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# coding: utf-8
"""
cropping function and the related preprocess functions for cropping
"""
import numpy as np
import os.path as osp
from math import sin, cos, acos, degrees
import cv2; cv2.setNumThreads(0); cv2.ocl.setUseOpenCL(False) # NOTE: enforce single thread
from .rprint import rprint as print
DTYPE = np.float32
CV2_INTERP = cv2.INTER_LINEAR
def make_abs_path(fn):
return osp.join(osp.dirname(osp.realpath(__file__)), fn)
def _transform_img(img, M, dsize, flags=CV2_INTERP, borderMode=None):
""" conduct similarity or affine transformation to the image, do not do border operation!
img:
M: 2x3 matrix or 3x3 matrix
dsize: target shape (width, height)
"""
if isinstance(dsize, tuple) or isinstance(dsize, list):
_dsize = tuple(dsize)
else:
_dsize = (dsize, dsize)
if borderMode is not None:
return cv2.warpAffine(img, M[:2, :], dsize=_dsize, flags=flags, borderMode=borderMode, borderValue=(0, 0, 0))
else:
return cv2.warpAffine(img, M[:2, :], dsize=_dsize, flags=flags)
def _transform_pts(pts, M):
""" conduct similarity or affine transformation to the pts
pts: Nx2 ndarray
M: 2x3 matrix or 3x3 matrix
return: Nx2
"""
return pts @ M[:2, :2].T + M[:2, 2]
def parse_pt2_from_pt101(pt101, use_lip=True):
"""
parsing the 2 points according to the 101 points, which cancels the roll
"""
# the former version use the eye center, but it is not robust, now use interpolation
pt_left_eye = np.mean(pt101[[39, 42, 45, 48]], axis=0) # left eye center
pt_right_eye = np.mean(pt101[[51, 54, 57, 60]], axis=0) # right eye center
if use_lip:
# use lip
pt_center_eye = (pt_left_eye + pt_right_eye) / 2
pt_center_lip = (pt101[75] + pt101[81]) / 2
pt2 = np.stack([pt_center_eye, pt_center_lip], axis=0)
else:
pt2 = np.stack([pt_left_eye, pt_right_eye], axis=0)
return pt2
def parse_pt2_from_pt106(pt106, use_lip=True):
"""
parsing the 2 points according to the 106 points, which cancels the roll
"""
pt_left_eye = np.mean(pt106[[33, 35, 40, 39]], axis=0) # left eye center
pt_right_eye = np.mean(pt106[[87, 89, 94, 93]], axis=0) # right eye center
if use_lip:
# use lip
pt_center_eye = (pt_left_eye + pt_right_eye) / 2
pt_center_lip = (pt106[52] + pt106[61]) / 2
pt2 = np.stack([pt_center_eye, pt_center_lip], axis=0)
else:
pt2 = np.stack([pt_left_eye, pt_right_eye], axis=0)
return pt2
def parse_pt2_from_pt203(pt203, use_lip=True):
"""
parsing the 2 points according to the 203 points, which cancels the roll
"""
pt_left_eye = np.mean(pt203[[0, 6, 12, 18]], axis=0) # left eye center
pt_right_eye = np.mean(pt203[[24, 30, 36, 42]], axis=0) # right eye center
if use_lip:
# use lip
pt_center_eye = (pt_left_eye + pt_right_eye) / 2
pt_center_lip = (pt203[48] + pt203[66]) / 2
pt2 = np.stack([pt_center_eye, pt_center_lip], axis=0)
else:
pt2 = np.stack([pt_left_eye, pt_right_eye], axis=0)
return pt2
def parse_pt2_from_pt68(pt68, use_lip=True):
"""
parsing the 2 points according to the 68 points, which cancels the roll
"""
lm_idx = np.array([31, 37, 40, 43, 46, 49, 55], dtype=np.int32) - 1
if use_lip:
pt5 = np.stack([
np.mean(pt68[lm_idx[[1, 2]], :], 0), # left eye
np.mean(pt68[lm_idx[[3, 4]], :], 0), # right eye
pt68[lm_idx[0], :], # nose
pt68[lm_idx[5], :], # lip
pt68[lm_idx[6], :] # lip
], axis=0)
pt2 = np.stack([
(pt5[0] + pt5[1]) / 2,
(pt5[3] + pt5[4]) / 2
], axis=0)
else:
pt2 = np.stack([
np.mean(pt68[lm_idx[[1, 2]], :], 0), # left eye
np.mean(pt68[lm_idx[[3, 4]], :], 0), # right eye
], axis=0)
return pt2
def parse_pt2_from_pt5(pt5, use_lip=True):
"""
parsing the 2 points according to the 5 points, which cancels the roll
"""
if use_lip:
pt2 = np.stack([
(pt5[0] + pt5[1]) / 2,
(pt5[3] + pt5[4]) / 2
], axis=0)
else:
pt2 = np.stack([
pt5[0],
pt5[1]
], axis=0)
