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pose2sim/Pose2Sim/personAssociation.py
davidpagnon 9438152ae0 multi-person analysis is almost there
2024-02-27 13:48:30 +01:00

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
'''
###########################################################################
## TRACKING OF PERSON OF INTEREST ##
###########################################################################
Openpose detects all people in the field of view.
Which is the one of interest?
This module tries all possible triangulations of a chosen anatomical
point. If "single_person" mode is used, it chooses the person for whom the
reprojection error is smallest. If multi-person is used, it selects all
persons with a reprojection error smaller than a threshold, and then
associates them across time frames by minimizing the displacement speed.
INPUTS:
- a calibration file (.toml extension)
- json files from each camera folders with several detected persons
- a Config.toml file
- a skeleton model
OUTPUTS:
- json files for each camera with only one person of interest
'''
## INIT
import os
import glob
import fnmatch
import numpy as np
import json
import itertools as it
import toml
from tqdm import tqdm
import cv2
from anytree import RenderTree
from anytree.importer import DictImporter
import logging
from Pose2Sim.common import retrieve_calib_params, computeP, weighted_triangulation, \
reprojection, euclidean_distance, natural_sort
from Pose2Sim.skeletons import *
## AUTHORSHIP INFORMATION
__author__ = "David Pagnon"
__copyright__ = "Copyright 2021, Pose2Sim"
__credits__ = ["David Pagnon"]
__license__ = "BSD 3-Clause License"
__version__ = '0.6'
__maintainer__ = "David Pagnon"
__email__ = "contact@david-pagnon.com"
__status__ = "Development"
## FUNCTIONS
def min_with_single_indices(L, T):
'''
Let L be a list (size s) with T associated tuple indices (size s).
Select the smallest values of L, considering that
the next smallest value cannot have the same numbers
in the associated tuple as any of the previous ones.
Example:
L = [ 20, 27, 51, 33, 43, 23, 37, 24, 4, 68, 84, 3 ]
T = list(it.product(range(2),range(3)))
= [(0,0),(0,1),(0,2),(0,3),(1,0),(1,1),(1,2),(1,3),(2,0),(2,1),(2,2),(2,3)]
- 1st smallest value: 3 with tuple (2,3), index 11
- 2nd smallest value when excluding indices (2,.) and (.,3), i.e. [(0,0),(0,1),(0,2),X,(1,0),(1,1),(1,2),X,X,X,X,X]:
20 with tuple (0,0), index 0
- 3rd smallest value when excluding [X,X,X,X,X,(1,1),(1,2),X,X,X,X,X]:
23 with tuple (1,1), index 5
INPUTS:
- L: list (size s)
- T: T associated tuple indices (size s)
OUTPUTS:
- minL: list of smallest values of L, considering constraints on tuple indices
- argminL: list of indices of smallest values of L
- T_minL: list of tuples associated with smallest values of L
'''
minL = [np.min(L)]
argminL = [np.argmin(L)]
T_minL = [T[argminL[0]]]
mask_tokeep = np.array([True for t in T])
i=0
while mask_tokeep.any()==True:
mask_tokeep = mask_tokeep & np.array([t[0]!=T_minL[i][0] and t[1]!=T_minL[i][1] for t in T])
if mask_tokeep.any()==True:
indicesL_tokeep = np.where(mask_tokeep)[0]
minL += [np.min(np.array(L)[indicesL_tokeep])]
argminL += [indicesL_tokeep[np.argmin(np.array(L)[indicesL_tokeep])]]
T_minL += (T[argminL[i+1]],)
i+=1
return minL, argminL, T_minL
def sort_people(Q_kpt_old, Q_kpt, nb_persons_to_detect):
'''
Associate persons across frames
Persons' indices are sometimes swapped when changing frame
A person is associated to another in the next frame when they are at a small distance
INPUTS:
- Q_kpt_old: list of arrays of 3D coordinates [X, Y, Z, 1.] for the previous frame
- Q_kpt: idem Q_kpt_old, for current frame
OUTPUT:
- Q_kpt: array with reordered persons
- personsIDs_sorted: index of reordered persons
'''
# Generate possible person correspondences across frames
personsIDs_comb = sorted(list(it.product(range(len(Q_kpt_old)),range(len(Q_kpt)))))
# Compute distance between persons from one frame to another
frame_by_frame_dist = []
for comb in personsIDs_comb:
frame_by_frame_dist += [euclidean_distance(Q_kpt_old[comb[0]][:3],Q_kpt[comb[1]][:3])]
# sort correspondences by distance
_, index_best_comb, _ = min_with_single_indices(frame_by_frame_dist, personsIDs_comb)
index_best_comb.sort()
personsIDs_sorted = np.array(personsIDs_comb)[index_best_comb][:,1]
# rearrange persons
Q_kpt = np.array(Q_kpt)[personsIDs_sorted]
return Q_kpt, personsIDs_sorted
def persons_combinations(json_files_framef):
'''
Find all possible combinations of detected persons' ids.
Person's id when no person detected is set to -1.
