import os
from loguru import logger
from PIL import ImageFilter
from pydantic import NonNegativeFloat
from data_juicer.utils.constant import Fields
from data_juicer.utils.file_utils import transfer_filename
from data_juicer.utils.lazy_loader import LazyLoader
from data_juicer.utils.mm_utils import detect_faces, load_data_with_context, load_image
from data_juicer.utils.model_utils import get_model, prepare_model
from ..base_op import OPERATORS, UNFORKABLE, Mapper
from ..op_fusion import LOADED_IMAGES
cv2 = LazyLoader("cv2", "opencv-python")
OP_NAME = "image_face_blur_mapper"
[docs]
@UNFORKABLE.register_module(OP_NAME)
@OPERATORS.register_module(OP_NAME)
@LOADED_IMAGES.register_module(OP_NAME)
class ImageFaceBlurMapper(Mapper):
"""Mapper to blur faces detected in images."""
_default_kwargs = {
"scaleFactor": 1.1,
"minNeighbors": 3,
"minSize": None,
"maxSize": None,
}
[docs]
def __init__(
self, cv_classifier: str = "", blur_type: str = "gaussian", radius: NonNegativeFloat = 2, *args, **kwargs
):
"""
Initialization method.
:param cv_classifier: OpenCV classifier path for face detection.
By default, we will use 'haarcascade_frontalface_alt.xml'.
:param blur_type: Type of blur kernel, including
['mean', 'box', 'gaussian'].
:param radius: Radius of blur kernel.
:param args: extra args
:param kwargs: extra args
"""
super().__init__(*args, **kwargs)
self._init_parameters = self.remove_extra_parameters(locals())
if cv_classifier == "":
cv_classifier = os.path.join(cv2.data.haarcascades, "haarcascade_frontalface_alt.xml")
if blur_type not in ["mean", "box", "gaussian"]:
raise ValueError(
f"Blur_type [{blur_type}] is not supported. " f'Can only be one of ["mean", "box", "gaussian"]. '
)
if radius < 0:
raise ValueError("Radius must be >= 0. ")
if blur_type == "mean":
self.blur = ImageFilter.BLUR
elif blur_type == "box":
self.blur = ImageFilter.BoxBlur(radius)
else:
self.blur = ImageFilter.GaussianBlur(radius)
self.blur_type = blur_type
self.radius = radius
self.extra_kwargs = self._default_kwargs
for key in kwargs:
if key in self.extra_kwargs:
self.extra_kwargs[key] = kwargs[key]
self.model_key = prepare_model(model_type="opencv_classifier", model_path=cv_classifier)
[docs]
def process_single(self, sample, context=False):
# there is no image in this sample
if self.image_key not in sample or not sample[self.image_key]:
sample[Fields.source_file] = []
return sample
if Fields.source_file not in sample or not sample[Fields.source_file]:
sample[Fields.source_file] = sample[self.image_key]
# load images
loaded_image_keys = sample[self.image_key]
sample, images = load_data_with_context(sample, context, loaded_image_keys, load_image)
model = get_model(self.model_key)
# detect faces
face_detections = {}
for key, image in images.items():
face_detections[key] = detect_faces(image, model, **self.extra_kwargs)
logger.debug(f"detections: {face_detections}")
# blur face regions
key_mapping = {}
for key, image in images.items():
dets = face_detections[key]
# only blur when detected face
if len(dets) > 0:
blured_image = image.copy()
for x, y, w, h in dets:
box = (x, y, x + w, y + h)
blured_roi = image.crop(box).filter(self.blur)
blured_image.paste(blured_roi, box)
blured_image_key = transfer_filename(key, OP_NAME, **self._init_parameters)
blured_image.save(blured_image_key)
key_mapping[key] = blured_image_key
if context:
sample[Fields.context][blured_image_key] = blured_image
else:
key_mapping[key] = key
# when the file is modified, its source file needs to be updated.
for i, value in enumerate(loaded_image_keys):
if sample[Fields.source_file][i] != value:
if key_mapping[value] != value:
sample[Fields.source_file][i] = value
sample[self.image_key] = [key_mapping[key] for key in loaded_image_keys]
return sample