Image Correction Device for Double-Sided Reading Misalignment
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Solution Overview
Problem
Existing image reading devices for double-sided objects face misalignment issues due to variations in sensor mounting positions, leading to reduced identification accuracy and increased costs for measurement and correction, especially when both sides are read in a single pass.
Innovation Solution
An image correction device that connects two sensors to read the front and back of an object, using a correction chart to calculate and correct misalignment by generating correction information based on the positions of straight and oblique line segments, allowing for accurate alignment and synthesis of images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two image sensors are used for front and back reading, then double-sided reading capability is achieved, but misalignment occurs due to variations in mounting positions
Solution Approach 1:
A correction chart is introduced as an intermediary element to measure and correct the misalignment between front and back image sensors. The correction chart includes specific patterns (straight line segments, oblique line segments, and their intersections) that serve as reference markers to detect and quantify the relative position deviations of the two sensors, enabling subsequent alignment correction of the captured images.
2Measurement precision
If expensive measurement devices or individual sensor measurements are used, then accurate recognition of mounting position variations is achieved, but system cost and complexity increase
Solution Approach 1:
The system performs self-measurement and self-correction by using the correction chart to automatically detect mounting position variations of the image sensors. The correction information is generated internally by comparing the detected positions of known patterns on the correction chart with their expected positions, eliminating the need for external expensive measurement devices or manual calibration procedures.
3Measurement precision
If correction information is generated based on pattern positions, then alignment accuracy is improved, but additional processing steps are required
Solution Approach 1:
The correction chart is prepared in advance with known geometric patterns (straight line segments, oblique line segments at determined angles, and their intersections) at predetermined positions. This preliminary setup allows the system to pre-calculate expected positions and use them as reference for detecting actual sensor misalignment, streamlining the correction process by having all reference data ready before measurement begins.
Data Source
AI summary
A read sensor generates front side image information indicating an image on a front side of an object to be read, and front side measurement information indicating a line of an image in a main scanning direction on the front side of a correction chart. A read sensor generates back side image information indicating an image on a back side of the object to be read, and back side measurement information indicating a line of an image in the main scanning direction on the back side of the correction chart. The image correction device calculates an amount of misalignment of read positions based on the front side measurement information and the back side measurement information, and corrects misalignment of images on the front side and the back side of the object to be read, indicated by the front side image information and the back side image information.