Liquid Discharge Mark Image Noise Detection
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Solution Overview
Problem
Existing liquid discharge apparatuses often erroneously detect noise images as mark images, leading to reduced correction accuracy and image quality due to the use of simple mark images such as single vertical or horizontal lines.
Innovation Solution
The apparatus forms a mark image with multiple intersecting vertical and horizontal lines, which reduces the likelihood of erroneous detection by the reader, allowing for more accurate correction of image positions and densities based on read information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple mark image (single vertical or horizontal line) is used, then the device complexity is reduced, but the measurement precision deteriorates due to erroneous detection of noise images
Solution Approach 1:
The mark image is segmented into multiple independent line elements (vertical lines and horizontal lines) that are distributed across the recording medium. This segmentation allows the detection system to distinguish the mark image from noise by analyzing the spatial distribution and intersection patterns of multiple line segments rather than relying on a single line structure.
Solution Approach 2:
The mark image transitions from one-dimensional (single line) to two-dimensional structure by incorporating both vertical and horizontal lines that intersect each other. This dimensional expansion creates a distinctive pattern space that separates mark images from noise images, improving detection precision without significantly increasing complexity.
2Measurement precision
If multiple intersecting lines are used in the mark image, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The mark image structure serves multiple functions simultaneously: it provides detection references for both vertical and horizontal positions, creates intersection points that enhance recognition accuracy, and forms a distinctive pattern that distinguishes mark images from noise. This multi-functionality justifies the increased structural complexity by delivering multiple benefits from a single design.
Solution Approach 2:
The mark image uses repeated line patterns (multiple vertical and horizontal lines) that can be systematically generated and recognized. The repetition of simple line elements creates a complex but predictable pattern that is easier to process than a single complex feature, allowing the system to handle the increased complexity through algorithmic recognition of repeated structures.
Data Source
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AI summary
A liquid discharge apparatus (100) includes a conveyor (22), a liquid discharge unit (24), a reader (5), and circuitry (6). The liquid discharge unit (24) forms an image on a recording medium (P) conveyed by the conveyor (22). The reader (5) reads the image. The circuitry (6) causes the liquid discharge unit (24) to form a mark image (50) on the recording medium, causes the reader (5) to read the mark image (50) to obtain read information, corrects an image to be formed based on the read information, and causes the liquid discharge unit (24) to form the image, corrected based on the read information, on the recording medium (P). The mark image includes a first mark image (51) including two or more vertical lines and two or more horizontal lines. Each of the two or more vertical lines intersects or contacts each of the two or more horizontal lines.