18 March 1998 Fragment volume determination in bullet/armor holograms
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This report presents automatic data reduction techniques for determining bullet and fragment volumes, positions, and momenta from holograms of bullets penetrating armor. The holography technique and the computer data reduction methods are described. Initial results are shown and sources of error in the technique are described. 2D digital images of the hologram are computationally combined by running a backprojection algorithm to produce a 3D array that represents the space containing the bullet and fragments. Thresholding the numbers in this space from the backprojection algorithm produces a representation of the bullet and fragments. Methods of automatically counting the voxels (3D picture elements) that occur in separated fragments have been programmed. These programs also find the centroids and shapes of the fragments and determine velocity using timing information. Volume errors are 40% in current results. These errors could be reduced to less than 3% if the described error sources were eliminated. Future work to improve the algorithms and the holographic process is described.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David Lee Smith, David Lee Smith, David B. Watts, David B. Watts, James S. Marsh, James S. Marsh, Joseph E. Gordon, Joseph E. Gordon, Christopher Scott Anderson, Christopher Scott Anderson, } "Fragment volume determination in bullet/armor holograms", Proc. SPIE 3293, Practical Holography XII, (18 March 1998); doi: 10.1117/12.303641; https://doi.org/10.1117/12.303641

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