Image Reading Apparatus Skew Compensation via Dual Sensor Feedback
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Solution Overview
Problem
Image reading apparatuses face challenges in reliably imaging skewed or slipping media, leading to increased processing loads and incomplete images due to the need for simultaneous conveyance and imaging, which existing technologies fail to address effectively.
Innovation Solution
The apparatus includes a separation roller, imaging device, conveyance roller, first and second medium sensors, and a processor that starts imaging based on the first sensor's detection and generates a cutout image based on the second sensor's detection, ensuring the entire medium is imaged even when tilted or slipping occurs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If imaging starts simultaneously with conveyance to reliably image skewed media, then imaging reliability is improved, but blank parts increase and processing load increases
Solution Approach 1:
The system performs preliminary detection of the medium's position and conveyance state using sensors before completing the imaging process. Based on this preliminary information, the system dynamically adjusts imaging parameters and processing to compensate for skew and slipping, eliminating blank parts without compromising imaging reliability
Solution Approach 2:
The system uses medium sensors to detect the actual position and movement of the medium during conveyance, then feeds this information back to adjust imaging parameters and processing in real-time. This feedback mechanism allows the system to maintain imaging reliability while minimizing blank parts by adapting to actual medium behavior
2Reliability
If imaging starts simultaneously with conveyance to handle skewed media, then imaging reliability is improved, but processing load increases
Solution Approach 1:
The system performs preliminary detection and calculation of medium position and conveyance characteristics before full imaging processing. By pre-calculating correction parameters based on initial sensor data, the system reduces the computational burden during main processing while maintaining imaging reliability for skewed media
Solution Approach 2:
The system uses sensor feedback to detect medium conveyance state and dynamically adjusts processing requirements. By monitoring actual medium behavior and adapting processing accordingly, the system maintains imaging reliability while minimizing unnecessary processing load
3Measurement precision
If cutout image is generated based on second sensor detection position, then accuracy is improved, but skew handling capability deteriorates
Solution Approach 1:
The system uses feedback from multiple sensors to detect both the precise position and the conveyance state (including skew) of the medium. This feedback information is used to dynamically adjust the cutout generation process, maintaining position accuracy while adapting to skewed media through real-time parameter adjustment
Data Source
AI summary
The image reading apparatus includes a separation roller, an imaging device to generate an input image, a conveyance roller to convey the medium separated by the separation roller to the imaging device, a first medium sensor located between the separation roller and the conveyance roller, a second medium sensor located between the conveyance roller and the imaging device, a processor to start imaging by the imaging device in response to detection of the medium by the first medium sensor and generate a cutout image from the input image in response to detection of the medium by the second medium sensor, and an output device to output the cutout image. The processor generates the cutout image based on a position imaged by a predetermined amount before a position imaged at a timing when the second medium sensor detects the medium, in the input image.