`ultralytics 8.0.135` remove deprecated `v5loader` (#3744)
Glenn Jocher
1 year ago
committed by
GitHub
parent
114470361e
commit
8ebe94d1e9
@ -1,89 +0,0 @@
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---
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description: Enhance image data with Albumentations CenterCrop, normalize, augment_hsv, replicate, random_perspective, cutout, & box_candidates.
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keywords: YOLO, object detection, data loaders, V5 augmentations, CenterCrop, normalize, random_perspective
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---
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## Albumentations
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.Albumentations
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<br><br>
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## LetterBox
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.LetterBox
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<br><br>
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## CenterCrop
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.CenterCrop
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<br><br>
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## ToTensor
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.ToTensor
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<br><br>
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## normalize
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.normalize
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<br><br>
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## denormalize
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.denormalize
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<br><br>
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## augment_hsv
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.augment_hsv
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<br><br>
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## hist_equalize
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.hist_equalize
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<br><br>
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## replicate
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.replicate
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<br><br>
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## letterbox
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.letterbox
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<br><br>
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## random_perspective
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.random_perspective
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<br><br>
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## copy_paste
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.copy_paste
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<br><br>
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## cutout
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.cutout
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<br><br>
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## mixup
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.mixup
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<br><br>
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## box_candidates
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.box_candidates
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<br><br>
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## classify_albumentations
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.classify_albumentations
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<br><br>
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## classify_transforms
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---
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### ::: ultralytics.yolo.data.dataloaders.v5augmentations.classify_transforms
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<br><br>
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@ -1,94 +0,0 @@
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---
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description: Efficiently load images and labels to models using Ultralytics YOLO's InfiniteDataLoader, LoadScreenshots, and LoadStreams.
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keywords: YOLO, data loader, image classification, object detection, Ultralytics
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---
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## InfiniteDataLoader
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.InfiniteDataLoader
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<br><br>
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## _RepeatSampler
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader._RepeatSampler
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<br><br>
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## LoadScreenshots
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.LoadScreenshots
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<br><br>
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## LoadImages
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.LoadImages
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<br><br>
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## LoadStreams
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.LoadStreams
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<br><br>
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## LoadImagesAndLabels
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.LoadImagesAndLabels
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<br><br>
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## ClassificationDataset
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.ClassificationDataset
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<br><br>
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## get_hash
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.get_hash
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<br><br>
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## exif_size
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.exif_size
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<br><br>
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## exif_transpose
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.exif_transpose
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<br><br>
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## seed_worker
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.seed_worker
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<br><br>
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## create_dataloader
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.create_dataloader
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<br><br>
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## img2label_paths
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.img2label_paths
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<br><br>
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## flatten_recursive
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.flatten_recursive
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<br><br>
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## extract_boxes
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.extract_boxes
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<br><br>
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## autosplit
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.autosplit
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<br><br>
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## verify_image_label
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.verify_image_label
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<br><br>
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## create_classification_dataloader
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---
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### ::: ultralytics.yolo.data.dataloaders.v5loader.create_classification_dataloader
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<br><br>
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@ -1,407 +0,0 @@
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# Ultralytics YOLO 🚀, AGPL-3.0 license
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"""
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Image augmentation functions
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"""
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import math
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import random
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import cv2
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import numpy as np
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import torch
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import torchvision.transforms as T
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import torchvision.transforms.functional as TF
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from ultralytics.yolo.utils import LOGGER, colorstr
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from ultralytics.yolo.utils.checks import check_version
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from ultralytics.yolo.utils.metrics import bbox_ioa
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from ultralytics.yolo.utils.ops import resample_segments, segment2box, xywhn2xyxy
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IMAGENET_MEAN = 0.485, 0.456, 0.406 # RGB mean
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IMAGENET_STD = 0.229, 0.224, 0.225 # RGB standard deviation
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class Albumentations:
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# YOLOv5 Albumentations class (optional, only used if package is installed)
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def __init__(self, size=640):
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"""Instantiate object with image augmentations for YOLOv5."""
