Video Conference Frame Selection for Bandwidth Reduction
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Solution Overview
Problem
Conventional video compression methods in video conference systems require significant bandwidth, which is not suitable for applications with limited internet access, such as dial-up or wireless mobile phones, as they do not efficiently manage bandwidth usage for acceptable image quality.
Innovation Solution
A method that detects acute movements in video frames and only compresses and transmits those frames, while omitting frames with no sudden movements, and synchronizes missing images with audio data for reconstruction on the receiving end, reducing bandwidth requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional video compression methods are used, then image quality can be maintained, but bandwidth consumption is too high for limited internet access
Solution Approach 1:
The patent extracts only the essential information from video frames by detecting acute movements and transmitting only those frames with significant changes. This selective extraction approach maintains necessary image quality while dramatically reducing bandwidth consumption compared to conventional compression methods that process all frames.
Solution Approach 2:
Instead of compressing and transmitting all video frames, the patent applies partial action by processing only a subset of frames - specifically those containing acute movements. This partial processing approach achieves acceptable image quality for critical moments while minimizing bandwidth usage during static periods.
2Loss of information
If all video frames are compressed and transmitted, then complete video information is preserved, but bandwidth requirements become unacceptably high
Solution Approach 1:
The system extracts only frames with acute movements using motion detection algorithms, transmitting minimal necessary information while reconstructing complete video playback at the receiver end. This extraction strategy prevents information loss for critical frames while avoiding transmission of redundant static frames.
Solution Approach 2:
The patent performs preliminary motion detection and frame selection at the transmitter before compression. By identifying which frames contain acute movements in advance, the system prepares only necessary frames for compression and transmission, reducing overall bandwidth requirements while preserving essential video information.
3Quantity of substance
If motion detection is added to select frames for transmission, then bandwidth is reduced, but system complexity increases
Solution Approach 1:
The patent segments the video processing task into distinct functional modules: motion detection module, frame selection module, compression module, and reconstruction module. This segmentation allows each component to be optimized independently and simplifies the overall system architecture by creating clear separation of concerns.
Solution Approach 2:
Motion detection is performed as a preliminary action before compression and transmission. By detecting acute movements in advance and selecting only relevant frames, the system simplifies subsequent processing steps and reduces the load on compression algorithms, making the overall system more manageable despite the added detection step.
Data Source
AI summary
Techniques for compressing video stream in a video conference are disclosed. According to one aspect of the techniques, the method comprises obtaining a frame image sequence and selecting a reference frame image; determining whether an N-th frame image has acute movements relative to the reference frame image according to a predetermined threshold; and if yes, compressing and transmitting the N-th frame image; otherwise, not compressing and transmitting the N-th frame image; increasing N by 1 and repeating the above operations till the frame image sequence is over.