Reading Device Carriage Skew Correction via Flat Gauge
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing reading devices face challenges in accurately measuring object dimensions due to carriage skewing during scanning, which results in distorted images and reduced measurement precision.
Innovation Solution
A reading device with a carriage that moves in the sub-scanning direction, equipped with an optical sensor and a reference scale, uses a flat gauge to calculate a corrective value for image correction, allowing for precise measurement of object dimensions by aligning the reference scale outside the image acquisition range and the flat gauge within it, with multiple reference lines oriented in the main and sub-scanning directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the carriage moves along the contact glass to scan the object, then the shape of the object is obtained and image data is generated, but the carriage skews during movement causing image distortion and reducing measurement precision
Solution Approach 1:
The patent applies preliminary action by calculating corrective values before actual object measurement. The system first scans a flat gauge to determine the relationship between the carriage movement direction and main scanning direction, pre-calculating correction parameters that are then applied during subsequent measurements to compensate for carriage skewing effects
Solution Approach 2:
The system implements feedback by using the scanned flat gauge image to determine the actual carriage scanning direction, then using this information to calculate corrective values that are applied to subsequent measurement images. This closed-loop approach continuously compensates for carriage skewing based on actual scanning conditions
2Measurement precision
If a reference scale is placed on the reading face to measure object dimensions, then dimension measurement is enabled, but the reference scale occupies space that could be used for image acquisition
Solution Approach 1:
The patent extracts the reference scale from the image acquisition area by placing it on the contact glass outside the range where the optical sensor scans objects. This allows the reference scale to be scanned separately to establish coordinate relationships without occupying space needed for object imaging
Solution Approach 2:
The flat gauge serves as an intermediary element between the reference scale and the object being measured. It provides reference lines that enable the system to calculate corrective values for carriage skewing, facilitating accurate dimension measurement without the reference scale interfering with object image acquisition
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
The solution enhances measurement accuracy by correcting image distortions caused by carriage skewing, ensuring precise computation of object dimensions through effective alignment and correction processes.
Implementation Method 1
reading devices that optically scan, for example, the shape of an object
Data Source
AI summary
A reading device includes a carriage movable in a sub-scanning direction, an optical sensor mounted on the carriage, the optical sensor being configured to scan an object placed on a contact glass, a reference scale used as a reference when a dimension of the object is computed based on an image obtained as the optical sensor scans the object, a flat gauge to be scanned by the optical sensor to calculate a corrective value used to correct the image obtained by the optical sensor, and circuitry to calculate the corrective value based on a scanned image including the reference scale and the flat gauge obtained by the optical sensor, and correct, based on the corrective value, a measurement image including an image of the object and an image of the reference scale obtained by the optical sensor and compute the dimension of the object based on the corrected measurement image.