Image-Forming Device Calibration Using Self-Printed Reference Patterns
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Solution Overview
Problem
Existing image-forming devices require external reference markers for accurate calibration of sensor units, which introduces uncertainties and complications, especially in determining the alignment of nozzles and sensor units.
Innovation Solution
A method and device for calibrating image-forming devices using self-generated reference patterns, allowing the determination of sensor unit misalignment without external markers by analyzing a printed reference image, utilizing internal reference coordinates and calculating misalignment based on the relative positions of nozzles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external reference markers are used for calibration, then measurement accuracy can be achieved, but device complexity and uncertainty increase
Solution Approach 1:
The invention extracts the reference pattern function from external markers and relocates it to the recording medium itself. The recording medium is printed with a reference pattern that serves as the calibration target, eliminating the need for separate external reference markers and reducing system complexity while maintaining measurement precision.
Solution Approach 2:
The recording medium serves multiple functions: it is both the substrate for the final image output and the carrier of the reference pattern用于校准。This multi-functionality eliminates the need for separate external reference markers, reducing device complexity while maintaining calibration accuracy.
2Measurement precision
If external reference markers are used, then calibration can be performed, but detection errors and uncertainties are introduced
Solution Approach 1:
The invention merges the reference pattern with the recording medium by printing it directly on the same substrate. This integration eliminates potential detection errors and uncertainties associated with separate external markers, as the reference pattern and the image content are calibrated together in the same coordinate system, improving reliability.
3Device complexity
If self-generated reference patterns are used, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The system uses itself to generate the reference pattern through the printing mechanism. The print head prints the reference pattern on the recording medium using the same nozzles that will be calibrated, creating a self-referential calibration system. This approach reduces device complexity while the manufacturing precision requirements are managed through the system's own calibration capabilities.
Data Source
AI summary
The present invention relates to a method for calibrating an image forming device comprising at least one printhead comprising a plurality of nozzles arranged in a plurality of nozzle rows, the image forming device comprises a sensor unit configured to read information from a recording medium on a working area. The method enables determination of misalignment of the sensor unit by analyzing a printed reference image without the need of external reference markers. The invention also relates to an image forming device, a computer program, a non-transient computer-readable data storage medium comprising executable program code and a data stream enabling the calibration method.