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# Copyright 2023 Bingxin Ke, ETH Zurich. All rights reserved.
# Last modified: 2024-05-24
#
# 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.
# --------------------------------------------------------------------------
# If you find this code useful, we kindly ask you to cite our paper in your work.
# Please find bibtex at: https://github.com/prs-eth/Marigold#-citation
# More information about the method can be found at https://marigoldmonodepth.github.io
# --------------------------------------------------------------------------
import matplotlib
import numpy as np
import torch
from torchvision.transforms import InterpolationMode
from torchvision.transforms.functional import resize
def colorize_depth_maps(
depth_map, min_depth, max_depth, cmap="Spectral", valid_mask=None
):
"""
Colorize depth maps.
"""
assert len(depth_map.shape) >= 2, "Invalid dimension"
if isinstance(depth_map, torch.Tensor):
depth = depth_map.detach().squeeze().numpy()
elif isinstance(depth_map, np.ndarray):
depth = depth_map.copy().squeeze()
# reshape to [ (B,) H, W ]
if depth.ndim < 3:
depth = depth[np.newaxis, :, :]
# colorize
cm = matplotlib.colormaps[cmap]
depth = ((depth - min_depth) / (max_depth - min_depth)).clip(0, 1)
img_colored_np = cm(depth, bytes=False)[:, :, :, 0:3] # value from 0 to 1
img_colored_np = np.rollaxis(img_colored_np, 3, 1)
if valid_mask is not None:
if isinstance(depth_map, torch.Tensor):
valid_mask = valid_mask.detach().numpy()
valid_mask = valid_mask.squeeze() # [H, W] or [B, H, W]
if valid_mask.ndim < 3:
valid_mask = valid_mask[np.newaxis, np.newaxis, :, :]
else:
valid_mask = valid_mask[:, np.newaxis, :, :]
valid_mask = np.repeat(valid_mask, 3, axis=1)
img_colored_np[~valid_mask] = 0
if isinstance(depth_map, torch.Tensor):
img_colored = torch.from_numpy(img_colored_np).float()
elif isinstance(depth_map, np.ndarray):
img_colored = img_colored_np
return img_colored
def chw2hwc(chw):
assert 3 == len(chw.shape)
if isinstance(chw, torch.Tensor):
hwc = torch.permute(chw, (1, 2, 0))
elif isinstance(chw, np.ndarray):
hwc = np.moveaxis(chw, 0, -1)
return hwc
def resize_max_res(
img: torch.Tensor,
max_edge_resolution: int,
resample_method: InterpolationMode = InterpolationMode.BILINEAR,
) -> torch.Tensor:
"""
Resize image to limit maximum edge length while keeping aspect ratio.
Args:
img (`torch.Tensor`):
Image tensor to be resized. Expected shape: [B, C, H, W]
max_edge_resolution (`int`):
Maximum edge length (pixel).
resample_method (`PIL.Image.Resampling`):
Resampling method used to resize images.
Returns:
`torch.Tensor`: Resized image.
"""
assert 4 == img.dim(), f"Invalid input shape {img.shape}"
original_height, original_width = img.shape[-2:]
downscale_factor = min(
max_edge_resolution / original_width, max_edge_resolution / original_height
)
new_width = int(original_width * downscale_factor)
new_height = int(original_height * downscale_factor)
resized_img = resize(img, (new_height, new_width), resample_method, antialias=True)
return resized_img
def get_tv_resample_method(method_str: str) -> InterpolationMode:
resample_method_dict = {
"bilinear": InterpolationMode.BILINEAR,
"bicubic": InterpolationMode.BICUBIC,
"nearest": InterpolationMode.NEAREST_EXACT,
"nearest-exact": InterpolationMode.NEAREST_EXACT,
}
resample_method = resample_method_dict.get(method_str, None)
if resample_method is None:
raise ValueError(f"Unknown resampling method: {resample_method}")
else:
return resample_method
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