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self.transform = None
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prefix = colorstr('albumentations: ')
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try:
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import albumentations as A
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check_version(A.__version__, '1.0.3', hard=True) # version requirement
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T = [
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A.RandomResizedCrop(height=size, width=size, scale=(0.8, 1.0), ratio=(0.9, 1.11), p=0.0),
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A.Blur(p=0.01),
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A.MedianBlur(p=0.01),
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A.ToGray(p=0.01),
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A.CLAHE(p=0.01),
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A.RandomBrightnessContrast(p=0.0),
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A.RandomGamma(p=0.0),
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A.ImageCompression(quality_lower=75, p=0.0)] # transforms
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self.transform = A.Compose(T, bbox_params=A.BboxParams(format='yolo', label_fields=['class_labels']))
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LOGGER.info(prefix + ', '.join(f'{x}'.replace('always_apply=False, ', '') for x in T if x.p))
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except ImportError: # package not installed, skip
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pass
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except Exception as e:
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LOGGER.info(f'{prefix}{e}')
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def __call__(self, im, labels, p=1.0):
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"""Transforms input image and labels with probability 'p'."""
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if self.transform and random.random() < p:
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new = self.transform(image=im, bboxes=labels[:, 1:], class_labels=labels[:, 0]) # transformed
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im, labels = new['image'], np.array([[c, *b] for c, b in zip(new['class_labels'], new['bboxes'])])
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return im, labels
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def normalize(x, mean=IMAGENET_MEAN, std=IMAGENET_STD, inplace=False):
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"""Denormalize RGB images x per ImageNet stats in BCHW format, i.e. = (x - mean) / std."""
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return TF.normalize(x, mean, std, inplace=inplace)
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def denormalize(x, mean=IMAGENET_MEAN, std=IMAGENET_STD):
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"""Denormalize RGB images x per ImageNet stats in BCHW format, i.e. = x * std + mean."""
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for i in range(3):
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x[:, i] = x[:, i] * std[i] + mean[i]
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return x
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def augment_hsv(im, hgain=0.5, sgain=0.5, vgain=0.5):
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"""HSV color-space augmentation."""
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if hgain or sgain or vgain:
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r = np.random.uniform(-1, 1, 3) * [hgain, sgain, vgain] + 1 # random gains
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hue, sat, val = cv2.split(cv2.cvtColor(im, cv2.COLOR_BGR2HSV))
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dtype = im.dtype # uint8
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x = np.arange(0, 256, dtype=r.dtype)
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lut_hue = ((x * r[0]) % 180).astype(dtype)
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lut_sat = np.clip(x * r[1], 0, 255).astype(dtype)
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lut_val = np.clip(x * r[2], 0, 255).astype(dtype)
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im_hsv = cv2.merge((cv2.LUT(hue, lut_hue), cv2.LUT(sat, lut_sat), cv2.LUT(val, lut_val)))
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cv2.cvtColor(im_hsv, cv2.COLOR_HSV2BGR, dst=im) # no return needed
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def hist_equalize(im, clahe=True, bgr=False):
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"""Equalize histogram on BGR image 'im' with im.shape(n,m,3) and range 0-255."""
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yuv = cv2.cvtColor(im, cv2.COLOR_BGR2YUV if bgr else cv2.COLOR_RGB2YUV)
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if clahe:
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c = cv2.createCLAHE(clipLimit=2.0, tileGridSize=(8, 8))
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yuv[:, :, 0] = c.apply(yuv[:, :, 0])
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else:
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yuv[:, :, 0] = cv2.equalizeHist(yuv[:, :, 0]) # equalize Y channel histogram
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return cv2.cvtColor(yuv, cv2.COLOR_YUV2BGR if bgr else cv2.COLOR_YUV2RGB) # convert YUV image to RGB
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def replicate(im, labels):
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"""Replicate labels."""
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h, w = im.shape[:2]
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boxes = labels[:, 1:].astype(int)
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x1, y1, x2, y2 = boxes.T
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s = ((x2 - x1) + (y2 - y1)) / 2 # side length (pixels)
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for i in s.argsort()[:round(s.size * 0.5)]: # smallest indices
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x1b, y1b, x2b, y2b = boxes[i]
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bh, bw = y2b - y1b, x2b - x1b
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yc, xc = int(random.uniform(0, h - bh)), int(random.uniform(0, w - bw)) # offset x, y
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x1a, y1a, x2a, y2a = [xc, yc, xc + bw, yc + bh]
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im[y1a:y2a, x1a:x2a] = im[y1b:y2b, x1b:x2b] # im4[ymin:ymax, xmin:xmax]
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labels = np.append(labels, [[labels[i, 0], x1a, y1a, x2a, y2a]], axis=0)
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return im, labels
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def letterbox(im, new_shape=(640, 640), color=(114, 114, 114), auto=True, scaleFill=False, scaleup=True, stride=32):
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"""Resize and pad image while meeting stride-multiple constraints."""
