Image Encryption via Line Interlacing and Pixel Modulation
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Solution Overview
Problem
Existing methods for protecting digital content from unauthorized recapture using imaging devices are incomplete, as they either fail to prevent recapture or limit the operating conditions, making it difficult to control illegal leakage of high-quality digital content.
Innovation Solution
An image encryption method based on line interlacing characteristics, which adjusts the intensity range of RGB channels, performs pixel modulation in block units, and interlaces odd- and even-numbered lines to generate an interlaced image, allowing only authorized users with polarized glasses or masking to view the secret image, while maintaining high image quality and authenticity verification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If digital watermarking or image recapture detection is used, then copyright verification is improved, but the ability to prevent recapture itself is worsened
Solution Approach 1:
The patent applies preliminary action by encrypting the image content before display using line interlacing and pixel modulation techniques. The secret image is concealed within the public image through pre-processing encryption operations, so that when recapture occurs, the encrypted content cannot be extracted or decoded without the decryption key, thus preventing copyright infringement before it can happen
2Reliability
If security films or infrared devices are used for recapture prevention, then image encryption is improved, but device complexity and operating condition limitations are worsened
Solution Approach 1:
The patent replaces mechanical/optical security measures (security films, infrared devices, polarized glasses) with a software-based image processing system. The encryption is achieved through line interlacing and pixel modulation algorithms that operate on standard display screens without requiring any special hardware modifications, thus reducing device complexity while maintaining encryption effectiveness
Solution Approach 2:
The patent creates a universal image encryption system that can be applied to any digital image for display on standard screens. The line interlacing and pixel modulation techniques are general-purpose methods that work with any image content and require no specific operating conditions, making the system broadly applicable across different devices and scenarios
3Reliability
If line interlacing encryption is applied, then recapture prevention is improved, but image quality and processing complexity are worsened
Solution Approach 1:
The patent applies segmentation by dividing the image processing into distinct stages: line interlacing separates odd and even lines to create the encrypted structure, while pixel modulation operates on individual pixel values within defined ranges. This segmented approach allows each processing step to be optimized independently, maintaining image quality while achieving encryption
Data Source
AI summary
An image encryption method. The method includes generating an adjusted secret image by adjusting an intensity range to be the same for each RGB channel of a secret image; generating a modulated image by repeating pixel modulation in block units on the adjusted secret image; and generating an interlaced image by interlacing odd-numbered lines of the adjusted secret image with even-numbered lines of the modulated image or interlacing even-numbered lines of the adjusted secret image with odd-numbered lines with the modulated image.