True Black Pixel Placement for High-Resolution Text Print Quality
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Solution Overview
Problem
Existing high-resolution printing techniques, such as error diffusion algorithms, often produce visually noticeable artifacts like patches of regular structure and uneven transitions between structured and unstructured areas, which are undesirable in text print quality, especially in high-resolution modes.
Innovation Solution
A method for high-resolution printing that determines if a pixel is a true black pixel and positions it in predetermined columns and rows, using a half-toning technique to place true black pixels consistently, thereby improving text print quality and reducing the number of scans required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If error diffusion algorithms are used for high-resolution printing, then the dot structure is finely dispersed, but visually noticeable artifacts and uneven transitions appear
Solution Approach 1:
The patent applies preliminary action by pre-determining the placement of true black pixels in a buffer memory before the actual printing scan. This allows the system to plan and optimize dot placement in advance, avoiding the artifacts caused by real-time error diffusion calculations while maintaining fine dispersion. The buffer stores predetermined pixel locations that are then printed in a single scan, eliminating the harmful artifacts associated with traditional error diffusion methods.
2Manufacturing precision
If multiple scans are used to print high-resolution images, then dot placement flexibility is improved, but printing time and complexity increase
Solution Approach 1:
The patent uses preliminary action by calculating and storing all true black pixel positions in a buffer memory before printing begins. This pre-computation allows the system to execute a single scanning pass with all necessary dot placement information already prepared, eliminating the need for multiple scans while maintaining precise dot placement flexibility. The buffer acts as a pre-planned map that guides the single-scan printing process.
Solution Approach 2:
The patent merges multiple scanning operations into a single scan by consolidating all true black pixel placement decisions into one printing pass. Instead of performing separate scans for different dot types or positions, the system combines all necessary information into a unified buffer that directs a single comprehensive scan, thereby improving printing speed without sacrificing placement precision.
3Manufacturing precision
If true black pixels are printed in multiple scans, then ink saturation is reduced, but bleeding effect increases and text quality deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-determining and buffering all true black pixel positions before the printing scan. This allows the system to print all true black pixels in a single scan with consistent ink saturation, preventing the bleeding that occurs when ink is applied in multiple passes. The pre-computed buffer ensures that all black text elements are deposited simultaneously, maintaining sharp edges and preventing the smearing associated with multi-scan approaches.
Data Source
AI summary
A high-resolution printing method includes the steps of determining if a pixel of a plurality of pixels is a true black pixel and positioning the true black pixel in a predetermined column and a predetermined row of a print matrix.