Video Decoding Device Partial Refresh Display Delay
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Solution Overview
Problem
In video coding, gradual refresh methods do not provide a clear means for a video decoding device to identify partially refreshed areas, leading to display delays and reduced video quality, especially when exact matching of decoded images is not required.
Innovation Solution
A video decoding device that demultiplexes a bitstream to extract supplemental enhancement information indicating leading pictures and completed refresh segments, allowing for partial display before synchronization completion without increasing computation or reducing quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If gradual refresh method is used without explicit segment information, then compression efficiency is improved, but display delay increases and video quality deteriorates
Solution Approach 1:
The patent extracts only the necessary refresh segment information from the bitstream rather than transmitting complete picture data. The decoding device identifies refresh segments through selective extraction of segment identifiers and reference picture information, enabling partial display without waiting for complete synchronization while maintaining compression efficiency.
Solution Approach 2:
The patent performs preliminary identification of refresh segments during the decoding process. The decoding device预先 determines which segments are refreshed by checking segment identifiers and reference picture indicators before complete picture synchronization is achieved, allowing early partial display of refreshed areas.
2Device complexity
If gradual refresh method is used without explicit segment information, then bitstream complexity is reduced, but video quality deteriorates
Solution Approach 1:
The patent applies local quality by providing explicit refresh segment information only where needed in the bitstream. Instead of uniform high-complexity encoding throughout, the system selectively inserts segment identifiers and reference picture indicators at relevant positions, reducing overall bitstream complexity while maintaining video quality in refreshed areas through targeted information provision.
3Loss of time
If partial display is enabled without explicit refresh information, then computation amount increases, but display delay is reduced
Solution Approach 1:
The patent enables the decoding device to self-identify refresh segments through simple bitstream indicators rather than requiring complex external analysis. The segment identifiers and reference picture indicators in the bitstream allow the decoder to autonomously determine which areas are refreshed and can be displayed early, reducing computation amount while enabling partial display.
Data Source
AI summary
A video decoding device includes a demultiplexing unit which demultiplexes a video bitstream including video data of an encoded slice, Supplemental-Enhancement-Information having first information indicating a refresh group of segments in gradual refresh, and Supplemental-Enhancement-Information having second information indicating segments where a refresh has completed in a current picture, an extracting unit which extracts the second information from a message which is part of the demultiplexed Supplemental-Enhancement-Information, and a video decoding unit which decodes image data from the demultiplexed video bitstream by using at least inter picture prediction.