Frequency Domain Image Watermarking for Robust Copyright Protection
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Solution Overview
Problem
Existing digital watermark methods in the spatial domain are easily perceivable and susceptible to interference, making them ineffective for protecting data from unauthorized access and infringement.
Innovation Solution
The method involves obtaining a frequency domain mark image through frequency domain transformation of a spatial domain mark image and performing layer superimposition rendering with target page data using a transparency parameter, effectively hiding the watermark and enhancing compression resistance and smearing resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If spatial domain watermarking is used to make watermark invisible, then watermark perceptibility is improved, but watermark robustness deteriorates
Solution Approach 1:
The patent transforms the watermark from spatial domain to frequency domain, changing the domain parameter. This allows the watermark to be embedded in frequency coefficients rather than pixel values, making it invisible to human perception while being robust against spatial transformations like compression and smearing.
Solution Approach 2:
The patent introduces frequency domain transformation as an intermediary process between the original image and the watermarked image. By operating in the frequency domain and then transforming back, the system achieves both invisibility and robustness that cannot be obtained by direct spatial domain operations.
2Measurement precision
If watermark strength is increased to improve protection, then watermark detectability is improved, but watermark perceptibility worsens
Solution Approach 1:
By changing from spatial domain to frequency domain, the patent enables independent control of watermark strength in frequency coefficients without directly affecting pixel intensity perception. This allows strong watermarks to be embedded while remaining imperceptible in the spatial domain.
Solution Approach 2:
The patent moves the watermark operation from the spatial dimension to the frequency dimension. This dimensional transformation allows the watermark to be optimized for detectability in frequency space while maintaining imperceptibility in spatial space, resolving the contradiction between these two requirements.
3Difficulty of detecting and measuring
If frequency domain transformation is applied to hide watermark, then watermark perceptibility is improved, but processing complexity increases
Solution Approach 1:
The patent replaces direct spatial domain manipulation with frequency domain transformation operations. While this adds transformation steps, it eliminates the need for complex adaptive algorithms to achieve robustness, as the frequency domain operations naturally provide protection against spatial transformations through their mathematical properties.
Data Source
AI summary
This application relates to an image processing method and apparatus, a storage medium, and a computer device. The method includes: obtaining a frequency domain mark image, the frequency domain mark image being obtained by performing frequency domain transformation on a spatial domain mark image; obtaining a transparency parameter configured corresponding to the frequency domain mark image; obtaining target page data; and performing layer superimposition rendering of the frequency domain mark image and the target page data according to the transparency parameter. The solution provided in this application can effectively protect target page data.