Inkjet Tone Correction for Edge Region Bleeding
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Solution Overview
Problem
Inkjet printing apparatuses face challenges in maintaining image quality when printing images with varying pixel sizes on the print medium, leading to bleeding and blurring of lines and characters.
Innovation Solution
A printing apparatus with a print head, detection unit for edge and non-edge regions, and a tone correction unit that adjusts the printing agent application amount based on the region type, capable of operating in two printing modes with different input resolutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform tone correction is applied to edge and non-edge regions in images with varying pixel sizes, then the processing is simple, but image quality degrades with discontinuous lines and characters
Solution Approach 1:
The patent applies different tone correction strategies to edge regions versus non-edge regions. Edge pixels receive reduced application amounts to prevent bleeding, while non-edge pixels receive standard application amounts to maintain continuity. This local differentiation resolves the contradiction by adapting the correction approach to local image characteristics rather than applying a uniform simple process.
Solution Approach 2:
The system dynamically adjusts the tone correction parameters based on the detected printing mode (first mode with lower input resolution or second mode with higher input resolution). The detection unit identifies edge regions, and the tone correction unit adapts its behavior accordingly, making the processing dynamic rather than static to handle varying pixel sizes and printing conditions.
2Manufacturing precision
If edge pixels receive reduced application amount to prevent bleeding, then image quality improves, but lines and characters become discontinuous in high-resolution printing modes
Solution Approach 1:
The system dynamically adjusts tone correction parameters based on printing mode. In the first printing mode (lower input resolution), edge pixels receive reduced application amounts to prevent bleeding. In the second printing mode (higher input resolution), edge pixels receive increased application amounts to maintain continuity. This dynamic adaptation resolves the contradiction by considering the specific printing conditions.
Solution Approach 2:
The patent changes the application amount parameter for edge pixels based on the detected printing mode. The tone correction unit sets different application amounts for edge pixels in different printing modes, allowing the system to optimize between bleeding prevention and continuity maintenance according to the specific printing conditions.
3Stability of the object's composition
If the application amount for edge regions is increased in high-resolution mode, then line continuity improves, but bleeding and blurring worsen
Solution Approach 1:
The system changes the application amount parameter dynamically based on printing mode detection. In the first printing mode (lower resolution), the parameter is set to reduce application amounts for edge pixels to prevent bleeding. In the second printing mode (higher resolution), the parameter is set to increase application amounts for edge pixels to ensure continuity. This parameter adaptation resolves the contradiction by optimizing for the specific printing conditions.
Data Source
AI summary
An object of the present disclosure is to avoid degradation of image quality. An embodiment of the present invention is a printing apparatus including: a print head; a detection unit configured to detect an edge region and a non-edge region of an object in image data; and a tone correction unit configured to adjust an application amount of a printing agent for a unit region based on whether the unit region is the edge region or the non-edge region, in which the printing apparatus is capable of performing printing in a first printing mode or a second printing mode, in the first printing mode, an input resolution of the image data is lower than a printing resolution of the print head, in the second printing mode, the input resolution of the image data is higher than or equal to the printing resolution of the print head.