Density Acquisition Assistance for Image Forming Apparatus
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Solution Overview
Problem
In image forming apparatuses, existing methods require multiple lookup tables for gradation correction, leading to differing density estimation needs based on control modes, necessitating a method for the second controller to assist the first controller in acquiring necessary densities efficiently without forming test images.
Innovation Solution
An image forming apparatus with a first control unit for density correction and an image forming unit, where the first control unit specifies density correction information to a second control unit, which acquires parameters to estimate multiple image densities based on tone levels and transmits them back for LUT correction, reducing toner consumption and downtime by avoiding test image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If test images are formed to acquire density data for lookup table correction, then measurement precision is improved, but loss of substance (toner consumption) increases
Solution Approach 1:
The patent uses image data from previously formed images as a copy substitute for actual test images. The density estimation unit calculates density values from stored image data without requiring physical test image formation, thereby eliminating toner consumption while obtaining necessary density information for lookup table correction.
Solution Approach 2:
The system performs preliminary density estimation using stored image data before actual test image formation. By calculating density values in advance from existing image data, the system prepares the necessary correction information without consuming additional toner on test images.
2Measurement precision
If test images are formed to acquire density data for lookup table correction, then measurement precision is improved, but loss of time (downtime) increases
Solution Approach 1:
The patent retrieves and processes image data from previously formed images instead of forming new test images. This copying approach eliminates the time required for test image formation, processing, and measurement, thereby reducing downtime while maintaining density measurement capabilities through data calculation.
Solution Approach 2:
The system performs density estimation using stored image data before downtime occurs. By preparing density values in advance from existing data, the system avoids the time loss associated with forming and measuring test images during correction operations.
3Adaptability or versatility
If multiple lookup tables are used for different control modes, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent creates a single lookup table that serves multiple control modes (image processing mode and control mode). The density estimation unit provides mode-specific density values from the same lookup table structure, allowing one table to fulfill multiple functions rather than requiring separate tables for each mode.
Solution Approach 2:
The system adjusts density parameters within a single lookup table based on control mode requirements. The density estimation unit calculates appropriate density values for different modes by changing the estimation parameters, allowing the same lookup table to adapt to different control modes without requiring separate tables.
Data Source
AI summary
An apparatus comprising a first control unit that executes density correction processing on image data and generates an image signal, an image forming unit that forms an image on a recording medium on the basis of the image signal, and a second control unit that controls the image forming unit. The first control unit includes a specifying unit that transmits specifying information relating to the density correction processing to the second control unit. The second control unit includes an acquisition unit that acquires a parameter relating to the image forming apparatus, and an estimation unit that estimates a plurality of image densities corresponding to tone levels identified by the specifying information transmitted from the first control unit on the basis of the parameter acquired by the acquisition unit and transmits the plurality of image densities to the first control unit.