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# Copyright 2023 The HuggingFace Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import warnings
from typing import List, Optional, Tuple, Union
import numpy as np
import PIL.Image
import torch
from PIL import Image
from .configuration_utils import ConfigMixin, register_to_config
from .utils import CONFIG_NAME, PIL_INTERPOLATION, deprecate
PipelineImageInput = Union[
PIL.Image.Image,
np.ndarray,
torch.FloatTensor,
List[PIL.Image.Image],
List[np.ndarray],
List[torch.FloatTensor],
]
PipelineDepthInput = Union[
PIL.Image.Image,
np.ndarray,
torch.FloatTensor,
List[PIL.Image.Image],
List[np.ndarray],
List[torch.FloatTensor],
]
class VaeImageProcessor(ConfigMixin):
"""
Image processor for VAE.
Args:
do_resize (`bool`, *optional*, defaults to `True`):
Whether to downscale the image's (height, width) dimensions to multiples of `vae_scale_factor`. Can accept
`height` and `width` arguments from [`image_processor.VaeImageProcessor.preprocess`] method.
vae_scale_factor (`int`, *optional*, defaults to `8`):
VAE scale factor. If `do_resize` is `True`, the image is automatically resized to multiples of this factor.
resample (`str`, *optional*, defaults to `lanczos`):
Resampling filter to use when resizing the image.
do_normalize (`bool`, *optional*, defaults to `True`):
Whether to normalize the image to [-1,1].
do_binarize (`bool`, *optional*, defaults to `False`):
Whether to binarize the image to 0/1.
do_convert_rgb (`bool`, *optional*, defaults to be `False`):
Whether to convert the images to RGB format.
do_convert_grayscale (`bool`, *optional*, defaults to be `False`):
Whether to convert the images to grayscale format.
"""
config_name = CONFIG_NAME
@register_to_config
def __init__(
self,
do_resize: bool = True,
vae_scale_factor: int = 8,
resample: str = "lanczos",
do_normalize: bool = True,
do_binarize: bool = False,
do_convert_rgb: bool = False,
do_convert_grayscale: bool = False,
):
super().__init__()
if do_convert_rgb and do_convert_grayscale:
raise ValueError(
"`do_convert_rgb` and `do_convert_grayscale` can not both be set to `True`,"
" if you intended to convert the image into RGB format, please set `do_convert_grayscale = False`.",
" if you intended to convert the image into grayscale format, please set `do_convert_rgb = False`",
)
self.config.do_convert_rgb = False
@staticmethod
def numpy_to_pil(images: np.ndarray) -> PIL.Image.Image:
"""
Convert a numpy image or a batch of images to a PIL image.
"""
if images.ndim == 3:
images = images[None, ...]
images = (images * 255).round().astype("uint8")
if images.shape[-1] == 1:
# special case for grayscale (single channel) images
pil_images = [Image.fromarray(image.squeeze(), mode="L") for image in images]
else:
pil_images = [Image.fromarray(image) for image in images]
return pil_images
@staticmethod
def pil_to_numpy(images: Union[List[PIL.Image.Image], PIL.Image.Image]) -> np.ndarray:
"""
Convert a PIL image or a list of PIL images to NumPy arrays.
"""
if not isinstance(images, list):
images = [images]
images = [np.array(image).astype(np.float32) / 255.0 for image in images]
images = np.stack(images, axis=0)
return images
@staticmethod
def numpy_to_pt(images: np.ndarray) -> torch.FloatTensor:
"""
Convert a NumPy image to a PyTorch tensor.
"""
if images.ndim == 3:
images = images[..., None]
images = torch.from_numpy(images.transpose(0, 3, 1, 2))
return images
@staticmethod
def pt_to_numpy(images: torch.FloatTensor) -> np.ndarray:
"""
Convert a PyTorch tensor to a NumPy image.
"""
images = images.cpu().permute(0, 2, 3, 1).float().numpy()
return images
@staticmethod
def normalize(images: Union[np.ndarray, torch.Tensor]) -> Union[np.ndarray, torch.Tensor]:
"""
Normalize an image array to [-1,1].
"""
return 2.0 * images - 1.0
@staticmethod
def denormalize(images: Union[np.ndarray, torch.Tensor]) -> Union[np.ndarray, torch.Tensor]:
"""
Denormalize an image array to [0,1].
