Roll-Sheet Image Position Detection Using Color-Selected Marks
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Solution Overview
Problem
Existing methods for detecting the position of an image on a recording medium fail to accurately specify the position when there is a small luminance or color difference between the base color of the sheet and the detection mark, leading to inconsistent or erroneous detection.
Innovation Solution
An information processing apparatus that detects and selects a mark on a recording medium based on luminance measurements, using multiple colored marks to ensure accurate positioning by excluding invalid marks and selecting the one with the largest luminance difference from the sheet base.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dedicated detection mark is printed with the image, then the position can be specified, but the detection fails when the luminance difference between the mark and sheet base is small
Solution Approach 1:
The patent employs detection marks with distinct color characteristics rather than relying solely on luminance differences. By using marks that differ in color from the sheet base (e.g., colored marks on white or black sheets), the system achieves reliable detection even when luminance contrast is insufficient. The color detection mechanism identifies marks based on their spectral characteristics, enabling accurate position specification across various sheet types and printing conditions.
2Reliability
If multiple colored marks are used, then detection reliability improves, but the complexity of mark selection increases
Solution Approach 1:
The patent implements a feedback-based mark selection process where the system reads measurement values from multiple detection marks and automatically selects the most suitable mark for position specification. The control unit evaluates the measurement values obtained from reading the recording medium and determines which mark provides the most reliable detection characteristics. This automated feedback mechanism reduces manual intervention and simplifies the overall process despite using multiple colored marks.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures accurate detection and specification of the image position by eliminating invalid marks and utilizing the most distinct mark for positioning, thereby improving the reliability of print placement.
Implementation Method 1
reading the recording medium being conveyed
Data Source
AI summary
An image forming apparatus detects a plurality of detection marks of different colors formed on a roll sheet based on a measurement result obtained by reading the roll sheet being conveyed, and then selects, from among the plurality of detection marks, a detection mark to be used for specifying a position of an image to be printed on the roll sheet based on a measurement value of each of the plurality of detection marks.