概述
颜色扰动
对比度，亮度，明度，饱和度
def adjust_contrast(image, factor):
mean = image.mean(axis=0).mean(axis=0)
return _clip((image - mean) * factor + mean)
def adjust_brightness(image, delta):
return _clip(image + delta * 255)
def adjust_hue(image, delta):
image[..., 0] = np.mod(image[..., 0] + delta * 180, 180)
return image
def adjust_saturation(image, factor):
image[..., 1] = np.clip(image[..., 1] * factor, 0, 255)
return image
def _clip(image):
return np.clip(image, 0, 255).astype(np.uint8)
def _uniform(val_range):
return np.random.uniform(val_range[0], val_range[1])
class ColorDistort():
def __init__(
self,
contrast_range=(0.8, 1.2),
brightness_range=(-.2, .2),
hue_range=(-0.1, 0.1),
saturation_range=(0.8, 1.2)
):
self.contrast_range = contrast_range
self.brightness_range = brightness_range
self.hue_range = hue_range
self.saturation_range = saturation_range
def __call__(self, image):
if self.contrast_range is not None:
contrast_factor = _uniform(self.contrast_range)
image = adjust_contrast(image,contrast_factor)
if self.brightness_range is not None:
brightness_delta = _uniform(self.brightness_range)
image = adjust_brightness(image, brightness_delta)
if self.hue_range is not None or self.saturation_range is not None:
image = cv2.cvtColor(image, cv2.COLOR_BGR2HSV)
if self.hue_range is not None:
hue_delta = _uniform(self.hue_range)
image = adjust_hue(image, hue_delta)
if self.saturation_range is not None:
saturation_factor = _uniform(self.saturation_range)
image = adjust_saturation(image, saturation_factor)
image = cv2.cvtColor(image, cv2.COLOR_HSV2BGR)
return image
self.color_augmentor = ColorDistort()
image = cv2.imread(fname, cv2.IMREAD_COLOR)
image = image.astype(np.uint8)
image =self.color_augmentor(image)
图像高斯模糊和heatmap高斯模糊
def blur_heatmap(src, ksize=(3, 3)):
for i in range(src.shape[2]):
src[:, :, i] = cv2.GaussianBlur(src[:, :, i], ksize, 0)
amin, amax = src[:, :, i].min(), src[:, :, i].max() # 求最大最小值
if amax>0:
src[:, :, i] = (src[:, :, i] - amin) / (amax - amin) # (矩阵元素-最小值)/(最大值-最小值)
return src
def blur(src,ksize=(3,3)):
for i in range(src.shape[2]):
src[:, :, i]=cv2.GaussianBlur(src[:, :, i],ksize,1.5)
return src
灰度和通道变换
def gray(src):
g_img=cv2.cvtColor(src,cv2.COLOR_RGB2GRAY)
src[:,:,0]=g_img
src[:,:,1]=g_img
src[:,:,2]=g_img
return src
def swap_change(src):
a = [0,1,2]
k = random.sample(a, 3)
res=src.copy()
res[:,:,0]=src[:,:,k[0]]
res[:, :, 1] = src[:, :, k[1]]
res[:, :, 2] = src[:, :, k[2]]
return res
像素扰动
def pixel_jitter(src,p=0.5,max_=5.):
src=src.astype(np.float32)
if random.uniform(0, 1) < p:
pattern=(np.random.rand(src.shape[0], src.shape[1],src.shape[2])-0.5)*2*max_
img = src + pattern
img[img<0]=0
img[img >255] = 255
img = img.astype(np.uint8)
return img
else:
src = src.astype(np.uint8)
return src
几何变换
多线程离线旋转、翻转
import time
import threadpool
import os
from PIL import Image
name = ["/media/wxy/000F8E4B0002F751/test/"+name_ for name_ in os.listdir("./test")]
def create_read_img(filename):
# 读取图像
im = Image.open(filename)
out_h = im.transpose(Image.FLIP_LEFT_RIGHT)
out_w = im.transpose(Image.FLIP_TOP_BOTTOM)
out_90 = im.transpose(Image.ROTATE_90)
out_180 = im.transpose(Image.ROTATE_180)
out_270 = im.transpose(Image.ROTATE_270)
out_h.save(filename[:-4] + '_h.png')
out_w.save(filename[:-4] + '_w.png')
out_90.save(filename[:-4] + '_90.png')
out_180.save(filename[:-4] + '_180.png')
out_270.save(filename[:-4] + '_270.png')