"""
return (images / 2 + 0.5).clamp(0, 1)
@staticmethod
def convert_to_rgb(image: PIL.Image.Image) -> PIL.Image.Image:
"""
Converts a PIL image to RGB format.
"""
image = image.convert("RGB")
return image
@staticmethod
def convert_to_grayscale(image: PIL.Image.Image) -> PIL.Image.Image:
"""
Converts a PIL image to grayscale format.
"""
image = image.convert("L")
return image
def get_default_height_width(
self,
image: Union[PIL.Image.Image, np.ndarray, torch.Tensor],
height: Optional[int] = None,
width: Optional[int] = None,
) -> Tuple[int, int]:
"""
This function return the height and width that are downscaled to the next integer multiple of
`vae_scale_factor`.
Args:
image(`PIL.Image.Image`, `np.ndarray` or `torch.Tensor`):
The image input, can be a PIL image, numpy array or pytorch tensor. if it is a numpy array, should have
shape `[batch, height, width]` or `[batch, height, width, channel]` if it is a pytorch tensor, should
have shape `[batch, channel, height, width]`.
height (`int`, *optional*, defaults to `None`):
The height in preprocessed image. If `None`, will use the height of `image` input.
width (`int`, *optional*`, defaults to `None`):
The width in preprocessed. If `None`, will use the width of the `image` input.
"""
if height is None:
if isinstance(image, PIL.Image.Image):
height = image.height
elif isinstance(image, torch.Tensor):
height = image.shape[2]
else:
height = image.shape[1]
if width is None:
if isinstance(image, PIL.Image.Image):
width = image.width
elif isinstance(image, torch.Tensor):
width = image.shape[3]
else:
width = image.shape[2]
width, height = (
x - x % self.config.vae_scale_factor for x in (width, height)
) # resize to integer multiple of vae_scale_factor
return height, width
def resize(
self,
image: Union[PIL.Image.Image, np.ndarray, torch.Tensor],
height: Optional[int] = None,
width: Optional[int] = None,
) -> Union[PIL.Image.Image, np.ndarray, torch.Tensor]:
"""
Resize image.
Args:
image (`PIL.Image.Image`, `np.ndarray` or `torch.Tensor`):
The image input, can be a PIL image, numpy array or pytorch tensor.
height (`int`, *optional*, defaults to `None`):
The height to resize to.
width (`int`, *optional*`, defaults to `None`):
The width to resize to.
Returns:
`PIL.Image.Image`, `np.ndarray` or `torch.Tensor`:
The resized image.
"""
if isinstance(image, PIL.Image.Image):
image = image.resize((width, height), resample=PIL_INTERPOLATION[self.config.resample])
elif isinstance(image, torch.Tensor):
image = torch.nn.functional.interpolate(
image,
size=(height, width),
)
elif isinstance(image, np.ndarray):
image = self.numpy_to_pt(image)
image = torch.nn.functional.interpolate(
image,
size=(height, width),
)
image = self.pt_to_numpy(image)
return image
def binarize(self, image: PIL.Image.Image) -> PIL.Image.Image:
"""
Create a mask.
Args:
image (`PIL.Image.Image`):
The image input, should be a PIL image.
Returns:
`PIL.Image.Image`:
The binarized image. Values less than 0.5 are set to 0, values greater than 0.5 are set to 1.
"""
image[image < 0.5] = 0
image[image >= 0.5] = 1
return image
def preprocess(
self,
image: Union[torch.FloatTensor, PIL.Image.Image, np.ndarray],
height: Optional[int] = None,
width: Optional[int] = None,
) -> torch.Tensor:
"""
Preprocess the image input. Accepted formats are PIL images, NumPy arrays or PyTorch tensors.
