--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/imagej2_bunwarpj_compare_elastic.py	Tue Sep 17 17:05:38 2019 -0400
@@ -0,0 +1,65 @@
+#!/usr/bin/env python
+import argparse
+import subprocess
+import tempfile
+import imagej2_base_utils
+
+# Parse Command Line.
+parser = argparse.ArgumentParser()
+parser.add_argument( '--source_image', dest='source_image', help='Source image' )
+parser.add_argument( '--source_image_format', dest='source_image_format', help='Source image format' )
+parser.add_argument( '--target_image', dest='target_image', help='Target image' )
+parser.add_argument( '--target_image_format', dest='target_image_format', help='Target image format' )
+parser.add_argument( '--source_transformation', dest='source_transformation', help='Direct source transformation matrix' )
+parser.add_argument( '--target_transformation', dest='target_transformation', help='Inverse target transformation matrix' )
+parser.add_argument( '--output', dest='output', help='Warping index' )
+
+args = parser.parse_args()
+
+tmp_dir = imagej2_base_utils.get_temp_dir()
+source_image_path = imagej2_base_utils.get_input_image_path( tmp_dir, args.source_image, args.source_image_format )
+target_image_path = imagej2_base_utils.get_input_image_path( tmp_dir, args.target_image, args.target_image_format )
+source_transformation_path = imagej2_base_utils.get_input_image_path( tmp_dir, args.source_transformation, 'txt' )
+target_transformation_path = imagej2_base_utils.get_input_image_path( tmp_dir, args.target_transformation, 'txt' )
+# bUnwarpJ produces several lines of output that we need to discard, so
+# we'll use a temporary output file from which we'll read only the last line.
+tmp_output_path = imagej2_base_utils.get_input_image_path( tmp_dir, args.output, 'txt' )
+
+# Define command response buffers.
+tmp_out = tempfile.NamedTemporaryFile().name
+tmp_stdout = open( tmp_out, 'wb' )
+tmp_err = tempfile.NamedTemporaryFile().name
+tmp_stderr = open( tmp_err, 'wb' )
+
+# Build the command line to calculate the warping index.
+cmd = imagej2_base_utils.get_base_cmd_bunwarpj( None )
+if cmd is None:
+    imagej2_base_utils.stop_err( "bUnwarpJ not found!" )
+cmd += ' -compare_elastic'
+# Target is sent before source.
+cmd += ' %s' % target_image_path
+cmd += ' %s' % source_image_path
+cmd += ' %s' % target_transformation_path
+cmd += ' %s' % source_transformation_path
+cmd += ' > %s' % tmp_output_path
+
+# Calculate the warping index of two elastic transformations using bUnwarpJ.
+proc = subprocess.Popen( args=cmd, stderr=subprocess.PIPE, stdout=subprocess.PIPE, shell=True )
+rc = proc.wait()
+if rc != 0:
+    error_message = imagej2_base_utils.get_stderr_exception( tmp_err, tmp_stderr, tmp_out, tmp_stdout )
+    imagej2_base_utils.stop_err( error_message )
+
+# Example contents of tmp_output_path:
+# ['Target image : ~/tmpKAYF1P.jpg\n',
+#  'Source image : ~/tmpgQX0dy.gif\n',
+#  'Target Transformation file : ~/tmpZJC_4B.txt\n',
+#  'Source Transformation file : ~/tmphsSojl.txt\n',
+#  ' Warping index = 14.87777347388348\n']
+results = open( tmp_output_path, 'r' ).readlines()
+warp_index = results[ -1 ].split( ' ' )[ -1 ]
+outf = open( args.output, 'wb' )
+outf.write( '%s' % warp_index )
+outf.close()
+
+imagej2_base_utils.cleanup_before_exit( tmp_dir )