Document Width Detection Switching for Scanner Edge Failure
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Solution Overview
Problem
Existing reading devices struggle to accurately detect the size of a document when edge detection fails, often relying on the width of side fences, which can lead to incorrect image size determination.
Innovation Solution
A reading device equipped with both a first width detector for normal edge detection and a second width detector using a different method, such as a document width sensor, to determine the document size when the first detector fails.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the reading device uses only edge detection method to detect document width, then the detection process is simple, but the reliability of document size detection deteriorates when edge detection fails
Solution Approach 1:
The system changes the detection parameter or method based on the detection result. When edge detection fails to detect document edges properly, the system switches to using side fence width as the alternative parameter for determining document size, thus maintaining detection reliability under different conditions
Solution Approach 2:
The system performs preliminary detection using edge detection method first, and has pre-prepared alternative detection methods (side fence width measurement) ready to be activated when the preliminary detection fails, ensuring continuous reliable operation
2Device complexity
If the reading device uses only edge detection method, then the device structure is simple, but the measurement precision deteriorates when edge detection fails
Solution Approach 1:
The system switches between different measurement parameters based on detection success. When edge detection precision is insufficient or fails, the system transitions to using side fence width as the alternative measurement parameter, maintaining measurement precision through parameter substitution
3Reliability
If the reading device switches to side fence width detection when edge detection fails, then the reliability of document size detection is improved, but the device complexity increases due to multiple detection methods
Solution Approach 1:
The reading device is designed with multi-functionality, incorporating both edge detection and side fence width detection capabilities within a single system. This allows the device to perform multiple detection functions using integrated components, reducing the complexity increase that would result from completely separate detection systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures reliable detection of document size by switching to an alternative detection method when edge detection fails, preventing image size errors and improving overall accuracy.
Implementation Method 1
The light source irradiates a subject with light. The imaging device receives the light reflected off the subject and generates an image
Data Source
AI summary
A reading device includes a light source, an imaging device, a first width detector, a second width detector, and circuitry. The light source irradiates a subject with light. The imaging device receives the light reflected off the subject and generates an image. The first width detector detects a width of the subject. The second width detector detects the width of the subject using a different method from the first width detector. The circuitry determines a size of the subject. When the first width detector has detected the width of the subject normally, the circuitry determines the width of the subject based on a detection result of the first width detector. When the first width detector has not detected the width of the subject normally, the circuitry determines the width of the subject based on a detection result of the second width detector.