return pt2
def parse_pt2_from_pt_x(pts, use_lip=True):
if pts.shape[0] == 101:
pt2 = parse_pt2_from_pt101(pts, use_lip=use_lip)
elif pts.shape[0] == 106:
pt2 = parse_pt2_from_pt106(pts, use_lip=use_lip)
elif pts.shape[0] == 68:
pt2 = parse_pt2_from_pt68(pts, use_lip=use_lip)
elif pts.shape[0] == 5:
pt2 = parse_pt2_from_pt5(pts, use_lip=use_lip)
elif pts.shape[0] == 203:
pt2 = parse_pt2_from_pt203(pts, use_lip=use_lip)
elif pts.shape[0] > 101:
# take the first 101 points
pt2 = parse_pt2_from_pt101(pts[:101], use_lip=use_lip)
else:
raise Exception(f'Unknow shape: {pts.shape}')
if not use_lip:
# NOTE: to compile with the latter code, need to rotate the pt2 90 degrees clockwise manually
v = pt2[1] - pt2[0]
pt2[1, 0] = pt2[0, 0] - v[1]
pt2[1, 1] = pt2[0, 1] + v[0]
return pt2
def parse_rect_from_landmark(
pts,
scale=1.5,
need_square=True,
vx_ratio=0,
vy_ratio=0,
use_deg_flag=False,
**kwargs
):
"""parsing center, size, angle from 101/68/5/x landmarks
vx_ratio: the offset ratio along the pupil axis x-axis, multiplied by size
vy_ratio: the offset ratio along the pupil axis y-axis, multiplied by size, which is used to contain more forehead area
judge with pts.shape
"""
pt2 = parse_pt2_from_pt_x(pts, use_lip=kwargs.get('use_lip', True))
uy = pt2[1] - pt2[0]
l = np.linalg.norm(uy)
if l <= 1e-3:
uy = np.array([0, 1], dtype=DTYPE)
else:
uy /= l
ux = np.array((uy[1], -uy[0]), dtype=DTYPE)
# the rotation degree of the x-axis, the clockwise is positive, the counterclockwise is negative (image coordinate system)
# print(uy)
# print(ux)
angle = acos(ux[0])
if ux[1] < 0:
angle = -angle
# rotation matrix
M = np.array([ux, uy])
# calculate the size which contains the angle degree of the bbox, and the center
center0 = np.mean(pts, axis=0)
rpts = (pts - center0) @ M.T # (M @ P.T).T = P @ M.T
lt_pt = np.min(rpts, axis=0)
rb_pt = np.max(rpts, axis=0)
center1 = (lt_pt + rb_pt) / 2
size = rb_pt - lt_pt
if need_square:
m = max(size[0], size[1])
size[0] = m
size[1] = m
size *= scale # scale size
center = center0 + ux * center1[0] + uy * center1[1] # counterclockwise rotation, equivalent to M.T @ center1.T
center = center + ux * (vx_ratio * size) + uy * \
(vy_ratio * size) # considering the offset in vx and vy direction
if use_deg_flag:
angle = degrees(angle)
return center, size, angle
def parse_bbox_from_landmark(pts, **kwargs):
center, size, angle = parse_rect_from_landmark(pts, **kwargs)
cx, cy = center
w, h = size
# calculate the vertex positions before rotation
bbox = np.array([
[cx-w/2, cy-h/2], # left, top
[cx+w/2, cy-h/2],
[cx+w/2, cy+h/2], # right, bottom
[cx-w/2, cy+h/2]
], dtype=DTYPE)
# construct rotation matrix
bbox_rot = bbox.copy()
R = np.array([
[np.cos(angle), -np.sin(angle)],
[np.sin(angle), np.cos(angle)]
], dtype=DTYPE)
# calculate the relative position of each vertex from the rotation center, then rotate these positions, and finally add the coordinates of the rotation center
bbox_rot = (bbox_rot - center) @ R.T + center
return {
'center': center, # 2x1
'size': size, # scalar
'angle': angle, # rad, counterclockwise
'bbox': bbox, # 4x2
'bbox_rot': bbox_rot, # 4x2
}
def crop_image_by_bbox(img, bbox, lmk=None, dsize=512, angle=None, flag_rot=False, **kwargs):
left, top, right, bot = bbox
if int(right - left) != int(bot - top):
print(f'right-left {right-left} != bot-top {bot-top}')
size = right - left
src_center = np.array([(left + right) / 2, (top + bot) / 2], dtype=DTYPE)
tgt_center = np.array([dsize / 2, dsize / 2], dtype=DTYPE)
s = dsize / size # scale
if flag_rot and angle is not None:
costheta, sintheta = cos(angle), sin(angle)
cx, cy = src_center[0], src_center[1] # ori center
tcx, tcy = tgt_center[0], tgt_center[1] # target center
# need to infer
M_o2c = np.array(
