Digital Watermark Embedding in Moving Images
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Solution Overview
Problem
When embedding digital watermarks into moving image data, the embedded information often becomes noise, interfering with correct detection and causing deterioration of the content, especially due to variations in pixel values over time.
Innovation Solution
A digital watermark embedding apparatus that generates a watermark signal based on input information, determines the optimal frame for embedding by analyzing pixel value variations and feature correlations, and adjusts the moving image data in the time axis direction to minimize noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If watermark information is embedded into moving image data, then copyright information and purchase information can be added to the content, but the embedded information becomes noise that interferes with correct detection and deteriorates the content quality
Solution Approach 1:
The patent applies preliminary action by determining the optimal frame for watermark embedding before actually embedding the watermark signal. The system analyzes pixel value variations in advance to identify frames with minimal variation, ensuring the watermark will be embedded in a stable temporal region. This preliminary analysis prevents noise interference by selecting frames where the watermark signal will not be confused with temporal variations in the video content.
Solution Approach 2:
The patent applies local quality by selectively embedding the watermark signal only in specific frames that have been identified as having minimal pixel value variation. Instead of embedding the watermark uniformly across all frames, the system concentrates the watermark embedding in locally optimal temporal regions. This ensures that the watermark information is embedded where it will have the highest detectability and lowest interference with the video content.
2Reliability
If the watermark signal is embedded into all frames, then the watermark information is more robust, but the noise interference and content deterioration increase
Solution Approach 1:
The patent applies partial action by embedding the watermark signal in only a subset of frames rather than all frames. The system identifies specific frames with minimal pixel value variation and embeds the watermark only in those frames. This partial embedding approach maintains sufficient detection reliability while reducing the overall noise interference and content deterioration that would result from embedding in every frame.
Solution Approach 2:
The patent applies parameter changes by dynamically selecting frames based on their temporal stability characteristics. The system changes the embedding parameter (frame selection) based on the measured pixel value variation of each frame. Frames with lower variation parameters are selected for watermark embedding, while frames with higher variation are excluded. This adaptive parameter adjustment optimizes the balance between detection reliability and noise reduction.
3Manufacturing precision
If phase adjustment is used to suppress content deterioration, then the original signal can be used as embedding object, but the process complexity increases
Solution Approach 1:
The patent applies the extraction principle by removing the need for complex phase adjustment processes. Instead of modifying the original signal through phase adjustment, the system extracts and utilizes the temporal stability characteristics of different frames. By identifying and selecting frames with minimal pixel value variation, the patent extracts the essential property needed for robust watermark embedding without requiring complex signal processing operations like phase adjustment.
Data Source
AI summary
An apparatus for embedding a digital watermark includes a memory, and a processor coupled to the memory and configured to generate a watermark signal to be embedded into moving image data based on information to be added to the moving image data, determine a frame of the moving image data at which overlapping of the watermark signal is to be started based on a variation in value in a time direction of a pixel in a region, in each of a plurality of frames of the moving image data, into which the watermark signal is to be embedded and also on a feature of the watermark signal, and embed the watermark signal beginning with the determined frame.