Invisible Ink Metadata Tags for Document Integrity

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Solution Overview

Problem

Conventional document processing systems face challenges in printing metadata on physical documents without altering the content, especially when clear areas are lacking or when documents contain inks that absorb or fluoresce in the near-IR spectrum, leading to interference and poor read rates of tags.

Innovation Solution

The use of invisible inks that do not substantially fluoresce in the human visible spectrum but are readable outside this spectrum, allowing tags to be printed anywhere on documents without interfering with content, and a system that includes a processor to generate metadata, a printer to print these tags, and a reader to verify them using light outside the visible spectrum.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of information

If conventional visible inks are used to print metadata, then the metadata is readable by human eyes and conventional cameras, but the metadata interferes with document content and requires clear areas for printing

Engineering Contradiction:

Improvemetadata readabilityVSAvoidinterference with document content

Core Design Contradiction:

Loss of informationVSObject-affected harmful factors

Solution Approach 1:

The patent applies color changes by transitioning from visible spectrum inks to invisible spectrum inks (ultraviolet or infrared). The metadata tags are printed using inks that are invisible to the human eye and conventional cameras but detectable by specialized readers, thereby eliminating visual interference with document content while maintaining metadata readability through spectral transformation

Inventive Principle:

Principle #32Color changes

Solution Approach 2:

The patent moves the metadata from the visible dimension to the invisible spectral dimension. By using inks that emit or absorb light at wavelengths outside the visible spectrum, the system adds a new detection dimension that allows metadata to be read without occupying visual space on the document

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Ease of manufacture

If conventional visible inks are used for metadata printing, then the printing process is simple, but the metadata cannot be read when documents contain IR-absorbing or fluorescent inks

Engineering Contradiction:

Improveprinting simplicityVSAvoidmetadata read rate

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent changes the physical parameter of the ink's spectral properties. Instead of using visible light-absorbing inks, the system uses inks that are invisible in the visible spectrum but have distinct absorption or emission characteristics in the ultraviolet or infrared spectrum, enabling reliable reading despite the presence of other inks on the document

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a specialized reader as an intermediary device that detects metadata through spectral means (ultraviolet or infrared light interaction) rather than visible light. This intermediary detection mechanism penetrates the interference caused by IR-absorbing or fluorescent inks to reliably read the invisible metadata tags

Inventive Principle:

Principle #24Intermediary (Mediator)

3Object-affected harmful factors

If invisible inks are used to print metadata, then the metadata does not interfere with document content, but the metadata must be read using specialized equipment outside the visible spectrum

Engineering Contradiction:

Improveinterference with document contentVSAvoidreading equipment complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent creates an invisible copy of the metadata that exists in a different spectral domain. The metadata is encoded in the invisible ink pattern, and specialized readers capture this invisible information through spectral detection, effectively copying the metadata into a detectable signal without requiring complex processing or additional visible markers

Inventive Principle:

Principle #26Copying

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 solution enables reliable reading of metadata without altering the document content, even when printed over existing text, and improves the accuracy and integrity of document processing by eliminating the need for clear areas and reducing interference from IR-absorbing or fluorescent inks.

Implementation Method 1

a reader operable to read the metadata using light outside of the spectrum emitted from the ink

Methodology Applied

Scientific EffectLight absorption and detection: Absorption (EM radiation)

Implementation Method 2

a printer associated with the processor and operable to print a tag containing the metadata on a location of the physical document using an ink substantially invisible in the spectrum

Methodology Applied

Scientific EffectInvisible ink deposition: Deposition (physical)

Data Source

PatentUS11341384B2Document processing system and method for associating metadata with a physical document while maintaining the integrity of its content

Publication Date: 2022.05.24 BANCTEC

AI summary

For use with a physical document bearing content visible when illuminated by light in the human visible spectrum, a tag printer, a verifier and a document processing system employing one or both of the printer and the verifier. In one embodiment, the tag printer includes: (1) a processor operable to generate metadata regarding the physical document and (2) a printer associated with the processor and operable to print a tag containing the metadata on a location of the physical document irrespective of locations of the content using an ink substantially invisible in the spectrum.