Scanner Correction Section for Multi-Sensor Image Displacement
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Solution Overview
Problem
Existing scanners face challenges in maintaining image quality when combining outputs from multiple line sensors due to displacement of the document reading position, leading to reduced sharpness and brightness inconsistencies across scan data.
Innovation Solution
A scanner configuration that includes a correction section to analyze and correct image deviations across overlapping regions read by multiple sensor arrays, allowing for dynamic adjustment of image weights and deformations to maintain image quality, even when the document is displaced from the reference reading position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If outputs from multiple line sensors are combined to scan a document, then scanning coverage is improved, but image quality deteriorates due to reading position displacement
Solution Approach 1:
The patent applies local quality by performing image matching and deviation detection specifically in overlap regions between adjacent line sensor readings. The correction is applied locally to regions affected by displacement rather than uniformly across the entire image, preserving sharpness in areas where multiple sensors contribute while maintaining overall coverage.
Solution Approach 2:
The patent changes parameters by calculating deviation amounts based on image matching results and using these deviations to adjust the combining position of scan data. The correction section modifies the position parameters of scan lines dynamically based on detected deviations, thereby compensating for reading position displacement and improving image quality.
2Productivity
If scan data from multiple line sensors is combined without correction, then processing speed is maintained, but sharpness decreases due to positional displacement
Solution Approach 1:
The patent applies preliminary action by performing image matching and deviation detection on overlap regions before combining the scan data from multiple line sensors. The correction section uses these pre-calculated deviation amounts to adjust combining positions, ensuring sharpness is maintained in the final composite image without requiring post-processing corrections.
3Manufacturing precision
If correction is applied to compensate for reading position displacement, then image quality is improved, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary approach by using overlap regions between adjacent line sensors as reference areas for image matching. These overlap regions serve as mediators to detect deviation amounts, which then guide the correction process. This intermediary method provides a practical way to measure and correct displacement without requiring complex external reference systems.
4Measurement precision
If deviation detection is performed across the entire scan region, then correction accuracy is improved, but processing time increases
Solution Approach 1:
The patent applies segmentation by dividing the scan region into overlap regions between adjacent line sensors and non-overlap regions. Image matching and deviation detection are performed only in the overlap regions, which are smaller segments of the total scan area. This segmented approach maintains correction accuracy in critical areas while significantly reducing the total processing time compared to analyzing the entire scan region.
Data Source
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AI summary
There is provided a scanner that combines images read by a first sensor array and a second sensor array, in which the first sensor array and the second sensor array have read regions which are overlapped partially, and includes a combining section that combines a first read image read by the first sensor array and a second read image read by the second sensor array and a correction section that corrects an image after a combining based on a degree of displacement of a reading position of the document.