Picture and Video Data Streams for Subarea Reduction Without Transcoding
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Solution Overview
Problem
Existing video codecs lack efficient scalability in terms of scene sectioning and computationally complex methods for handling non-rectangular picture areas, and random access points cause bitrate peaks that increase access time.
Innovation Solution
A video data stream is modified to include an indication of a predetermined subarea, replacement indices, and adjusted coding parameters to remove external areas and measure locations from the subarea's circumference, allowing for a reduced payload portion with subarea-specific pictures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If video data streams are reduced by removing enhancement layers, then temporal/spatial resolution scalability is achieved, but scene sectioning scalability remains computationally complex
Solution Approach 1:
The video picture is divided into multiple subareas (e.g., tiles or regions) that can be independently coded and decoded. Each subarea can be treated as a separate picture unit, allowing selective extraction and reduction of specific scene portions without processing the entire video stream, thereby reducing computational complexity for scene sectioning.
Solution Approach 2:
Different coding parameters and enhancement layers are applied to different subareas of the picture. This allows selective reduction of specific regions (e.g., removing enhancement layers from certain subareas) while maintaining quality in others, enabling efficient scene-specific scalability without global reprocessing.
2Ease of operation
If random access points are provided frequently, then random access capability is improved, but bitrate peaks increase
Solution Approach 1:
The video stream is segmented into multiple independently decodable subarea streams. Each subarea can serve as an independent random access point, allowing viewers to jump to any subarea without requiring a full picture random access point, thereby reducing the frequency and bitrate impact of random access points while maintaining access capability.
3Productivity
If picture content is coded in non-rectangular areas, then coding efficiency for panoramic content is improved, but compatibility with rectangular picture areas decreases
Solution Approach 1:
The patent introduces a second dimension of organization by dividing the picture into multiple subareas that can be arranged in different spatial configurations. This allows non-rectangular picture content to be represented as a collection of rectangular subareas, maintaining compatibility with standard rectangular coding while enabling efficient representation of panoramic and irregularly shaped content through the subarea arrangement.
Data Source
AI summary
A video data stream is rendered reducible in a manner so that the reduction leads to a restriction of pictures of the reduced video data stream to merely a predetermined subarea of the pictures of the original video data stream and in a manner so that transcoding, such as re-quantization, may be avoided and a conformance of the reduced video data stream relative to the codec underlying the original video data stream be maintained. This is achieved by providing the video data stream with information including an indication of the predetermined subarea and replacement indices for redirecting the indices included by the payload portion so as to refer to, and/or replacement parameters for adjusting the first set of coding parameter settings so as to result in, a second set of coding parameter settings.