"""
supported_formats = (PIL.Image.Image, np.ndarray, torch.Tensor)
# Expand the missing dimension for 3-dimensional pytorch tensor or numpy array that represents grayscale image
if self.config.do_convert_grayscale and isinstance(image, (torch.Tensor, np.ndarray)) and image.ndim == 3:
if isinstance(image, torch.Tensor):
# if image is a pytorch tensor could have 2 possible shapes:
# 1. batch x height x width: we should insert the channel dimension at position 1
# 2. channnel x height x width: we should insert batch dimension at position 0,
# however, since both channel and batch dimension has same size 1, it is same to insert at position 1
# for simplicity, we insert a dimension of size 1 at position 1 for both cases
image = image.unsqueeze(1)
else:
# if it is a numpy array, it could have 2 possible shapes:
# 1. batch x height x width: insert channel dimension on last position
# 2. height x width x channel: insert batch dimension on first position
if image.shape[-1] == 1:
image = np.expand_dims(image, axis=0)
else:
image = np.expand_dims(image, axis=-1)
if isinstance(image, supported_formats):
image = [image]
elif not (isinstance(image, list) and all(isinstance(i, supported_formats) for i in image)):
raise ValueError(
f"Input is in incorrect format: {[type(i) for i in image]}. Currently, we only support {', '.join(supported_formats)}"
)
if isinstance(image[0], PIL.Image.Image):
if self.config.do_convert_rgb:
image = [self.convert_to_rgb(i) for i in image]
elif self.config.do_convert_grayscale:
image = [self.convert_to_grayscale(i) for i in image]
if self.config.do_resize:
height, width = self.get_default_height_width(image[0], height, width)
image = [self.resize(i, height, width) for i in image]
image = self.pil_to_numpy(image) # to np
image = self.numpy_to_pt(image) # to pt
elif isinstance(image[0], np.ndarray):
image = np.concatenate(image, axis=0) if image[0].ndim == 4 else np.stack(image, axis=0)
image = self.numpy_to_pt(image)
height, width = self.get_default_height_width(image, height, width)
if self.config.do_resize:
image = self.resize(image, height, width)
elif isinstance(image[0], torch.Tensor):
image = torch.cat(image, axis=0) if image[0].ndim == 4 else torch.stack(image, axis=0)
if self.config.do_convert_grayscale and image.ndim == 3:
image = image.unsqueeze(1)
channel = image.shape[1]
# don't need any preprocess if the image is latents
if channel == 4:
return image
height, width = self.get_default_height_width(image, height, width)
if self.config.do_resize:
image = self.resize(image, height, width)
# expected range [0,1], normalize to [-1,1]
do_normalize = self.config.do_normalize
if do_normalize and image.min() < 0:
warnings.warn(
"Passing `image` as torch tensor with value range in [-1,1] is deprecated. The expected value range for image tensor is [0,1] "
f"when passing as pytorch tensor or numpy Array. You passed `image` with value range [{image.min()},{image.max()}]",
FutureWarning,
)
do_normalize = False
if do_normalize:
image = self.normalize(image)
if self.config.do_binarize:
image = self.binarize(image)
return image
def postprocess(
self,
image: torch.FloatTensor,
output_type: str = "pil",
do_denormalize: Optional[List[bool]] = None,
) -> Union[PIL.Image.Image, np.ndarray, torch.FloatTensor]:
"""
Postprocess the image output from tensor to `output_type`.
Args:
image (`torch.FloatTensor`):
The image input, should be a pytorch tensor with shape `B x C x H x W`.
output_type (`str`, *optional*, defaults to `pil`):
The output type of the image, can be one of `pil`, `np`, `pt`, `latent`.
do_denormalize (`List[bool]`, *optional*, defaults to `None`):
Whether to denormalize the image to [0,1]. If `None`, will use the value of `do_normalize` in the
`VaeImageProcessor` config.
Returns:
`PIL.Image.Image`, `np.ndarray` or `torch.FloatTensor`:
The postprocessed image.
"""
if not isinstance(image, torch.Tensor):
raise ValueError(
f"Input for postprocessing is in incorrect format: {type(image)}. We only support pytorch tensor"
)
if output_type not in ["latent", "pt", "np", "pil"]:
deprecation_message = (
f"the output_type {output_type} is outdated and has been set to `np`. Please make sure to set it to one of these instead: "
"`pil`, `np`, `pt`, `latent`"
)
deprecate("Unsupported output_type", "1.0.0", deprecation_message, standard_warn=False)
output_type = "np"
if output_type == "latent":
return image
if do_denormalize is None:
do_denormalize = [self.config.do_normalize] * image.shape[0]
image = torch.stack(
[self.denormalize(image[i]) if do_denormalize[i] else image[i] for i in range(image.shape[0])]
)
if output_type == "pt":
return image
image = self.pt_to_numpy(image)
if output_type == "np":
return image
if output_type == "pil":
return self.numpy_to_pil(image)
class VaeImageProcessorLDM3D(VaeImageProcessor):
"""
Image processor for VAE LDM3D.
