Scanner Edge Line Correction for Sheet Conveyance Deviation
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Solution Overview
Problem
Conventional scanners face difficulties in obtaining accurate scanned images due to sheet characteristics and conveyance mechanism limitations, leading to suboptimal representation of sheets during the scanning process.
Innovation Solution
An image processing apparatus that acquires scan data, detects edge lines, and corrects non-linear edge lines to linear ones, ensuring accurate representation of sheet images by aligning and transforming the data to maintain the integrity of the sheet's outline.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If conventional scanners use a conveyance mechanism to read sheets, then the scanning process can be automated, but the sheet characteristics and conveyance mechanism structure cause the scanned image to deviate from the actual sheet shape
Solution Approach 1:
The system performs preliminary detection of edge lines and determination of their linearity before the scanning process completes. By detecting edge lines from the scanned image and determining whether they are non-linear, the system prepares correction data in advance, allowing the scanned image to be corrected to accurately represent the original sheet shape.
Solution Approach 2:
The patent replaces mechanical correction methods with image processing techniques. Instead of physically adjusting the conveyance mechanism or sheet positioning, the system uses computer-based edge detection and linearity determination algorithms to identify and correct deviations in the scanned image, substituting mechanical precision requirements with computational processing.
2Speed
If the scanner reads sheets during conveyance, then scanning speed is improved, but non-linear edge lines appear in the scanned image due to sheet movement and conveyance mechanism characteristics
Solution Approach 1:
The system implements a feedback mechanism where the scanned image is analyzed to detect edge lines, and the linearity of these edge lines is determined. When non-linear edge lines are detected, correction processing is applied to the scanned image, using the detected edge line information as feedback to restore the original sheet geometry despite movement during scanning.
Solution Approach 2:
The patent changes the parameter representation of edge lines from non-linear (curved or distorted) to linear by applying correction processing. The system identifies non-linear edge lines through parameter analysis and transforms them into linear representations that accurately reflect the original sheet boundaries, maintaining scanning speed while improving geometric accuracy.
Data Source
AI summary
An image processing apparatus includes a processor and a memory storing computer-readable instructions therein. The computer-readable instructions, when executed by the processor, cause the image processing apparatus to: acquire scan data from a scan data generating unit, the scan data generating unit being configured to generate the scan data by optically reading a sheet being conveyed, the scan data representing a scanned image that includes an image indicative of the sheet, the sheet having a plurality of sides; detect a plurality of edge lines from the scanned image by analyzing the scan data, the plurality of edge lines representing the plurality of sides, respectively; determine whether the plurality of edge lines include a non-linear edge line; and correct, when the plurality of edge lines is determined to include a non-linear edge line, the scan data so that the non-linear edge line is changed to a linear edge line.