Adaptive Special-Toner Screen Determination for Moire Prevention
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Solution Overview
Problem
Conventional image forming devices fail to optimize the superimposition of special toner screens on multiple process-color toner screens, leading to unexpected moire and uneven glossiness in halftone modes, which results in image outputs not aligning with the intended purpose.
Innovation Solution
An image processing device that determines the type of gradation process for both process-color and special toner plates based on halftone mode information, using a first gradation-process determining unit for process-color toner plates and a second unit for special toner plates, and performs halftone processing accordingly to ensure optimal superimposition and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional image forming devices use fixed screen superimposition for special toner and process-color toner, then device complexity is reduced, but image quality deteriorates due to moire and uneven glossiness
Solution Approach 1:
The patent applies dynamics by making the screen parameters (lines per inch, screen angle) adjustable and adaptive rather than fixed. The halftone processing unit dynamically determines optimal screen parameters for special toner based on the process-color toner screen parameters and halftone mode, allowing the system to adapt to different printing conditions and prevent moire while maintaining manageable complexity through automated determination.
2Manufacturing precision
If the special toner screen uses a large number of lines to reduce moire, then image quality improves, but productivity decreases due to increased processing time
Solution Approach 1:
The patent applies preliminary action by pre-establishing correspondence relationships between process-color toner screen parameters and optimal special toner screen parameters for different halftone modes. The system determines the special toner screen parameters in advance based on the selected halftone mode and process-color screen, rather than performing complex iterative optimization during processing, thus improving image quality while maintaining processing efficiency.
3Manufacturing precision
If conventional devices apply the same gradation process to both process-color and special toner, then device complexity is reduced, but image quality deteriorates due to unstable superimposition
Solution Approach 1:
The patent applies local quality by determining gradation processes separately for process-color toner and special toner based on their different characteristics and requirements. The first gradation-process determining unit handles process-color toner while the second gradation-process determining unit handles special toner, allowing each to have optimized local processing parameters that ensure stable superimposition and high image quality.
Data Source
AI summary
An image processing device includes: a first gradation-process determining unit that determines a type of gradation process for a process-color toner plate in accordance with halftone mode information; a second gradation-process determining unit that determines a type of gradation process for a special toner plate other than a process color in accordance with the type of gradation process determined by the first gradation-process determining unit; and a halftone processing unit that performs halftone processes in accordance with the types of gradation processes that are determined by the first gradation-process determining unit and the second gradation-process determining unit.