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#!/usr/bin/env python
"""
This file tests vtk.util.vtkImageExportToArray and
vtk.util.vtkImageImportFromArray. It tests the code by first
exporting a PNG image to a Numeric Array and then converts the array
to an image and compares that image to the original image. It does
this for all PNG images in a particular directory.
The test naturally requires Numeric Python to be installed:
http://numpy.sf.net
Run this test like so:
vtkpython TestNumericArrayImageData.py -B $VTK_DATA_ROOT/Baseline/Imaging
"""
# This test requires Numeric.
import sys
try:
import Numeric
except ImportError:
print "This test requires Numeric Python: http://numpy.sf.net"
sys.exit(1)
import os
import glob
import vtk
from vtk.test import Testing
from vtk.util.vtkImageExportToArray import vtkImageExportToArray
from vtk.util.vtkImageImportFromArray import vtkImageImportFromArray
class TestNumericArrayImageData(Testing.vtkTest):
def testImportExport(self):
"Testing if images can be imported to and from numeric arrays."
imp = vtkImageImportFromArray()
exp = vtkImageExportToArray()
idiff = vtk.vtkImageDifference()
img_dir = Testing.getAbsImagePath("")
for i in glob.glob(os.path.join(img_dir, "*.png")):
# Putting the reader outside the loop causes bad problems.
reader = vtk.vtkPNGReader()
reader.SetFileName(i)
reader.Update()
# convert the image to a Numeric Array and convert it back
# to an image data.
exp.SetInputConnection(reader.GetOutputPort())
imp.SetArray(exp.GetArray())
# ensure there is no difference between orig image and the
# one we converted and un-converted.
idiff.SetInputConnection(imp.GetOutputPort())
idiff.SetImage(reader.GetOutput())
idiff.Update()
err = idiff.GetThresholdedError()
msg = "Test failed on image %s, with threshold "\
"error: %d"%(i, err)
self.assertEqual(err, 0.0, msg)
if __name__ == "__main__":
Testing.main([(TestNumericArrayImageData, 'test')])
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