Same-Picture Reference for Video Decoding
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Solution Overview
Problem
Current video coding standards face inefficiencies in motion compensation when dealing with intra pictures, as they lack the ability to use the currently processing picture as a reference, leading to suboptimal prediction and increased computational complexity.
Innovation Solution
The solution involves allowing the current picture to be used as a reference for motion compensation by adding it to the reference picture list and utilizing pixel padding for unknown pixels, enabling inter prediction within the same picture, which simplifies the decoding process and improves coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motion compensation is performed using only previously coded pictures, then reference picture availability is maintained, but coding efficiency deteriorates for intra pictures
Solution Approach 1:
The patent dynamically adjusts the reference picture list based on the current picture type. For intra pictures, it enables the current picture to be added to the reference picture list, allowing motion compensation to use the current picture as reference. This dynamic adaptation resolves the contradiction by maintaining reliability for inter pictures while improving coding efficiency for intra pictures through same-picture reference.
2Adaptability or versatility
If intra prediction is used for all intra pictures, then reference picture constraints are satisfied, but coding efficiency deteriorates compared to inter prediction
Solution Approach 1:
The patent makes the reference picture list universal by allowing it to contain both previously coded pictures and the current picture. This enables the decoder to use either inter prediction (from previous pictures) or same-picture prediction (from current picture) depending on the situation, achieving multi-functionality that resolves the contradiction between constraint satisfaction and coding efficiency.
3Measurement precision
If the current picture is added to the reference picture list, then prediction accuracy improves, but memory requirements and processing complexity increase
Solution Approach 1:
The patent applies local quality by selectively adding the current picture to the reference picture list only for intra pictures where same-picture prediction is beneficial. For inter pictures, the traditional approach of using only previously coded pictures is maintained. This localized application resolves the contradiction by improving prediction accuracy only where needed without universally increasing complexity.
Data Source
AI summary
Digitally encoded pictures may be decoded by padding all un-decoded pixels within a currently decoding picture with temporary pixel values to produce a padded picture and performing motion compensation using the padded picture as a reference picture.