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shape = im.shape[:2] # current shape [height, width]
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if isinstance(new_shape, int):
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new_shape = (new_shape, new_shape)
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# Scale ratio (new / old)
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r = min(new_shape[0] / shape[0], new_shape[1] / shape[1])
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if not scaleup: # only scale down, do not scale up (for better val mAP)
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r = min(r, 1.0)
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# Compute padding
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ratio = r, r # width, height ratios
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new_unpad = int(round(shape[1] * r)), int(round(shape[0] * r))
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dw, dh = new_shape[1] - new_unpad[0], new_shape[0] - new_unpad[1] # wh padding
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if auto: # minimum rectangle
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dw, dh = np.mod(dw, stride), np.mod(dh, stride) # wh padding
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elif scaleFill: # stretch
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dw, dh = 0.0, 0.0
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new_unpad = (new_shape[1], new_shape[0])
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ratio = new_shape[1] / shape[1], new_shape[0] / shape[0] # width, height ratios
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dw /= 2 # divide padding into 2 sides
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dh /= 2
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if shape[::-1] != new_unpad: # resize
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im = cv2.resize(im, new_unpad, interpolation=cv2.INTER_LINEAR)
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top, bottom = int(round(dh - 0.1)), int(round(dh + 0.1))
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left, right = int(round(dw - 0.1)), int(round(dw + 0.1))
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im = cv2.copyMakeBorder(im, top, bottom, left, right, cv2.BORDER_CONSTANT, value=color) # add border
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return im, ratio, (dw, dh)
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def random_perspective(im,
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targets=(),
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segments=(),
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degrees=10,
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translate=.1,
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scale=.1,
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shear=10,
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perspective=0.0,
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border=(0, 0)):
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# torchvision.transforms.RandomAffine(degrees=(-10, 10), translate=(0.1, 0.1), scale=(0.9, 1.1), shear=(-10, 10))
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# targets = [cls, xyxy]
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height = im.shape[0] + border[0] * 2 # shape(h,w,c)
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width = im.shape[1] + border[1] * 2
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# Center
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C = np.eye(3)
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C[0, 2] = -im.shape[1] / 2 # x translation (pixels)
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C[1, 2] = -im.shape[0] / 2 # y translation (pixels)
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# Perspective
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P = np.eye(3)
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P[2, 0] = random.uniform(-perspective, perspective) # x perspective (about y)
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P[2, 1] = random.uniform(-perspective, perspective) # y perspective (about x)
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# Rotation and Scale
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R = np.eye(3)
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a = random.uniform(-degrees, degrees)
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# a += random.choice([-180, -90, 0, 90]) # add 90deg rotations to small rotations
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s = random.uniform(1 - scale, 1 + scale)
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# s = 2 ** random.uniform(-scale, scale)
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R[:2] = cv2.getRotationMatrix2D(angle=a, center=(0, 0), scale=s)
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# Shear
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S = np.eye(3)
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S[0, 1] = math.tan(random.uniform(-shear, shear) * math.pi / 180) # x shear (deg)
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S[1, 0] = math.tan(random.uniform(-shear, shear) * math.pi / 180) # y shear (deg)
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# Translation
