Image Reading Device Skew Correction
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Solution Overview
Problem
Existing image reading devices with automatic document feeders (ADFs) face complexity in skew correction for two-sided reading, requiring separate skew detection mechanisms for each surface, which complicates the device structure and increases costs.
Innovation Solution
An improved image reading device with a single skew correction system that detects the skew angle on one surface, performs correction, and applies a reverse skew angle to the other surface, eliminating the need for separate correction systems for each surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate skew detection mechanisms are provided for each surface in two-sided reading, then skew correction accuracy is improved, but device complexity increases
Solution Approach 1:
The skew detection mechanism is designed to perform multiple functions: it detects skew on the front surface, and through the controller's processing, enables skew correction for both front and rear surfaces. The single physical mechanism serves universal skew detection purposes for two-sided reading, eliminating the need for separate mechanisms while maintaining correction capability.
Solution Approach 2:
The controller creates a virtual copy of the skew detection capability by processing images from both surfaces and applying appropriate skew correction algorithms. Instead of requiring a second physical detection mechanism, the system uses software-based image processing to replicate the skew correction function for the rear surface, achieving the effect of having separate mechanisms without the physical complexity.
2Reliability
If separate skew detection mechanisms are provided for each surface, then skew correction reliability is improved, but manufacturing cost increases
Solution Approach 1:
The single skew detection mechanism is designed with universal applicability to handle both front and rear surface skew detection. This reduces component count and manufacturing cost while the controller's intelligent image processing ensures reliable skew correction for both surfaces, maintaining reliability without increasing manufacturing complexity.
Solution Approach 2:
The system replaces the need for a second mechanical skew detection mechanism with software-based image processing and computational algorithms. The controller uses digital image analysis to detect and correct skew on both surfaces, substituting mechanical complexity with computational intelligence, thereby reducing manufacturing cost while maintaining correction reliability.
3Device complexity
If a single skew detection mechanism is used for both surfaces, then device complexity is reduced, but skew detection precision may deteriorate
Solution Approach 1:
The system compensates for the limitations of a single physical detection mechanism by employing advanced software-based image processing algorithms. The controller analyzes image data from both surfaces with high precision computational methods, replacing the need for multiple mechanical detectors with intelligent digital processing that achieves equivalent or superior detection precision.
Solution Approach 2:
The system implements feedback mechanisms where the controller continuously monitors and analyzes image data from both surfaces, adjusting skew correction parameters based on detected skew angles. This feedback loop ensures high detection precision is maintained through iterative optimization, compensating for the use of a single detection mechanism and ensuring accurate skew correction for both front and rear surfaces.
Data Source
AI summary
An image reading device includes a first reading device, a second reading device, and circuitry. The first reading device reads an image of one surface of a document. The second reading device reads an image of other surface of the document. The circuitry detects a first skew angle of skew in the read image of the one surface, performs skew correction on the image of the one surface based on the first skew angle, and forms a second skew angle for the image of the other surface. The second skew angle corresponds to reverse of the first skew angle. The circuitry further performs the skew correction on the image of the other surface based on the second skew angle, and outputs at least one of the image of the one surface subjected to the skew correction and the image of the other surface subjected to the skew correction.