Date of Award

Fall 1999

Document Type

Thesis

Degree Name

Master of Science in Electrical Engineering - (M.S.)

Department

Electrical and Computer Engineering

First Advisor

Ali N. Akansu

Second Advisor

Yun Q. Shi

Third Advisor

Necdet Uzun

Fourth Advisor

A. Aydin Alatan

Abstract

As MPEG2 becomes the heart of most digital video applications, the need to edit an MPEG2 bitstream video in compressed domain has increased. To realize this need, two major technical issues must be resolved: decoder buffer and segment extraction.

In the decoder buffer issue, the edited stream must ensure that the buffer would not overflow or underfiow as the result of the editing. This thesis invented a mathematical model that could describe the editing task and predict the editing effect on the buffer. Based on this model, the thesis then built a method to edit a stream safely. This method could produce an edited stream that maintained an MIPEG2 decoder's buffer behavior as if the decoder were receiving a non-edited stream.

In the segment extraction issue, the proper method to extract a segment from a source bitstream was discussed. The segment must be independent, that is, no coded picture in the segment would be associated with any other picture data outside of the segment. A proper extraction should also maintain the decoding order and display order of the picture sequence. This thesis visited several past studies on this issue, and proposed a practical method to perform segment extraction.

Simulation results on the discussed methods were also presented.

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