Inter Prediction Using Dual Reference Blocks for Image Noise Reduction
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Solution Overview
Problem
Existing inter prediction methods in image encoding and decoding suffer from image quality deterioration due to noise in residual signals, which affects the reconstruction of images.
Innovation Solution
The method involves determining at least one prediction block in an image, a first motion vector, a first reference block, and a second reference block, and performing inter prediction using both blocks to reduce noise and improve prediction performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If general inter prediction with one or two reference pictures is used, then the encoding/decoding process is simple, but image quality deteriorates due to noise in residual signals
Solution Approach 1:
The patent segments the reference picture selection process by introducing multiple reference pictures (first reference picture and second reference picture) with different motion vectors. This allows the system to divide the prediction task across multiple reference sources, reducing noise impact while maintaining manageable complexity through structured selection processes.
Solution Approach 2:
The patent changes the parameter of reference picture selection by dynamically determining which reference picture (first or second) to use based on motion vector characteristics and picture conditions. This parameter change enables adaptive noise reduction while maintaining encoding efficiency, resolving the contradiction between simplicity and quality.
2Manufacturing precision
If multiple reference pictures are used for inter prediction, then image quality improves by reducing noise, but the complexity of determining reference blocks increases
Solution Approach 1:
The patent applies preliminary action by pre-determining motion vectors for both first and second reference pictures before the actual prediction process. This advance preparation organizes the complexity upfront, making the subsequent reference block selection more straightforward and manageable while achieving better image quality through multiple reference sources.
Solution Approach 2:
The patent introduces dynamics by making the reference picture selection adaptive rather than fixed. The system dynamically selects between first and second reference pictures based on motion characteristics and picture conditions, allowing the complexity to be managed through intelligent adaptation rather than exhaustive processing of all possible references.
3Productivity
If a single reference picture is used for prediction, then the encoding process is efficient, but prediction accuracy decreases due to noise in the residual signal
Solution Approach 1:
The patent merges information from multiple reference pictures (first reference picture and second reference picture) into the prediction process. By combining predictions from multiple sources with different motion vectors, the system achieves better prediction accuracy that reduces residual noise, while maintaining encoding efficiency through selective merging rather than processing all possible combinations.
Data Source
AI summary
Provided is an image decoding method including: determining at least one prediction block included in a current picture from among pictures forming an image; determining a first motion vector related to a current prediction block from among the at least one prediction block; determining a first reference block included in a first reference picture, based on the first motion vector; determining a second reference block included in a second reference picture, based on a location of the first reference block; and decoding the current picture by performing inter prediction on the current prediction block by using at least one of the first reference block and the second reference block, wherein the second reference picture includes a prediction value of the first reference picture. Also, provided are an image decoding apparatus performing the image decoding method, and an image encoding method and apparatus corresponding to the image decoding method and apparatus.