Image Processing Apparatus Dynamic Color Conversion Table Selection
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Solution Overview
Problem
The variable peripheral speed ratio between the photoconductive drum and the developing roller in electrophotographic image formation apparatuses affects toner supply, leading to changes in image density and color gamut, making it difficult to maintain consistent output across different speed ratios.
Innovation Solution
An image formation apparatus that includes an obtaining unit to determine the rotation speeds of the photoconductive drum and developing roller, and a determination unit to select a color conversion table based on these speeds, ensuring consistent image output by adjusting the color conversion process accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the peripheral speed ratio between the photoconductive drum and the developing roller is varied to extend color gamut, then the color gamut is extended, but the image density changes and color consistency deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the color conversion table based on the peripheral speed ratio between the photoconductive drum and developing roller. When the peripheral speed ratio changes to extend color gamut, the system selects different color conversion tables to compensate for the resulting density changes, thereby maintaining image density consistency while preserving extended color gamut.
Solution Approach 2:
The system implements feedback by detecting the actual peripheral speed ratio and using this information to select the appropriate color conversion table. This feedback mechanism ensures that the color conversion process adapts to the actual operating conditions, maintaining consistent image output regardless of the peripheral speed ratio used for color gamut extension.
2Adaptability or versatility
If the peripheral speed ratio is changed to extend color gamut, then more colors become reproducible, but the toner supply amount changes causing color inconsistency
Solution Approach 1:
The patent uses parameter changes by selecting different color conversion tables corresponding to different peripheral speed ratios. This allows the system to maintain reliable color consistency even when the peripheral speed ratio is changed to extend color reproduction capability, as the color conversion table is adjusted to compensate for toner supply variations.
Solution Approach 2:
The system performs preliminary action by pre-preparing multiple color conversion tables for different peripheral speed ratios before actual image formation. This allows the system to proactively adjust the color conversion parameters based on the planned peripheral speed ratio, preventing color inconsistency before it occurs.
3Device complexity
If a fixed color conversion table is used regardless of peripheral speed ratio, then the processing is simple, but the image output becomes inconsistent across different speed ratios
Solution Approach 1:
The patent applies dynamics by transitioning from a fixed color conversion table to a dynamic selection system that adapts to the peripheral speed ratio. The system determines which color conversion table to use based on the actual peripheral speed ratio, making the color conversion process dynamic and adaptive rather than static and fixed, thereby ensuring consistent image output.
Solution Approach 2:
The system performs preliminary action by pre-organizing multiple color conversion tables in advance, ready for selection based on the peripheral speed ratio. This preliminary preparation allows the system to quickly and accurately select the appropriate table without adding significant processing complexity during actual image formation.
Data Source
AI summary
An image formation apparatus includes an image bearing member on which an electrostatic latent image is formed and a developing agent bearing member configured to carry a developer used to develop the electrostatic latent image formed on the image bearing member. The image formation apparatus forms an image by using the electrostatic latent image formed on the image bearing member. The image formation apparatus further includes an obtaining unit configured to obtain the information about a rotation speed of the image bearing member and a rotation speed of the developing agent bearing member; a determination unit configured to determine, according to the obtained information, a color conversion table used to transfer and record the input image data; and an image formation unit configured to convert a signal of the input image data according to the determined color conversion table and form an image with the converted signal value.