print(filename)
start_time = time.time()
pool = threadpool.ThreadPool(5)
requests = threadpool.makeRequests(create_read_img, name)
[pool.putRequest(req) for req in requests]
pool.wait()
print ('%d second'% (time.time()-start_time))
对图像中的roi区域进行仿射变换
def get_3rd_point(a, b):
direct = a - b
return b + np.array([-direct[1], direct[0]], dtype=np.float32)
def get_dir(src_point, rot_rad):
sn, cs = np.sin(rot_rad), np.cos(rot_rad)
src_result = [0, 0]
src_result[0] = src_point[0] * cs - src_point[1] * sn
src_result[1] = src_point[0] * sn + src_point[1] * cs
return src_result
def get_affine_transform(
center, scale, rot, output_size,
shift=np.array([0, 0], dtype=np.float32), inv=0
):
if not isinstance(scale, np.ndarray) and not isinstance(scale, list):
print(scale)
scale = np.array([scale, scale])
scale_tmp = scale * 200.0
src_w = scale_tmp[0]
dst_w = output_size[0]
dst_h = output_size[1]
rot_rad = np.pi * rot / 180
src_dir = get_dir([0, src_w * -0.5], rot_rad)
dst_dir = np.array([0, dst_w * -0.5], np.float32)
src = np.zeros((3, 2), dtype=np.float32)
dst = np.zeros((3, 2), dtype=np.float32)
src[0, :] = center + scale_tmp * shift
src[1, :] = center + src_dir + scale_tmp * shift
dst[0, :] = [dst_w * 0.5, dst_h * 0.5]
dst[1, :] = np.array([dst_w * 0.5, dst_h * 0.5]) + dst_dir
src[2:, :] = get_3rd_point(src[0, :], src[1, :])
dst[2:, :] = get_3rd_point(dst[0, :], dst[1, :])
if inv:
trans = cv2.getAffineTransform(np.float32(dst), np.float32(src))
else:
trans = cv2.getAffineTransform(np.float32(src), np.float32(dst))
return trans
data_numpy = cv2.imread(
image_file, cv2.IMREAD_COLOR | cv2.IMREAD_IGNORE_ORIENTATION
)
data_numpy = cv2.cvtColor(data_numpy, cv2.COLOR_BGR2RGB)
c = center #中心点
s = scale #尺度范围
sf = scale_factor #尺度因子
rf = rotation_factor #旋转因子
s = s * np.clip(np.random.randn()*sf + 1, 1 - sf, 1 + sf)
if random.random() <= 0.6 else 0 #随机调整尺度范围
r = np.clip(np.random.randn()*rf, -rf*2, rf*2)
if random.random() <= 0.6 else 0 #随机调整旋转范围
#随机翻转
if self.flip and random.random() <= 0.5:
data_numpy = data_numpy[:, ::-1, :]
c[0] = data_numpy.shape[1] - c[0] - 1
if self.flip and random.random() <= 0.5:
data_numpy = data_numpy[::-1, :, :]
c[1] = data_numpy.shape[0] - c[1] - 1
trans = get_affine_transform(c, s, r, self.image_size)
#trans = np.float32([[1, 0, 200], [0, 1, 100]]) 平移
#第一个参数旋转中心，第二个参数旋转角度，第三个参数：缩放比例, 生成一２＊３的矩
#trans = cv2.getRotationMatrix2D((cols/2,rows/2),90,1)
input = cv2.warpAffine(
data_numpy,
trans,
(int(self.image_size[0]), int(self.image_size[1])),
flags=cv2.INTER_LINEAR)
目标检测中的数据增强
DSFD人脸
随机大小
def Random_scale_withbbox(image,bboxes,target_shape,jitter=0.5):
###the boxes is in ymin,xmin,ymax,xmax mode
hi, wi, _ = image.shape
while 1:
if len(bboxes)==0:
print('errrrrrr')
bboxes_=np.array(bboxes)
crop_h = int(hi * random.uniform(0.2, 1))
crop_w = int(wi * random.uniform(0.2, 1))
start_h = random.randint(0, hi - crop_h)
start_w = random.randint(0, wi - crop_w)
croped = image[start_h:start_h + crop_h, start_w:start_w + crop_w, :]
bboxes_[:, 0] = bboxes_[:, 0] - start_w
bboxes_[:, 1] = bboxes_[:, 1] - start_h
bboxes_[:, 2] = bboxes_[:, 2] - start_w
bboxes_[:, 3] = bboxes_[:, 3] - start_h
bboxes_fix=box_in_img(croped,bboxes_)
if len(bboxes_fix)>0:
break
###use box
h,w=target_shape
croped_h,croped_w,_=croped.shape
croped_h_w_ratio=croped_h/croped_w
rescale_h=int(h * random.uniform(0.5, 1))
rescale_w = int(rescale_h/(random.uniform(0.7, 1.3)*croped_h_w_ratio))
