Inter-layer Video Illumination Compensation for Encoding Efficiency
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Solution Overview
Problem
Current video codecs face challenges in efficiently encoding and decoding high-resolution or high-quality video content, particularly in managing illumination differences between inter-layer images, which affects encoding efficiency and data transmission amounts.
Innovation Solution
An inter-layer video encoding and decoding method that determines whether to perform illumination compensation based on image characteristics, specifically for blocks of a predetermined partition type and prediction mode, using inter-layer prediction information and reference blocks to adjust illumination and reduce residual prediction, thereby optimizing encoding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If illumination compensation is performed for all blocks in inter-layer video encoding, then video quality is improved, but calculation load and encoding complexity increase
Solution Approach 1:
The patent applies illumination compensation selectively only to blocks that exhibit significant illumination differences between layers, rather than uniformly to all blocks. The encoder determines whether to apply illumination compensation on a per-block basis by comparing reference blocks and evaluating illumination characteristics, thereby improving video quality where needed while reducing unnecessary computational overhead in blocks where illumination compensation is not beneficial.
2Productivity
If illumination compensation is performed for all blocks, then coding efficiency is improved, but data transmission amount increases
Solution Approach 1:
The patent transmits illumination compensation parameters only for blocks where illumination differences are detected, rather than transmitting data for all blocks. The encoder identifies blocks requiring compensation and transmits relevant parameters (such as illumination compensation factors) only for those specific blocks, thereby improving coding efficiency for problematic areas while minimizing the increase in data transmission amount.
Solution Approach 2:
The patent applies illumination compensation partially rather than universally - it performs compensation only to the extent necessary for blocks with significant illumination differences. By using a threshold-based approach and selective application, the patent achieves sufficient coding efficiency improvement without the excessive data transmission that would result from applying compensation to all blocks without distinction.
3Productivity
If illumination compensation is applied selectively based on block characteristics, then calculation load is reduced, but video quality may deteriorate in compensated blocks
Solution Approach 1:
The patent incorporates a feedback mechanism where the encoder evaluates illumination characteristics of reference blocks and determines whether illumination compensation should be applied based on detected differences. The system continuously assesses illumination conditions and adjusts compensation application accordingly, ensuring that video quality is maintained in blocks where compensation is beneficial while avoiding quality degradation in blocks where compensation is not appropriate. This feedback-driven approach optimizes the balance between calculation load and video quality.
Data Source
AI summary
Provided are an inter-layer video encoding method and apparatus therefor and an inter-layer video decoding method and apparatus therefor. An inter-layer video decoding method involves reconstructing a first layer image, based on encoding information obtained from a first layer bitstream; in order to reconstruct a second layer block determined as a predetermined partition type and to be in a prediction mode, determining whether to perform illumination compensation for the reconstructed second layer block determined by using a first layer reference block that is from among the reconstructed first layer image and corresponds to the second layer block; and generating the reconstructed second layer block by using inter-layer prediction information obtained from a second layer bitstream and the first layer reference block, and generating a second layer image including the reconstructed second layer block whose illumination is determined according to whether the illumination compensation was performed.