Image Reading Device Dual-Side Ground Color Correction
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Solution Overview
Problem
Image reading devices with two CISs often produce different ground color density values for both sides of a document due to differences in CIS properties or document posture, leading to inconsistent background colors in output images, even when the actual ground colors are equal.
Innovation Solution
An image reading device with a carrying unit, reading unit, and judgment units to determine and apply appropriate ground color corrections for both sides of a document based on obtained density values, ensuring consistent corrections across both faces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ground color correction is applied independently to each side based on individual density values, then correction can be applied when needed, but inconsistent background colors occur when density values differ due to CIS properties or document posture
Solution Approach 1:
The patent segments the ground color correction process into two distinct stages: (1) independent density value acquisition for each document side, and (2) unified correction decision-making based on comparison between sides. This segmentation allows each side to be evaluated individually while ensuring overall consistency through the comparison mechanism.
Solution Approach 2:
The patent implements a feedback mechanism where the density value of one document side is used to influence the correction decision for the other side. By comparing density values and using the relationship between sides as feedback, the system ensures that correction decisions are coordinated rather than independent, preventing inconsistent background colors.
2Ease of operation
If ground color correction is applied to both sides independently, then each side can be corrected according to its own density value, but the output image shows unnatural color differences between front and back sides
Solution Approach 1:
The patent merges the correction decision-making process for both document sides by introducing a comparison mechanism. Instead of treating each side's correction decision independently, the system combines the density value information from both sides and makes coordinated correction decisions, ensuring that both sides are corrected in a unified manner that maintains color uniformity.
3Productivity
If different CISs are used to read both sides of the document, then simultaneous reading is possible, but differences in CIS properties cause different ground color density values even when ground colors are equal
Solution Approach 1:
The patent introduces an intermediary comparison mechanism that mediates between the density values obtained from different CISs. This intermediary process compares the density values and uses the relationship between them to make coordinated correction decisions, effectively compensating for the measurement differences caused by using multiple CISs with different properties.
Data Source
AI summary
An image reading device comprising: a carrying unit; a reading unit; a first obtaining unit to obtain a first value representing a ground color of a first face of the document; a first judgment unit to judge whether to execute correction for the ground color of the first face; a first correction unit to correct the ground color of the first face; a second obtaining unit to obtain a second value representing a ground color of a second face of the document; a second judgment unit to judge whether the second value falls within a predetermined range including the first value; a third judgment unit to judge whether to execute correction for the second face of the document in accordance with a judgment result by the first judgment unit if the second judgment unit judges that the second value falls within the predetermined range; and a second correction unit.