Video Decoding Apparatus Region Splitting for Coding Efficiency and Delay
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Solution Overview
Problem
Existing video coding schemes face challenges in maintaining coding efficiency and minimizing delay, particularly with intra pictures, where significant code amounts are generated, leading to transmission delays and deteriorated coding efficiency.
Innovation Solution
A video decoding apparatus splits a picture into restricted and non-restricted regions, using intra prediction within the restricted region and inter prediction referencing the restricted region of a reference picture, and configuring the restricted region as a reference for subsequent decoding, allowing for efficient coding and reduced delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If entire picture is coded by intra prediction, then coding efficiency is improved, but code amount becomes significantly large causing transmission delay
Solution Approach 1:
The picture is divided into multiple regions (first region and second region) with different prediction methods. The first region uses intra prediction for coding efficiency, while the second region uses inter prediction to reduce code amount and transmission delay. This segmentation allows simultaneous optimization of both coding efficiency and transmission speed.
Solution Approach 2:
Different prediction qualities are applied to different regions of the picture. The first region receives high-quality intra prediction for areas requiring detailed reconstruction, while the second region uses lower-quality inter prediction for areas where compression is prioritized. This local differentiation resolves the contradiction between coding efficiency and transmission delay.
2Loss of time
If intra prediction is performed for multiple pictures gradually, then transmission delay is reduced, but coding efficiency deteriorates
Solution Approach 1:
The picture is segmented into multiple regions that can be processed independently with different prediction methods. This allows the system to perform intra prediction gradually across multiple pictures for delay reduction while maintaining coding efficiency in the first region through optimized intra prediction coding.
Solution Approach 2:
Instead of performing intra prediction for the entire picture, only the first region is coded with intra prediction while the second region uses inter prediction. This partial application of intra prediction reduces the code amount sufficiently to minimize transmission delay while preserving coding efficiency in the most critical areas.
3Loss of time
If only part of picture is coded by intra prediction, then transmission delay is minimized, but coding efficiency deteriorates compared to entire picture intra prediction
Solution Approach 1:
The patent applies different prediction qualities to different regions. The first region receives high-quality intra prediction where coding efficiency is most important, while the second region uses inter prediction where transmission delay reduction is prioritized. This local differentiation allows the system to achieve both minimized delay and maintained efficiency.
Solution Approach 2:
The patent merges intra prediction and inter prediction methods within the same picture by dividing it into multiple regions. The first region uses intra prediction and the second region uses inter prediction, combining the advantages of both methods to simultaneously reduce transmission delay and maintain coding efficiency.
Data Source
AI summary
In a scheme in which only a part of one picture is intra-predicted and the rest of the region is inter-predicted, generation of a significant code amount and generation of a delay can be avoided in a specific picture. However, because only a part of the picture is coded by means of the intra prediction, coding efficiency is deteriorated as compared to an I picture in which the entire picture is coded by means of the intra prediction. A picture is split into a restricted region and a non-restricted region. Prediction is performed by using an intra prediction in which only a pixel of the restricted region is referred to or an inter prediction in which a restricted reference region of a reference picture is referred to for a block of the restricted region. Prediction is performed by using the intra prediction in which a decoded pixel in the picture is referred to or the inter prediction in which the reference picture is referred to for the block of the non-restricted region. After decoding of the picture, the restricted region is configured as the restricted reference region.