def get_suggested_focal_point(self):
with self.get_willow_image() as willow:
faces = willow.detect_faces()
if faces:
# Create a bounding box around all faces
left = min(face[0] for face in faces)
top = min(face[1] for face in faces)
right = max(face[2] for face in faces)
bottom = max(face[3] for face in faces)
focal_point = Rect(left, top, right, bottom)
else:
features = willow.detect_features()
if features:
# Create a bounding box around all features
left = min(feature[0] for feature in features)
top = min(feature[1] for feature in features)
right = max(feature[0] for feature in features)
bottom = max(feature[1] for feature in features)
focal_point = Rect(left, top, right, bottom)
else:
return None
# Add 20% to width and height and give it a minimum size
x, y = focal_point.centroid
width, height = focal_point.size
width *= 1.20
height *= 1.20
width = max(width, 100)
height = max(height, 100)
return Rect.from_point(x, y, width, height)
def get_suggested_focal_point(self, backend_name='default'):
backend = get_image_backend(backend_name)
image_file = self.file.file
# Make sure image is open and seeked to the beginning
image_file.open('rb')
image_file.seek(0)
# Load the image
image = backend.open_image(self.file.file)
image_data = backend.image_data_as_rgb(image)
# Make sure we have image data
# If the image is animated, image_data_as_rgb will return None
if image_data is None:
return
# Use feature detection to find a focal point
feature_detector = FeatureDetector(image.size, image_data[0],
image_data[1])
faces = feature_detector.detect_faces()
if faces:
# Create a bounding box around all faces
left = min(face.left for face in faces)
top = min(face.top for face in faces)
right = max(face.right for face in faces)
bottom = max(face.bottom for face in faces)
focal_point = Rect(left, top, right, bottom)
else:
features = feature_detector.detect_features()
if features:
# Create a bounding box around all features
left = min(feature[0] for feature in features)
top = min(feature[1] for feature in features)
right = max(feature[0] for feature in features)
bottom = max(feature[1] for feature in features)
focal_point = Rect(left, top, right, bottom)
else:
return None
# Add 20% to width and height and give it a minimum size
x, y = focal_point.centroid
width, height = focal_point.size
width *= 1.20
height *= 1.20
width = max(width, 100)
height = max(height, 100)
return Rect.from_point(x, y, width, height)
def test_getitem(self):
rect = Rect(100, 150, 200, 250)
self.assertEqual(rect[0], 100)
self.assertEqual(rect[1], 150)
self.assertEqual(rect[2], 200)
self.assertEqual(rect[3], 250)
self.assertRaises(IndexError, rect.__getitem__, 4)
def get_suggested_focal_point(self):
with self.get_willow_image() as willow:
faces = willow.detect_faces()
if faces:
# Create a bounding box around all faces
left = min(face[0] for face in faces)
top = min(face[1] for face in faces)
right = max(face[2] for face in faces)
bottom = max(face[3] for face in faces)
focal_point = Rect(left, top, right, bottom)
else:
features = willow.detect_features()
if features:
# Create a bounding box around all features
left = min(feature[0] for feature in features)
top = min(feature[1] for feature in features)
right = max(feature[0] for feature in features)
bottom = max(feature[1] for feature in features)
focal_point = Rect(left, top, right, bottom)
else:
return None
# Add 20% to width and height and give it a minimum size
x, y = focal_point.centroid
width, height = focal_point.size
width *= 1.20
height *= 1.20
width = max(width, 100)
height = max(height, 100)
return Rect.from_point(x, y, width, height)
def test_centroid(self):
rect = Rect(100, 150, 200, 350)
self.assertIsInstance(rect.centroid, Vector)
self.assertEqual(rect.centroid, (150, 250))
self.assertEqual(rect.x, 150)
self.assertEqual(rect.y, 250)
self.assertEqual(rect.centroid_x, 150)
self.assertEqual(rect.centroid_y, 250)
def get_focal_point(self):
