Halftone Screen Signatures for Print Authentication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In high-end fine art printing, maintaining image quality while distinguishing limited edition prints from regular prints is challenging, as existing solutions often compromise image quality or color consistency to introduce detectable differences.
Innovation Solution
The use of controlled halftoning screen signatures with spatial frequencies and spectral properties that are substantially the same but with distinct spatial signatures, allowing for the creation of high-quality, visually identical prints that can be differentiated through imaging systems, such as PARAWACS and HANS halftoning methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If detectable differences are introduced between prints to distinguish limited edition prints, then authentication capability is improved, but image quality and color consistency deteriorate
Solution Approach 1:
The patent applies local quality by introducing detectable differences only in specific local regions of the print (such as halftone screen signatures in particular areas) rather than throughout the entire image. This allows authentication to be performed on localized portions without compromising the overall image quality and color consistency of the main artwork.
Solution Approach 2:
The patent utilizes parameter changes by modifying physical or chemical parameters of the printing process (such as halftone screen frequency, dot pattern characteristics, or ink deposition parameters) to create detectable differences between limited edition and regular prints. These parameter variations are subtle enough to maintain visual quality while being sufficient for authentication purposes.
2Reliability
If halftone screen signatures with distinct spatial signatures are used, then print differentiation capability is improved, but detectability without imaging systems deteriorates
Solution Approach 1:
The patent applies segmentation by separating the print into different functional components: the main image area that maintains visual quality and the halftone screen signature areas that contain authentication information. This segmentation allows the detectable differences to be confined to specific regions that do not interfere with the overall visual appearance when viewed without specialized imaging systems.
Solution Approach 2:
The patent introduces an intermediary detection system (imaging system with specific analysis capabilities) that acts as a mediator between the printed output and the authentication process. The halftone screen signatures are designed to be detectable by this intermediary system, which translates the subtle physical differences into authenticated information without requiring the naked eye to detect them.
Data Source
AI summary
Systems, apparatuses, and methods may provide for technology to control the printing of halftoning screen signatures for various levels of prints. For example, such prints may include regular edition prints or limited edition prints. During printing, a first halftoning screen is associated with one or more of the regular edition prints and a second halftoning screen is associated with the limited edition print, in some implementations. The second halftoning screen has a spatial frequency that is substantially the same as the first halftoning screen while having a spatial signature different from the first halftoning screen. Additionally, the second halftoning screen further may have spectral properties that are substantially the same as the first halftoning screen. During printing, two different printed copies of an image are formed using the first halftoning screen and the second halftoning screen.