Compression of turbulence-affected video signals

Shahar Mahpod, Yitzhak Yitzhaky

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

A video signal obtained through a relatively long-distance atmospheric medium suffers from blur and spatiotemporal image movements caused by the air turbulence. These phenomena, which reduce the visual quality of the signal, reduce also the compression rate for motion-estimation based video compression techniques, and cause an increase of the required bandwidth of the compressed signal. The compression rate reduction results from the frequent large amount of random image local movements which differ from one image to the other, resulting from the turbulence effects. In this research we examined the increase of compression rate by developing and comparing two approaches. In the first approach, a pre-processing image restoration is first performed, which includes reduction of the random movements in the video signal and optionally de-blurring the image. Then, a standard compression process is carried out. In this case, the final de-compressed video signal is a restored version of the recorded one. The second approach intends to predict turbulence-induced motion vectors according to the latest images in the sequence. In this approach the final decompressed image should be as much the same as the recorded image (including the spatiotemporal movements). It was found that the first approach improves the compression ratio. At the second approach it was found that after running short temporal median on the video sequence the turbulence optical flow progress can be predicted very well, but this result was not enough for producing a significant improvement at this stage.

Original languageEnglish
Title of host publicationMathematics for Signal and Information Processing
EditorsMark S. Schmalz
DOIs
StatePublished - 2 Nov 2009
EventMathematics for Signal and Information Processing - San Diego, CA, United States
Duration: 2 Aug 20095 Aug 2009

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume7444
ISSN (Print)0277-786X

Conference

ConferenceMathematics for Signal and Information Processing
Country/TerritoryUnited States
CitySan Diego, CA
Period2/08/095/08/09

Keywords

  • Atmospheric turbulence
  • Compression
  • Turbulence-affected images
  • Turbulent image compression

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Compression of turbulence-affected video signals'. Together they form a unique fingerprint.

Cite this