Mode-Adaptive Reference Pixel Smoothing for Video Compression
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Solution Overview
Problem
Existing video coding technologies, such as HEVC, do not effectively utilize mode-dependent smoothing of reference pixels in angular intra prediction, leading to suboptimal compression efficiency.
Innovation Solution
Implement mode adaptive smoothing of reference pixels based on the intra prediction mode, using specific filters for different prediction angles, and optionally signaled by a smoothing flag, to improve prediction accuracy and reduce bit rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mode adaptive smoothing filter is applied to reference pixels, then prediction accuracy and compression efficiency are improved, but processing complexity increases
Solution Approach 1:
The patent applies different smoothing filter strengths (strong, medium, weak, or no filtering) to different intra prediction modes based on their specific characteristics. This local quality approach ensures that each prediction mode receives the appropriate level of smoothing optimization, improving prediction accuracy for modes that benefit from smoothing while avoiding unnecessary processing for modes that do not require it.
Solution Approach 2:
The patent dynamically selects the smoothing filter strength based on the intra prediction mode being used. The filtering strength is not fixed but adapts according to the prediction mode, allowing the system to optimize between processing complexity and prediction accuracy in real-time based on the specific coding situation.
2Productivity
If smoothing filter is applied to reference pixels, then compression efficiency is improved, but computational load increases
Solution Approach 1:
The patent applies smoothing filters selectively based on the intra prediction mode. Only certain prediction modes receive strong smoothing, while others receive medium or weak filtering, and some receive no filtering at all. This selective application improves compression efficiency for modes that benefit from smoothing while minimizing the computational load increase.
Solution Approach 2:
The patent changes the filtering parameter (filter strength) based on the intra prediction mode. By adjusting the smoothing filter strength parameter dynamically according to the prediction mode, the system optimizes compression efficiency while controlling computational requirements through parameter adaptation rather than uniform heavy filtering.
Data Source
AI summary
A method for decoding an encoded video bit stream in a video decoder is provided that includes decoding an intra prediction mode for a block of pixels encoded in the video bit stream, determining, based on the intra prediction mode, whether or not a smoothing filter is to be applied to reference pixel values used for intra prediction of the block, applying a smoothing filter to the reference pixel values when a result of the determining is that a smoothing filter is to be applied, and performing intra prediction according to the intra prediction mode using the smoothed reference pixel values to generate a predicted block of pixels.