Image Reading Carrier-Sheet Detection Through Binary Window Sizing
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Solution Overview
Problem
Image reading apparatuses struggle to accurately identify carrier sheets due to shadows appearing inside holes, leading to incorrect recognition of the carrier sheet's color and position, which affects the detection process.
Innovation Solution
The apparatus includes a transport section for carrier sheets with a junction having windows that transmit light, and a controller performs window height and width detection processes based on binary image data generated through binarization, ensuring accurate detection of the carrier sheet by determining if the window dimensions fall within specified ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the carrier sheet is read using a light source and image sensor, then the carrier sheet can be identified, but shadows appear inside the holes leading to incorrect color recognition and detection failure
Solution Approach 1:
The patent applies preliminary action by performing binarization processing on the image data before detecting the window dimensions. This preprocessing step converts the image to binary form, separating the window area from shadow areas and other interference, thereby eliminating shadow effects before the actual measurement process begins
Solution Approach 2:
The patent utilizes color changes by converting the predetermined color (representing the window) into a first color and other colors into a second color through binarization. This color transformation allows the detection system to distinguish the window area from shadow areas based on color differences, effectively eliminating shadow interference from the detection process
2Measurement precision
If the window detection is performed on binary image data with binarization, then shadow impact is minimized, but the detection process becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the detection process into distinct stages: binarization processing to create binary image data, followed by separate window height detection and window width detection processes. This segmentation allows each step to focus on a specific task, making the overall complex process more manageable and systematic
3Adaptability or versatility
If the carrier sheet position varies during transport, then the reading process can accommodate different positions, but shadows appear affecting detection accuracy
Solution Approach 1:
The patent applies parameter changes by using binarization to transform the image data parameters, converting color information into binary values. This parameter transformation makes the detection process insensitive to position variations and shadow effects, as the binary representation focuses only on the presence or absence of the predetermined color rather than its intensity or position
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 method enhances the accuracy of carrier sheet detection by minimizing the impact of shadows, reducing errors in identifying the carrier sheet's position and type.
Implementation Method 1
The junction has a window that transmits light
Data Source
AI summary
An image reading apparatus is configured to read image data generated by reading a window within a junction of a carrier sheet and then to determine whether the target object is a carrier sheet, based on a total height of a first area and a plurality of second areas arranged with the first area therebetween in a transport direction as well as a first color width. In the first area, pixels in a second color are sequentially arrayed in the transport direction; in the second areas, pixels in a first color are sequentially arrayed in the transport direction; and the first color width indicates a length of an area in which a plurality of pixels in the first color are sequentially arrayed in a width direction.