if (
self.focal_point_x is not None
and self.focal_point_y is not None
and self.focal_point_width is not None
and self.focal_point_height is not None
):
return Rect.from_point(
self.focal_point_x, self.focal_point_y, self.focal_point_width, self.focal_point_height
)
def get_focal_point(self):
if self.focal_point_x is not None and \
self.focal_point_y is not None and \
self.focal_point_width is not None and \
self.focal_point_height is not None:
return Rect.from_point(
self.focal_point_x,
self.focal_point_y,
self.focal_point_width,
self.focal_point_height,
)
def test_fill_filter_with_focal_point(self):
image = Image.objects.create(
title="Test image",
file=get_test_image_file(filename='test_rf3.png'),
)
image.set_focal_point(Rect(100, 100, 200, 200))
image.save()
rendition = image.get_rendition('fill-100x100')
self.assertEqual(rendition.file.name, 'images/test_rf3.15ee4958.fill-100x100.png')
def test_filter_with_pipe_gets_dotted(self):
image = Image.objects.create(
title="Test image",
file=get_test_image_file(filename='test_rf4.png'),
)
image.set_focal_point(Rect(100, 100, 200, 200))
image.save()
rendition = image.get_rendition('fill-200x200|height-150')
self.assertEqual(rendition.file.name, 'images/test_rf4.15ee4958.fill-200x200.height-150.png')
def test_get_focal_point(self):
self.assertEqual(self.image.get_focal_point(), None)
# Add a focal point to the image
self.image.focal_point_x = 100
self.image.focal_point_y = 200
self.image.focal_point_width = 50
self.image.focal_point_height = 20
# Get it
self.assertEqual(self.image.get_focal_point(), Rect(75, 190, 125, 210))
def get_suggested_focal_point(self, backend_name='default'):
backend = get_image_backend(backend_name)
image_file = self.file.file
# Make sure image is open and seeked to the beginning
image_file.open('rb')
image_file.seek(0)
# Load the image
image = backend.open_image(self.file.file)
image_data = backend.image_data_as_rgb(image)
# Make sure we have image data
# If the image is animated, image_data_as_rgb will return None
if image_data is None:
return
# Use feature detection to find a focal point
feature_detector = FeatureDetector(image.size, image_data[0], image_data[1])
faces = feature_detector.detect_faces()
if faces:
# Create a bounding box around all faces
left = min(face.left for face in faces)
top = min(face.top for face in faces)
right = max(face.right for face in faces)
bottom = max(face.bottom for face in faces)
focal_point = Rect(left, top, right, bottom)
else:
features = feature_detector.detect_features()
if features:
# Create a bounding box around all features
left = min(feature[0] for feature in features)
top = min(feature[1] for feature in features)
right = max(feature[0] for feature in features)
bottom = max(feature[1] for feature in features)
focal_point = Rect(left, top, right, bottom)
else:
return None
# Add 20% to width and height and give it a minimum size
x, y = focal_point.centroid
width, height = focal_point.size
width *= 1.20
height *= 1.20
width = max(width, 100)
height = max(height, 100)
return Rect.from_point(x, y, width, height)
def test_set_focal_point(self):
self.assertEqual(self.image.focal_point_x, None)
self.assertEqual(self.image.focal_point_y, None)
self.assertEqual(self.image.focal_point_width, None)
self.assertEqual(self.image.focal_point_height, None)
self.image.set_focal_point(Rect(100, 150, 200, 350))
self.assertEqual(self.image.focal_point_x, 150)
self.assertEqual(self.image.focal_point_y, 250)
self.assertEqual(self.image.focal_point_width, 100)
self.assertEqual(self.image.focal_point_height, 200)
self.image.set_focal_point(None)
self.assertEqual(self.image.focal_point_x, None)
self.assertEqual(self.image.focal_point_y, None)
self.assertEqual(self.image.focal_point_width, None)
self.assertEqual(self.image.focal_point_height, None)
def detect_faces(self):
if opencv_available:
cascade_filename = os.path.join(os.path.dirname(__file__), 'face_detection', 'haarcascade_frontalface_alt2.xml')
