Halftone Image Merge Line Optimization for Recording Heads
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Solution Overview
Problem
Existing recording technologies face challenges in merging sub-images without artifacts, particularly due to misalignments between image pixel arrangements, which can result in banding and other visual distortions, making it difficult to produce high-quality images with reduced artifacts.
Innovation Solution
A method for forming halftone images on recording media involves using a recording head with individually addressable channels to form image swaths during separate scans, identifying optimal merge locations based on sub-scan misalignment, and merging image swaths at those locations to minimize visual artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple image swaths are merged to increase productivity, then output per time is improved, but visual artifacts such as banding appear due to misalignment
Solution Approach 1:
The patent calculates and stores optimal merge line locations in advance for different halftone screen parameters (screen ruling, screen angle, dot shape) before actual image formation. This preliminary computation enables the system to quickly select pre-determined optimal merge locations during operation, avoiding real-time complex calculations while ensuring artifact reduction is achieved.
Solution Approach 2:
The patent applies different merge line offset values at different locations within the unit cell based on the halftone screen configuration. By locally optimizing the merge line position within each unit cell rather than using a uniform offset across the entire image, the system minimizes stitching artifacts at critical locations while maintaining overall image quality and productivity.
2Manufacturing precision
If merge line offset is adjusted to reduce artifacts, then image quality is improved, but the complexity of the merging process increases
Solution Approach 1:
The system pre-calculates optimal merge line offsets for various halftone screen configurations and stores them in lookup tables. During actual operation, the system simply retrieves the appropriate offset value based on the current screen parameters, transforming a complex real-time optimization problem into a simple table lookup operation.
Solution Approach 2:
The patent systematically varies the merge line offset parameter within the unit cell to find optimal values that minimize artifacts for different halftone screen configurations. By treating the offset as a可调 parameter and establishing relationships between screen parameters and optimal offsets, the system manages complexity through parameterization rather than complex algorithms.
3Productivity
If recording head has more channels to increase productivity, then output per time is improved, but misalignment between sub-images increases causing more artifacts
Solution Approach 1:
The patent pre-determines optimal merge line locations that account for potential misalignments that may occur with multi-channel recording heads. By calculating these optimal locations in advance based on unit cell geometry and screen parameters, the system compensates for alignment issues before they manifest as visible artifacts.
Solution Approach 2:
The patent introduces the unit cell as an intermediary structure that mediates between multiple image swaths. By confining the merging operation within the boundaries of unit cells and carefully selecting merge line locations within these cells, the system provides a structured framework that reduces the impact of misalignments between channels.
Data Source
AI summary
A method for forming a halftone image on recording media includes providing a recording head comprising a plurality of individually addressable recording channels. The recording head forms a plurality of image swaths, with each swath formed during a separate scan. A plurality of locations is identified within a representative unit cell of the halftone image. A quantified value for each location is determined based on a sub-scan misalignment associated with a proposed merging of two image swaths at the location corresponding to the quantified value. A merge location is selected from the plurality of locations, corresponding to a desired quantified values. The recording head forms the halftone image on the recording media while merging a first image swath and a second image swath at the selected merge location within a first unit cell of the halftone image.