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JPEG 2000 Quality Scalability in an IP Networking Scenario
Norwegian University of Science and Technology, Faculty of Information Technology, Mathematics and Electrical Engineering, Department of Electronics and Telecommunications.
2012 (English)MasteroppgaveStudent thesis
Abstract [en]

In this thesis, the JPEG 2000 quality scalability feature was investigated in the context of transporting video over IP networks. The goals of the investigation was two-fold. First, it was desired to nd a way of choosing the number of quality layers to embed in a JPEG 2000 codestream. In previous work, this choice has been more or less arbitrary. Second, it was desired to nd how low the video bitrate could be dropped before it became perceptible to a viewer. This information can be used in an IP networking scenario to e.g. adapt the video bitrate blindly according to the measured channel capacity as long as the drop in bitrate is expected to be imperceptible. When the drop in bitrate is expected to be perceptible, a switch could be made to a smoother bitrate adaptation. A way of choosing the total number of quality layers to embed in a codestream was found by minimizing the dierence in predicted quality between direct and scaled compression. Scaled compression is the compression which is achieved by extracting quality layers. The minimization procedure was bound by the speed of the encoder, as it takes longer for an encoder to embed more quality layers. It was found that the procedure was highly dependent on the desired bitrate range. A subjective test was run in order to measure how large a drop in video bitrate had to be for it to become perceptible. A newly developed JPEG 2000 quality layer scaler was used to produce the dierent bitrates in the test. The number of quality layers to embed in codestream was found by using the minimization procedure mentioned above. It was found that, for the bitrate range used in the test, 2 - 30 Mbits/s for a resolution of 1280x720 at 25 frames per second, the magnitude of the drop in bitrate had to be at least 10 Mbits/s before the participants in the test noticed it. A comparison with objective quality metrics, SSIM and PSNR, revealed that it was very dicult to predict the visibility of the drops in bitrate by using these metrics. Designing the type of rate control mentioned in the rst paragraph will therefore have to wait until a parameter with good predictive properties can be found.

Place, publisher, year, edition, pages
Institutt for elektronikk og telekommunikasjon , 2012. , 76 p.
Keyword [no]
ntnudaim:7953, MTEL elektronikk, Multimedia-signalbehandling
URN: urn:nbn:no:ntnu:diva-18465Local ID: ntnudaim:7953OAI: diva2:565957
Available from: 2012-11-08 Created: 2012-11-08

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