Perforated Sheet Image Processing With Error Diffusion Control
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Solution Overview
Problem
Conventional image forming apparatuses experience image defects when forming toner images on perforated sheets due to issues like unintended electric discharge and disordering of dot arrangements.
Innovation Solution
The image forming apparatus is equipped with a controller that switches from AM screen processing to error diffusion processing for perforated sheets to mitigate image defects, using a controller to control the image processing portion to perform error diffusion processing on image data when forming images on perforated sheets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AM screen processing is used for perforated sheets, then image formation is achieved, but image defects occur due to unintended electric discharge and dot arrangement disorders
Solution Approach 1:
The patent changes the image processing parameter from AM screen processing to error diffusion processing specifically for perforated sheets. This parameter change eliminates the harmful electric discharge and dot arrangement disorders that occur with AM screen processing on perforated materials, while maintaining image formation capability.
2Reliability
If error diffusion processing is used instead of AM screen processing, then image defects are reduced, but processing complexity increases
Solution Approach 1:
The patent implements dynamic selection of processing methods based on sheet type. The system automatically detects whether the sheet is perforated and switches between AM screen processing and error diffusion processing accordingly. This dynamic approach reduces processing complexity by applying the simpler AM screen processing to non-perforated sheets while using error diffusion only when necessary for perforated sheets.
Data Source
AI summary
An image forming apparatus capable of forming an image on a perforated sheet includes an image forming portion for forming a toner image on a sheet, an image processing portion for performing image processing, on acquired image data, of at least either one of screen processing and error diffusion processing, and a controller for controlling the image processing portion to form the toner image on the basis of the image data processed by the image processing portion. In a case that the sheet on which the toner image is to be formed is the perforated sheet, the image processing portion performs the error diffusion processing on the acquired image data.