Video Quality Signalling for Bitrate-Constrained Encoding
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Solution Overview
Problem
Existing video encoding methods fail to provide accurate information about the visual quality of the encoded video content to end users, particularly in scenarios where different sources with varying quality are provided, and existing quality metrics are not applicable due to lack of source material availability.
Innovation Solution
A mechanism is developed to measure the visual quality of encoded video streams by averaging quantization parameters and residuals across frames, normalizing these values, and identifying frames or time periods with potential degraded quality, allowing providers to select alternative content based on these metrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the quantization parameter is increased to reduce bitrate, then the transmission bit rate decreases, but the visual quality of decoded frames deteriorates
Solution Approach 1:
The patent applies preliminary action by detecting unfavorable situations (such as damage on input stream or lack of available bitrate) before encoding occurs. The system pre-calculates and signals quality parameters that indicate potential visual quality issues, allowing receivers to prepare appropriate actions (like switching to alternative content or alerting users) before the degraded quality is experienced.
Solution Approach 2:
The patent implements feedback by embedding quality indicator signals in the encoded bitstream that provide information about visual quality to the receiver. This feedback mechanism allows the receiver to understand the quality level of incoming content and make informed decisions about content selection or modification, creating a closed-loop system that addresses the bitrate-quality tradeoff.
2Manufacturing precision
If the quantization parameter is decreased to maintain visual quality, then the transmission bit rate increases, but the bitrate efficiency deteriorates
Solution Approach 1:
The patent introduces an intermediary quality signal that mediates between the encoder and receiver. This quality indicator acts as a messenger that conveys information about visual quality without requiring the receiver to actually receive and analyze the full video content, thus reducing the need for high bitrate while maintaining quality awareness.
Solution Approach 2:
The patent replaces the mechanical approach of transmitting more data (higher bitrate) to ensure quality with an information-based approach. Instead of relying on the receiver to analyze video quality through actual content transmission, the system substitutes this with pre-computed quality indicators that provide the same information more efficiently.
3Quantity of substance
If motion compensation is used to compress video, then the bitrate efficiency improves, but the complexity of motion estimation increases
Solution Approach 1:
The patent extracts quality assessment functionality from the main video encoding/decoding process. Instead of requiring complex motion estimation and full video analysis at the receiver to determine quality, the system separates quality evaluation into a preliminary step performed by the encoder, extracting only the essential quality information that needs to be transmitted.
Solution Approach 2:
The patent applies self-service by having the encoder automatically perform quality assessment and signal quality parameters without requiring complex external analysis. The encoding system serves its own quality evaluation needs by integrating quality measurement into the encoding process itself, eliminating the need for separate complex quality analysis systems.
Data Source
AI summary
A system for software download compatibility.