Image Skew Correction in Printer Engines Using Extended Scanning Area
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Solution Overview
Problem
Existing image processing systems fail to adequately correct skew of exposure scanning lines near the end portions of the main-scanning width due to limited correction information generation, leading to incomplete skew correction and image distortion.
Innovation Solution
An image processing apparatus generates and applies correction information across a larger area in the main-scanning direction than the exposure scanning area, using line shifting and smoothing processing to correct skew in the sub-scanning direction, ensuring accurate skew correction near the end portions of the main-scanning width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If correction information is generated only for the main-scanning width area of the printer engine, then the correction process is simple and efficient, but the skew correction is insufficient near the end portions of the main-scanning width
Solution Approach 1:
The system performs preliminary action by generating correction information for a wider area than the current printer engine's main-scanning width. This advance preparation ensures that correction data is available for end portions of the scanning area, allowing complete skew correction without requiring complex real-time calculations during the actual printing process.
2Manufacturing precision
If the smoothing processing is not performed when no line shifting point is detected near the end portion, then the processing is simplified, but the skew correction is incomplete and image distortion remains
Solution Approach 1:
The system uses feedback by detecting line shifting points based on correction information and dynamically determining whether to perform smoothing processing. This feedback mechanism ensures that smoothing is applied only when and where needed (when line shifting points are detected), maintaining processing efficiency while ensuring complete skew correction and preventing image distortion.
Data Source
AI summary
An image processing apparatus, when correcting image data using correction information, corrects skew of the image in the sub-scanning direction that is formed by the image forming unit by correcting the image data also at an end portion of an area where an image forming unit forms the image.