cascade = cv.Load(cascade_filename)
image = self.opencv_grey_image()
cv.EqualizeHist(image, image)
min_size = (40, 40)
haar_scale = 1.1
min_neighbors = 3
haar_flags = 0
faces = cv.HaarDetectObjects(
image, cascade, cv.CreateMemStorage(0),
haar_scale, min_neighbors, haar_flags, min_size
)
if faces:
return [Rect(face[0][0], face[0][1], face[0][0] + face[0][2], face[0][1] + face[0][3]) for face in faces]
return []
def test_set_centroid_with_vector(self):
rect = Rect(100, 150, 200, 350)
rect.centroid = Vector(500, 500)
self.assertEqual(rect, (450, 400, 550, 600))
def test_as_tuple(self):
rect = Rect(100, 150, 200, 250)
self.assertEqual(rect.as_tuple(), (100, 150, 200, 250))
def test_set_size_with_vector(self):
rect = Rect(100, 150, 200, 350)
rect.size = Vector(200, 400)
self.assertEqual(rect, (50, 50, 250, 450))
def test_repr(self):
rect = Rect(100, 150, 200, 250)
self.assertEqual(repr(rect),
"Rect(left: 100, top: 150, right: 200, bottom: 250)")
def test_from_point(self):
rect = Rect.from_point(100, 200, 50, 20)
self.assertEqual(rect, Rect(75, 190, 125, 210))
def test_get_key(self):
rect = Rect(100, 150, 200, 250)
self.assertEqual(rect.get_key(), '150-200-100x100')
def test_set_centroid_with_vector(self):
rect = Rect(100, 150, 200, 350)
rect.centroid = Vector(500, 500)
self.assertEqual(rect, (450, 400, 550, 600))
def test_size(self):
rect = Rect(100, 150, 200, 350)
self.assertIsInstance(rect.size, Vector)
self.assertEqual(rect.size, (100, 200))
self.assertEqual(rect.width, 100)
self.assertEqual(rect.height, 200)
def test_set_size_with_vector(self):
rect = Rect(100, 150, 200, 350)
rect.size = Vector(200, 400)
self.assertEqual(rect, (50, 50, 250, 450))
def test_centroid(self):
rect = Rect(100, 150, 200, 350)
self.assertEqual(rect.centroid, (150, 250))
self.assertEqual(rect.centroid_x, 150)
self.assertEqual(rect.centroid_y, 250)
def run(self, willow, image):
image_width, image_height = willow.get_size()
focal_point = image.get_focal_point()
# Get crop aspect ratio
crop_aspect_ratio = self.width / self.height
# Get crop max
crop_max_scale = min(image_width, image_height * crop_aspect_ratio)
crop_max_width = crop_max_scale
crop_max_height = crop_max_scale / crop_aspect_ratio
# Initialise crop width and height to max
crop_width = crop_max_width
crop_height = crop_max_height
# Use crop closeness to zoom in
if focal_point is not None:
# Get crop min
crop_min_scale = max(focal_point.width,
focal_point.height * crop_aspect_ratio)
crop_min_width = crop_min_scale
crop_min_height = crop_min_scale / crop_aspect_ratio
# Sometimes, the focal point may be bigger than the image...
if not crop_min_scale >= crop_max_scale:
# Calculate max crop closeness to prevent upscaling
max_crop_closeness = max(
1 - (self.width - crop_min_width) /
(crop_max_width - crop_min_width),
1 - (self.height - crop_min_height) /
(crop_max_height - crop_min_height))
# Apply max crop closeness
crop_closeness = min(self.crop_closeness, max_crop_closeness)
if 1 >= crop_closeness >= 0:
# Get crop width and height
crop_width = crop_max_width + (
crop_min_width - crop_max_width) * crop_closeness
crop_height = crop_max_height + (
crop_min_height - crop_max_height) * crop_closeness
# Find focal point UV
if focal_point is not None:
fp_x, fp_y = focal_point.centroid
else:
# Fall back to positioning in the centre
fp_x = image_width / 2
fp_y = image_height / 2
fp_u = fp_x / image_width
fp_v = fp_y / image_height
# Position crop box based on focal point UV
crop_x = fp_x - (fp_u - 0.5) * crop_width
crop_y = fp_y - (fp_v - 0.5) * crop_height
# Convert crop box into rect
rect = Rect.from_point(crop_x, crop_y, crop_width, crop_height)
# Make sure the entire focal point is in the crop box
if focal_point is not None:
rect = rect.move_to_cover(focal_point)
# Don't allow the crop box to go over the image boundary
rect = rect.move_to_clamp(Rect(0, 0, image_width, image_height))