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T = np.eye(3)
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T[0, 2] = random.uniform(0.5 - translate, 0.5 + translate) * width # x translation (pixels)
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T[1, 2] = random.uniform(0.5 - translate, 0.5 + translate) * height # y translation (pixels)
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# Combined rotation matrix
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M = T @ S @ R @ P @ C # order of operations (right to left) is IMPORTANT
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if (border[0] != 0) or (border[1] != 0) or (M != np.eye(3)).any(): # image changed
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if perspective:
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im = cv2.warpPerspective(im, M, dsize=(width, height), borderValue=(114, 114, 114))
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else: # affine
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im = cv2.warpAffine(im, M[:2], dsize=(width, height), borderValue=(114, 114, 114))
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# Visualize
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# import matplotlib.pyplot as plt
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# ax = plt.subplots(1, 2, figsize=(12, 6))[1].ravel()
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# ax[0].imshow(im[:, :, ::-1]) # base
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# ax[1].imshow(im2[:, :, ::-1]) # warped
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# Transform label coordinates
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n = len(targets)
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if n:
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use_segments = any(x.any() for x in segments)
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new = np.zeros((n, 4))
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if use_segments: # warp segments
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segments = resample_segments(segments) # upsample
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for i, segment in enumerate(segments):
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xy = np.ones((len(segment), 3))
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xy[:, :2] = segment
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xy = xy @ M.T # transform
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xy = xy[:, :2] / xy[:, 2:3] if perspective else xy[:, :2] # perspective rescale or affine
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# Clip
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new[i] = segment2box(xy, width, height)
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else: # warp boxes
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xy = np.ones((n * 4, 3))
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xy[:, :2] = targets[:, [1, 2, 3, 4, 1, 4, 3, 2]].reshape(n * 4, 2) # x1y1, x2y2, x1y2, x2y1
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xy = xy @ M.T # transform
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xy = (xy[:, :2] / xy[:, 2:3] if perspective else xy[:, :2]).reshape(n, 8) # perspective rescale or affine
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# Create new boxes
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x = xy[:, [0, 2, 4, 6]]
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y = xy[:, [1, 3, 5, 7]]
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new = np.concatenate((x.min(1), y.min(1), x.max(1), y.max(1))).reshape(4, n).T
|
||||
|
||||
# Clip
|
||||
new[:, [0, 2]] = new[:, [0, 2]].clip(0, width)
|
||||
new[:, [1, 3]] = new[:, [1, 3]].clip(0, height)
|
||||
|
||||
# Filter candidates
|
||||
i = box_candidates(box1=targets[:, 1:5].T * s, box2=new.T, area_thr=0.01 if use_segments else 0.10)
|
||||
targets = targets[i]
|
||||
targets[:, 1:5] = new[i]
|
||||
|
||||
return im, targets
|
||||
|
||||
|
||||
def copy_paste(im, labels, segments, p=0.5):
|
||||
"""Implement Copy-Paste augmentation https://arxiv.org/abs/2012.07177, labels as nx5 np.array(cls, xyxy)."""
|
||||
n = len(segments)
|
||||
if p and n:
|
||||
h, w, c = im.shape # height, width, channels
|
||||
im_new = np.zeros(im.shape, np.uint8)
|
||||
|
||||
# Calculate ioa first then select indexes randomly
|
||||
boxes = np.stack([w - labels[:, 3], labels[:, 2], w - labels[:, 1], labels[:, 4]], axis=-1) # (n, 4)
|
||||
ioa = bbox_ioa(boxes, labels[:, 1:5]) # intersection over area
|
||||
indexes = np.nonzero((ioa < 0.30).all(1))[0] # (N, )
|
||||
n = len(indexes)
|
||||
for j in random.sample(list(indexes), k=round(p * n)):
|
||||
l, box, s = labels[j], boxes[j], segments[j]
|
||||
labels = np.concatenate((labels, [[l[0], *box]]), 0)
|
||||
segments.append(np.concatenate((w - s[:, 0:1], s[:, 1:2]), 1))
|
||||
cv2.drawContours(im_new, [segments[j].astype(np.int32)], -1, (1, 1, 1), cv2.FILLED)
|
||||
|
||||
result = cv2.flip(im, 1) # augment segments (flip left-right)
|
||||
i = cv2.flip(im_new, 1).astype(bool)
|
||||
im[i] = result[i] # cv2.imwrite('debug.jpg', im) # debug
|
||||
|
||||
return im, labels, segments
|
||||
|
||||
|
||||
def cutout(im, labels, p=0.5):
|
||||
"""Applies image cutout augmentation https://arxiv.org/abs/1708.04552."""
