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import cv2
import numpy as np
from skimage import transform as trans
src1 = np.array([[51.642, 50.115], [57.617, 49.990], [35.740, 69.007],
[51.157, 89.050], [57.025, 89.702]],
dtype=np.float32)
#<--left
src2 = np.array([[45.031, 50.118], [65.568, 50.872], [39.677, 68.111],
[45.177, 86.190], [64.246, 86.758]],
dtype=np.float32)
#---frontal
src3 = np.array([[39.730, 51.138], [72.270, 51.138], [56.000, 68.493],
[42.463, 87.010], [69.537, 87.010]],
dtype=np.float32)
#-->right
src4 = np.array([[46.845, 50.872], [67.382, 50.118], [72.737, 68.111],
[48.167, 86.758], [67.236, 86.190]],
dtype=np.float32)
#-->right profile
src5 = np.array([[54.796, 49.990], [60.771, 50.115], [76.673, 69.007],
[55.388, 89.702], [61.257, 89.050]],
dtype=np.float32)
src = np.array([src1, src2, src3, src4, src5])
src_map = {112: src, 224: src * 2}
arcface_src = np.array(
[[38.2946, 51.6963], [73.5318, 51.5014], [56.0252, 71.7366],
[41.5493, 92.3655], [70.7299, 92.2041]],
dtype=np.float32)
arcface_src = np.expand_dims(arcface_src, axis=0)
# In[66]:
# lmk is prediction; src is template
def estimate_norm(lmk, image_size=112, mode='arcface'):
assert lmk.shape == (5, 2)
tform = trans.SimilarityTransform()
lmk_tran = np.insert(lmk, 2, values=np.ones(5), axis=1)
min_M = []
min_index = []
min_error = float('inf')
if mode == 'arcface':
if image_size == 112:
src = arcface_src
else:
src = float(image_size) / 112 * arcface_src
else:
src = src_map[image_size]
for i in np.arange(src.shape[0]):
tform.estimate(lmk, src[i])
M = tform.params[0:2, :]
results = np.dot(M, lmk_tran.T)
results = results.T
error = np.sum(np.sqrt(np.sum((results - src[i])**2, axis=1)))
# print(error)
if error < min_error:
min_error = error
min_M = M
min_index = i
return min_M, min_index
def norm_crop(img, landmark, image_size=112, mode='arcface'):
M, pose_index = estimate_norm(landmark, image_size, mode)
warped = cv2.warpAffine(img, M, (image_size, image_size), borderValue=0.0)
return warped
def square_crop(im, S):
if im.shape[0] > im.shape[1]:
height = S
width = int(float(im.shape[1]) / im.shape[0] * S)
scale = float(S) / im.shape[0]
else:
width = S
height = int(float(im.shape[0]) / im.shape[1] * S)
scale = float(S) / im.shape[1]
resized_im = cv2.resize(im, (width, height))
det_im = np.zeros((S, S, 3), dtype=np.uint8)
det_im[:resized_im.shape[0], :resized_im.shape[1], :] = resized_im
return det_im, scale
def transform(data, center, output_size, scale, rotation):
scale_ratio = scale
rot = float(rotation) * np.pi / 180.0
#translation = (output_size/2-center[0]*scale_ratio, output_size/2-center[1]*scale_ratio)
t1 = trans.SimilarityTransform(scale=scale_ratio)
cx = center[0] * scale_ratio
cy = center[1] * scale_ratio
t2 = trans.SimilarityTransform(translation=(-1 * cx, -1 * cy))
t3 = trans.SimilarityTransform(rotation=rot)
t4 = trans.SimilarityTransform(translation=(output_size / 2,
output_size / 2))
t = t1 + t2 + t3 + t4
M = t.params[0:2]
cropped = cv2.warpAffine(data,
M, (output_size, output_size),
borderValue=0.0)
return cropped, M
def trans_points2d(pts, M):
new_pts = np.zeros(shape=pts.shape, dtype=np.float32)
for i in range(pts.shape[0]):
pt = pts[i]
new_pt = np.array([pt[0], pt[1], 1.], dtype=np.float32)
new_pt = np.dot(M, new_pt)
#print('new_pt', new_pt.shape, new_pt)
new_pts[i] = new_pt[0:2]
return new_pts
def trans_points3d(pts, M):
scale = np.sqrt(M[0][0] * M[0][0] + M[0][1] * M[0][1])
#print(scale)
new_pts = np.zeros(shape=pts.shape, dtype=np.float32)
for i in range(pts.shape[0]):
pt = pts[i]
new_pt = np.array([pt[0], pt[1], 1.], dtype=np.float32)
new_pt = np.dot(M, new_pt)
#print('new_pt', new_pt.shape, new_pt)
new_pts[i][0:2] = new_pt[0:2]
new_pts[i][2] = pts[i][2] * scale
return new_pts
def trans_points(pts, M):
if pts.shape[1] == 2:
return trans_points2d(pts, M)
else:
return trans_points3d(pts, M)
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