rescale_w=np.clip(rescale_w,0,w)
image=cv2.resize(croped,(rescale_w,rescale_h))
bboxes_fix[:, 0] = bboxes_fix[:, 0] * rescale_w/ croped_w
bboxes_fix[:, 1] = bboxes_fix[:, 1] * rescale_h / croped_h
bboxes_fix[:, 2] = bboxes_fix[:, 2] * rescale_w / croped_w
bboxes_fix[:, 3] = bboxes_fix[:, 3] * rescale_h / croped_h
return image,bboxes_fix
随机翻转
def Random_flip(im, boxes):
im_lr = np.fliplr(im).copy()
h,w,_ = im.shape
xmin = w - boxes[:,2]
xmax = w - boxes[:,0]
boxes[:,0] = xmin
boxes[:,2] = xmax
return im_lr, boxes
随机剪切
class RandomSampleCrop(object):
"""Crop
Arguments:
img (Image): the image being input during training
boxes (Tensor): the original bounding boxes in pt form
labels (Tensor): the class labels for each bbox
mode (float tuple): the min and max jaccard overlaps
Return:
(img, boxes, classes)
img (Image): the cropped image
boxes (Tensor): the adjusted bounding boxes in pt form
labels (Tensor): the class labels for each bbox
"""
def __init__(self):
self.sample_options = (
# using entire original input image
None,
# sample a patch s.t. MIN jaccard w/ obj in .1,.3,.4,.7,.9
(0.1, None),
(0.3, None),
(0.7, None),
(0.9, None),
# randomly sample a patch
(None, None),
)
def __call__(self, image, boxes=None, labels=None):
height, width, _ = image.shape
while True:
# randomly choose a mode
mode = random.choice(self.sample_options)
if mode is None:
return image, boxes, labels
min_iou, max_iou = mode
if min_iou is None:
min_iou = float('-inf')
if max_iou is None:
max_iou = float('inf')
# max trails (50)
for _ in range(50):
current_image = image
w = random.uniform(0.3 * width, width)
h = random.uniform(0.3 * height, height)
# aspect ratio constraint b/t .5 & 2
if h / w < 0.5 or h / w > 2:
continue
left = random.uniform(0,width - w)
top = random.uniform(0,height - h)
# convert to integer rect x1,y1,x2,y2
rect = np.array([int(left), int(top), int(left+w), int(top+h)])
# calculate IoU (jaccard overlap) b/t the cropped and gt boxes
overlap = self.jaccard_numpy(boxes, rect)
# is min and max overlap constraint satisfied? if not try again
if overlap.min() < min_iou and max_iou < overlap.max():
continue
# cut the crop from the image
current_image = current_image[rect[1]:rect[3], rect[0]:rect[2],
:]
# keep overlap with gt box IF center in sampled patch
centers = (boxes[:, :2] + boxes[:, 2:]) / 2.0
# mask in all gt boxes that above and to the left of centers
m1 = (rect[0] < centers[:, 0]) * (rect[1] < centers[:, 1])
# mask in all gt boxes that under and to the right of centers
m2 = (rect[2] > centers[:, 0]) * (rect[3] > centers[:, 1])
# mask in that both m1 and m2 are true
mask = m1 * m2
# have any valid boxes? try again if not
if not mask.any():
continue
# take only matching gt boxes
current_boxes = boxes[mask, :].copy()
# take only matching gt labels
current_labels = labels[mask]
# should we use the box left and top corner or the crop's
current_boxes[:, :2] = np.maximum(current_boxes[:, :2],
rect[:2])
# adjust to crop (by substracting crop's left,top)
current_boxes[:, :2] -= rect[:2]
current_boxes[:, 2:] = np.minimum(current_boxes[:, 2:],
rect[2:])
# adjust to crop (by substracting crop's left,top)
current_boxes[:, 2:] -= rect[:2]
return current_image, current_boxes, current_labels
def jaccard_numpy(self,box_a, box_b):
"""Compute the jaccard overlap of two sets of boxes. The jaccard overlap
is simply the intersection over union of two boxes.
