Parses VATIC files.
matz, Dec 2013.
As per https://raw.github.com/cvondrick/vatic/master/README:
The parser expects a txt file in wich each line contains one
annotation. Each line contains 10+ columns, separated by spaces. The
definition of these columns are:
1 Track ID. All rows with the same ID belong to the same path.
2 xmin. The top left x-coordinate of the bounding box.
3 ymin. The top left y-coordinate of the bounding box.
4 xmax. The bottom right x-coordinate of the bounding box.
5 ymax. The bottom right y-coordinate of the bounding box.
6 frame. The frame that this annotation represents.
7 lost. If 1, the annotation is outside of the view screen.
8 occluded. If 1, the annotation is occluded.
9 generated. If 1, the annotation was automatically interpolated.
10 label. The label for this annotation, enclosed in quotation marks.
11+ attributes. Each column after this is an attribute.
Note: Frame numbers start with '0' as the first frame. This convention
is used by the CVAC code as well.