Args:
do_resize (`bool`, *optional*, defaults to `True`):
Whether to downscale the image's (height, width) dimensions to multiples of `vae_scale_factor`.
vae_scale_factor (`int`, *optional*, defaults to `8`):
VAE scale factor. If `do_resize` is `True`, the image is automatically resized to multiples of this factor.
resample (`str`, *optional*, defaults to `lanczos`):
Resampling filter to use when resizing the image.
do_normalize (`bool`, *optional*, defaults to `True`):
Whether to normalize the image to [-1,1].
"""
config_name = CONFIG_NAME
@register_to_config
def __init__(
self,
do_resize: bool = True,
vae_scale_factor: int = 8,
resample: str = "lanczos",
do_normalize: bool = True,
):
super().__init__()
@staticmethod
def numpy_to_pil(images: np.ndarray) -> List[PIL.Image.Image]:
"""
Convert a NumPy image or a batch of images to a PIL image.
"""
if images.ndim == 3:
images = images[None, ...]
images = (images * 255).round().astype("uint8")
if images.shape[-1] == 1:
# special case for grayscale (single channel) images
pil_images = [Image.fromarray(image.squeeze(), mode="L") for image in images]
else:
pil_images = [Image.fromarray(image[:, :, :3]) for image in images]
return pil_images
@staticmethod
def depth_pil_to_numpy(images: Union[List[PIL.Image.Image], PIL.Image.Image]) -> np.ndarray:
"""
Convert a PIL image or a list of PIL images to NumPy arrays.
"""
if not isinstance(images, list):
images = [images]
images = [np.array(image).astype(np.float32) / (2**16 - 1) for image in images]
images = np.stack(images, axis=0)
return images
@staticmethod
def rgblike_to_depthmap(image: Union[np.ndarray, torch.Tensor]) -> Union[np.ndarray, torch.Tensor]:
"""
Args:
image: RGB-like depth image
Returns: depth map
"""
return image[:, :, 1] * 2**8 + image[:, :, 2]
def numpy_to_depth(self, images: np.ndarray) -> List[PIL.Image.Image]:
"""
Convert a NumPy depth image or a batch of images to a PIL image.
"""
if images.ndim == 3:
images = images[None, ...]
images_depth = images[:, :, :, 3:]
if images.shape[-1] == 6:
images_depth = (images_depth * 255).round().astype("uint8")
pil_images = [
Image.fromarray(self.rgblike_to_depthmap(image_depth), mode="I;16") for image_depth in images_depth
]
elif images.shape[-1] == 4:
images_depth = (images_depth * 65535.0).astype(np.uint16)
pil_images = [Image.fromarray(image_depth, mode="I;16") for image_depth in images_depth]
else:
raise Exception("Not supported")
return pil_images
def postprocess(
self,
image: torch.FloatTensor,
output_type: str = "pil",
do_denormalize: Optional[List[bool]] = None,
) -> Union[PIL.Image.Image, np.ndarray, torch.FloatTensor]:
"""
Postprocess the image output from tensor to `output_type`.
Args:
image (`torch.FloatTensor`):
The image input, should be a pytorch tensor with shape `B x C x H x W`.
output_type (`str`, *optional*, defaults to `pil`):
The output type of the image, can be one of `pil`, `np`, `pt`, `latent`.
do_denormalize (`List[bool]`, *optional*, defaults to `None`):
Whether to denormalize the image to [0,1]. If `None`, will use the value of `do_normalize` in the
`VaeImageProcessor` config.
Returns:
`PIL.Image.Image`, `np.ndarray` or `torch.FloatTensor`:
The postprocessed image.
"""
if not isinstance(image, torch.Tensor):
raise ValueError(
f"Input for postprocessing is in incorrect format: {type(image)}. We only support pytorch tensor"
)
if output_type not in ["latent", "pt", "np", "pil"]:
deprecation_message = (
f"the output_type {output_type} is outdated and has been set to `np`. Please make sure to set it to one of these instead: "
"`pil`, `np`, `pt`, `latent`"
)
deprecate("Unsupported output_type", "1.0.0", deprecation_message, standard_warn=False)
output_type = "np"
if do_denormalize is None:
do_denormalize = [self.config.do_normalize] * image.shape[0]
image = torch.stack(
[self.denormalize(image[i]) if do_denormalize[i] else image[i] for i in range(image.shape[0])]
)
image = self.pt_to_numpy(image)
if output_type == "np":
if image.shape[-1] == 6:
image_depth = np.stack([self.rgblike_to_depthmap(im[:, :, 3:]) for im in image], axis=0)
else:
image_depth = image[:, :, :, 3:]
return image[:, :, :, :3], image_depth
if output_type == "pil":
return self.numpy_to_pil(image), self.numpy_to_depth(image)
else:
raise Exception(f"This type {output_type} is not supported")
def preprocess(
self,
rgb: Union[torch.FloatTensor, PIL.Image.Image, np.ndarray],
depth: Union[torch.FloatTensor, PIL.Image.Image, np.ndarray],
height: Optional[int] = None,
width: Optional[int] = None,
target_res: Optional[int] = None,
) -> torch.Tensor:
"""
Preprocess the image input. Accepted formats are PIL images, NumPy arrays or PyTorch tensors.
