Image Intra Prediction With Adaptive Reference Pixel Lines
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Solution Overview
Problem
Conventional intra prediction techniques in image encoding/decoding suffer from inefficiencies due to the use of single reference pixel lines and fixed interpolation schemes, leading to errors and discontinuities between prediction blocks and surrounding regions, as well as the need to encode significant information about prediction modes.
Innovation Solution
The method and apparatus adaptively select multiple reference pixel lines and interpolation schemes based on position and intra prediction mode, deriving predicted values and encoding relevant index information to improve intra prediction efficiency and reduce discontinuities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional intra prediction uses single reference pixel line and fixed interpolation scheme, then device complexity is reduced, but manufacturing precision (prediction accuracy) deteriorates
Solution Approach 1:
The patent applies dynamics by making the reference pixel line selection and interpolation scheme adaptive rather than fixed. The system dynamically selects from multiple reference pixel lines (e.g., first, second, third reference lines) and multiple interpolation schemes based on the specific block characteristics and position, allowing the prediction process to adapt to different scenarios and improve accuracy without requiring a completely complex fixed structure
Solution Approach 2:
The patent changes parameters by introducing multiple reference pixel lines and multiple interpolation schemes with different parameters. Instead of using a single reference line and fixed interpolation method, the system varies the reference line selection and interpolation parameters adaptively, enabling more precise predictions while managing complexity through structured parameter variation
2Reliability
If conventional intra prediction uses single reference pixel line, then device complexity is reduced, but reliability (continuity between prediction block and surrounding region) deteriorates
Solution Approach 1:
The system dynamically selects among multiple reference pixel lines (first, second, third reference lines) based on the block position and characteristics. This dynamic selection allows the system to adapt to different regions and maintain better continuity with surrounding areas, improving reliability while managing complexity through adaptive rather than exhaustive processing
Solution Approach 2:
The patent applies local quality by using different reference pixel lines for different regions or blocks within the image. Instead of uniformly applying a single reference line to all blocks, the system selects appropriate reference lines locally based on position and characteristics, ensuring better continuity and reliability in each specific region while avoiding the complexity of processing all reference lines for all blocks
3Measurement precision
If conventional intra prediction encodes significant information about prediction modes, then measurement precision (prediction mode identification) is improved, but loss of information (bitstream overhead) increases
Solution Approach 1:
The patent applies partial action by not encoding all possible prediction mode information explicitly in the bitstream. Instead of transmitting complete prediction mode details for every block, the system uses adaptive selection from predefined reference lines and interpolation schemes, encoding only necessary indices or flags while relying on the decoder to reconstruct the same prediction modes using the same adaptive logic
Solution Approach 2:
The system uses self-service by enabling the decoder to independently determine the same prediction mode as the encoder through adaptive selection from multiple reference lines and interpolation schemes. The encoder and decoder both apply the same adaptive logic locally, allowing the decoder to self-determine prediction modes without requiring extensive explicit signaling, thereby reducing bitstream overhead while maintaining accurate prediction mode identification
Data Source
AI summary
Disclosed are an image encoding/decoding method and apparatus. The method and apparatus select at least one reference pixel line from among multiple reference pixel lines and derive a predicted value of a pixel within a current block by using the value of at least one pixel within the selected reference pixel line(s). Alternatively, the method and apparatus derive an intra prediction mode of a reconstructed pixel region on the basis of a reference pixel region of at least one reconstructed pixel region, derive an intra prediction mode of a current block on the basis of the derived intra prediction mode of the reconstructed pixel region, obtain an intra prediction block of the current block by using the derived intra prediction mode, and reconstruct the current block by summing the obtained intra prediction block and a residual block of the current block.