Parallel Document Image Tilt Correction via Shaper Reference
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Solution Overview
Problem
Existing document reading devices face complexity in handling tilted documents during simultaneous reading of both sides, requiring mechanical mechanisms and sensors, which complicates the configuration and processing.
Innovation Solution
A document reading device with a conveyor system, first and second readers, and shapers that correct image tilts using shaping processing, where the second shaper uses information from the first shaper's processing to correct the second image, and adjusts conveyance speed and resolution based on document size, without needing mechanical tilt correction mechanisms or orientation sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mechanical mechanism is used to correct document tilt, then tilt correction is achieved, but device complexity increases due to additional mechanical components and sensors
Solution Approach 1:
The patent replaces mechanical tilt correction mechanisms with image processing methods. The reading unit reads images at multiple positions, and the image processing unit corrects tilt through software algorithms, eliminating the need for mechanical correction devices and orientation sensors.
Solution Approach 2:
The patent reads the same document at multiple positions (front side and back side) to create multiple image copies. By processing these copies together, the system can correct tilt more effectively while maintaining simple hardware configuration.
2Manufacturing precision
If tilt correction is performed on both sides separately, then accurate correction is achieved, but processing complexity increases
Solution Approach 1:
The patent merges the processing of front side and back side images by using the front side image as a reference for correcting the back side image. This unified approach reduces processing complexity while maintaining correction accuracy for both sides.
Solution Approach 2:
The patent performs preliminary processing on the front side image first, then uses the results to guide the correction of the back side image. This sequential approach with preliminary action simplifies the overall processing while achieving accurate tilt correction for both sides.
3Adaptability or versatility
If reading area is increased to accommodate tilted documents, then all documents are captured, but processing load increases
Solution Approach 1:
The patent applies different processing approaches to different regions of the read images. By identifying the actual document boundaries within the larger reading area and applying targeted processing only to relevant regions, the system maintains adaptability to various document sizes while reducing unnecessary processing load.
Data Source
AI summary
The multifunction peripheral of the present invention includes an ADF document crop function. According to this ADF document crop function, front side image shaping processing for cutting out a front side document image corresponding to the image on the front side of a document, from a front side read image of the document and for correcting the tilt of the front side document image is performed. Then, on the basis of shaping information in the front side image shaping processing, back side image shaping processing for cutting out a back side document image from a back side read image of the document and for correcting the tilt of the back side document image is performed.