Dynamic Background Density for Sheet Outline Reading Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing image inspection systems face challenges in accurately reading the outline of sheets with varying densities, leading to misalignment errors and excessive waste due to fixed background member densities, especially when switching between white and black sheets.
Innovation Solution
An image inspection apparatus with a hardware processor that reads the sheet and background, extracts sheet outline information, and adjusts control based on the density difference between the sheet and background member, using a background member with switchable density to enhance reading accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed background member density is used for reading sheets, then the reading process is simple and fast, but reading accuracy deteriorates when sheet density is similar to background density
Solution Approach 1:
The background member density is made dynamically adjustable rather than fixed. The control unit changes the background member density based on the sheet density detected by the density detector, allowing the background member to adapt to different sheet types (white, black, or intermediate densities) to maximize the density difference and improve reading accuracy of sheet outlines and registration marks
Solution Approach 2:
A feedback mechanism is implemented where the density detector measures the sheet density, and this information is fed back to the control unit which then adjusts the background member density accordingly. This closed-loop control ensures that the background member density is always optimized for the current sheet being processed
2Measurement precision
If the background member density is switched frequently to match each sheet density, then reading accuracy is improved, but control difficulty increases especially when switching between white and black sheets
Solution Approach 1:
The system performs self-adjustment where the control unit automatically changes the background member density based on feedback from the density detector without requiring manual intervention. The system serves itself by detecting sheet properties and autonomously optimizing the background member configuration for accurate reading
3Manufacturing precision
If image position adjustment is performed based on misalignment measurement, then image positioning is improved, but excessive waste is generated when measurements are inaccurate due to density similarity
Solution Approach 1:
The optical reading system is replaced or supplemented with a density detection mechanism that measures sheet optical properties before reading. By detecting sheet density and adjusting the background member accordingly, the system ensures accurate optical contrast for reading registration marks and sheet outlines, preventing false misalignment measurements that would lead to wasted paper
Data Source
AI summary
An image inspection apparatus includes the following. A reader reads a sheet in which an image is printed, reads the sheet together with a background, and obtains a read image. A background member is provided in a position which is to be a background of the sheet when the sheet is read by the reader. A hardware processor extracts sheet outline information of the sheet from the read image and measures a misalignment of a position of the image with relation to the sheet based on the extracted sheet outline information. The hardware processor performs control based on a measured result of the misalignment of the position of the image. The hardware processor adjusts a degree of control performed based on the measured result of the misalignment of the position of the image according to a density difference between the sheet and the background member.