HDR Layered Encoding for Flexible Transcoding and Image Synthesis
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Solution Overview
Problem
Current HDR transcoding schemes result in exceptions and affect user experience due to direct transcoding of HDR images or videos, leading to incorrect bitstream generation and abnormal visual effects.
Innovation Solution
An encoding method that divides HDR data into base-layer and enhancement-layer data, with metadata containing indication information for decoding schemes, allowing flexible selection of encoding schemes based on region characteristics, improving encoding efficiency and synthesis effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If HDR image or video is directly transcoded, then transcoding process is simple, but exceptions occur and user experience is affected
Solution Approach 1:
The patent segments the HDR transcoding process into multiple layers: a base layer containing essential HDR information and an enhancement layer containing additional detail information. This segmentation allows the decoder to process and reconstruct the HDR image step by step, avoiding direct transcoding exceptions while maintaining output quality.
Solution Approach 2:
The encoder performs preliminary processing by separating the HDR image data into base layer and enhancement layer components before transmission. This preliminary segmentation enables the decoder to reconstruct the image correctly without encountering exceptions during the transcoding process.
2Device complexity
If single-layer transcoding scheme is used, then encoding process is simple, but synthesis effect is abnormal
Solution Approach 1:
The patent divides the enhancement layer into multiple sub-layers (first enhancement layer and second enhancement layer) with different resolution levels. This segmentation allows precise control over the synthesis process, enabling high-quality reconstruction of the HDR image while maintaining manageable encoding complexity.
Solution Approach 2:
The patent introduces an additional dimension to the encoding structure by adding resolution information as a separate parameter. The enhancement layer contains not only color detail information but also resolution indicators, enabling the decoder to synthesize the image at the correct resolution level and avoid abnormal synthesis effects.
3Device complexity
If HDR data is encoded without region-based encoding schemes, then encoding process is simple, but encoding efficiency is reduced
Solution Approach 1:
The patent applies different encoding schemes to different regions of the HDR image based on their characteristics. High-frequency detail regions are encoded with higher precision than low-frequency regions, optimizing the balance between encoding efficiency and output quality while maintaining manageable process complexity.
Data Source
AI summary
This disclosure provides an encoding method, a decoding method, and a related device. The method includes: obtaining a first HDR image and N pieces of first base-layer data corresponding to the first HDR image; determining N pieces of first enhancement-layer data based on the first HDR image, the N pieces of first base-layer data, and at least one encoding scheme, where N is a positive integer greater than or equal to 1; and encoding the N pieces of first enhancement-layer data, the N pieces of first base-layer data, and first metadata to obtain a bitstream, where the first metadata includes first indication information, and the first indication information indicates the at least one encoding scheme or a decoding scheme corresponding to the at least one encoding scheme. The foregoing technical solution can implement flexible format conversion, improving encoding efficiency and final synthesis effect.