92 lines
3.0 KiB
Python
92 lines
3.0 KiB
Python
import glob
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import os
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import numpy as np
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import torch.utils.data.dataset
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from torch.utils.data import Dataset
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from torch.utils.data import DataLoader
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from torchvision import transforms
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from PIL import Image
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import ex4
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IMG_SIZE = 100
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class ImageDataset(Dataset):
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def __init__(self, image_dir):
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self.image_files = sorted(glob.glob(os.path.join(image_dir, "**", "*.jpg"), recursive=True))
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# Mean and std arrays could also be defined as class attributes
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# self.norm_mean = np.array([0.485, 0.456, 0.406], dtype=np.float32)
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# self.norm_std = np.array([0.229, 0.224, 0.225], dtype=np.float32)
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def __getitem__(self, index):
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# Open image file, convert to numpy array and scale to [0, 1]
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target_image = Image.open(self.image_files[index])
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# image = np.array(Image.open(self.image_files[index]), dtype=np.float32) / 255
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resize_transforms = transforms.Compose([
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transforms.Resize(size=IMG_SIZE),
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transforms.CenterCrop(size=(IMG_SIZE, IMG_SIZE)),
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])
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target_image = resize_transforms(target_image)
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target_image = preprocess(target_image)
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# calculate image with black grid
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doomed_image = ex4.ex4(target_image, (5, 5), (4, 4))
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# convert image to grayscale
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# target_image = rgb2gray(target_image) # todo look if gray image makes sense
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return doomed_image[0], np.transpose(target_image, (2, 0, 1))
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def __len__(self):
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return len(self.image_files)
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def preprocess(input: np.array) -> np.array:
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# normalize image from 0-1
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target_image = np.array(input, dtype=np.float64) / 255.0
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# Perform normalization for each channel
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# image = (image - self.norm_mean) / self.norm_std
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return target_image
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# postprecess should be the inverese function of preprocess!
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def postprocess(input: np.array) -> np.array:
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target_image = (input * 255.0).astype(np.uint8)
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return target_image
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def get_image_loader(path: str):
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image_dataset = ImageDataset(path)
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totlen = len(image_dataset)
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test_set_size = .001
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trains, tests = torch.utils.data.dataset.random_split(image_dataset, lengths=(totlen - int(totlen * test_set_size),
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int(totlen * test_set_size)),
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generator=torch.Generator().manual_seed(42))
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train_loader = DataLoader(
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trains,
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shuffle=True, # shuffle the order of our samples
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batch_size=5, # stack 4 samples to a minibatch
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num_workers=4 # no background workers (see comment below)
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)
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test_loader = DataLoader(
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tests,
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shuffle=True, # shuffle the order of our samples
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batch_size=1, # stack 4 samples to a minibatch
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num_workers=0 # no background workers (see comment below)
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)
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return train_loader, test_loader
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def rgb2gray(rgb_array: np.ndarray):
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r, g, b = rgb_array[:, :, 0], rgb_array[:, :, 1], rgb_array[:, :, 2]
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gray = 0.2989 * r + 0.5870 * g + 0.1140 * b
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return gray
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