Image Skew Correction via Folded Corner Detection Marks
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Solution Overview
Problem
Existing image forming apparatuses face challenges in accurately adjusting image formation, particularly when dealing with larger-than-maximum scan size sheets, as they require auxiliary members and complex scanning procedures to detect corner edges and cross-hairs, leading to inefficiencies and user inconvenience.
Innovation Solution
The implementation of a non-transitory computer-readable storage medium storing image data with cross-hairs and corner edge detection marks allows for simplified image adjustment by folding the sheet to bring these marks within the scanner's range, enabling accurate detection and calculation of distances for image skew correction and magnification alignment without the need for auxiliary members.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If auxiliary members and complex scanning procedures are used to detect corner edges and cross-hairs on large sheets, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
The patent extracts the corner edge detection function from complex auxiliary scanning procedures by incorporating corner edge detection marks directly into the recording medium itself. These marks are printed on the medium and automatically detected during normal scanning, eliminating the need for separate auxiliary detection mechanisms and procedures.
Solution Approach 2:
The recording medium serves itself by including corner edge detection marks that enable the scanning system to automatically detect corner edges without requiring external auxiliary members or complex procedures. The medium provides its own detection features that work seamlessly with the existing scanner.
2Manufacturing precision
If auxiliary members are used for image adjustment on large sheets, then manufacturing precision is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent merges the corner edge detection marks with the existing image content or background on the recording medium. This integration eliminates the need for separate auxiliary members while maintaining the precision required for accurate image formation and adjustment.
Solution Approach 2:
The corner edge detection marks serve multiple functions: they enable corner edge detection, provide reference points for image alignment, and work with sheets of various sizes. This multi-functionality simplifies the manufacturing process by using a single integrated solution rather than multiple specialized components.
3Productivity
If the scanning range is limited to maximum scan size, then productivity is improved, but adaptability deteriorates
Solution Approach 1:
The patent places corner edge detection marks at the corners of the recording medium, which are detectable even when the sheet extends beyond the maximum scan size. By focusing detection on the corner regions rather than requiring scanning of the entire large sheet, the system maintains high productivity while achieving greater adaptability to various sheet sizes.
Data Source
AI summary
A non-transitory computer-readable storage medium stores image data for adjustment of image formation. The image data includes a cross-hair formed in a corner of a recording medium, and a corner edge detection mark formed to detect a folded corner edge of the recording medium from read data obtained when the corner of the recording medium including an area where the cross-hair is formed on one side is folded to an opposite side to the one side of the recording medium and an image reader reads the opposite side.