Flow visualization is an old tool in fluid dynamics but has been used for a long time mainly for qualitative description, because manual quantitative evaluation has been prohibitively laborious. Digital image sequence analysis allows area-extended velocity data to be extracted automatically. In section 2.2.8 we discussed an example of flow visualization by particle tracking. Some results are shown in plate 4.
Satellite image sequences of the sea surface temperature (see section 1.2.1 and plate 1) can be used to determine near-surface ocean currents [Wahl and Simpson, 1990].
In the industrial environment, motion sensors based on image sequence analysis are beginning to play an important role. Their usage covers a wide spectrum starting with remote velocity measurements in industrial processes [Massen et al., 1987] to the control of autonomous vehicles and robots [Dickmanns, 1987].
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