@InProceedings{Leopold2003, author = {Leopold, Klaus and Hellwagner, Hermann and Kropfberger, Michael}, booktitle = {Proc. of SPIE}, title = {QCTVA - Quality Controlled Temporal Video Adaptation}, year = {2003}, address = {NA}, editor = {N,A}, month = sep, pages = {163-174}, publisher = {NA}, abstract = {Multimedia streaming is becoming more and more popular. Seamless video streaming in heterogeneous networks like the Internet turns out as almost impossible due to varying network conditions - streams must be adapted to the current network QoS. Temporal scalability is one of the most reasonable adaptation techniques because it is fast and easy to perform. Today's approaches simply drop frames out of a video without spending much effort on finding an intelligent dropping behavior. This usually leads to good adaptation results in terms of bandwidth consumption but also to suboptimal video quality within the given bounds. Our approach offers analysis of video streams to achieve the qualitatively best temporal scalability. For this reason, we introduce a data structure called modification lattice which represents all frame dropping combinations within a sequence of frames. On the basis of the modification lattice, qualityestimations on frame sequences can be performed. Moreover, a heuristic for fast and efficient quality computation in a modification lattice is presented. Experimental results illustrate that temporal video adaptation based on QCTVA information leads to a better video quality compared to "usual" frame dropping approaches. Furthermore, QCTVA offers frame priority lists for videos. Based on these priorities, numerous adaptation techniques can increase their overall performance when using QCTVA.}, edition = {Vol. 5242}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/QCTVA.pdf}, talktype = {none} }