25. The non-transitory computer-readable storage medium of claim 23 , wherein detecting an initial image of an object in a particular initial frame comprises: selecting a plurality of bounding boxes from the initial frame; and selecting an image contained in a particular bounding box of the plurality of bounding boxes as an initial image of the object.
26. The non-transitory computer-readable storage medium of claim 25 , wherein selecting the image contained in the particular bounding box of the plurality of bounding boxes as an initial image of the object comprises: applying an object detector to each of the plurality of bounding boxes to generate a respective detection score for each of the bounding boxes; and selecting a highest-scoring bounding box of the plurality of bounding boxes as containing an initial image of the object.