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VAE Image Processor

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VAE Image Processor

The VaeImageProcessor provides a unified API for StableDiffusionPipelines to prepare image inputs for VAE encoding and post-processing outputs once they’re decoded. This includes transformations such as resizing, normalization, and conversion between PIL Image, PyTorch, and NumPy arrays.

All pipelines with VaeImageProcessor accept PIL Image, PyTorch tensor, or NumPy arrays as image inputs and return outputs based on the output_type argument by the user. You can pass encoded image latents directly to the pipeline and return latents from the pipeline as a specific output with the output_type argument (for example output_type="latent"). This allows you to take the generated latents from one pipeline and pass it to another pipeline as input without leaving the latent space. It also makes it much easier to use multiple pipelines together by passing PyTorch tensors directly between different pipelines.

VaeImageProcessor

class diffusers.image_processor.VaeImageProcessor

( 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 )

Parameters

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.

Image processor for VAE.

apply_overlay

( mask: Image init_image: Image image: Image crop_coords: Optional = None )

overlay the inpaint output to the original image

binarize

( image: Image ) → PIL.Image.Image

Parameters

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.

Create a mask.

blur

( image: Image blur_factor: int = 4 )

Applies Gaussian blur to an image.

convert_to_grayscale

( image: Image )

Converts a PIL image to grayscale format.

convert_to_rgb

( image: Image )

Converts a PIL image to RGB format.

denormalize

( images: Union )

Denormalize an image array to [0,1].

get_crop_region

( mask_image: Image width: int height: int pad = 0 ) → tuple

Parameters

mask_image (PIL.Image.Image) — Mask image.
width (int) — Width of the image to be processed.
height (int) — Height of the image to be processed.
pad (int, optional) — Padding to be added to the crop region. Defaults to 0.

Returns

tuple

(x1, y1, x2, y2) represent a rectangular region that contains all masked ares in an image and matches the original aspect ratio.

Finds a rectangular region that contains all masked ares in an image, and expands region to match the aspect ratio of the original image; for example, if user drew mask in a 128x32 region, and the dimensions for processing are 512x512, the region will be expanded to 128x128.

get_default_height_width

( image: Union height: Optional = None width: Optional = None )

Parameters

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.

This function return the height and width that are downscaled to the next integer multiple of vae_scale_factor.

normalize

( images: Union )

Normalize an image array to [-1,1].

numpy_to_pil

( images: ndarray )

Convert a numpy image or a batch of images to a PIL image.

numpy_to_pt

( images: ndarray )

Convert a NumPy image to a PyTorch tensor.

pil_to_numpy

( images: Union )

Convert a PIL image or a list of PIL images to NumPy arrays.

postprocess

( image: FloatTensor output_type: str = 'pil' do_denormalize: Optional = None ) → PIL.Image.Image, np.ndarray or torch.FloatTensor

Parameters

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.

Postprocess the image output from tensor to output_type.

preprocess

( image: Union height: Optional = None width: Optional = None resize_mode: str = 'default' crops_coords: Optional = None )

Parameters

image (pipeline_image_input) — The image input, accepted formats are PIL images, NumPy arrays, PyTorch tensors; Also accept list of supported formats.
height (int, optional, defaults to None) — The height in preprocessed image. If None, will use the get_default_height_width() to get default height.
width (int, optional, defaults to None) -- The width in preprocessed. If None, will use get_default_height_width() to get the default width.
resize_mode (str, optional, defaults to default) — The resize mode, can be one of default or fill. If default, will resize the image to fit within the specified width and height, and it may not maintaining the original aspect ratio. If fill, will resize the image to fit within the specified width and height, maintaining the aspect ratio, and then center the image within the dimensions, filling empty with data from image. If crop, will resize the image to fit within the specified width and height, maintaining the aspect ratio, and then center the image within the dimensions, cropping the excess. Note that resize_mode fill and crop are only supported for PIL image input.
crops_coords (List[Tuple[int, int, int, int]], optional, defaults to None) — The crop coordinates for each image in the batch. If None, will not crop the image.

Preprocess the image input.

pt_to_numpy

( images: FloatTensor )

Convert a PyTorch tensor to a NumPy image.

resize

( image: Union height: int width: int resize_mode: str = 'default' ) → PIL.Image.Image, np.ndarray or torch.Tensor

Parameters

image (PIL.Image.Image, np.ndarray or torch.Tensor) — The image input, can be a PIL image, numpy array or pytorch tensor.
height (int) — The height to resize to.
width (int) — The width to resize to.
resize_mode (str, optional, defaults to default) — The resize mode to use, can be one of default or fill. If default, will resize the image to fit within the specified width and height, and it may not maintaining the original aspect ratio. If fill, will resize the image to fit within the specified width and height, maintaining the aspect ratio, and then center the image within the dimensions, filling empty with data from image. If crop, will resize the image to fit within the specified width and height, maintaining the aspect ratio, and then center the image within the dimensions, cropping the excess. Note that resize_mode fill and crop are only supported for PIL image input.

Returns

PIL.Image.Image, np.ndarray or torch.Tensor

The resized image.

Resize image.

VaeImageProcessorLDM3D

The VaeImageProcessorLDM3D accepts RGB and depth inputs and returns RGB and depth outputs.

class diffusers.image_processor.VaeImageProcessorLDM3D

( do_resize: bool = True vae_scale_factor: int = 8 resample: str = 'lanczos' do_normalize: bool = True )

Parameters

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].

Image processor for VAE LDM3D.

depth_pil_to_numpy

( images: Union )

Convert a PIL image or a list of PIL images to NumPy arrays.

numpy_to_depth

( images: ndarray )

Convert a NumPy depth image or a batch of images to a PIL image.

numpy_to_pil

( images: ndarray )

Convert a NumPy image or a batch of images to a PIL image.

preprocess

( rgb: Union depth: Union height: Optional = None width: Optional = None target_res: Optional = None )

Preprocess the image input. Accepted formats are PIL images, NumPy arrays or PyTorch tensors.

rgblike_to_depthmap

( image: Union )

Returns: depth map

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