1) The BVH file format was originally developed by Biovision, a
mobile hosting services company, as a way to provide capture
information to their customers. The term BVH stands for Biovision
sequence data. This format mainly replaces the previous format they
developed, the BVA format discussed in the next section, as a way
to provide bone detail with the addition of motion data. The BVH
format is an excellent all-encompassing format, whose only problem
is the lack of a complete description of the base of the pose (this
format has only descriptive descriptions of children's parts from
their parent, no rotating offset description), and has no explicit
details on how to draw parts but that doesn't affect in the
description of the proposal.
2) There are a total of two methods through which we can use
it's data to compare the similarity between two body poses:
- Comparison Of
Frames: Here, the presentations of all local frames
pertain to the parental framework. It is called a related
representation or a related rotation matrix. Private related
presentations have more benefits than complete presentations. The
integration of the related rotation matrix from BVH data is simpler
than that of fully rotated calculations. In addition, the related
representation is best suited to compare the position. The image
that all members are attached to the frame around the joint.
Therefore, the similarity of the position of the two parallel
segments can be determined by comparing the position of the two
frames. By combining the origin of the two collar columns, the
three angles included (∆θx, ∆θy, ∆θz) can be calculated from the
six vectors directing the axes (x1, x2, y1, y2, z 1, z2).
The three angles included in the points between - 1 and 1 are the
following equation:
The part represents the points of the category, and
the main points mean the similarity of the abetter. The chances of
getting a negative side are slim due to the limitations of the
human body.
- Plummet Method
for Root-Frame Comparison: In contrast to the
frames of other joints, the root frame is defined in relation to
the global framework. Brightness will occur when two people are
working in the same way but are facing different directions. Using
the BVH format, the direction of the plumb line is proportional to
the Y-axis of the global framework. Six angles between the axes of
the two root frames and the plumb line are calculated. This is
followed by a calculation of
:
Similarity points for root frames that can be obtained by adding
∆θx, ∆θy, and ∆θz. If the points are large, the difference between
the two root systems is small.