def augment_sample(I,pts,dim):
maxsum,maxangle = 120,np.array([80.,80.,45.])
angles = np.random.rand(3)*maxangle
if angles.sum() > maxsum:
angles = (angles/angles.sum())*(maxangle/maxangle.sum())
I = im2single(I) # /255.0 归一化
iwh = getWH(I.shape) #得到宽高
whratio = random.uniform(2.,4.) # 随即取一个2-4的值作为宽高比
wsiz = random.uniform(dim*.2,dim*1.) # 宽取0.2*208 到 208之间
hsiz = wsiz/whratio
dx = random.uniform(0.,dim - wsiz)
dy = random.uniform(0.,dim - hsiz)
#下面涉及到整个变换
# In the first 3 lines, the original corner points are transformed into a rectangular bounding box with aspect ratio
# varying between 2:1 and 4:1. In other words, T matrix rectifies the LP with a random aspect ratio. Then,
pph = getRectPts(dx,dy,dx+wsiz,dy+hsiz)
pts = pts*iwh.reshape((2,1)) #将点恢复到真实坐标值
T = find_T_matrix(pts2ptsh(pts),pph)
#in the next two lines, a perspective transformation with random rotation (H) is combined with T to
#generate the final transformation.
H = perspective_transform((dim,dim),angles=angles)
H = np.matmul(H,T)
Iroi,pts = project(I,H,pts,dim)
hsv_mod = np.random.rand(3).astype('float32')
hsv_mod = (hsv_mod - .5)*.3
hsv_mod[0] *= 360
Iroi = hsv_transform(Iroi,hsv_mod)
Iroi = np.clip(Iroi,0.,1.)
pts = np.array(pts)
if random.random() > .5:
Iroi,pts = flip_image_and_pts(Iroi,pts)
tl,br = pts.min(1),pts.max(1)
llp = Label(0,tl,br)
return Iroi,llp,pts
def augment_sample(I,pts,dim):
maxsum,maxangle = 120,np.array([80.,80.,45.])
angles = np.random.rand(3)*maxangle
if angles.sum() > maxsum:
angles = (angles/angles.sum())*(maxangle/maxangle.sum())
# chuyển qua ma trận float32, chia cho 255
I = im2single(I)
# Lấy w, h dạng ma trận
iwh = getWH(I.shape)
whratio = random.uniform(2.,4.)
wsiz = random.uniform(dim*.2,dim*1.)
hsiz = wsiz/whratio
dx = random.uniform(0.,dim - wsiz)
dy = random.uniform(0.,dim - hsiz)
pph = getRectPts(dx,dy,dx+wsiz,dy+hsiz)
# Lấy tọa độ thật
pts = pts*iwh.reshape((2,1))
T = find_T_matrix(pts2ptsh(pts),pph)
H = perspective_transform((dim,dim),angles=angles)
H = np.matmul(H,T)
Iroi,pts = project(I,H,pts,dim)
hsv_mod = np.random.rand(3).astype('float32')
hsv_mod = (hsv_mod - .5)*.3
hsv_mod[0] *= 360
Iroi = hsv_transform(Iroi,hsv_mod)
Iroi = np.clip(Iroi,0.,1.)
pts = np.array(pts)
if random.random() > .5:
Iroi,pts = flip_image_and_pts(Iroi,pts)
# lấy giá trị tọa độ top-left, bot-right
tl,br = pts.min(1),pts.max(1)
llp = Label(0,tl,br)
return Iroi,llp,pts
