wehub-resource-sync
190 lines
5.4 KiB
Python
190 lines
5.4 KiB
Python
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import cv2
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import numpy as np
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from PIL import Image, ImageOps
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import torchvision.transforms as transforms
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from wand.image import Image as WandImage
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from scipy.ndimage import zoom as scizoom
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from skimage.filters import gaussian
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from wand.api import library as wandlibrary
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from io import BytesIO
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#from skimage import color
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from .ops import MotionImage, clipped_zoom, disk, plasma_fractal
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'''
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PIL resize (W,H)
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'''
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class GaussianBlur:
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def __init__(self):
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pass
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def __call__(self, img, mag=-1, prob=1.):
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if np.random.uniform(0,1) > prob:
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return img
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W, H = img.size
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#kernel = [(31,31)] prev 1 level only
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kernel = (31, 31)
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sigmas = [.5, 1, 2]
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if mag<0 or mag>=len(kernel):
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index = np.random.randint(0, len(sigmas))
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else:
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index = mag
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sigma = sigmas[index]
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return transforms.GaussianBlur(kernel_size=kernel, sigma=sigma)(img)
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class DefocusBlur:
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def __init__(self):
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pass
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def __call__(self, img, mag=-1, prob=1.):
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if np.random.uniform(0,1) > prob:
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return img
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n_channels = len(img.getbands())
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isgray = n_channels == 1
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#c = [(3, 0.1), (4, 0.5), (6, 0.5), (8, 0.5), (10, 0.5)]
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c = [(2, 0.1), (3, 0.1), (4, 0.1)] #, (6, 0.5)] #prev 2 levels only
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if mag<0 or mag>=len(c):
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index = np.random.randint(0, len(c))
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else:
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index = mag
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c = c[index]
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img = np.array(img) / 255.
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if isgray:
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img = np.expand_dims(img, axis=2)
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img = np.repeat(img, 3, axis=2)
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n_channels = 3
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kernel = disk(radius=c[0], alias_blur=c[1])
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channels = []
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for d in range(n_channels):
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channels.append(cv2.filter2D(img[:, :, d], -1, kernel))
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channels = np.array(channels).transpose((1, 2, 0)) # 3x224x224 -> 224x224x3
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#if isgray:
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# img = img[:,:,0]
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# img = np.squeeze(img)
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img = np.clip(channels, 0, 1) * 255
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img = Image.fromarray(img.astype(np.uint8))
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if isgray:
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img = ImageOps.grayscale(img)
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return img
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class MotionBlur:
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def __init__(self):
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pass
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def __call__(self, img, mag=-1, prob=1.):
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if np.random.uniform(0,1) > prob:
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return img
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n_channels = len(img.getbands())
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isgray = n_channels == 1
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#c = [(10, 3), (15, 5), (15, 8), (15, 12), (20, 15)]
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c = [(10, 3), (12, 4), (14, 5)]
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if mag<0 or mag>=len(c):
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index = np.random.randint(0, len(c))
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else:
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index = mag
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c = c[index]
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output = BytesIO()
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img.save(output, format='PNG')
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img = MotionImage(blob=output.getvalue())
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img.motion_blur(radius=c[0], sigma=c[1], angle=np.random.uniform(-45, 45))
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img = cv2.imdecode(np.fromstring(img.make_blob(), np.uint8), cv2.IMREAD_UNCHANGED)
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img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB)
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img = Image.fromarray(img.astype(np.uint8))
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if isgray:
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img = ImageOps.grayscale(img)
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return img
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class GlassBlur:
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def __init__(self):
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pass
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def __call__(self, img, mag=-1, prob=1.):
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if np.random.uniform(0,1) > prob:
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return img
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W, H = img.size
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#c = [(0.7, 1, 2), (0.9, 2, 1), (1, 2, 3), (1.1, 3, 2), (1.5, 4, 2)][severity - 1]
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c = [(0.7, 1, 2), (0.75, 1, 2), (0.8, 1, 2)] #, (1, 2, 3)] #prev 2 levels only
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if mag<0 or mag>=len(c):
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index = np.random.randint(0, len(c))
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else:
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index = mag
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c = c[index]
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img = np.uint8(gaussian(np.array(img) / 255., sigma=c[0], multichannel=True) * 255)
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# locally shuffle pixels
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for i in range(c[2]):
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for h in range(H - c[1], c[1], -1):
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for w in range(W - c[1], c[1], -1):
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dx, dy = np.random.randint(-c[1], c[1], size=(2,))
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h_prime, w_prime = h + dy, w + dx
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# swap
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img[h, w], img[h_prime, w_prime] = img[h_prime, w_prime], img[h, w]
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img = np.clip(gaussian(img / 255., sigma=c[0], multichannel=True), 0, 1) * 255
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return Image.fromarray(img.astype(np.uint8))
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class ZoomBlur:
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def __init__(self):
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pass
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def __call__(self, img, mag=-1, prob=1.):
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if np.random.uniform(0,1) > prob:
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return img
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W, H = img.size
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c = [np.arange(1, 1.11, .01),
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np.arange(1, 1.16, .01),
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np.arange(1, 1.21, .02)]
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if mag<0 or mag>=len(c):
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index = np.random.randint(0, len(c))
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else:
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index = mag
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c = c[index]
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n_channels = len(img.getbands())
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isgray = n_channels == 1
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uint8_img = img
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img = (np.array(img) / 255.).astype(np.float32)
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out = np.zeros_like(img)
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for zoom_factor in c:
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ZW = int(W*zoom_factor)
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ZH = int(H*zoom_factor)
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zoom_img = uint8_img.resize((ZW, ZH), Image.BICUBIC)
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x1 = (ZW - W) // 2
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y1 = (ZH - H) // 2
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x2 = x1 + W
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y2 = y1 + H
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zoom_img = zoom_img.crop((x1,y1,x2,y2))
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out += (np.array(zoom_img) / 255.).astype(np.float32)
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img = (img + out) / (len(c) + 1)
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img = np.clip(img, 0, 1) * 255
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img = Image.fromarray(img.astype(np.uint8))
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return img
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