Chroma Quantization Offset Signaling for Video Coding Efficiency
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images and videos, such as UHD images and videos of 4K or 8K, poses challenges in efficiently compressing and transmitting or storing these data, leading to higher transmission and storage costs. Additionally, there is a need for effective signaling of image/video information, particularly for chroma quantization parameter offsets, to improve coding efficiency.
Innovation Solution
The proposed method involves improving video/image coding efficiency by efficiently parsing and signaling palette coding and transform unit-related information. This includes defining conditions for effective signaling of chroma quantization parameter offset information within palette coding and transform units, and using index information for the chroma quantization parameter offset list based on the number of entries in the list.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution and high-quality image and video data are transmitted or stored, then image and video quality is improved, but transmission cost and storage cost are increased
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the chroma quantization parameter (QP) based on the chroma_qp_offset_list and picture characteristics. The encoder modifies QP values for different chroma components (Cb, Cr) and regions within the image to optimize the balance between compression efficiency and quality preservation, thereby reducing the total data size while maintaining acceptable image quality
Solution Approach 2:
The patent implements local quality by applying different quantization parameters to different regions and chroma components. Instead of using a uniform QP for the entire image, the system divides the chroma data into multiple lists (chroma_qp_offset_list) and applies region-specific QP adjustments, allowing higher quality in important regions and stronger compression in less critical areas
2Measurement precision
If chroma quantization parameter offset information is signaled in all transform units, then coding precision is improved, but signaling overhead is increased
Solution Approach 1:
The patent applies partial action by selectively signaling chroma quantization parameter offset information only when necessary. The encoder determines whether to include chroma_qp_offset_idx in the transform unit syntax based on conditions such as whether the current transform unit uses chroma_qp_offset_cb or chroma_qp_offset_cr, avoiding redundant signaling in cases where default values are sufficient
Solution Approach 2:
The patent implements dynamics by making the signaling of chroma quantization parameter offset information adaptive rather than fixed. The encoder dynamically decides whether to signal chroma_qp_offset_idx based on the actual chroma QP values and picture characteristics, allowing the bitstream to adapt to different content types and compression requirements
Data Source
AI summary
According to the disclosure of the present document, chroma quantization parameter offset-related information can be signaled through palette syntax coding, and index information for a chroma quantization parameter offset list can be efficiently parsed/signaled on the basis of information about the number of entries in the chroma quantization parameter offset list. Accordingly, bits that are required to be signaled in order to code a video/image can be reduced, and the coding efficiency can be enhanced.