Document Transport Pause Control for Accurate Skew Detection
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Solution Overview
Problem
Existing image capturing devices face reduced accuracy in calculating the inclination angle of transported documents due to document shape variations, leading to inaccurate pausing of document transport.
Innovation Solution
The image capturing device employs a control method that acquires first and second edge positions from captured images to determine the inclination angle of documents, pausing transport when the angle exceeds a specified threshold, using a second straight line to correct for errors caused by partial cut marks on receipt paper sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the inclination angle is calculated using a simple method, then the calculation speed is fast, but the measurement precision is reduced due to document shape variations
Solution Approach 1:
The patent segments the document edge detection into multiple discrete steps: detecting the first edge, detecting the second edge, determining their relative positions, and calculating the inclination angle based on these segmented measurements. This segmentation allows for more precise measurement by breaking down the complex shape variation problem into manageable detection stages, thereby improving inclination angle calculation accuracy despite increased process complexity.
2Manufacturing precision
If the document transport is paused frequently to ensure alignment, then the manufacturing precision is improved, but the productivity is reduced
Solution Approach 1:
The patent implements a feedback mechanism where the inclination angle is continuously monitored during document transport. When the calculated inclination angle exceeds the threshold, the system provides feedback to pause the transport. This feedback-controlled approach ensures documents are aligned correctly (improving manufacturing precision) while minimizing unnecessary pauses by only stopping when actually needed, thus maintaining higher productivity compared to frequent preventive pausing.
3Measurement precision
If the inclination angle threshold is set low to ensure accuracy, then the measurement precision is improved, but the loss of time increases due to more frequent pausing
Solution Approach 1:
The patent optimizes the inclination angle threshold parameter based on the specific requirements of receipt paper sheets. By setting the threshold to 1 degree or more (rather than a lower value), the system maintains sufficient measurement precision for detecting actual misalignment while significantly reducing the frequency of transport pauses. This parameter adjustment balances the need for accurate inclination detection with the need to minimize processing time losses.
Data Source
AI summary
The image capturing device includes a transport section configured to transport a document in a transport direction; a capturing section configured to capture an image from a document transported by a transport section; a control section. The control section acquires a first edge position and a second edge position included in a first edge, which are between a first reference position and a second reference position included in a first edge, from the image captured by the capturing section; in the transport direction, when both the first edge position and the second edge position are on the opposite side of the first straight line passing through the first reference position and the second reference position, pauses the transport of the document when the inclination angle of the second straight line passing through the first edge position and the second edge position relative to the width direction exceeds the prescribed angle.