Skew Correction for Chipped Recording Media Edges
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Solution Overview
Problem
Conventional image processing systems struggle to accurately calculate the coordinates of a recording medium's edge portion when it is folded or chipped, leading to inaccuracies in skew correction due to missing edge data.
Innovation Solution
An image processing apparatus is designed with a horizontal edge detection unit, a slanted edge detection unit, and a calculation unit to detect and calculate the coordinates of the edge portion, even if it is chipped, by using filters for edge detection and binarization processes to identify and correct skew angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional edge extraction process is used to detect distal end edge data, then skew correction can be performed, but the edge coordinates become inaccurate when the recording medium has chipped edges
Solution Approach 1:
The patent segments the edge detection process into multiple stages: initial edge extraction, candidate edge identification, and verification through coordinate calculation. By dividing the detection process, the system can identify and handle chipped edges separately from valid edges, maintaining accuracy even when some edge portions are damaged.
Solution Approach 2:
The patent implements a feedback mechanism where the calculated coordinates are verified against expected geometric relationships. If the calculated distal end coordinates do not match the actual edge position (indicating a chipped edge), the system adjusts its detection strategy by searching for alternative valid edge portions and recalculating coordinates accordingly.
2Manufacturing precision
If the system searches for distal end edge data through edge extraction, then inclination correction can be performed, but the correction becomes inaccurate when edge portions are missing due to folding or chipping
Solution Approach 1:
The patent performs preliminary edge extraction and candidate identification before final coordinate calculation. By preparing multiple candidate edge positions in advance and verifying them through geometric constraints, the system ensures that valid edge data is identified even when some edge portions are missing or chipped.
Solution Approach 2:
The patent changes detection parameters dynamically based on edge quality assessment. When chipped edges are detected, the system adjusts its search parameters to focus on alternative valid edge portions, modifying the detection threshold and search range to maintain accurate coordinate calculation despite incomplete edge data.
Data Source
AI summary
There is provided an image processing apparatus for performing image processing on image data generated based on an image of a recording medium conveyed in a conveyance direction, comprising: a horizontal edge detection unit configured to detect a horizontal edge included in the image data; a slanted edge detection unit configured to detect a slanted edge adjoining the horizontal edge included in the image data; a calculation unit configured to calculate coordinates of a distal end of the slanted edge, the other distal end of the slanted edge adjoining the horizontal edge; and a coordinate calculating unit configured to calculate coordinates related to an edge of the recording medium based on the horizontal edge and the coordinates of the distal end calculated by the calculation unit.