INPUT:
- json_files_framef: list of strings
OUTPUT:
- personsIDs_comb: array, list of lists of int
'''
n_cams = len(json_files_framef)
# amount of persons detected for each cam
nb_persons_per_cam = []
for c in range(n_cams):
with open(json_files_framef[c], 'r') as js:
nb_persons_per_cam += [len(json.load(js)['people'])]
# persons_combinations
id_no_detect = [i for i, x in enumerate(nb_persons_per_cam) if x == 0] # ids of cameras that have not detected any person
nb_persons_per_cam = [x if x != 0 else 1 for x in nb_persons_per_cam] # temporarily replace persons count by 1 when no detection
range_persons_per_cam = [range(nb_persons_per_cam[c]) for c in range(n_cams)]
personsIDs_comb = np.array(list(it.product(*range_persons_per_cam)), float) # all possible combinations of persons' ids
personsIDs_comb[:,id_no_detect] = np.nan # -1 = persons' ids when no person detected
return personsIDs_comb
def best_persons_and_cameras_combination(config, json_files_framef, personsIDs_combinations, projection_matrices, tracked_keypoint_id, calib_params):
'''
- if single_person: Choose the right person among the multiple ones found by
OpenPose & excludes cameras with wrong 2d-pose estimation.
- else: Choose all the combination of cameras that give a reprojection error below a threshold
1. triangulate the tracked keypoint for all possible combinations of people,
2. compute difference between reprojection & original openpose detection,
3. take combination with smallest error OR all those below the error threshold
If error is too big, take off one or several of the cameras until err is
lower than "max_err_px".
INPUTS:
- a Config.toml file
- json_files_framef: list of strings
- personsIDs_combinations: array, list of lists of int
- projection_matrices: list of arrays
- tracked_keypoint_id: int
OUTPUTS:
- errors_below_thresh: list of float
- comb_errors_below_thresh: list of arrays of ints
'''
single_person = config.get('project').get('single_person')
error_threshold_tracking = config.get('personAssociation').get('reproj_error_threshold_association')
likelihood_threshold = config.get('personAssociation').get('likelihood_threshold_association')
min_cameras_for_triangulation = config.get('triangulation').get('min_cameras_for_triangulation')
undistort_points = config.get('triangulation').get('undistort_points')
n_cams = len(json_files_framef)
error_min = np.inf
nb_cams_off = 0 # cameras will be taken-off until the reprojection error is under threshold
errors_below_thresh = []
comb_errors_below_thresh = []
Q_kpt = []
while error_min > error_threshold_tracking and n_cams - nb_cams_off >= min_cameras_for_triangulation:
# Try all persons combinations
for combination in personsIDs_combinations:
# Get x,y,likelihood values from files
x_files, y_files,likelihood_files = [], [], []
for index_cam, person_nb in enumerate(combination):
with open(json_files_framef[index_cam], 'r') as json_f:
js = json.load(json_f)
try:
x_files.append( js['people'][int(person_nb)]['pose_keypoints_2d'][tracked_keypoint_id*3] )
y_files.append( js['people'][int(person_nb)]['pose_keypoints_2d'][tracked_keypoint_id*3+1] )
likelihood_files.append( js['people'][int(person_nb)]['pose_keypoints_2d'][tracked_keypoint_id*3+2] )
except:
x_files.append(np.nan)
y_files.append(np.nan)
likelihood_files.append(np.nan)
# undistort points
if undistort_points:
points = np.array(tuple(zip(x_files,y_files))).reshape(-1, 1, 2).astype('float32')
undistorted_points = [cv2.undistortPoints(points[i], calib_params['K'][i], calib_params['dist'][i], None, calib_params['optim_K'][i]) for i in range(n_cams)]
x_files = np.array([[u[i][0][0] for i in range(len(u))] for u in undistorted_points]).squeeze()
y_files = np.array([[u[i][0][1] for i in range(len(u))] for u in undistorted_points]).squeeze()
# Replace likelihood by 0. if under likelihood_threshold
likelihood_files = [0. if lik < likelihood_threshold else lik for lik in likelihood_files]
# For each persons combination, create subsets with "nb_cams_off" cameras excluded
id_cams_off = list(it.combinations(range(len(combination)), nb_cams_off))
combinations_with_cams_off = np.array([combination.copy()]*len(id_cams_off))
for i, id in enumerate(id_cams_off):
combinations_with_cams_off[i,id] = np.nan
# Try all subsets
error_comb = []
Q_comb = []
for comb in combinations_with_cams_off:
# Filter x, y, likelihood, projection_matrices, with subset
x_files_filt = [x_files[i] for i in range(len(comb)) if not np.isnan(comb[i])]
y_files_filt = [y_files[i] for i in range(len(comb)) if not np.isnan(comb[i])]