Args:
box_a: Multiple bounding boxes, Shape: [num_boxes,4]
box_b: Single bounding box, Shape: [4]
Return:
jaccard overlap: Shape: [box_a.shape[0], box_a.shape[1]]
"""
inter = self.intersect(box_a, box_b)
area_a = ((box_a[:, 2]-box_a[:, 0]) *
(box_a[:, 3]-box_a[:, 1])) # [A,B]
area_b = ((box_b[2]-box_b[0]) *
(box_b[3]-box_b[1])) # [A,B]
union = area_a + area_b - inter
return inter / union # [A,B]
def intersect(self,box_a, box_b):
max_xy = np.minimum(box_a[:, 2:], box_b[2:])
min_xy = np.maximum(box_a[:, :2], box_b[:2])
inter = np.clip((max_xy - min_xy), a_min=0, a_max=np.inf)
return inter[:, 0] * inter[:, 1]
dsfd_aug=RandomSampleCrop()
随机剪切
class RandomBaiduCrop(object):
"""Crop
Arguments:
img (Image): the image being input during training
boxes (Tensor): the original bounding boxes in pt form
labels (Tensor): the class labels for each bbox
mode (float tuple): the min and max jaccard overlaps
Return:
(img, boxes, classes)
img (Image): the cropped image
boxes (Tensor): the adjusted bounding boxes in pt form
labels (Tensor): the class labels for each bbox
"""
def __init__(self, size):
self.mean = np.array([103, 116, 123], dtype=np.float32)
self.maxSize = 12000 # max size
self.infDistance = 9999999
self.size = size
def __call__(self, image, boxes=None, labels=None):
height, width, _ = image.shape
random_counter = 0
boxArea = (boxes[:, 2] - boxes[:, 0] + 1) * (boxes[:, 3] - boxes[:, 1] + 1)
# argsort = np.argsort(boxArea)
# rand_idx = random.randint(min(len(argsort),6))
# print('rand idx',rand_idx)
rand_idx = random.randint(0,len(boxArea)-1)
rand_Side = boxArea[rand_idx] ** 0.5
# rand_Side = min(boxes[rand_idx,2] - boxes[rand_idx,0] + 1, boxes[rand_idx,3] - boxes[rand_idx,1] + 1)
anchors = [16, 32, 64, 128, 256, 512]
distance = self.infDistance
anchor_idx = 5
for i, anchor in enumerate(anchors):
if abs(anchor - rand_Side) < distance:
distance = abs(anchor - rand_Side)
anchor_idx = i
target_anchor = random.choice(anchors[0:min(anchor_idx + 1, 5) + 1])
ratio = float(target_anchor) / rand_Side
ratio = ratio * (2 ** random.uniform(-1, 1))
if int(height * ratio * width * ratio) > self.maxSize * self.maxSize:
ratio = (self.maxSize * self.maxSize / (height * width)) ** 0.5
interp_methods = [cv2.INTER_LINEAR, cv2.INTER_CUBIC, cv2.INTER_AREA, cv2.INTER_NEAREST, cv2.INTER_LANCZOS4]
interp_method = random.choice(interp_methods)
image = cv2.resize(image, None, None, fx=ratio, fy=ratio, interpolation=interp_method)
boxes[:, 0] *= ratio
boxes[:, 1] *= ratio
boxes[:, 2] *= ratio
boxes[:, 3] *= ratio
height, width, _ = image.shape
sample_boxes = []
xmin = boxes[rand_idx, 0]
ymin = boxes[rand_idx, 1]
bw = (boxes[rand_idx, 2] - boxes[rand_idx, 0] + 1)
bh = (boxes[rand_idx, 3] - boxes[rand_idx, 1] + 1)
w = h = self.size
for _ in range(50):
if w < max(height, width):
if bw <= w:
w_off = random.uniform(xmin + bw - w, xmin)
else:
w_off = random.uniform(xmin, xmin + bw - w)
if bh <= h:
h_off = random.uniform(ymin + bh - h, ymin)
else:
h_off = random.uniform(ymin, ymin + bh - h)
else:
w_off = random.uniform(width - w, 0)
h_off = random.uniform(height - h, 0)
w_off = math.floor(w_off)
h_off = math.floor(h_off)
# convert to integer rect x1,y1,x2,y2
rect = np.array([int(w_off), int(h_off), int(w_off + w), int(h_off + h)])
# keep overlap with gt box IF center in sampled patch
centers = (boxes[:, :2] + boxes[:, 2:]) / 2.0
# mask in all gt boxes that above and to the left of centers
m1 = (rect[0] <= boxes[:, 0]) * (rect[1] <= boxes[:, 1])
