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utils.py
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utils.py
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import json
import sys
import numpy as np
from scipy.spatial import ConvexHull
import os
import argparse
def load_face_segmentation(path: str):
'''
Load face segmentation which defines for each body model part
the faces that belong to it.
:param path: str - path to json file with defined face segmentation
'''
try:
with open(path, 'r') as f:
face_segmentation = json.load(f)
except FileNotFoundError:
sys.exit(f"No such file - {path}")
return face_segmentation
def convex_hull_from_3D_points(slice_segments: np.ndarray):
'''
Cretes convex hull from 3D points
:param slice_segments: np.ndarray, dim N x 2 x 3 representing N 3D segments
Returns:
:param slice_segments_hull: np.ndarray, dim N x 2 x 3 representing N 3D segments
that form the convex hull
'''
# stack all points in N x 3 array
merged_segment_points = np.concatenate(slice_segments)
unique_segment_points = np.unique(merged_segment_points,
axis=0)
# points lie in plane -- find which ax of x,y,z is redundant
redundant_plane_coord = np.argmin(np.max(unique_segment_points,axis=0) -
np.min(unique_segment_points,axis=0) )
non_redundant_coords = [x for x in range(3) if x!=redundant_plane_coord]
# create convex hull
hull = ConvexHull(unique_segment_points[:,non_redundant_coords])
segment_point_hull_inds = hull.simplices.reshape(-1)
slice_segments_hull = unique_segment_points[segment_point_hull_inds]
slice_segments_hull = slice_segments_hull.reshape(-1,2,3)
return slice_segments_hull
def filter_body_part_slices(slice_segments:np.ndarray,
sliced_faces:np.ndarray,
measurement_name: str,
circumf_2_bodypart: dict,
face_segmentation: dict
):
'''
Remove segments that are not in the appropriate body part
for the given measurement.
:param slice_segments: np.ndarray - (N,2,3) for N segments
represented as two 3D points
:param sliced_faces: np.ndarray - (N,) representing the indices of the
faces
:param measurement_name: str - name of the measurement
:param circumf_2_bodypart: dict - dict mapping measurement to body part
:param face_segmentation: dict - dict mapping body part to all faces belonging
to it
Return:
:param slice_segments: np.ndarray (K,2,3) where K < N, for K segments
represented as two 3D points that are in the
appropriate body part
'''
if measurement_name in circumf_2_bodypart.keys():
body_parts = circumf_2_bodypart[measurement_name]
if isinstance(body_parts,list):
body_part_faces = [face_index for body_part in body_parts
for face_index in face_segmentation[body_part]]
else:
body_part_faces = face_segmentation[body_parts]
N_sliced_faces = sliced_faces.shape[0]
keep_segments = []
for i in range(N_sliced_faces):
if sliced_faces[i] in body_part_faces:
keep_segments.append(i)
return slice_segments[keep_segments]
else:
return slice_segments
def point_segmentation_to_face_segmentation(
point_segmentation: dict,
faces: np.ndarray,
save_as: str = None):
"""
:param point_segmentation: dict - dict mapping body part to
all points belonging to it
:param faces: np.ndarray - (N,3) representing the indices of the faces
:param save_as: str - optional path to save face segmentation as json
"""
import json
from tqdm import tqdm
from collections import Counter
# create body parts to index mapping
mapping_bp2ind = dict(zip(point_segmentation.keys(),
range(len(point_segmentation.keys()))))
mapping_ind2bp = {v:k for k,v in mapping_bp2ind.items()}
# assign each face to body part index
faces_segmentation = np.zeros_like(faces)
for i,face in tqdm(enumerate(faces)):
for bp_name, bp_indices in point_segmentation.items():
bp_label = mapping_bp2ind[bp_name]
for k in range(3):
if face[k] in bp_indices:
faces_segmentation[i,k] = bp_label
# for each face, assign the most common body part
face_segmentation_final = np.zeros(faces_segmentation.shape[0])
for i,f in enumerate(faces_segmentation):
c = Counter(list(f))
face_segmentation_final[i] = c.most_common()[0][0]
# create dict with body part as key and faces as values
face_segmentation_dict = {k:[] for k in mapping_bp2ind.keys()}
for i,fff in enumerate(face_segmentation_final):
face_segmentation_dict[mapping_ind2bp[int(fff)]].append(i)
# save face segmentation
if save_as:
with open(save_as, 'w') as f:
json.dump(face_segmentation_dict, f)
return face_segmentation_dict
if __name__ == "__main__":
parser = argparse.ArgumentParser(description='Create face segmentation from \
point segmentation of smpl/smplx models.')
parser.add_argument('--create_face_segmentation', action='store_true')
args = parser.parse_args()
if args.create_face_segmentation:
import smplx
segm_path = "data/smplx/point_segmentation_meshcapade.json"
with open(segm_path,"r") as f:
point_segmentation = json.load(f)
model_path = "data/smplx"
smplx_faces = smplx.SMPLX(model_path,ext="pkl").faces
save_as = "data/smplx/smplx_body_parts_2_faces.json"
_ = point_segmentation_to_face_segmentation(point_segmentation,
smplx_faces,
save_as)