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Differential Time Lapse Video for Real Time Application
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Time lapse technique is photography technique where by each film frame is captured at a much slower rate than it will replay back. When replayed at normal rate, time appears to be moving faster and thus time lapsing. Time lapse technique is a very powerful technique to document slowly changing/developing/moving phenomenon. Time lapse technique can be classified as periodic and non periodic time lapse video. For natural movements like sunrise, blooming of flowers the periodic time lapse technique is used, while for uncertain activities like human activity, bird flying, animal movement non periodic time lapse technique is used. One of the classifications of non periodic time lapse video is differential time lapse video. As its name suggest in this technique the frames are selected on the basis of amount of difference in between them. To find out the difference in between the successive frames mainly one of the three algorithms can be used, these algorithms are Pixel to pixel bit mapping, Edge detection and Motion detection. The quality of differential time lapse video depends on the algorithm which is used for the frame selection criterion.
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