Transform Unit Coefficient Indexing for Video Coding
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Solution Overview
Problem
Current video encoding and decoding systems require significant storage and processing capacity due to the large volumes of data involved in high-efficiency video coding, particularly with the transition to high-definition media programs, necessitating a method to reduce storage and processing demands.
Innovation Solution
A method and apparatus that determine if all coefficients of a transform unit are zero, setting a flag accordingly, and using this flag to optimize the encoding and decoding process by skipping the processing of zero coefficients, thereby reducing the bitstream size and processing requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all coefficients of transform units are encoded and stored in high-efficiency video coding systems, then video quality and compression accuracy are improved, but storage capacity and processing requirements increase significantly
Solution Approach 1:
The patent extracts and identifies zero coefficients from the transform unit coefficient array, separating them from non-zero coefficients. By detecting positions where all coefficients are zero and extracting this information, the system avoids encoding and storing redundant zero values, thereby reducing data volume while maintaining video quality through selective encoding of only significant coefficients
Solution Approach 2:
The patent changes the encoding parameter by introducing a flag variable that indicates whether a portion contains only zero coefficients. This parameter change allows the system to switch between different encoding modes: when the flag is set, the system skips encoding that portion entirely; when not set, normal encoding proceeds. This dynamic parameter adjustment optimizes the balance between video quality and data compression
2Loss of information
If all coefficients are processed and stored in encoders and decoders, then complete video information is preserved, but processing capacity and computational load increase
Solution Approach 1:
The patent performs preliminary detection of zero coefficient portions before the main encoding process. By scanning the transform unit coefficient array in advance and identifying regions where all coefficients are zero, the system prepares flag variables that guide subsequent encoding operations. This preliminary action prevents unnecessary processing of zero coefficients during the main encoding pipeline, reducing computational load while ensuring no important information is lost
Solution Approach 2:
The patent applies partial action by encoding only the necessary portions of the transform unit coefficient array. Instead of processing all coefficients uniformly, the system selectively encodes only portions that contain non-zero coefficients, using flag variables to indicate which portions should be skipped. This partial processing approach maintains video information completeness for significant coefficients while dramatically reducing processing capacity requirements
3Productivity
If a flag system is implemented to detect zero coefficients, then data compression is improved, but device complexity increases
Solution Approach 1:
The patent segments the transform unit coefficient array into multiple portions that can be independently analyzed and encoded. Each portion is associated with a flag variable that indicates whether it contains only zero coefficients or has non-zero coefficients requiring encoding. This segmentation allows the encoder to process different portions independently, applying compression optimizations to zero-only portions while maintaining full encoding for non-zero portions, thereby improving overall compression efficiency with manageable complexity through modular design
Data Source
AI summary
A method, apparatus, article of manufacture, and a memory structure for encoding and decoding transform unit coefficients is disclosed. In one embodiment, the encoding of the transform unit coefficients is performed by determining if all of the coefficients of a portion of the transform unit disposed on a portion of a scan pattern are zero, setting a flag associated with the portion of the transform unit to a first value if at least one of the coefficients of the portion of the transform unit coefficients disposed on the portion of the scan pattern are non-zero, and setting the flag associated with the portion of the transform unit coefficients to a second value if all of the coefficients of the portion of the transform unit coefficients disposed in the portion of the scan pattern are zero.