# Crop!
willow.crop(rect.round())
# Get scale for resizing
# The scale should be the same for both the horizontal and
# vertical axes
aftercrop_width, aftercrop_height = willow.get_size()
scale = self.width / aftercrop_width
# Only resize if the image is too big
if scale < 1.0:
# Resize!
willow.resize((self.width, self.height))
def test_from_point(self):
rect = Rect.from_point(100, 200, 50, 20)
self.assertEqual(rect, Rect(75, 190, 125, 210))
def test_init(self):
rect = Rect(100, 150, 200, 250)
self.assertEqual(rect.left, 100)
self.assertEqual(rect.top, 150)
self.assertEqual(rect.right, 200)
self.assertEqual(rect.bottom, 250)
def test_get_rect(self):
self.assertTrue(self.image.get_rect(), Rect(0, 0, 640, 480))
def get_rect(self):
return Rect(0, 0, self.width, self.height)
def test_as_tuple(self):
rect = Rect(100, 150, 200, 250)
self.assertEqual(rect.as_tuple(), (100, 150, 200, 250))
def test_equality(self):
self.assertEqual(Rect(100, 150, 200, 250), Rect(100, 150, 200, 250))
self.assertNotEqual(Rect(100, 150, 200, 250), Rect(10, 15, 20, 25))
def resize_to_fill(self, image, arg, focal_point=None):
"""
Resize down and crop image to fill the given dimensions. Most suitable for thumbnails.
(The final image will match the requested size, unless one or the other dimension is
already smaller than the target size)
"""
size = arg[:2]
# Get crop closeness if it's set
if len(arg) > 2 and arg[2] is not None:
crop_closeness = arg[2] / 100
# Clamp it
if crop_closeness > 1:
crop_closeness = 1
else:
crop_closeness = 0
# Get image width and height
(im_width, im_height) = image.size
# Get filter width and height
fl_width = size[0]
fl_height = size[1]
# Get crop aspect ratio
crop_aspect_ratio = fl_width / fl_height
# Get crop max
crop_max_scale = min(im_width, im_height * crop_aspect_ratio)
crop_max_width = crop_max_scale
crop_max_height = crop_max_scale / crop_aspect_ratio
# Initialise crop width and height to max
crop_width = crop_max_width
crop_height = crop_max_height
# Use crop closeness to zoom in
if focal_point is not None:
fp_width = focal_point.width
fp_height = focal_point.height
# Get crop min
crop_min_scale = max(fp_width, fp_height * crop_aspect_ratio)
