Document Measurement and Designation Images for Large Sheet Alignment
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Solution Overview
Problem
Existing image forming apparatuses face challenges in accurately reading and processing large-size sheets of paper, as they often struggle to align and correct for the position and magnification of images across the paper's surface, leading to potential reading failures and errors in calculating correction amounts.
Innovation Solution
The apparatus incorporates a system where measurement and designation images are formed on the document, allowing it to be precisely aligned within the reading region, using chart images with detection, alignment, and identification marks to ensure accurate positioning and reading, even for large-size sheets, by using a combination of alignment images and a black background to clearly define the paper's edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the reading region is enlarged to accommodate large-size sheets, then the coverage area is improved, but the alignment precision and measurement accuracy deteriorate
Solution Approach 1:
The patent divides the reading region into multiple sub-regions, with each sub-region containing its own measurement image and designation image. This segmentation allows the system to maintain precise alignment and measurement within each smaller region while collectively covering a large document area, resolving the contradiction between large coverage and precise measurement.
Solution Approach 2:
The patent introduces measurement images and designation images as intermediary elements between the document and the reading region boundaries. These intermediary markers enable the system to accurately determine the document's position and dimensions relative to the reading region, maintaining measurement precision even when the reading region is enlarged.
2Adaptability or versatility
If the document size is increased, then the processing capability is improved, but the alignment and position correction difficulty increases
Solution Approach 1:
The patent incorporates measurement images and designation images into the document before it enters the reading region. These pre-placed markers enable the image reading apparatus to automatically detect and calculate position correction amounts in advance, simplifying the alignment process for large documents and reducing the difficulty of position correction.
Solution Approach 2:
The patent replaces manual alignment methods with an automated optical measurement system. By using measurement images with detection marks and designation images with identification marks, the system automatically calculates position correction amounts through image processing, eliminating the need for manual alignment and reducing the difficulty of measuring large documents.
3Measurement precision
If the measurement image is placed within the reading region, then the reading accuracy is improved, but the designation image placement flexibility is reduced
Solution Approach 1:
The patent segments the document into multiple regions, placing measurement images within the reading region for accurate reading while positioning designation images in designated areas outside the reading region. This segmentation allows both requirements to be satisfied simultaneously: measurement images within the reading region for high reading accuracy, and designation images in flexible locations for proper document identification and positioning.
Data Source
AI summary
There is provided a document, wherein a measurement image for measuring a position of an image relative to a document is formed on a first surface thereof, a designation image for designating a document position, at which the document is placed on an image reading apparatus that reads an image, is formed on a second surface thereof, and wherein the document is spaced from an end portion of a reading region of the image reading apparatus by placing the document in accordance with the designation of the designation image, and the designation image is formed such that the measurement image is placed in the reading region of the image reading apparatus.