Image Calibration Method for Photosensitive Drum Uniformity
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Solution Overview
Problem
Image formation devices experience poor uniformity issues due to aging of photosensitive drums, leading to non-uniform images in both horizontal and vertical directions.
Innovation Solution
An image calibration method that acquires end color density values of a calibration reference image, calculates differences with a target value, and performs uniformity calibration by interpolating compensation color density values to blend with the original image, ensuring pixel gray values and raster lattice data align with black point distribution characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the image formation device is used for long time, then the photosensitive drum ages and causes non-uniformity in images, but continuing to use the device without maintenance leads to progressively worse image quality
Solution Approach 1:
The patent performs uniformity calibration by detecting end color density values and calculating compensation values before actual printing operations. This preliminary calibration action compensates for aging effects proactively, preventing image non-uniformity from deteriorating during extended usage of the photosensitive drum.
2Manufacturing precision
If uniformity calibration is performed frequently to maintain image quality, then image uniformity is improved, but printing efficiency is reduced due to repeated calibration operations
Solution Approach 1:
The system performs self-diagnosis by automatically detecting end color density values and determining whether uniformity calibration is needed based on preset thresholds. This self-service mechanism avoids unnecessary frequent calibrations, maintaining image uniformity while minimizing interference with printing efficiency.
Solution Approach 2:
The patent changes the parameter of calibration frequency by using threshold-based decision making. Instead of fixed frequent calibration, the system adjusts calibration timing based on actual detected color density differences, performing calibration only when the difference exceeds the preset threshold, thus balancing uniformity and efficiency.
3Manufacturing precision
If end color density values are detected and compensation is applied to correct uniformity issues, then image uniformity is improved, but the calibration process complexity increases
Solution Approach 1:
The patent extracts only the critical end color density values from the entire image for calibration purposes. By focusing measurement and compensation only on the end regions that exhibit non-uniformity, the system simplifies the calibration process while effectively correcting image uniformity issues without requiring full-image analysis.
Data Source
AI summary
Provided is an image calibration method, an image formation device and a storage medium. The image calibration method includes: acquiring at least one of a first end color density value or a second end color density value of a calibration reference image along a direction to be calibrated; calculating a difference between the at least one of the first end color density value or the second end color density value and a target color density value, to obtain at least one of a first end color density difference value or a second end color density difference value; and performing uniformity calibration on an image to be calibrated if the at least one of the first end color density difference value or the second end color density difference value is greater than or equal to a preset difference threshold.