Scanner Wrinkle Reduction Pattern Preservation
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Solution Overview
Problem
Existing scanner technologies struggle to correct images with wrinkles without erasing patterns, as uniform darkening of bright portions can make characters illegible and incorrectly identify dark regions, especially when wrinkles occur.
Innovation Solution
A scanner with a processing section that distinguishes between regions with and without patterns on wrinkles, applying wrinkle reduction only to areas with higher luminance than the ground color, using a luminance correction table to adjust luminance without affecting patterns, and gradually changing reduction amounts at region boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If uniform darkening correction is applied to eliminate brightness and darkness in wrinkle portions, then wrinkle effects are reduced, but patterns such as faint characters become illegible
Solution Approach 1:
The patent applies different correction strategies to different regions within wrinkle portions. By detecting patterns such as characters and applying selective correction only to non-pattern areas, the system achieves local quality differentiation - preserving pattern regions while correcting wrinkle-induced brightness variations in surrounding areas, thus resolving the contradiction between wrinkle reduction and pattern legibility
Solution Approach 2:
The patent segments the wrinkle portion into pattern regions and non-pattern regions through image analysis. This segmentation allows independent processing of each region - patterns are preserved while non-pattern areas undergo brightness correction, thereby eliminating wrinkle effects without causing information loss
2Object-affected harmful factors
If dark regions are corrected uniformly, then brightness variations are reduced, but dark regions such as characters are erroneously identified as ground color
Solution Approach 1:
The patent changes the parameter threshold for ground color identification by comparing pixel luminance values against dynamically determined thresholds rather than fixed values. This adaptive parameter adjustment prevents dark character regions from being misidentified as ground color while still enabling effective brightness variation correction in wrinkle areas
3Object-affected harmful factors
If correction is applied to all bright portions, then wrinkle brightness is reduced, but the correction effect becomes conspicuous and unnatural
Solution Approach 1:
The patent applies gradual correction with varying intensities across different regions. By adjusting the correction amount based on local characteristics and transitioning smoothly between corrected and uncorrected areas, the system maintains image naturalness while effectively reducing wrinkle brightness effects
Data Source
AI summary
A scanner reads an original and generates a read image, specifies a first region having a pattern on a wrinkle and a second region having a wrinkle and no pattern from the read image, and performs a wrinkle reduction process in which the wrinkle is not reduced in the first region and the wrinkle is reduced in the second region, included in the read image.