This function evaluates the THSP (Time History Speckle Patterns) of a set
  points selected in DATA(:,:,1), and through DATA(:,:,k) 
  for all k value. Similarly to [1][2] the THSP is calculated.

  References:
  [1]  OULOMARA, G.; TRIBILLON, J.; DUVERNOY, J. Biological activity measurements 
       on botanical specimen surfaces using a temporal decorrelation effect of 
       laser speckle. Journal of Moderns Optics, London, v. 36, n. 2, p. 136-179, 
       Feb. 1989.

  [2]  XU, Z.; JOENATHAN, C.; KHORANA, B. M. Temporal and spatial properties of 
       the time-varying speckles of botanical specimens. Optical Engineering, Virginia, 
       v. 34, n. 5, p. 1487-1502, May 1995.


  After starting the main routine just type the following command at the
  prompt:
  Y = thsp_points(DATA, POINTS);
  
  Input:
  DATA    is the speckle data pack. Where DATA is a 3D matrix created grouping NTIMES 
          intensity matrices with NLIN lines and NCOL columns. When N=size(DATA), then
          N(1,1) represent NLIN and
          N(1,2) represent NCOL and
          N(1,3) represent NTIMES.
  POINTS  is a matrix with two columns and M lines,
          where each line represent one point in study as (line,column).
          Or a column vector with M lines,
          where each line represent one point in study as a linear index.
          A matrix is linearly indexed moving from one column to next, 
          filling up all rows in each column.

  Output:
  Y      is the time history speckle patterns. Where Y is a 2D matrix with
         M lines and NTIMES columns.

Package: bsltl