Optical Verification of Book-Shaped Security Documents
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Solution Overview
Problem
The manufacturing process of book-shaped ID, value, or security documents, such as passports, often experiences malfunctions resulting in incorrect page inclusion, variation in number, order, or orientation, which are not detected until late in the production process, leading to inefficiencies in quality control and resource waste.
Innovation Solution
A method that involves printing person- and/or document-specific test features on unbound pages, which are then visually detected by a camera and evaluated against a reference stored in a database to ensure accuracy in page number, order, and orientation, allowing for immediate stopping of the production process if errors are detected, thus preventing faulty documents from progressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pages are collated and bound in the production process, then the document is manufactured, but errors in page number, sequence, or orientation are not detected until late in the process
Solution Approach 1:
The verification feature is printed on the pages before collation and binding, and the optical detection is performed at an early stage in the production process, before the pages are fully assembled. This preliminary detection allows errors to be identified early without delaying the overall production timeline.
Solution Approach 2:
A verification feature (test feature) is introduced as an intermediary element that can be optically detected to indicate whether pages are correctly collated. This intermediary feature enables non-contact verification of page sequence and orientation without requiring manual inspection or stopping the production line.
2Reliability
If manual inspection is performed to detect page errors, then quality control is improved, but production time and resources are wasted
Solution Approach 1:
Manual mechanical inspection is replaced with an optical detection system using a camera and evaluation computer. The system optically captures images of the verification feature and automatically evaluates whether pages are correctly collated, eliminating the need for manual inspection while maintaining high detection accuracy.
Solution Approach 2:
The production process performs self-verification through the optical detection system that automatically identifies errors in page collation. The system evaluates the verification feature and can trigger automatic rejection of defective documents, enabling the process to monitor and correct itself without external intervention.
3Productivity
If defective documents are produced and then inspected, then all documents are manufactured, but resources are wasted on faulty documents
Solution Approach 1:
The verification feature, which could be seen as an additional printing step, actually serves a dual purpose: it enables automatic optical detection of collation errors and provides a means to identify and reject defective documents early. This converts what might be considered an extra step into a beneficial quality control mechanism that prevents waste.
Solution Approach 2:
The verification feature is extracted as a separate detectable element that can be used to identify defective documents. By having this distinct feature, the system can selectively remove only the defective documents from the production stream without affecting the quality or production of good documents.
4Measurement precision
If verification features are printed on each page separately, then page-specific verification is achieved, but printing complexity increases
Solution Approach 1:
The verification feature printing process is designed to be universal, printing the same type of verification feature on all pages in the same location. This multi-functional approach allows a single printing setup to handle all pages consistently, eliminating the need for different printing processes for different pages while maintaining the ability to detect collation errors.
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
This method significantly reduces quality control efforts by stopping errors before completion, ensuring only error-free documents are produced and conserving resources by identifying and removing faulty documents early in the process without affecting cycle time.
Implementation Method 1
optically capturing the person- and/or document-specific verification feature laterally with respect to the stacking direction of the pages by means of a camera
Data Source
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AI summary
The invention relates to a method for monitoring the manufacturing process of a book-shaped identification, value, or security document (100) comprising the steps of: - providing a plurality of unbound pages (108) printed with person- and/or document-specific verification features or with a part of a single person- and/or document-specific verification feature, wherein the verification feature or part thereof extends to the edge of the respective page (108); - collating the pages (108) along a stacking direction; - binding the collated pages (108); - optically detecting the person- and/or document-specific verification feature laterally with respect to the stacking direction of the pages (108) by means of a camera (128);and - Checking, using an evaluation computer, whether the person- and/or document-specific verification characteristic matches a reference stored in a database, whereby, in the case of a match with the reference, the production process of the identification, value or security document (100) is continued, and, in the case of a lack of match with the reference, the production process of the identification, value or security document (100) is stopped.;