Distributed Video Coding Pixel Block Reconstruction
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Solution Overview
Problem
Video conferencing on lightweight portable devices like mobile phones and tablets is constrained by limited computational capacity, battery life, and bandwidth limitations, requiring efficient encoding and decoding of video frames to maintain quality and speed.
Innovation Solution
A distributed video coding environment where key and non-key video frames are processed differently, with non-key frames divided into pixel blocks, and only significantly different blocks are encoded, shifting computational burden to an intermediate server for reconstruction, using techniques like singular value decomposition for compression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If video frames are fully encoded on mobile devices to maintain quality, then video reconstruction accuracy is improved, but computational load and energy consumption increase
Solution Approach 1:
The patent segments video frames into key frames and non-key frames, and further divides non-key frames into pixel blocks. Only significant pixel blocks are encoded on the mobile device, while less significant blocks are reconstructed using previous frame data. This segmentation approach reduces the computational load on mobile devices while maintaining acceptable video quality.
Solution Approach 2:
The patent introduces an intermediate server that acts as a mediator between the mobile device and the final video output. The server receives encoded data from the mobile device, reconstructs video frames using a combination of encoded pixel blocks and previous frame information, and delivers the final video stream. This intermediary handles the computationally intensive reconstruction tasks.
2Manufacturing precision
If video encoding is performed on mobile devices to maintain video quality, then video reconstruction accuracy is improved, but transmission bandwidth requirements increase
Solution Approach 1:
By segmenting video frames into key frames and non-key frames, and further dividing non-key frames into pixel blocks, the system transmits only the essential encoded information for significant blocks rather than entire frames. This reduces the total data量 that needs to be transmitted while maintaining video quality.
Solution Approach 2:
The system applies partial encoding to only the most significant pixel blocks of non-key frames, rather than encoding all blocks. The remaining blocks are reconstructed using previous frame data, which reduces the total encoding overhead and transmission requirements while maintaining acceptable video quality.
3Manufacturing precision
If all pixel blocks of non-key video frames are encoded to maintain quality, then video reconstruction accuracy is improved, but processing time increases
Solution Approach 1:
The patent segments non-key video frames into pixel blocks and classifies them as either significant or insignificant based on their difference from previous frames. Only significant pixel blocks are encoded, while insignificant blocks are reconstructed using previous frame data. This segmentation dramatically reduces processing time while maintaining video quality.
Solution Approach 2:
The system applies partial encoding to only the most significant pixel blocks rather than all blocks. By using previous frame information to reconstruct less significant blocks, the system achieves acceptable video quality with significantly reduced processing time and computational resources.
Data Source
AI summary
Systems and methods are presented for reconstructing sequences of video frames received from a sending device in a distributed video coding environment. Some of the video frames are received as key video frames fully encoded at the sending device. Others are received as non-key video frames partitioned into pixel blocks. Some of the pixel blocks are indicated for reconstruction via a corresponding previous pixel block of a previous video frame, while other pixel blocks are to be reconstructed by decoding encodings of those pixel blocks received from the sending device. Each received encoding of a pixel block is based on contents of the non-key video frame that contains the pixel block and not on contents of the previous key video frame, nor on contents of any other video frame positioned between the previous key video frame and the non-key video frame in the sequence of video frames.