Paper Size Detection Using Mark Points on Paperweight
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Solution Overview
Problem
Existing automatic paper size detection methods require additional hardware, such as paper size detectors, which increase costs, occupy feeding space, and complicate hardware installation and design.
Innovation Solution
An automatic detection method that calculates paper size through image analysis by setting mark points on a paperweight, allowing an image sensor to capture scan images of the paper covering these marks, determining the paper's edge length from the coverage zone, and thus determining the paper size without additional sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a paper size detector is arranged in the feeding device to detect paper size, then paper size detection accuracy is improved, but hardware cost and maintenance fee increase
Solution Approach 1:
The patent uses an image sensor to capture an image of the paper and processes this image copy to determine paper size, rather than using a dedicated paper size detector. The image processing unit analyzes the captured image to calculate paper dimensions, replacing the need for specialized detection hardware while maintaining detection accuracy
Solution Approach 2:
The image sensor serves multiple functions: it captures images for paper size detection, and the same image is used for subsequent scanning or processing. This multi-functional approach eliminates the need for separate detection hardware, reducing overall system complexity and cost
2Measurement precision
If a paper size detector is arranged in the feeding space to detect paper size, then paper size detection accuracy is improved, but available feeding space is occupied and reduced
Solution Approach 1:
The image sensor is positioned to serve dual purposes: it captures images for paper size detection and simultaneously captures images for scanning the document content. This eliminates the need for separate detection hardware in the feeding path, preserving feeding space
Solution Approach 2:
The system uses a visual copy (image) of the paper for size detection rather than physical measurement hardware in the feeding path. The image processing unit analyzes the captured image to determine paper dimensions without requiring physical detectors in the feeding space
3Measurement precision
If a paper size detector is arranged in the feeding device to detect paper size, then paper size detection accuracy is improved, but hardware installation and hardware design difficulty increase
Solution Approach 1:
The patent replaces complex physical detection hardware with image processing. The image sensor captures an image of the paper, and software algorithms process this image to determine paper size, significantly simplifying hardware installation and design while maintaining detection accuracy
Solution Approach 2:
The patent substitutes mechanical detection hardware with an optical-imaging system combined with software processing. Instead of mechanical sensors or detectors in the feeding mechanism, the system uses image capture and digital image processing to determine paper dimensions, reducing mechanical complexity
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
Effectively detects paper size without additional sensors, reducing hardware costs and complexity, and optimizing feeding space usage.
Implementation Method 1
acquiring a scan image comprising a plurality of row images in continuous by controlling an image sensor to continuously sense the mark points of the paperweight during a paper passing between the paperweight and the image sensor
Data Source
AI summary
An automatic detection method for a paper size is disclosed. a plurality of mark points is set on a paperweight along a paperweight direction that is different from a feeding direction. The disclosure senses a plurality of row images combining into a scan image during a paper passing between the paperweight and an image sensor, determines an edge length of the paper based on a range of the mark points covered by the paper, and determines a paper size based on the edge length. The disclosure can effectively detect the paper size without any additional sensors.