Pseudo-analog Video Transmission with Spatial Redundancy
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Solution Overview
Problem
Conventional video compression methods fail to provide graceful video degradation in noisy environments, leading to choppy or stalled video reproduction at low Signal-to-Noise Ratio (SNR), and existing multicast solutions either increase bandwidth usage or result in reduced video quality.
Innovation Solution
A pseudo-analog transmission system that retains spatial redundancy by transmitting video frames in the spatial domain, utilizing Direct Cosine Transform (DCT) to remove L-shaped lines of coefficients for bandwidth reduction and adaptive power scaling of coefficients to enhance video reproduction quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional video compression is used to reduce data transmission, then bandwidth usage is reduced, but video quality degradation becomes non-graceful in noisy environments
Solution Approach 1:
The patent applies parameter changes by transitioning from digital compression parameters to analog-like transmission parameters. Video frames are transformed to frequency domain, scaled by power factors, and transmitted in a manner that preserves continuous signal characteristics, enabling graceful degradation while reducing bandwidth consumption compared to conventional digital compression
2Reliability
If spatial redundancy is retained for graceful degradation, then video quality in noisy environments is improved, but bandwidth usage increases
Solution Approach 1:
The patent applies local quality by selectively preserving spatial redundancy only in the spatial domain while removing it in the temporal domain. Motion-compensated temporal filtering eliminates temporal redundancy, allowing the system to maintain spatial redundancy for noise robustness without the full bandwidth cost of preserving all redundancy types
Solution Approach 2:
The patent segments the video signal processing into temporal and spatial components. By applying motion compensation to separate temporal redundancy removal from spatial redundancy preservation, the system achieves bandwidth efficiency while maintaining the spatial redundancy needed for graceful degradation in noisy channels
3Loss of energy
If L-shaped lines of coefficients are removed from frequency domain, then bandwidth usage is reduced, but video reproduction quality deteriorates
Solution Approach 1:
The patent applies partial action by selectively removing only the L-shaped lines of high-frequency coefficients from the frequency domain representation, rather than removing all high-frequency content. This partial removal achieves bandwidth reduction while preserving sufficient frequency information to maintain acceptable video reproduction quality after inverse transformation
Data Source
AI summary
Scaled video for pseudo-analog transmission in the spatial domain is described. Boundaries are determined for M L-shaped chunks of coefficients of at least one frequency-transformed video frame of a group of pictures (GOP). The boundaries are determined based at least on variances of the coefficients of the M L-shaped chunks, such as by reducing or minimizing the sum of the square roots of the variances of the coefficients. Corresponding power scale factors for the M L-shaped chunks are determined based at least partly on the variances of the coefficients of the M L-shaped chunks, and the coefficients of the M L-shaped chunks are scaled using the corresponding power scale factors. The pixel values of the frames (e.g., the frames in the spatial domain) are transmitted on a pseudo-analog channel. At the receiver, retained spatial redundancy enables denoising in the spatial domain prior to de-scaling in the frequency domain.