CABAC Rate Controller Dynamic Load Adjustment
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Solution Overview
Problem
Digital video encoding systems face throughput limitations due to the high cost and processing requirements of context-adaptive binary arithmetic coding (CABAC) blocks, leading to potential frame dropping in critical applications like surveillance, where high-quality image transmission is essential.
Innovation Solution
A method that adjusts the compression parameter based on the actual load of the CABAC coding block, using a rate controller to determine and iteratively update the compression parameter, ensuring high image quality without frame dropping, by focusing on the actual load value rather than bitrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If CABAC coding block throughput is increased, then encoder throughput is improved, but implementation cost increases significantly
Solution Approach 1:
The patent implements dynamic adjustment of the compression parameter (QP value) based on real-time load monitoring of the CABAC coding block. The rate controller continuously monitors the load parameter and adjusts the QP value dynamically to match the actual processing capacity of the CABAC block, enabling the system to adapt throughput to available resources without hardware upgrades.
Solution Approach 2:
The patent changes the compression parameter (quantization parameter QP) to control the load on the CABAC coding block. By adjusting this parameter, the system can modulate the amount of data processed by CABAC, thereby controlling throughput and preventing overload without increasing the inherent complexity of the CABAC block itself.
2Reliability
If compression parameter is adjusted to reduce CABAC load, then frame dropping is prevented, but image quality deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the rate controller continuously monitors the actual load parameter of the CABAC coding block and uses this information to adjust the compression parameter for subsequent frames. This closed-loop control ensures that the compression level is optimized based on real-time system state, preventing both frame dropping and unnecessary quality degradation.
Solution Approach 2:
The system dynamically adjusts the compression parameter based on the actual processing load rather than using static or overly conservative compression settings. This allows the system to maintain high image quality when the CABAC block has available capacity while preventing overload when capacity is limited.
3Productivity
If rate control based on bitrate is used, then output bitrate is controlled, but processing overhead increases significantly
Solution Approach 1:
The patent extracts and monitors the actual load parameter directly from the CABAC coding block's internal state rather than estimating bitrate based on complex models. This approach simplifies the rate control mechanism by directly observing the bottleneck block's load condition and using this information to adjust compression, reducing the processing overhead associated with traditional bitrate-based rate control.
Data Source
AI summary
A method of encoding a video sequence by an encoder supporting context-based adaptive binary arithmetic coding, CABAC is disclosed. The method comprises determining, by a rate controller, a compression parameter of the encoder based on a load parameter value, indicating a current actual load of the coding block, received from the coding block.