Video Transform Block Decoding Using Unified Coefficient Group Size
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Solution Overview
Problem
Existing video coding technologies face challenges in efficiently processing and decoding transform blocks, particularly due to feedback dependencies and high memory bandwidth requirements, especially in high sample rate video formats.
Innovation Solution
A method for decoding transform blocks in a video bitstream that involves determining the chroma format and coefficient group size based on the transform block size, independent of the color plane and subsampling, and using a single table for transform blocks across luma and chroma color planes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If transform blocks are processed using traditional methods that consider color plane and subsampling, then processing accuracy is maintained, but device complexity and processing time increase
Solution Approach 1:
The patent applies universality by creating a single coefficient group size table that serves both luma and chroma transform blocks. Instead of maintaining separate tables for different color planes and subsampling configurations, the invention uses one unified table that can accommodate all transform block types, thereby reducing device complexity while maintaining decoding accuracy and improving throughput.
Solution Approach 2:
The patent changes the parameter approach by determining coefficient group size based solely on transform block size rather than considering color plane type or subsampling factors. This parameter simplification reduces the complexity of the processing system while maintaining the necessary decoding accuracy, directly addressing the technical contradiction between productivity and device complexity.
2Measurement precision
If multiple tables are used for different color planes and subsampling configurations, then processing precision is maintained, but memory bandwidth requirements and processing time increase
Solution Approach 1:
The invention eliminates the need for multiple separate tables by creating a universal coefficient group size table that works for all color planes and subsampling configurations. This single table approach maintains decoding precision while significantly reducing the time required to access and process coefficient group sizes, as there is no need to switch between different tables based on color plane or subsampling type.
3Reliability
If chroma format and subsampling information are considered in coefficient group size determination, then decoding accuracy is maintained, but feedback dependencies and memory bandwidth usage increase
Solution Approach 1:
The patent fundamentally changes the parameters used for coefficient group size determination by excluding chroma format and subsampling information. The new approach uses only transform block size as the determining factor, which simplifies the feedback dependencies and reduces memory bandwidth requirements while maintaining sufficient decoding accuracy through the unified table approach.
Data Source
AI summary
A system and method of decoding a transform block for a colour channel of an image frame from a video bitstream. The method comprises determining a chroma format of the image frame, the chroma format having chroma channels of the image frame being subsampled relative to a luma channel of the image frame; determining a coefficient group size of the transform block, the coefficient group size being a largest area of the transform block of up to 16 samples, the coefficient group size being determined based only on the transform block size and independent of both (i) a colour plane of the transform block and (ii) colour plane subsampling due to the determined chroma format; and decoding the transform block using coefficient groups of the determined size from the video bitstream.