Scalable Video Coding Layers for HDR Compatibility
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Solution Overview
Problem
Current video coding technologies are inadequate for handling high dynamic range (HDR) and wide color gamut (WCG) content, as they often downsample or downconvert these formats before encoding, leading to a loss of quality and incompatibility with various display technologies, while also being limited by network bandwidth constraints.
Innovation Solution
The proposed solution involves a scalable encoding system that processes high-quality video data into multiple layers, including a base layer and enhancement layers, which can be mapped to the dynamic range or color gamut of the target display, using metadata for adaptive transformation and predictive coding to maintain high quality and compatibility with conventional decoders.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If HDR/WCG content is encoded using conventional video coding technologies, then the content must be downsampled or downconverted to lower bit depth, but this results in loss of quality and incompatibility with diverse display technologies
Solution Approach 1:
The video signal is segmented into multiple layers: a base layer encoded at conventional bit depth (8-10 bits) for compatibility with existing decoders and displays, and enhancement layers encoded at higher bit depth (12-16 bits) for HDR/WCG content. The decoder can selectively process these layers based on display capabilities, ensuring both compatibility and quality.
Solution Approach 2:
The patent introduces a new dimension of scalability by encoding video at multiple bit depths simultaneously. Instead of choosing a single bit depth, the system creates a multi-dimensional representation where the same video content exists at different quality levels, allowing receivers to select the appropriate layer based on their display capabilities.
2Manufacturing precision
If video content is encoded at high bit depth for HDR/WCG, then quality is improved, but network bandwidth requirements increase
Solution Approach 1:
The high-bit-depth video data is segmented into a base layer at conventional bit depth and enhancement layers at higher bit depths. Receivers with limited bandwidth can decode only the base layer, while those with higher bandwidth can utilize the enhancement layers, providing scalable bandwidth efficiency.
Solution Approach 2:
The patent changes the parameter of bit depth across different layers of the same video stream. By varying the bit depth parameter from 8-10 bits in the base layer to 12-16 bits in enhancement layers, the system optimizes the trade-off between quality and data volume based on receiver capabilities.
3Adaptability or versatility
If conventional encoders are used to maintain compatibility with existing decoders, then decoder compatibility is ensured, but the ability to handle HDR/WCG content is lost
Solution Approach 1:
The encoded video stream is segmented into a base layer that conventional decoders can process and enhancement layers that provide HDR/WCG capabilities. This segmentation allows the same bitstream to serve both conventional and advanced displays without requiring different encoding systems.
Solution Approach 2:
The scalable video coding structure creates a universal bitstream that serves multiple functions: it provides baseline compatibility with conventional decoders while simultaneously enabling HDR/WCG content delivery to advanced displays. The single encoding system achieves multi-functionality by incorporating multiple quality layers.
Data Source
AI summary
Systems and methods are provided for processing high quality video data, such as data having a higher than standard bit depth, a high dynamic range, or a wide or custom color gamut, to be compatible with conventional encoders and decoders without significant loss of quality. High quality data is encoded into a plurality of layers with a base layer having the standard quality data and one or more higher quality layers. Decoding systems and methods may map the base layer to the dynamic range or color gamut of the enhancement layer, combine the layers, and map the combined layers to a dynamic range or color gamut appropriate for the target display. Each of the standard quality and the high quality data may be encoded as a plurality of tiers of increasing quality and reference lower level tiers as sources of prediction during predictive coding.