crop_min_width = crop_min_scale
crop_min_height = crop_min_scale / crop_aspect_ratio
# Sometimes, the focal point may be bigger than the image...
if not crop_min_scale >= crop_max_scale:
# Calculate max crop closeness to prevent upscaling
max_crop_closeness = max(
1 - (fl_width - crop_min_width) / (crop_max_width - crop_min_width),
1 - (fl_height - crop_min_height) / (crop_max_height - crop_min_height)
)
# Apply max crop closeness
crop_closeness = min(crop_closeness, max_crop_closeness)
if 1 >= crop_closeness >= 0:
# Get crop width and height
crop_width = crop_max_width + (crop_min_width - crop_max_width) * crop_closeness
crop_height = crop_max_height + (crop_min_height - crop_max_height) * crop_closeness
# Find focal point UV
if focal_point is not None:
fp_x, fp_y = focal_point.centroid
else:
# Fall back to positioning in the centre
fp_x = im_width / 2
fp_y = im_height / 2
fp_u = fp_x / im_width
fp_v = fp_y / im_height
# Position crop box based on focal point UV
crop_x = fp_x - (fp_u - 0.5) * crop_width
crop_y = fp_y - (fp_v - 0.5) * crop_height
# Convert crop box into rect
left = crop_x - crop_width / 2
top = crop_y - crop_height / 2
right = crop_x + crop_width / 2
bottom = crop_y + crop_height / 2
# Make sure the entire focal point is in the crop box
if focal_point is not None:
focal_point_left = focal_point.left
focal_point_top = focal_point.top
focal_point_right = focal_point.right
focal_point_bottom = focal_point.bottom
if left > focal_point_left:
right -= left - focal_point_left
left = focal_point_left
if top > focal_point_top:
bottom -= top - focal_point_top
top = focal_point_top
if right < focal_point_right:
left += focal_point_right - right
right = focal_point_right
if bottom < focal_point_bottom:
top += focal_point_bottom - bottom
bottom = focal_point_bottom
# Don't allow the crop box to go over the image boundary
if left < 0:
right -= left
left = 0
if top < 0:
bottom -= top
top = 0
if right > im_width:
left -= right - im_width
right = im_width
if bottom > im_height:
top -= bottom - im_height
bottom = im_height
# Crop!
return self.resize_to_min(self.crop(image, Rect(left, top, right, bottom)), size)
def run(self, willow, image):
image_width, image_height = willow.get_size()
focal_point = image.get_focal_point()
# Get crop aspect ratio
crop_aspect_ratio = self.width / self.height
# Get crop max
crop_max_scale = min(image_width, image_height * crop_aspect_ratio)
crop_max_width = crop_max_scale
crop_max_height = crop_max_scale / crop_aspect_ratio
# Initialise crop width and height to max
crop_width = crop_max_width
crop_height = crop_max_height
# Use crop closeness to zoom in
if focal_point is not None:
# Get crop min
crop_min_scale = max(focal_point.width, focal_point.height * crop_aspect_ratio)
crop_min_width = crop_min_scale
crop_min_height = crop_min_scale / crop_aspect_ratio
# Sometimes, the focal point may be bigger than the image...
if not crop_min_scale >= crop_max_scale:
# Calculate max crop closeness to prevent upscaling
max_crop_closeness = max(
1 - (self.width - crop_min_width) / (crop_max_width - crop_min_width),
1 - (self.height - crop_min_height) / (crop_max_height - crop_min_height)
)
# Apply max crop closeness
crop_closeness = min(self.crop_closeness, max_crop_closeness)
if 1 >= crop_closeness >= 0:
# Get crop width and height
crop_width = crop_max_width + (crop_min_width - crop_max_width) * crop_closeness
crop_height = crop_max_height + (crop_min_height - crop_max_height) * crop_closeness
# Find focal point UV
if focal_point is not None:
fp_x, fp_y = focal_point.centroid
else:
# Fall back to positioning in the centre
fp_x = image_width / 2
fp_y = image_height / 2
fp_u = fp_x / image_width
fp_v = fp_y / image_height
# Position crop box based on focal point UV
crop_x = fp_x - (fp_u - 0.5) * crop_width
crop_y = fp_y - (fp_v - 0.5) * crop_height
# Convert crop box into rect
rect = Rect.from_point(crop_x, crop_y, crop_width, crop_height)
# Make sure the entire focal point is in the crop box
if focal_point is not None:
rect = rect.move_to_cover(focal_point)
# Don't allow the crop box to go over the image boundary
rect = rect.move_to_clamp(Rect(0, 0, image_width, image_height))
# Crop!
willow = willow.crop(rect.round())
# Get scale for resizing
# The scale should be the same for both the horizontal and
# vertical axes
aftercrop_width, aftercrop_height = willow.get_size()
scale = self.width / aftercrop_width
# Only resize if the image is too big
if scale < 1.0:
# Resize!
willow = willow.resize((self.width, self.height))
return willow
def test_get_key(self):
rect = Rect(100, 150, 200, 250)
self.assertEqual(rect.get_key(), "150-200-100x100")
