Image Position Correction Using Orientation-Independent Test Marks
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Solution Overview
Problem
Image forming apparatuses face challenges in accurately correcting the position of images on recording media due to positional deviations, which can be exacerbated by the complexity of specifying the position of correction codes on test images, especially when the test paper is oriented in various directions.
Innovation Solution
The apparatus includes a test image with specific marks and a code image that provides information for correction, where the marks are positioned relative to reference lines on the paper, allowing the control unit to easily specify the code image's position regardless of the paper's orientation, thereby simplifying the correction process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the test image includes complex positioning marks and code images to enable accurate correction, then the image position correction precision is improved, but the device complexity increases due to the need to specify positions of multiple marks and codes regardless of paper orientation
Solution Approach 1:
The test image is segmented into distinct functional components: a first mark for reference line detection, a second mark for orientation identification, and a code image for correction data. This segmentation allows each element to serve its specific function independently, simplifying the overall positioning process despite the multiple components involved.
Solution Approach 2:
The first and second marks act as intermediary elements that mediate between the paper orientation and the code image position. By detecting these marks first, the system can automatically determine paper orientation and locate the code image without requiring complex manual specification, thus reducing device complexity while maintaining correction precision.
2Reliability
If multiple marks and code images are included in the test image for accurate correction, then the reliability of image correction is improved, but the ease of operation deteriorates due to the increased processing burden of specifying code image positions
Solution Approach 1:
The test image is designed to be self-sufficient for positioning purposes. The first mark enables automatic detection of the reference line, the second mark provides orientation information, and together they allow the system to automatically locate the code image without user intervention. This self-service mechanism improves ease of operation while maintaining correction reliability through multiple reference points.
Solution Approach 2:
The marks are positioned in advance at predetermined locations relative to the reference line and paper edges. This preliminary positioning of reference marks enables the system to automatically determine paper orientation and code image location before correction processing begins, reducing operational burden while ensuring reliable correction through pre-established reference framework.
3Measurement precision
If the code image position is determined relative to marks at predetermined distances from reference lines, then the measurement precision of code image position is improved, but the device complexity increases due to the need for precise mark positioning
Solution Approach 1:
The first and second marks serve multiple functions: they establish reference frames for position measurement, indicate paper orientation, and enable automatic code image location. This multi-functionality reduces the need for separate positioning mechanisms, thereby reducing device complexity while maintaining high measurement precision through the universal reference framework provided by these marks.
Data Source
AI summary
Provided is an image forming apparatus, including an image forming unit that forms a test image for correction of a position of an image on the recording medium, a reading unit that reads an image from the recording medium on which the test image is formed, a transport unit that transports the recording medium, and a correction unit that corrects the position of the image, wherein the test image includes a first mark that is provided at a distance determined from the first reference line, a second mark that is provided at the distance from a second reference line set with respect to a second side, and a code image that is provided at a position determined with respect to the first mark and the second mark, and that indicates information for correction of the position of the image by the correction unit.