Scalable Video Coding Content Protection via Base Layer Watermarking
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Solution Overview
Problem
Existing scalable video coding schemes lack effective content protection, as decoding using only the base codec can produce a visually acceptable representation of the original video signal, potentially compromising content security.
Innovation Solution
The introduction of a watermark in the base layer of the video signal, which is fully or substantially removed in the enhancement layer, making it difficult for decoders without the correct enhancement layer data to produce a clear output, thus enhancing content protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single encoded video signal is designed to be decodable by both base codec-only devices and enhancement layer-capable devices, then device compatibility and versatility are improved, but content protection capability deteriorates because base codec decoders can produce visually acceptable output
Solution Approach 1:
The video signal is segmented into base layer and enhancement layer components. The base layer contains modified signal elements that appear as artifacts when decoded alone, while the enhancement layer contains correction data that removes these artifacts. This segmentation allows the same encoded signal to serve both base codec-only devices (which see artifacts) and enhancement-capable devices (which reconstruct clean video), thereby maintaining device compatibility while improving content protection.
2Manufacturing precision
If the base layer is made sufficiently detailed to provide good visual quality when decoded alone, then visual quality is improved, but content protection capability deteriorates
Solution Approach 1:
The base layer intentionally contains modified signal elements with specific local characteristics (artifacts) that degrade visual quality when decoded alone. These modifications are localized to specific signal elements and are designed to be imperceptible or acceptable at base layer resolution, while the enhancement layer provides correction data that restores the original quality when combined. This local quality approach ensures that base layer decoders produce visually acceptable but protected output, while enhancement decoders achieve high visual quality.
3Reliability
If modification signals are applied to the base layer to enhance content protection, then content protection is improved, but decoder complexity increases
Solution Approach 1:
The modification signals act as an intermediary mechanism between the base layer and enhancement layer. When applied to the base layer, these signals create controlled artifacts that serve as content protection. The key insight is that base codec decoders ignore these modifications (treating them as normal encoding variations), while enhancement decoders use the corresponding correction data to remove the artifacts. This intermediary approach provides content protection without requiring base decoders to become more complex.
Data Source
AI summary
A to-be-modified signal, I1, is modified using a modification signal, I2, to produce a modified signal, IM. The modified signal, IM, has an element corresponding to an element of the to-be-modified signal, I1. The element of the modified signal, IM, has a modified value with respect to a value of the corresponding element of the to-be-modified signal, I1. The modified signal, IM, or a down-sampled modified signal derived based on down-sampling the modified signal, IM, is sent to be encoded. A decoded modified signal, BD, is received. The decoded modified signal, BD, is a decoded version of the modified signal, IM, as encoded or of the down-sampled modified signal as encoded. The decoded modified signal, BD, is used to generate a processed signal, U. Residual data, R, is generated based at least on a value of an element of a target signal, I1, and a value of a corresponding element of the processed signal, U.