Video Decoding Early Inverse Transform Determination
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Solution Overview
Problem
Conventional video decoding methods require completing residual decoding of a coding unit before determining the information needed for inverse transform, leading to delayed coefficient transmission and increased buffer requirements for the inverse scan circuit.
Innovation Solution
Implementing an early determination scheme in the video decoding apparatus to determine whether to decode syntax elements lfnst_idx and mts_idx before residual decoding is completed, allowing for earlier coefficient transmission to the inverse transform circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If residual decoding is completed before determining information for inverse transform, then decoding accuracy is ensured, but coefficient transmission is delayed and buffer requirement increases
Solution Approach 1:
The patent applies preliminary action by determining whether to decode inverse transform information (lfnst_idx and mts_idx) before completing residual decoding. The entropy decoding circuit checks syntax elements at an earlier stage rather than waiting for residual decoding to finish, enabling the inverse transform circuit to prepare coefficients in advance and reducing transmission delay while maintaining decoding accuracy through subsequent verification
2Reliability
If residual decoding is completed before determining information for inverse transform, then decoding accuracy is ensured, but buffer requirement for inverse scan circuit increases
Solution Approach 1:
The patent reduces buffer requirements by performing preliminary determination of inverse transform information before residual decoding completes. The entropy decoding circuit checks syntax elements (lfnst_idx and mts_idx) at an earlier stage, allowing the inverse scan circuit to allocate buffers more efficiently and transmit coefficients without requiring large buffers to hold incomplete decoding results
3Productivity
If syntax elements lfnst_idx and mts_idx are decoded early, then coefficient transmission is accelerated, but decoding complexity increases
Solution Approach 1:
The patent accelerates coefficient transmission by implementing preliminary determination of syntax elements lfnst_idx and mts_idx before residual decoding completes. The entropy decoding circuit checks these syntax elements at an earlier stage, enabling the inverse transform circuit to receive and process coefficients faster, thereby improving productivity while the structured approach to checking syntax elements keeps the added complexity manageable
Data Source
AI summary
A video decoding method includes: before residual decoding of a coding unit is completed, referring to available information to determine whether to decode information that an inverse transform (IT) circuit needs for applying inverse transform to transform blocks of the coding unit, and generating a determination result; and controlling coefficient transmission of the coding unit to the IT circuit according to the determination result.