NAME

     iwh2 - Wavelet - Uniform Bin Width  Quantization  -  Huffman
     Coding Decompression

SYNOPSIS

     iwh2 [ -Nntap ] [ -Ootap ] [ -V ] [ -? ]

DESCRIPTION

     iwh2 performs wavelet uniform quantization  huffman  coding.
     The  algorithm  uses 2-D wavelet tensor transform algorithm,
     uniform quantization and Huffman coding.
     iwh2 gets both its data and its parameters from command line
     arguments.   These  arguments specify the input, output, the
     compression ratio, the trace wavelet transform decomposition
     levels,  the time wavelet transform decomposition levels and
     verbose printout, if desired.

  Command line arguments
     -N ntap
          Enter the input data set name or file immediately after
          typing -N unless the input is from a pipe in which case
          the -N entry must be omitted.  This input  file  should
          include the complete path name if the file resides in a
          different directory.  Example -N/b/vsp/dummy tells  the
          program to look for file 'dummy' in directory '/b/vsp'.

     -O otap
          Enter the output data  set  name  or  file  immediately
          after typing -O.  This output file is not required when
          piping the output to another process.  The output  data
          set also requires the full path name (see above).

     -V   Enter the command line argument '-V' to get  additional
          printout.

     -? or -h
          Enter the command line argument '-?'  or   -h   to  get
          online  help.   The  program  terminates after the help
          screen is printed.

DISCUSSION

     This code uses a  Wavelet-Uniform  Bin  Width  Quantization-
     Huffman  Coding  decompression  algorithm. The input file is
     structured so as to contain the  seismic  header  losslessly
     compressed  by  gzip,  followed  by  a compression parameter
     header (such as wavelet filters, quantization bin widths and
     Huffman codes), followed by the Huffman coded, uniform quan-
     tized wavelet tensor transform coefficients.

     This  product  is  licensed  from  GeoEnergy  Inc.   It   is
     proprietary  to  BP  Amoco and may not be ported to applica-
     tions or locations outside the company without the expressed
     written permission

BUGS

     None known up to this point

SEE ALSO

     wh2(1)

AUTHOR

     Anthony Vassiliou (GeoEnergy Inc.  918-494-4641),  Joe  Wade
     (socon 421-3324)

COPYRIGHT

     copyright 2001, Amoco Production Company
               All Rights Reserved
          an affiliate of BP America Inc.