Intra Prediction Pixel-Line Filtering for Block Encoding Accuracy
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Solution Overview
Problem
Existing image compression technologies face challenges in efficiently encoding and decoding high-resolution and high-quality images, particularly in intra prediction, which affects encoding/decoding efficiency.
Innovation Solution
The method involves deriving an intra prediction mode for a current block, determining a pixel line for intra prediction, and performing filtering on a reference pixel based on a flag, with optional correction of prediction pixels using second reference pixels or weighted values, and considering sub-block partitioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If intra prediction is performed using conventional methods, then encoding/decoding can be performed, but encoding/decoding efficiency is insufficient for high-resolution and high-quality images
Solution Approach 1:
The current block is divided into multiple sub-blocks, and intra prediction is performed separately for each sub-block. This segmentation allows the prediction to adapt to local variations within the block, improving prediction accuracy while maintaining encoding efficiency through standardized processing of each sub-block
Solution Approach 2:
Different prediction modes and filtering operations are applied to different regions within the current block based on local characteristics. The prediction process considers local pixel line relationships and applies selective filtering to reference pixels, enabling localized optimization of prediction quality without processing the entire block uniformly
2Manufacturing precision
If filtering is applied to reference pixels, then prediction accuracy improves, but processing complexity increases
Solution Approach 1:
Filtering is applied selectively to reference pixels based on specific conditions rather than universally. The patent determines whether filtering is needed for each reference pixel line, applying filtering only when it will improve prediction accuracy, thus avoiding unnecessary processing complexity while maintaining prediction quality where needed
3Manufacturing precision
If correction operations are performed on prediction pixels, then prediction quality improves, but encoding/decoding time increases
Solution Approach 1:
Correction operations are performed during the prediction generation phase rather than as a separate post-processing step. The correction of prediction pixels is integrated into the intra prediction process, allowing corrections to be applied efficiently without requiring additional encoding/decoding passes or increasing overall processing time
Data Source
AI summary
An intra-frame prediction method and device, according to the present invention, enables deriving an intra-frame prediction mode of a current block, determining a pixel line, among a plurality of pixel lines, for the intra-frame prediction of the current block, and carrying out the intra-frame prediction of the current block on the basis of the intra-frame prediction mode and the pixel line. In addition, a first reference pixel of the determined pixel line may be selectively filtered, and a prediction pixel of the current block may be selectively corrected, and thus the accuracy of the intra-frame prediction may be improved.