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In: Computer Science

Question 2. (1 point) Biovision BVH is a very popular file format for storing human body...

Question 2. (1 point) Biovision BVH is a very popular file format for storing human body motion data. Learn this file format by yourself from online resources, then 1) describe it in a short paragraph. 2) How can you use its data to compare the similarity between two body poses?

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Expert Solution

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.

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