition, the image reading apparatus utilizes an distinctive color range common for the both surfaces which defines a color about a distinguishing pattern, in order to determine whether images of both surfaces contain the distinguishing pattern or not.