Inkjet Nozzle Ejection Failure Correction via Landing Interference Patterns
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Solution Overview
Problem
Existing inkjet image formation technologies face challenges in correcting image defects caused by ejection failure nozzles, particularly due to limitations in considering factors like landing interference, which affects the depositing position and dot diameter, leading to visible stripes and insufficient correction performance.
Innovation Solution
An image processing method and apparatus that determines correction coefficients based on landing interference patterns, including deposition sequence and nozzle arrangement, to compensate for ejection failure nozzles by adjusting dot size and position, thereby improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If general ejection failure correction technology is used with the same correction coefficient for all nozzles, then the correction process is simple, but correction becomes excessive or insufficient depending on nozzle arrangement, causing black or white stripes
Solution Approach 1:
The patent applies local quality by determining different correction coefficients for different nozzles based on their specific landing interference patterns. Instead of using a uniform correction coefficient for all nozzles, the system calculates customized correction coefficients for each nozzle according to its position, adjacent nozzles, and resulting interference patterns, thereby achieving precise local correction and eliminating stripes.
2Device complexity
If ejection failure correction is performed without considering landing interference, then the correction process is simpler, but visible stripes appear due to unaccounted depositing position and dot diameter errors
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing correction coefficients for various landing interference patterns before actual image formation. The system determines correction coefficients in advance based on nozzle arrangement and interference patterns, then retrieves the appropriate pre-calculated coefficients during correction processing, avoiding the need for complex real-time calculations while eliminating visible stripes.
3Device complexity
If correction is performed without considering deposition sequence, then the correction model is simpler, but landing interference effects are not accounted for leading to insufficient correction
Solution Approach 1:
The patent applies segmentation by dividing the correction model into distinct components: deposition sequence determination, landing interference pattern identification, and correction coefficient selection. The system segments the correction process into manageable stages where each stage handles a specific aspect of the correction problem, making the overall model more reliable while keeping each segment relatively simple.
Data Source
AI summary
An image processing method of creating image data for forming an image on a recording medium by ejecting liquid droplets from a plurality of nozzles of a recording head onto the recording medium while causing relative movement of the recording medium and the recording head, includes: a correction coefficient storage step of determining correction coefficients for ejection failure correction based on difference of landing interference patterns of a plurality of types, and storing the correction coefficients for ejection failure correction according to the landing interference patterns, in a storage unit; an ejection failure nozzle position information acquisition step of acquiring ejection failure nozzle position information and a correction processing step of performing a correction calculation on input image data using a corresponding correction coefficient obtained by referring to the correction coefficients for ejection failure correction according to the ejection failure nozzle position information.