Digital TV Receiver ACR Watermark Extraction
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Solution Overview
Problem
Conventional automatic content recognition (ACR) systems for digital data broadcasting face limitations, including the inability to receive enhancement data without a separate ACR server, deterioration of content quality due to large watermarks, and reliance on external servers for content recognition, which restricts the efficient provision of interactive services.
Innovation Solution
A method and apparatus that enable a digital TV receiver to independently perform ACR functions by embedding and extracting watermarks within broadcast content, allowing it to identify and provide additional information about broadcast programs in real-time without relying on external servers, using techniques such as digital watermarking and fingerprinting to enhance the ACR service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If watermarking technology is used to provide ETV service with large amount of information, then content recognition capability is improved, but quality of content is deteriorated
Solution Approach 1:
The patent segments the ACR functionality into two parts: watermark extraction for basic content identification and fingerprinting for enhanced recognition. This segmentation allows the system to use minimal watermark data embedded in content while obtaining additional recognition information from a separate fingerprint database, thereby maintaining content quality while improving recognition capability.
Solution Approach 2:
The patent introduces a fingerprint database as an intermediary component that stores pre-extracted content features. Instead of embedding large amounts of information directly in watermarks, the system uses the fingerprint database as a mediator to provide additional recognition data, reducing the information burden on watermarks and preserving content quality.
2Measurement precision
If separate ACR server is used for content recognition, then recognition accuracy is improved, but device complexity and service dependency are increased
Solution Approach 1:
The patent merges the ACR server functionality into the receiver itself by equipping the receiver with both watermark extraction capability and fingerprint database. This integration eliminates the need for external ACR servers, reducing system complexity and service dependency while maintaining recognition accuracy through the combined local processing capabilities.
Solution Approach 2:
The patent enables the receiver to perform self-service content recognition by providing it with all necessary components: watermark extraction unit, fingerprint database, and matching logic. The receiver can independently identify content without external server assistance, achieving self-sufficiency in ACR functionality.
3Speed
If external input is used to receive broadcast content, then real-time service is improved, but enhancement data reception is lost
Solution Approach 1:
The patent applies preliminary action by embedding watermarks and fingerprints into broadcast content during the encoding stage. This allows the content to carry embedded identification information that enables real-time ACR processing at the receiver without requiring separate enhancement data transmission, thus maintaining real-time service capability while preserving content identification information.
Data Source
AI summary
An apparatus for processing digital service signals includes a receiving module configured to receive contents having watermarks, where the watermarks are inserted in audio or video frames of the contents, the watermarks carry channel information related to the contents, and content information having URL information for additional data of the contents. An extracting module is configured to extract the watermarks from the audio or video frames, and an obtaining module is configured to obtain the additional data over an IP(Internet Protocol) network using the extracted watermarks.