when I read the paper "Structure-from-Motion Revisited". I met a few words I didn't understand， "track" and "track length". what exactly these terms mean?
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A track is a sequence of image positions of a feature (usually an image point) in subsequent images. For example, the track of an eye in a video showing a person is the sequences of pixel positions of that eye in the video stream
Track length is the number of frames that feature is successfully tracked for - say, from the frame the feature is detected to the one it is lost, e.g. due to occlusion, blurring, going out of the field of view or very far away, etc.
Francesco Callari
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