|
||||
if random.random() < p:
|
||||
h, w = im.shape[:2]
|
||||
scales = [0.5] * 1 + [0.25] * 2 + [0.125] * 4 + [0.0625] * 8 + [0.03125] * 16 # image size fraction
|
||||
for s in scales:
|
||||
mask_h = random.randint(1, int(h * s)) # create random masks
|
||||
mask_w = random.randint(1, int(w * s))
|
||||
|
||||
# Box
|
||||
xmin = max(0, random.randint(0, w) - mask_w // 2)
|
||||
ymin = max(0, random.randint(0, h) - mask_h // 2)
|
||||
xmax = min(w, xmin + mask_w)
|
||||
ymax = min(h, ymin + mask_h)
|
||||
|
||||
# Apply random color mask
|
||||
im[ymin:ymax, xmin:xmax] = [random.randint(64, 191) for _ in range(3)]
|
||||
|
||||
# Return unobscured labels
|
||||
if len(labels) and s > 0.03:
|
||||
box = np.array([[xmin, ymin, xmax, ymax]], dtype=np.float32)
|
||||
ioa = bbox_ioa(box, xywhn2xyxy(labels[:, 1:5], w, h))[0] # intersection over area
|
||||
labels = labels[ioa < 0.60] # remove >60% obscured labels
|
||||
|
||||
return labels
|
||||
|
||||
|
||||
def mixup(im, labels, im2, labels2):
|
||||
"""Applies MixUp augmentation https://arxiv.org/pdf/1710.09412.pdf."""
|
||||
r = np.random.beta(32.0, 32.0) # mixup ratio, alpha=beta=32.0
|
||||
im = (im * r + im2 * (1 - r)).astype(np.uint8)
|
||||
labels = np.concatenate((labels, labels2), 0)
|
||||
return im, labels
|
||||
|
||||
|
||||
def box_candidates(box1, box2, wh_thr=2, ar_thr=100, area_thr=0.1, eps=1e-16): # box1(4,n), box2(4,n)
|
||||
# Compute candidate boxes: box1 before augment, box2 after augment, wh_thr (pixels), aspect_ratio_thr, area_ratio
|
||||
w1, h1 = box1[2] - box1[0], box1[3] - box1[1]
|
||||
w2, h2 = box2[2] - box2[0], box2[3] - box2[1]
|
||||
ar = np.maximum(w2 / (h2 + eps), h2 / (w2 + eps)) # aspect ratio
|
||||
return (w2 > wh_thr) & (h2 > wh_thr) & (w2 * h2 / (w1 * h1 + eps) > area_thr) & (ar < ar_thr) # candidates
|
||||
|
||||
|
||||
def classify_albumentations(
|
||||
augment=True,
|
||||
size=224,
|
||||
scale=(0.08, 1.0),
|
||||
ratio=(0.75, 1.0 / 0.75), # 0.75, 1.33
|
||||
hflip=0.5,
|
||||
vflip=0.0,
|
||||
jitter=0.4,
|
||||
mean=IMAGENET_MEAN,
|
||||
std=IMAGENET_STD,
|
||||
auto_aug=False):
|
||||
# YOLOv5 classification Albumentations (optional, only used if package is installed)
|
||||
prefix = colorstr('albumentations: ')
|
||||
try:
|
||||
import albumentations as A
|
||||
from albumentations.pytorch import ToTensorV2
|
||||
check_version(A.__version__, '1.0.3', hard=True) # version requirement
|
||||
if augment: # Resize and crop
|
||||
T = [A.RandomResizedCrop(height=size, width=size, scale=scale, ratio=ratio)]
|
||||
if auto_aug:
|
||||
# TODO: implement AugMix, AutoAug & RandAug in albumentation
|
||||
LOGGER.info(f'{prefix}auto augmentations are currently not supported')
|
||||
else:
|
||||
if hflip > 0:
|
||||
T += [A.HorizontalFlip(p=hflip)]
|
||||
if vflip > 0:
|
||||
T += [A.VerticalFlip(p=vflip)]
|
||||
if jitter > 0:
|
||||
jitter = float(jitter)
|
||||
T += [A.ColorJitter(jitter, jitter, jitter, 0)] # brightness, contrast, satuaration, 0 hue
|
||||
else: # Use fixed crop for eval set (reproducibility)
|
||||
T = [A.SmallestMaxSize(max_size=size), A.CenterCrop(height=size, width=size)]
|
||||
T += [A.Normalize(mean=mean, std=std), ToTensorV2()] # Normalize and convert to Tensor
|
||||
LOGGER.info(prefix + ', '.join(f'{x}'.replace('always_apply=False, ', '') for x in T if x.p))
|
||||
return A.Compose(T)
|
||||
|
||||
except ImportError: # package not installed, skip
|
||||
LOGGER.warning(f'{prefix}⚠️ not found, install with `pip install albumentations` (recommended)')
|
||||
except Exception as e:
|
||||
LOGGER.info(f'{prefix}{e}')
|
||||
|
||||
|
||||
def classify_transforms(size=224):
|
||||
"""Transforms to apply if albumentations not installed."""
