Toner Consumption Prediction in Dithered Image Forming Apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for calculating toner consumption in electrophotographic image forming apparatuses, such as printers and copiers, face accuracy issues when dithering is performed due to the inability to account for the decrease in toner consumption caused by smaller dots in halftone processing, particularly in areas with small area ratios.
Innovation Solution
The method involves using a pixel counting unit to count OFF pixel groups and ON pixel groups with varying consecutive numbers, combined with the size of the dither matrix, to accurately predict toner consumption by applying correction coefficients based on these counts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If dithering is performed as halftone processing on an input image, then the image quality is improved, but the accuracy of predicting the toner consumption amount drops
Solution Approach 1:
The patent segments the image into multiple pixel groups based on the dithering matrix pattern, analyzing each segment's contribution to toner consumption. By dividing the image processing into discrete segments corresponding to dithering cells, the system can accurately track and predict toner usage even when dithering creates varying dot sizes and distributions.
Solution Approach 2:
The patent changes the parameters used for toner consumption calculation from simple dot counts to a more sophisticated model that considers dithering matrix size, pixel group configurations, and their relationships. This parameter transformation allows accurate prediction despite the non-linear toner consumption patterns introduced by dithering.
2Device complexity
If simple dot counting is used to calculate toner consumption, then the calculation is simple, but the accuracy drops when dithering is applied due to non-linear toner adhesion
Solution Approach 1:
The patent introduces an intermediary calculation model that bridges simple dot counting and complex physical toner adhesion measurements. By using pixel group patterns and dithering matrix characteristics as intermediaries, the system translates simple countable data into accurate toner consumption predictions without requiring complex physical measurements.
Solution Approach 2:
The patent transforms the calculation parameters from basic dot counts to a multi-factor model incorporating dithering matrix dimensions, pixel group consecutive numbers, and pattern frequencies. This parameter evolution maintains computational simplicity while dramatically improving prediction accuracy for dithered images.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy of toner consumption prediction by correcting for the underestimation of toner consumption in dithered images, reducing the mean absolute error and improving overall prediction accuracy.
Implementation Method 1
an exposure unit configured to form an electrostatic latent image on the photosensitive member by exposing the photosensitive member on the basis of the image signal
Implementation Method 2
a developing unit configured to form a developer image on the photosensitive member by developing the electrostatic latent image using a developer
Data Source
AI summary
In an image forming apparatus, a processing unit generates an image signal by performing dithering as halftone processing on an input image. A control unit obtain a consumption amount of a developer for forming a developer image, on the basis of the image signal. The control unit obtains the consumption amount using (i) a count value obtained by individually counting OFF pixel groups included in an image corresponding to the image signal, each OFF pixel group being constituted by consecutive OFF pixels and having a different consecutive number of consecutive OFF pixels, and (ii) a size of a dither matrix used in the dithering.