Inkjet Printhead Stitching via Image-Adaptive Boundaries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing digital printing systems with multiple jetting modules face challenges in aligning image data across different printheads, leading to visible artifacts due to manufacturing tolerances and environmental interactions, which traditional methods struggle to accurately correct.
Innovation Solution
A method for inkjet printing that involves analyzing image data in overlap regions to define hard and soft-stitch boundaries, distributing stitching errors over a larger area, and using fading functions to transition between printheads, especially in regions with white pixels to minimize visibility of stitch artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional stitching methods are used to align image data across multiple jetting modules, then manufacturing tolerances and environmental interactions cause alignment errors, but visible stitch artifacts appear in the printed image
Solution Approach 1:
The patent applies different stitching strategies to different regions of the image based on local characteristics. In overlap regions with white pixels, a hard stitch boundary is defined to completely avoid the artifact region. In overlap regions without white pixels, a soft-stitching fading function is applied to gradually transition between printheads. This local differentiation resolves the contradiction by adapting the stitching method to the specific local conditions of each region.
Solution Approach 2:
The patent segments the overlap region into different zones based on the presence of white pixels. By analyzing each pixel's color information and categorizing regions as either containing white pixels or not, the system can apply appropriate stitching methods to each segment. This segmentation allows the system to target artifact-prone areas specifically while preserving image quality in other regions.
2Manufacturing precision
If a hard stitch boundary is defined in all regions, then alignment precision is improved, but visibility of stitch artifacts increases in non-white regions
Solution Approach 1:
The patent makes the stitch boundary characteristics variable based on local image content. In regions with white pixels, the boundary is hard and complete. In regions without white pixels, the boundary becomes soft and gradual through the fading function. This local adaptation resolves the contradiction by optimizing the boundary type for each specific region's characteristics.
Solution Approach 2:
The patent introduces dynamic adjustment of the stitch boundary properties based on real-time analysis of image data. The system evaluates each pixel's color information and dynamically switches between hard boundary and soft fading boundary modes. This dynamic behavior allows the system to respond to local conditions and minimize artifact visibility while maintaining alignment precision.
3Productivity
If multiple jetting modules are used to increase printing width, then productivity is improved, but alignment errors between modules cause visible artifacts
Solution Approach 1:
The patent introduces an intermediate processing step that analyzes image data in overlap regions and determines optimal stitching parameters. This intermediary analysis layer sits between the multiple jetting modules and the final printed output, evaluating local image characteristics and adjusting stitch boundaries or fading functions accordingly. This intermediary process resolves alignment errors caused by manufacturing tolerances and environmental interactions, enabling multiple modules to work together with high precision.
Data Source
AI summary
A method of printing on an inkjet printer including a plurality of overlapping jetting modules includes analyzing image data within a stitch area to designate white pixels and non-white pixels. For rows where the stitch area includes white pixels, a hard stitch boundary is defined within the stitch area where image pixels to the left of the hard stitch boundary are to be printed using a left jetting module and image pixels to the right of the hard stitch boundary are to be printed using a right jetting module. For image regions where the rows of image pixels within the stitch area include only non-white pixels, a soft-stitching path is defined through the image region, and a fading function is used to gradually transition from printing image pixels with the left jetting module to printing image pixels with the right jetting module in a transition zone around the soft-stitching path.