[[s * costheta, s * sintheta, tcx - s * (costheta * cx + sintheta * cy)],
[-s * sintheta, s * costheta, tcy - s * (-sintheta * cx + costheta * cy)]],
dtype=DTYPE
)
else:
M_o2c = np.array(
[[s, 0, tgt_center[0] - s * src_center[0]],
[0, s, tgt_center[1] - s * src_center[1]]],
dtype=DTYPE
)
# if flag_rot and angle is None:
# print('angle is None, but flag_rotate is True', style="bold yellow")
img_crop = _transform_img(img, M_o2c, dsize=dsize, borderMode=kwargs.get('borderMode', None))
lmk_crop = _transform_pts(lmk, M_o2c) if lmk is not None else None
M_o2c = np.vstack([M_o2c, np.array([0, 0, 1], dtype=DTYPE)])
M_c2o = np.linalg.inv(M_o2c)
# cv2.imwrite('crop.jpg', img_crop)
return {
'img_crop': img_crop,
'lmk_crop': lmk_crop,
'M_o2c': M_o2c,
'M_c2o': M_c2o,
}
def _estimate_similar_transform_from_pts(
pts,
dsize,
scale=1.5,
vx_ratio=0,
vy_ratio=-0.1,
flag_do_rot=True,
**kwargs
):
""" calculate the affine matrix of the cropped image from sparse points, the original image to the cropped image, the inverse is the cropped image to the original image
pts: landmark, 101 or 68 points or other points, Nx2
scale: the larger scale factor, the smaller face ratio
vx_ratio: x shift
vy_ratio: y shift, the smaller the y shift, the lower the face region
rot_flag: if it is true, conduct correction
"""
center, size, angle = parse_rect_from_landmark(
pts, scale=scale, vx_ratio=vx_ratio, vy_ratio=vy_ratio,
use_lip=kwargs.get('use_lip', True)
)
s = dsize / size[0] # scale
tgt_center = np.array([dsize / 2, dsize / 2], dtype=DTYPE) # center of dsize
if flag_do_rot:
costheta, sintheta = cos(angle), sin(angle)
cx, cy = center[0], center[1] # ori center
tcx, tcy = tgt_center[0], tgt_center[1] # target center
# need to infer
M_INV = np.array(
[[s * costheta, s * sintheta, tcx - s * (costheta * cx + sintheta * cy)],
[-s * sintheta, s * costheta, tcy - s * (-sintheta * cx + costheta * cy)]],
dtype=DTYPE
)
else:
M_INV = np.array(
[[s, 0, tgt_center[0] - s * center[0]],
[0, s, tgt_center[1] - s * center[1]]],
dtype=DTYPE
)
M_INV_H = np.vstack([M_INV, np.array([0, 0, 1])])
M = np.linalg.inv(M_INV_H)
# M_INV is from the original image to the cropped image, M is from the cropped image to the original image
return M_INV, M[:2, ...]
def crop_image(img, pts: np.ndarray, **kwargs):
dsize = kwargs.get('dsize', 224)
scale = kwargs.get('scale', 1.5) # 1.5 | 1.6
vy_ratio = kwargs.get('vy_ratio', -0.1) # -0.0625 | -0.1
M_INV, _ = _estimate_similar_transform_from_pts(
pts,
dsize=dsize,
scale=scale,
vy_ratio=vy_ratio,
flag_do_rot=kwargs.get('flag_do_rot', True),
)
img_crop = _transform_img(img, M_INV, dsize) # origin to crop
pt_crop = _transform_pts(pts, M_INV)
M_o2c = np.vstack([M_INV, np.array([0, 0, 1], dtype=DTYPE)])
M_c2o = np.linalg.inv(M_o2c)
ret_dct = {
'M_o2c': M_o2c, # from the original image to the cropped image 3x3
'M_c2o': M_c2o, # from the cropped image to the original image 3x3
'img_crop': img_crop, # the cropped image
'pt_crop': pt_crop, # the landmarks of the cropped image
}
return ret_dct
def average_bbox_lst(bbox_lst):
if len(bbox_lst) == 0:
return None
bbox_arr = np.array(bbox_lst)
return np.mean(bbox_arr, axis=0).tolist()
def prepare_paste_back(mask_crop, crop_M_c2o, dsize):
"""prepare mask for later image paste back
"""
mask_ori = _transform_img(mask_crop, crop_M_c2o, dsize)
mask_ori = mask_ori.astype(np.float32) / 255.
return mask_ori
def paste_back(img_crop, M_c2o, img_ori, mask_ori):
"""paste back the image
"""
dsize = (img_ori.shape[1], img_ori.shape[0])
result = _transform_img(img_crop, M_c2o, dsize=dsize)
result = np.clip(mask_ori * result + (1 - mask_ori) * img_ori, 0, 255).astype(np.uint8)
return result
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