Adaptive Video Encoding for Wireless Display Scene Changes
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Solution Overview
Problem
In Wireless Display systems, scene changes in video data lead to an increase in the number of coding bits required, exceeding the limited bandwidth of wireless channels, resulting in incomplete transmission and visual artifacts like blockiness or tearing at sink devices.
Innovation Solution
A source device detects scene changes and reduces the number of coding bits in the encoded representation of pictures and increases the wireless channel throughput, allowing for efficient transmission of encoded representations over the wireless channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of coding bits is increased to maintain video quality after scene changes, then video quality is preserved, but the wireless channel bandwidth is exceeded resulting in incomplete transmission
Solution Approach 1:
The patent applies dynamics by making the encoding parameters adaptive rather than static. The source device dynamically adjusts the number of coding bits based on scene change detection, using normal bit allocation during stable scenes and reduced bit allocation during scene changes when motion compensation is applied, thereby resolving the contradiction between maintaining video quality and staying within bandwidth limits
Solution Approach 2:
The patent changes the parameter of coding bit allocation based on the detected scene change condition. When a scene change is detected, the system switches to a different encoding strategy with reduced bit requirements by utilizing motion compensation from the previous frame, allowing the system to adapt parameter values to resolve the bandwidth versus quality trade-off
2Device complexity
If standard encoding is used after scene changes, then encoding simplicity is maintained, but transmission completeness deteriorates due to exceeding wireless channel bandwidth
Solution Approach 1:
The patent applies preliminary action by detecting scene changes before encoding the affected frames. The source device identifies when a scene change occurs and proactively applies motion compensation encoding to those specific frames, preparing the encoding strategy in advance to ensure transmission completeness without requiring complex real-time adjustments during encoding
Solution Approach 2:
The patent applies local quality by differentiating the encoding approach for different temporal regions of the video stream. Frames following scene changes receive specialized motion-compensated encoding treatment, while other frames use standard encoding, allowing the system to apply complexity only where necessary to ensure transmission reliability
3Quantity of substance
If motion compensation is applied during scene changes, then coding bit requirements are reduced, but detection and measurement complexity increases
Solution Approach 1:
The patent applies feedback by using the detected scene change information to control the encoding process. The source device continuously monitors for scene changes and uses this feedback to dynamically adjust the encoding strategy, applying motion compensation only when scene changes are detected, thereby reducing overall bit requirements while maintaining a relatively simple detection mechanism
Data Source
AI summary
A source device in a wireless display system determines whether a scene change has occurred between a first picture and a second picture prior to transmitting an encoded representation of the second picture to a sink device. The scene change occurs when the first picture and the second picture are sufficiently dissimilar. The source device may reduce, in response to determining that the scene change has occurred, a number of coding bits in the encoded representation of the second picture. Furthermore, in response to determining that the scene change has occurred, the source device increases a throughput of a wireless channel. After reducing the number of coding bits in the encoded representation of the second picture and increasing the throughput of the wireless channel, the source device transmits the encoded representation of the second picture to the sink device via the wireless channel.