Selective Image Encryption for Surveillance Camera Systems
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Solution Overview
Problem
Existing image encryption methods for surveillance cameras are not universally compatible across different manufacturers, leading to interworking issues and inefficient resource usage, as they encrypt entire images regardless of the need for personal information protection.
Innovation Solution
An image encryption method that selectively encrypts specific units of an image based on analysis of events or random selection, using a processor to generate encryption units and a bitstream that includes identification information, allowing for efficient resource use and compatibility across various devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire image is encrypted, then security is improved, but resource consumption increases and interworking compatibility deteriorates
Solution Approach 1:
The image is divided into multiple units (e.g., frames, blocks, or regions), and only specific target units are selected for encryption rather than encrypting the entire image. This segmentation approach reduces the amount of data requiring encryption operations, thereby lowering computational resource consumption while maintaining security for critical portions of the image
Solution Approach 2:
Different encryption strategies are applied to different regions of the image based on their importance. High-security regions (containing personal information or critical data) are encrypted, while low-security regions are left unencrypted or use lighter encryption, creating local quality variations in encryption intensity that optimize resource usage
2Reliability
If the entire image is encrypted, then security is improved, but device complexity increases due to manufacturer-specific implementations
Solution Approach 1:
The patent establishes a universal encryption framework with standardized protocols that can be implemented across devices from different manufacturers. By defining common interfaces, data structures, and encryption workflows, the system achieves multi-functionality where the same encryption approach works universally across diverse hardware platforms, eliminating manufacturer-specific compatibility issues
3Reliability
If encryption is applied to all image units, then security coverage is improved, but efficiency deteriorates due to unnecessary encryption of non-sensitive data
Solution Approach 1:
Instead of applying encryption uniformly to all image units, the system selectively applies encryption only to partial portions of the image that contain sensitive information. This partial action principle allows the system to achieve adequate security coverage for critical data while avoiding the inefficiency of encrypting entire images when only specific regions require protection
4Productivity
If event-based encryption selection is used, then encryption efficiency is improved, but device complexity increases due to event analysis requirements
Solution Approach 1:
The system performs preliminary analysis during image processing to identify units containing events or sensitive information before the encryption stage. By pre-marking or pre-identifying target units that require encryption based on event detection, the actual encryption process can proceed efficiently without requiring complex real-time analysis during encryption, thus balancing efficiency gains with acceptable device complexity
Data Source
AI summary
A method, performed by an image processing device, of encrypting image data includes: selecting an encryption target unit from among a plurality units constituting an image; generating a table including identification information about the encryption target unit; generating a first encryption unit including data obtained by encrypting the encryption target unit; generating a second encryption unit including data obtained by encrypting the table; and generating a bitstream including the first encryption unit, the second encryption unit, and units other than the encryption target unit among the plurality of units constituting the image.