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checkimage.py
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checkimage.py
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from __future__ import print_function
"""
This script compares the png test image given in the second argument against
the known good baseline given in the third. Alternate known good images
(with _number.png in the filename) are also compared against.
"""
import math
import numpy
import vtk
import os
import os.path
import sys
import logging
import shutil
defaultThreshold=10.0
def image_compare(testImage, baselineImage):
imageDiff = vtk.vtkImageDifference()
imageDiff.SetInputData(testImage)
imageDiff.SetImageData(baselineImage)
imageDiff.Update()
return (imageDiff.GetThresholdedError(), imageDiff.GetOutput())
def dump_image_to_file(fname,img):
wr = vtk.vtkPNGWriter()
wr.SetFileName(fname)
wr.SetInputData(img)
wr.Write()
def image_from_file(fname):
try:
rd = vtk.vtkPNGReader()
rd.SetFileName(fname)
removeAlpha = vtk.vtkImageExtractComponents()
removeAlpha.SetComponents(0, 1, 2)
removeAlpha.SetInputConnection(rd.GetOutputPort())
removeAlpha.Update()
return removeAlpha.GetOutput();
except Exception as err:
print("Problem opening file '%s': %s"%(fname,err))
return None
def find_alternates(fname):
dirname = os.path.dirname(fname)
prefix, ext = os.path.splitext(os.path.split(fname)[1])
files = os.listdir(dirname)
results = [fname]
for i in files:
if i.startswith(prefix) and i.endswith(ext) and i != prefix+ext:
results.append(os.path.join(dirname, i))
return results
def check_result_image(fname, baselinefname, threshold = defaultThreshold,
baseline = True, cleanup=True, update_baseline=False):
testImage = image_from_file(fname)
if testImage is None:
print("Testing image missing, test failed.")
return -1
if baseline:
baselinefnames = find_alternates(baselinefname)
else:
baselinefnames = [baselinefname,]
print("Found Baselines:")
for baselinefname in baselinefnames:
print("- %s"%baselinefname)
bestImage = None
bestFilename = None
bestDiff = None
bestDiffImage = None
for baselineFilename in baselinefnames:
sys.stdout.write("Comparing %s %s ... "%(fname, baselineFilename))
baselineImage = image_from_file(baselineFilename)
if baselineImage is None:
continue
diff, diffImage = image_compare(testImage, baselineImage)
sys.stdout.write("diff=%f"%diff)
if bestDiff is None or diff < bestDiff:
sys.stdout.write(", New best!")
bestDiff = diff
bestFilename = baselineFilename
bestImage = baselineImage
bestDiffImage = diffImage
if bestDiff < threshold:
break
sys.stdout.write("\n")
if bestImage is None:
print("No baseline images found. Test failed.")
return -1
if update_baseline is True:
print("UPDATE MODE updating %s with %s" % (bestFilename,fname))
shutil.copy(fname,bestFilename)
return 0
if bestDiff < threshold:
print("Baseline '%s' is the best match with a difference of %f."%(bestFilename, bestDiff))
if cleanup:
print("Deleting test image '%s'..."%(fname))
os.remove(fname)
return 0
print("All baselines failed! Lowest error (%f) exceeds threshold (%f)."%(bestDiff, threshold))
sp = fname.split(".")
diffFilename = ".".join(sp[:-1])+"_diff."+sp[-1]
print("Saving image diff at %s"%diffFilename)
dump_image_to_file(diffFilename, bestDiffImage)
# Print metadata for CDash image upload:
def printDart(name, type, value, suff=""):
print('<DartMeasurement%s name="%s" type="%s">%s</DartMeasurement%s>'%(
suff, name, type, value, suff))
printDart("ImageError", "numeric/double", "%f"%bestDiff)
printDart("TestImage", "image/png", os.path.abspath(fname), "File")
printDart("DifferenceImage", "image/png", os.path.abspath(diffFilename), "File")
printDart("ValidImage", "image/png", os.path.abspath(bestFilename), "File")
return -1
def main():
if len(sys.argv) != 4:
print("Error:")
print("Called with: " + str(sys.argv))
print("Call with " + sys.argv[0] + " test_directory/test_filename.png baseline_directory/baseline_filename.png threshold")
sys.exit(-1)
ret = check_result_image(sys.argv[1], sys.argv[2], float(sys.argv[3]))
sys.exit(ret)
if __name__ == "__main__":
main()