def calculate_difference(preview, original_image_id):
"""Calculate difference between two images.
@param preview: preview dict
@param original_image_id: original image ID
@return: difference, difference percentage
"""
try:
i1 = utils.str2image(db.get_file(original_image_id).read())
except IOError as e:
logger.warning("Comparer error reading image: {0}".format(e))
return
# Check if thumb was resized.
if "original_file" in preview:
i2 = utils.str2image(db.get_file(preview["original_file"]).read())
else:
i2 = utils.str2image(db.get_file(preview["file"]).read())
# Resize.
width, height = i2.size
try:
i1 = i1.resize([width, height], Image.ANTIALIAS)
except IOError as e:
logger.warning("Comparer error reading image: {0}".format(e))
return
# Checks.
#assert i1.mode == i2.mode, "Different kinds of images."
#assert i1.size == i2.size, "Different sizes."
# Calculate difference.
pairs = izip(i1.getdata(), i2.getdata())
if len(i1.getbands()) == 1:
# for gray-scale jpegs
dif = sum(abs(p1 - p2) for p1, p2 in pairs)
else:
dif = sum(
abs(c1 - c2) for p1, p2 in pairs for c1, c2 in zip(p1, p2))
ncomponents = i1.size[0] * i1.size[1] * 3
# Get diff percentage.
diff_perc = int((dif / 255.0 * 100) / ncomponents)
# Binary option.
if diff_perc >= 15:
diff = True
else:
diff = False
return diff, diff_perc
def calculate_difference(preview, original_image_id):
"""Calculate difference between two images.
@param preview: preview dict
@param original_image_id: original image ID
@return: difference, difference percentage
"""
try:
i1 = utils.str2image(db.get_file(original_image_id).read())
except IOError as e:
logger.warning("Comparer error reading image: {0}".format(e))
return
# Check if thumb was resized.
if "original_file" in preview:
i2 = utils.str2image(db.get_file(preview["original_file"]).read())
else:
i2 = utils.str2image(db.get_file(preview["file"]).read())
# Resize.
width, height = i2.size
try:
i1 = i1.resize([width, height], Image.ANTIALIAS)
except IOError as e:
logger.warning("Comparer error reading image: {0}".format(e))
return
# Checks.
#assert i1.mode == i2.mode, "Different kinds of images."
#assert i1.size == i2.size, "Different sizes."
# Calculate difference.
pairs = izip(i1.getdata(), i2.getdata())
if len(i1.getbands()) == 1:
# for gray-scale jpegs
dif = sum(abs(p1-p2) for p1,p2 in pairs)
else:
dif = sum(abs(c1-c2) for p1,p2 in pairs for c1,c2 in zip(p1,p2))
ncomponents = i1.size[0] * i1.size[1] * 3
# Get diff percentage.
diff_perc = int((dif / 255.0 * 100) / ncomponents)
# Binary option.
if diff_perc >= 15:
diff = True
else:
diff = False
return diff, diff_perc
def __init__(self, mongo_id, file_name=None):
# Results storage.
self.results = utils.AutoVivification()
# Store image id.
if mongo_id:
self.orig_id = mongo_id
else:
raise Exception("You have to pass the original image ID")
if file_name:
self.file_name = file_name
else:
self.file_name = None
# Read image data.
try:
self.file_data = db.get_file(self.orig_id).read()
except gridfs.errors.NoFile:
raise Exception("Image not found on GridFS storage")
# Save a temporary file, used for analysis which needs a file on disk.
temp_image = tempfile.NamedTemporaryFile(delete=False)
temp_image.write(self.file_data)
temp_image.close() # File is not immediately deleted because we used delete=False
self.temp_image = temp_image.name
def __init__(self, mongo_id, file_name=None):
# Results storage.
self.results = utils.AutoVivification()
# Store image id.
if mongo_id:
self.orig_id = mongo_id
else:
raise Exception("You have to pass the original image ID")
if file_name:
self.file_name = file_name
else:
self.file_name = None
# Read image data.
try:
self.file_data = db.get_file(self.orig_id).read()
except gridfs.errors.NoFile:
raise Exception("Image not found on GridFS storage")
# Save a temporary file, used for analysis which needs a file on disk.
temp_image = tempfile.NamedTemporaryFile(delete=False)
temp_image.write(self.file_data)
temp_image.close(
) # File is not immediately deleted because we used delete=False
self.temp_image = temp_image.name
def image(request, id):
try:
file = get_file(id)
except (InvalidId, TypeError):
return render_to_response("error.html",
{"error": "Unable to load image."},
context_instance=RequestContext(request))
data = file.read()
response = HttpResponse(data, content_type=file.content_type)
response["Content-Disposition"] = "attachment; filename=%s" % id
response["Content-Length"] = len(data)
return response
def image(request, id):
try:
file = get_file(id)
except (InvalidId, TypeError):
return render_to_response("error.html",
{"error": "Unable to load image."},
context_instance=RequestContext(request))
data = file.read()
response = HttpResponse(data, content_type=file.content_type)
response["Content-Disposition"] = "attachment; filename=%s" % id
response["Content-Length"] = len(data)
return response
