Identity Document Image Watermarking via Pre-Processed Blocks
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Solution Overview
Problem
Electronic identity documents, such as passports, lack control over the dissemination of digital images once transmitted, posing a security risk as the owner cannot prevent unauthorized use or distribution.
Innovation Solution
A method is introduced where modified data blocks are created and stored during the personalization phase of the identity document, allowing for quick marking and tracking of digital images, enabling the identity document to mark and tag images before transmission, thereby controlling and tracing their use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If digital images are transmitted from electronic identity documents to terminals for processing and verification, then the utility and accessibility of the document is improved, but the owner loses control over subsequent dissemination and unauthorized use of the images
Solution Approach 1:
The patent applies preliminary action by embedding watermarks and tracking data into digital images before they are transmitted from the electronic identity document to external terminals. This pre-marking process ensures that the image carries identification information from the moment of transmission, enabling subsequent tracking and control of its dissemination without interfering with the normal verification workflow.
2Reliability
If watermarking and tracking data are calculated and processed during the marking phase within the identity document, then the security control over image distribution is improved, but the processing time and computational load increase significantly
Solution Approach 1:
The system performs preliminary action by pre-calculating and storing multiple modified blocks of image data during the personalization phase of the identity document. These pre-processed blocks are ready for rapid insertion during the marking phase, eliminating the need for time-consuming real-time image processing when watermarks need to be applied, thus resolving the contradiction between security control and processing time.
Solution Approach 2:
The patent applies segmentation by dividing the image into multiple blocks and pre-processing these blocks separately during personalization. The identity document stores multiple modified versions of these blocks, allowing the system to quickly assemble watermarked images by selecting and combining pre-processed blocks rather than processing the entire image in real-time, thereby reducing marking duration while maintaining security.
3Adaptability or versatility
If multiple modified blocks are stored in the identity document data structure for each original block, then the flexibility and quality of watermarking options are improved, but the memory requirements and data structure complexity increase
Solution Approach 1:
The patent applies universality by designing a data structure that stores multiple modified blocks for each original image block, where these blocks serve multiple functions: they can be used for different watermarking scenarios, accommodate various terminal requirements, and provide fallback options if certain watermarks fail. This multi-functional approach increases versatility while the structured organization keeps complexity manageable.
Data Source
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AI summary
The invention relates essentially to a method of creating an electronic identity document, said method comprising the following steps: - obtaining (S30) of the file of an original digital image, - obtaining (S32) of at least one block of data of said file, termed the original block, - for each original block: - creating (S34) of at least two modified blocks, - recording (S36) of each modified block in a data structure of said document, each modified block being indexed in said data structure by the location of said original block in the file of a digital image intended to be marked, and by a different input.