Selective Image Encryption with Positioning Markers
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Solution Overview
Problem
Existing image encryption techniques for printed matter are inefficient for small encrypted regions, result in information loss, and struggle with distortion, and are not suitable for color images or data-rich information like images or audio, with issues in decryption accuracy and applicability to character hiding applications.
Innovation Solution
An image encryption apparatus that specifies a partial region for encryption, converts pixel values to create a specifiable pattern, adds positioning markers, and includes a checkmark for decryption validity, allowing efficient encryption and decryption of digital images, even in small regions, while minimizing information loss and handling color images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire image is encrypted using conventional techniques, then information security is improved, but encryption efficiency deteriorates when only a small region needs to be encrypted
Solution Approach 1:
The patent divides the image into multiple blocks and applies encryption only to specific blocks that contain important information, rather than encrypting the entire image. This segmentation allows selective encryption of small regions while maintaining security, directly resolving the contradiction between information security and encryption efficiency.
2Measurement precision
If a frame for positioning is added outside the encryption image, then decryption accuracy is improved, but information loss occurs as original image information is overwritten
Solution Approach 1:
The patent embeds positioning markers inside the encrypted image blocks rather than adding frames outside. The positioning markers are nested within the encryption blocks themselves, allowing accurate position detection during decryption without overwriting or losing any original image information.
3Area of stationary object
If conventional encryption techniques are applied to small regions, then encryption coverage is improved, but distortion detection capability deteriorates
Solution Approach 1:
The patent creates composite encryption blocks that combine multiple functions: encryption of image data, embedded positioning markers, and distortion detection capabilities all within the same block structure. This composite approach allows small encrypted regions to maintain accurate block detection and positioning.
4Adaptability or versatility
If binary data is embedded in printed matter using conventional techniques, then data embedding capability is improved for text information, but applicability deteriorates for color images and data-rich information
Solution Approach 1:
The patent changes the parameter representation from binary data only to support multiple data types including color images, audio information, and text. The encryption blocks can accommodate various data formats and information densities, greatly expanding adaptability while increasing information capacity through efficient encoding.
Data Source
AI summary
An image encryption apparatus encrypts a digital image by specifying a partial region from the digital image, converting the selected partial region into a processing image based on an encryption key, and specifying a position of the partial region by regularly converting a pixel value of the processing image.