Picture Header Prediction Flags for Lower-Overhead Video Decoding
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Solution Overview
Problem
The increasing demand for high-resolution, high-quality image/video data, particularly in virtual reality and augmented reality, leads to higher transmission and storage costs due to the increased amount of information required, necessitating a more efficient compression technique.
Innovation Solution
A method and apparatus for enhancing image/video coding efficiency by optimizing inter prediction and intra prediction processes, reducing unnecessary signaling, and skipping irrelevant flags in the coding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high resolution and high quality image/video data are transmitted, then image quality is improved, but transmission cost increases
Solution Approach 1:
The patent extracts and transmits only the essential information needed for image reconstruction by performing prediction operations. The encoder generates prediction samples using intra-prediction or inter-prediction and transmits only the difference between the actual image data and prediction samples, rather than transmitting the complete high-resolution image data, thereby reducing transmission cost while maintaining image quality.
Solution Approach 2:
The patent changes the representation parameters of image data by transforming the image into a predictive form. Instead of transmitting raw pixel data, the system transmits prediction mode indicators and residual data, changing the parameter space from direct pixel values to predictive coefficients and differences, which requires fewer bits for high-quality reconstruction.
2Manufacturing precision
If more information is transmitted for high resolution image/video, then image quality is improved, but storage cost increases
Solution Approach 1:
The patent extracts only the necessary information for reconstructing high-quality images by using prediction techniques. The encoder stores and transmits only the residual data (difference between actual and predicted values) along with prediction mode information, rather than storing complete high-resolution image data, thereby reducing storage cost while preserving image quality.
3Productivity
If inter prediction and intra prediction are performed, then compression efficiency is improved, but signaling overhead increases
Solution Approach 1:
The patent applies partial action by selectively performing prediction operations only where beneficial. The encoder determines the appropriate prediction mode (intra or inter) for each block and applies only the necessary prediction and signaling for that block, avoiding unnecessary prediction operations and their associated signaling overhead in regions where simple coding suffices.
Solution Approach 2:
The patent segments the image into multiple blocks and applies different prediction strategies to different segments. Each block is independently analyzed and assigned the most appropriate prediction mode, allowing the system to optimize compression efficiency for each segment while minimizing the total signaling overhead across the entire image by only transmitting necessary mode indicators for each segment.
Data Source
AI summary
A video decoding method performed by a video decoding device according to the present document may comprise the steps of: acquiring image information from a bitstream, the image information including a picture header associated with the current picture including a plurality of slices; parsing, from the picture header, at least one of a first flag indicating whether information necessary for an inter-prediction operation for a decoding process is present in the picture header, or a second flag indicating whether information necessary for an intra-prediction operation for the decoding process is present in the picture header; generating prediction samples by performing at least one of intra-prediction or inter-prediction for the slices in the current picture on the basis of at least one of the first flag or the second flag; and generating reconstructed samples on the basis of the prediction samples.