# mask in all gt boxes that under and to the right of centers
m2 = (rect[2] >= boxes[:, 2]) * (rect[3] >= boxes[:, 3])
# mask in that both m1 and m2 are true
mask = m1 * m2
overlap = self.jaccard_numpy(boxes, rect)
# have any valid boxes? try again if not
if not mask.any() and not overlap.max() > 0.7:
continue
else:
sample_boxes.append(rect)
if len(sample_boxes) > 0:
choice_idx = random.randint(0,len(sample_boxes)-1)
choice_box = sample_boxes[choice_idx]
# print('crop the box :',choice_box)
centers = (boxes[:, :2] + boxes[:, 2:]) / 2.0
m1 = (choice_box[0] < centers[:, 0]) * (choice_box[1] < centers[:, 1])
m2 = (choice_box[2] > centers[:, 0]) * (choice_box[3] > centers[:, 1])
mask = m1 * m2
current_boxes = boxes[mask, :].copy()
current_labels = labels[mask]
current_boxes[:, :2] -= choice_box[:2]
current_boxes[:, 2:] -= choice_box[:2]
if choice_box[0] < 0 or choice_box[1] < 0:
new_img_width = width if choice_box[0] >= 0 else width - choice_box[0]
new_img_height = height if choice_box[1] >= 0 else height - choice_box[1]
image_pad = np.zeros((new_img_height, new_img_width, 3), dtype=float)+np.array(cfg.DATA.PIXEL_MEAN,dtype=float)
start_left = 0 if choice_box[0] >= 0 else -choice_box[0]
start_top = 0 if choice_box[1] >= 0 else -choice_box[1]
image_pad[start_top:, start_left:, :] = image
choice_box_w = choice_box[2] - choice_box[0]
choice_box_h = choice_box[3] - choice_box[1]
start_left = choice_box[0] if choice_box[0] >= 0 else 0
start_top = choice_box[1] if choice_box[1] >= 0 else 0
end_right = start_left + choice_box_w
end_bottom = start_top + choice_box_h
current_image = image_pad[start_top:end_bottom, start_left:end_right, :].copy()
return current_image, current_boxes, current_labels
current_image = image[choice_box[1]:choice_box[3], choice_box[0]:choice_box[2], :].copy()
return current_image, current_boxes, current_labels
else:
return image, boxes, labels
def jaccard_numpy(self,box_a, box_b):
"""Compute the jaccard overlap of two sets of boxes. The jaccard overlap
is simply the intersection over union of two boxes.
Args:
box_a: Multiple bounding boxes, Shape: [num_boxes,4]
box_b: Single bounding box, Shape: [4]
Return:
jaccard overlap: Shape: [box_a.shape[0], box_a.shape[1]]
"""
inter = self.intersect(box_a, box_b)
area_a = ((box_a[:, 2]-box_a[:, 0]) *
(box_a[:, 3]-box_a[:, 1])) # [A,B]
area_b = ((box_b[2]-box_b[0]) *
(box_b[3]-box_b[1])) # [A,B]
union = area_a + area_b - inter
return inter / union # [A,B]
def intersect(self,box_a, box_b):
max_xy = np.minimum(box_a[:, 2:], box_b[2:])
min_xy = np.maximum(box_a[:, :2], box_b[:2])
inter = np.clip((max_xy - min_xy), a_min=0, a_max=np.inf)
return inter[:, 0] * inter[:, 1]
import sys
sys.path.append('.')
from train_config import config as cfg
baidu_aug=RandomBaiduCrop(cfg.DATA.hin)
sample_dice = random.uniform(0, 1)
if sample_dice > 0.8 and sample_dice <= 1:
image, boxes = Random_scale_withbbox(image, boxes, target_shape=[cfg.DATA.hin, cfg.DATA.win],
jitter=0.3)
elif sample_dice > 0.4 and sample_dice <= 0.8:
boxes_ = boxes[:, 0:4]
klass_ = boxes[:, 4:]
image, boxes_, klass_ = dsfd_aug(image, boxes_, klass_)
image = image.astype(np.uint8)
boxes = np.concatenate([boxes_, klass_], axis=1)
else:
boxes_ = boxes[:, 0:4]
klass_ = boxes[:, 4:]
image, boxes_, klass_ = baidu_aug(image, boxes_, klass_)
image = image.astype(np.uint8)
boxes = np.concatenate([boxes_, klass_], axis=1)
if random.uniform(0, 1) > 0.5:
image, boxes = Random_flip(image, boxes)
if random.uniform(0, 1) > 0.5:
image =self.color_augmentor(image)
最后
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