|
||||
assert isinstance(size, int), f'ERROR: classify_transforms size {size} must be integer, not (list, tuple)'
|
||||
# T.Compose([T.ToTensor(), T.Resize(size), T.CenterCrop(size), T.Normalize(IMAGENET_MEAN, IMAGENET_STD)])
|
||||
return T.Compose([CenterCrop(size), ToTensor(), T.Normalize(IMAGENET_MEAN, IMAGENET_STD)])
|
||||
|
||||
|
||||
class LetterBox:
|
||||
# YOLOv5 LetterBox class for image preprocessing, i.e. T.Compose([LetterBox(size), ToTensor()])
|
||||
def __init__(self, size=(640, 640), auto=False, stride=32):
|
||||
"""Resizes and crops an image to a specified size for YOLOv5 preprocessing."""
|
||||
super().__init__()
|
||||
self.h, self.w = (size, size) if isinstance(size, int) else size
|
||||
self.auto = auto # pass max size integer, automatically solve for short side using stride
|
||||
self.stride = stride # used with auto
|
||||
|
||||
def __call__(self, im): # im = np.array HWC
|
||||
imh, imw = im.shape[:2]
|
||||
r = min(self.h / imh, self.w / imw) # ratio of new/old
|
||||
h, w = round(imh * r), round(imw * r) # resized image
|
||||
hs, ws = (math.ceil(x / self.stride) * self.stride for x in (h, w)) if self.auto else self.h, self.w
|
||||
top, left = round((hs - h) / 2 - 0.1), round((ws - w) / 2 - 0.1)
|
||||
im_out = np.full((self.h, self.w, 3), 114, dtype=im.dtype)
|
||||
im_out[top:top + h, left:left + w] = cv2.resize(im, (w, h), interpolation=cv2.INTER_LINEAR)
|
||||
return im_out
|
||||
|
||||
|
||||
class CenterCrop:
|
||||
# YOLOv5 CenterCrop class for image preprocessing, i.e. T.Compose([CenterCrop(size), ToTensor()])
|
||||
def __init__(self, size=640):
|
||||
"""Converts input image into tensor for YOLOv5 processing."""
|
||||
super().__init__()
|
||||
self.h, self.w = (size, size) if isinstance(size, int) else size
|
||||
|
||||
def __call__(self, im): # im = np.array HWC
|
||||
imh, imw = im.shape[:2]
|
||||
m = min(imh, imw) # min dimension
|
||||
top, left = (imh - m) // 2, (imw - m) // 2
|
||||
return cv2.resize(im[top:top + m, left:left + m], (self.w, self.h), interpolation=cv2.INTER_LINEAR)
|
||||
|
||||
|
||||
class ToTensor:
|
||||
# YOLOv5 ToTensor class for image preprocessing, i.e. T.Compose([LetterBox(size), ToTensor()])
|
||||
def __init__(self, half=False):
|
||||
"""Initialize ToTensor class for YOLOv5 image preprocessing."""
|
||||
super().__init__()
|
||||
self.half = half
|
||||
|
||||
def __call__(self, im): # im = np.array HWC in BGR order
|
||||
im = np.ascontiguousarray(im.transpose((2, 0, 1))[::-1]) # HWC to CHW -> BGR to RGB -> contiguous
|
||||
im = torch.from_numpy(im) # to torch
|
||||
im = im.half() if self.half else im.float() # uint8 to fp16/32
|
||||
im /= 255.0 # 0-255 to 0.0-1.0
|
||||
return im
|
||||
File diff suppressed because it is too large
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Reference in new issue