Video Stream Rate Reduction via Non-Reference Picture Duplication
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for reducing the bit rate of video streams, such as re-quantization and re-encoding, are costly and processing-heavy, necessitating the development of more efficient techniques for rate reduction in compressed video streams.
Innovation Solution
The method involves selecting non-reference pictures in a video stream and replacing them with duplicating pictures that are smaller and instruct the decoder to duplicate another picture, utilizing techniques like generating motion vector fields indicative of lack of motion, and encoding schemes that represent zero motion vectors concisely, thereby reducing bit rate without affecting the decoding of other pictures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If re-quantization and re-encoding are used for rate reduction, then bit rate is reduced, but computational cost and processing complexity increase significantly
Solution Approach 1:
The patent applies the copying principle by replacing non-reference pictures with duplicating pictures that reference existing reference pictures. Instead of fully encoding each non-reference picture, the system creates compact representations that instruct the decoder to copy data from reference pictures, significantly reducing bit rate while avoiding expensive re-encoding operations.
Solution Approach 2:
The patent extracts only the essential information needed to represent non-reference pictures by removing redundant data. By identifying and eliminating motion vector fields and other redundant elements in non-reference pictures, the system achieves rate reduction without requiring full re-encoding, thus lowering computational cost while maintaining acceptable video quality.
2Quantity of substance
If non-reference pictures are discarded and replaced with duplicating pictures, then bit rate is significantly reduced, but video quality may deteriorate
Solution Approach 1:
The patent applies local quality by differentiating between reference pictures and non-reference pictures in terms of encoding precision. Reference pictures are encoded with high quality to serve as accurate bases for duplication, while non-reference pictures use simplified duplicating representations. This localized approach to quality ensures that the most important pictures maintain high fidelity while reducing overall bit rate through selective simplification.
Data Source
AI summary
A method for rate reduction of a video stream, the method includes: selecting a non-reference picture of a video stream; and replacing the non-reference picture by a duplicating picture that substantially consists of information that instruct a decoder to duplicate another picture that differs from the non-reference picture; wherein the duplicating picture is smaller than the non-reference picture.