Interchangeable Camera Calibration Data Storage for Document Verification Systems
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional systems for detecting machine-readable security features in documents of value, such as banknotes, require complete system replacement if a sensor fails, due to the dependence of calibration on specific sensor and processing device characteristics, making it impossible to replace individual components without recalibrating the entire system.
Innovation Solution
A system with an interchangeable camera connected to a processing device, where camera calibration data and processing device correction data are stored and used to adjust the camera calibration for different systems, allowing cameras from one system to be calibrated and used in another, enabling the replacement of cameras without recalibrating the entire system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system uses joint calibration of sensors and processing device, then measurement precision is improved, but device complexity increases and repairability deteriorates
Solution Approach 1:
The calibration data is segmented into two independent parts: sensor-specific calibration data and processing device-specific correction data. This segmentation allows the sensor to be replaced without requiring recalibration of the entire system, as only the sensor's calibration data needs to be transferred to the new sensor.
Solution Approach 2:
A calibration data storage medium (such as a memory device or database) acts as an intermediary between the sensor and processing device. This intermediary stores and transfers calibration data, enabling the decoupling of sensor calibration from processing device calibration and facilitating sensor replacement.
2Reliability
If the system performs joint calibration of sensor and processing device, then reliability is improved, but adaptability deteriorates
Solution Approach 1:
The calibration system is segmented into independent sensor calibration and processing device correction components. This allows different sensors to be interchangeably connected to the same processing device, as each sensor carries its own calibration data that compensates for its specific characteristics.
Solution Approach 2:
The calibration approach changes from fixed system-wide parameters to variable sensor-specific parameters. Each sensor has its own calibration data that can be adjusted independently, allowing the system to adapt to different sensor characteristics while maintaining reliable detection.
3Measurement precision
If complete system replacement is required upon sensor failure, then measurement precision is maintained, but loss of time increases
Solution Approach 1:
The calibration data is extracted from the processing device and stored on the sensor itself or on a separate transferable medium. This extraction allows the sensor to be replaced independently without affecting the processing device, significantly reducing replacement time while maintaining detection precision through data transfer.
Solution Approach 2:
Calibration data is prepared and stored in advance on the sensor or calibration medium before replacement is needed. When a sensor fails, the pre-prepared calibration data can be quickly transferred to the replacement sensor, eliminating the need for time-consuming recalibration procedures.
Data Source
Figure 1
Figure 2~2B
Figure 3
AI summary
System (1) comprising a processing unit (3) and a camera (5-1, 5-2) connected thereto for detecting a machine-readable security feature of a valuable document, wherein the system (1) comprises: a processing unit (3) and a connected and interchangeable camera (5-1, 5-2) for detecting a machine-readable security feature of a valuable document, wherein the system (1) is calibrated using processing unit correction data relating to characteristics of the processing unit (3) and camera calibration data relating to the characteristics of the processing unit (3) and the camera (5-1, 5-2) connected thereto, wherein the camera (5-1, 5-2) has a memory (7-1, 7-2) configured to store the processing unit correction data and the camera calibration data relating to the system (1) in which the calibration takes place, and wherein the processing unit (3) has a memory (23, 25) shows,which is set up to store the processing equipment correction data and the camera calibration data relating to the system (1) in which the operation to verify a machine-readable security feature of the valuable document takes place.