"""
supported_formats = (PIL.Image.Image, np.ndarray, torch.Tensor)
# Expand the missing dimension for 3-dimensional pytorch tensor or numpy array that represents grayscale image
if self.config.do_convert_grayscale and isinstance(rgb, (torch.Tensor, np.ndarray)) and rgb.ndim == 3:
raise Exception("This is not yet supported")
if isinstance(rgb, supported_formats):
rgb = [rgb]
depth = [depth]
elif not (isinstance(rgb, list) and all(isinstance(i, supported_formats) for i in rgb)):
raise ValueError(
f"Input is in incorrect format: {[type(i) for i in rgb]}. Currently, we only support {', '.join(supported_formats)}"
)
if isinstance(rgb[0], PIL.Image.Image):
if self.config.do_convert_rgb:
raise Exception("This is not yet supported")
# rgb = [self.convert_to_rgb(i) for i in rgb]
# depth = [self.convert_to_depth(i) for i in depth] #TODO define convert_to_depth
if self.config.do_resize or target_res:
height, width = self.get_default_height_width(rgb[0], height, width) if not target_res else target_res
rgb = [self.resize(i, height, width) for i in rgb]
depth = [self.resize(i, height, width) for i in depth]
rgb = self.pil_to_numpy(rgb) # to np
rgb = self.numpy_to_pt(rgb) # to pt
depth = self.depth_pil_to_numpy(depth) # to np
depth = self.numpy_to_pt(depth) # to pt
elif isinstance(rgb[0], np.ndarray):
rgb = np.concatenate(rgb, axis=0) if rgb[0].ndim == 4 else np.stack(rgb, axis=0)
rgb = self.numpy_to_pt(rgb)
height, width = self.get_default_height_width(rgb, height, width)
if self.config.do_resize:
rgb = self.resize(rgb, height, width)
depth = np.concatenate(depth, axis=0) if rgb[0].ndim == 4 else np.stack(depth, axis=0)
depth = self.numpy_to_pt(depth)
height, width = self.get_default_height_width(depth, height, width)
if self.config.do_resize:
depth = self.resize(depth, height, width)
elif isinstance(rgb[0], torch.Tensor):
raise Exception("This is not yet supported")
# rgb = torch.cat(rgb, axis=0) if rgb[0].ndim == 4 else torch.stack(rgb, axis=0)
# if self.config.do_convert_grayscale and rgb.ndim == 3:
# rgb = rgb.unsqueeze(1)
# channel = rgb.shape[1]
# height, width = self.get_default_height_width(rgb, height, width)
# if self.config.do_resize:
# rgb = self.resize(rgb, height, width)
# depth = torch.cat(depth, axis=0) if depth[0].ndim == 4 else torch.stack(depth, axis=0)
# if self.config.do_convert_grayscale and depth.ndim == 3:
# depth = depth.unsqueeze(1)
# channel = depth.shape[1]
# # don't need any preprocess if the image is latents
# if depth == 4:
# return rgb, depth
# height, width = self.get_default_height_width(depth, height, width)
# if self.config.do_resize:
# depth = self.resize(depth, height, width)
# expected range [0,1], normalize to [-1,1]
do_normalize = self.config.do_normalize
if rgb.min() < 0 and do_normalize:
warnings.warn(
"Passing `image` as torch tensor with value range in [-1,1] is deprecated. The expected value range for image tensor is [0,1] "
f"when passing as pytorch tensor or numpy Array. You passed `image` with value range [{rgb.min()},{rgb.max()}]",
FutureWarning,
)
do_normalize = False
if do_normalize:
rgb = self.normalize(rgb)
depth = self.normalize(depth)
if self.config.do_binarize:
rgb = self.binarize(rgb)
depth = self.binarize(depth)
return rgb, depth