likelihood_files_filt = [likelihood_files[i] for i in range(len(comb)) if not np.isnan(comb[i])]
projection_matrices_filt = [projection_matrices[i] for i in range(len(comb)) if not np.isnan(comb[i])]
if undistort_points:
calib_params_R_filt = [calib_params['R'][i] for i in range(len(comb)) if not np.isnan(comb[i])]
calib_params_T_filt = [calib_params['T'][i] for i in range(len(comb)) if not np.isnan(comb[i])]
calib_params_K_filt = [calib_params['K'][i] for i in range(len(comb)) if not np.isnan(comb[i])]
calib_params_dist_filt = [calib_params['dist'][i] for i in range(len(comb)) if not np.isnan(comb[i])]
# Triangulate 2D points
Q_comb.append(weighted_triangulation(projection_matrices_filt, x_files_filt, y_files_filt, likelihood_files_filt))
# Reprojection
if undistort_points:
coords_2D_kpt_calc_filt = [cv2.projectPoints(np.array(Q_comb[-1][:-1]), calib_params_R_filt[i], calib_params_T_filt[i], calib_params_K_filt[i], calib_params_dist_filt[i])[0] for i in range(n_cams-nb_cams_off)]
x_calc = [coords_2D_kpt_calc_filt[i][0,0,0] for i in range(n_cams-nb_cams_off)]
y_calc = [coords_2D_kpt_calc_filt[i][0,0,1] for i in range(n_cams-nb_cams_off)]
else:
x_calc, y_calc = reprojection(projection_matrices_filt, Q_comb[-1])
# Reprojection error
error_comb_per_cam = []
for cam in range(len(x_calc)):
q_file = (x_files_filt[cam], y_files_filt[cam])
q_calc = (x_calc[cam], y_calc[cam])
error_comb_per_cam.append( euclidean_distance(q_file, q_calc) )
error_comb.append( np.mean(error_comb_per_cam) )
if single_person:
error_min = np.nanmin(error_comb)
errors_below_thresh = [error_min]
comb_errors_below_thresh = [combinations_with_cams_off[np.argmin(error_comb)]]
Q_kpt = [Q_comb[np.argmin(error_comb)]]
if errors_below_thresh[0] < error_threshold_tracking:
break
else:
errors_below_thresh += [e for e in error_comb if e<error_threshold_tracking]
comb_errors_below_thresh += [combinations_with_cams_off[error_comb.index(e)] for e in error_comb if e<error_threshold_tracking]
Q_kpt += [Q_comb[error_comb.index(e)] for e in error_comb if e<error_threshold_tracking]
# print('\n', personsIDs_combinations)
# print(errors_below_thresh)
# print(comb_errors_below_thresh)
# print(Q_kpt)
if not single_person:
# Remove indices already used for a person
personsIDs_combinations = np.array([personsIDs_combinations[i] for i in range(len(personsIDs_combinations))
if not np.array(
[personsIDs_combinations[i,j]==comb[j] for comb in comb_errors_below_thresh for j in range(len(comb))]
).any()])
if len(personsIDs_combinations) < len(errors_below_thresh):
break
nb_cams_off += 1
return errors_below_thresh, comb_errors_below_thresh, Q_kpt
def recap_tracking(config, error, nb_cams_excluded):
'''
Print a message giving statistics on reprojection errors (in pixel and in m)
as well as the number of cameras that had to be excluded to reach threshold
conditions. Also stored in User/logs.txt.
INPUT:
- a Config.toml file
- error: dataframe
- nb_cams_excluded: dataframe
OUTPUT:
- Message in console
'''
# Read config
project_dir = config.get('project').get('project_dir')
session_dir = os.path.realpath(os.path.join(project_dir, '..', '..'))
tracked_keypoint = config.get('personAssociation').get('tracked_keypoint')
error_threshold_tracking = config.get('personAssociation').get('reproj_error_threshold_association')
poseTracked_dir = os.path.join(project_dir, 'pose-associated')
calib_dir = [os.path.join(session_dir, c) for c in os.listdir(session_dir) if ('Calib' or 'calib') in c][0]
calib_file = glob.glob(os.path.join(calib_dir, '*.toml'))[0] # lastly created calibration file
# Error
mean_error_px = np.around(np.mean(error), decimals=1)
calib = toml.load(calib_file)
calib_cam1 = calib[list(calib.keys())[0]]
fm = calib_cam1['matrix'][0][0]
Dm = euclidean_distance(calib_cam1['translation'], [0,0,0])
mean_error_mm = np.around(mean_error_px * Dm / fm * 1000, decimals=1)
# Excluded cameras
mean_cam_off_count = np.around(np.mean(nb_cams_excluded), decimals=2)
# Recap
logging.info(f'\n--> Mean reprojection error for {tracked_keypoint} point on all frames is {mean_error_px} px, which roughly corresponds to {mean_error_mm} mm. ')
logging.info(f'--> In average, {mean_cam_off_count} cameras had to be excluded to reach the demanded {error_threshold_tracking} px error threshold.')
logging.info(f'\nTracked json files are stored in {os.path.realpath(poseTracked_dir)}.')
def track_2d_all(config):
'''
For each frame,
- Find all possible combinations of detected persons
- Triangulate 'tracked_keypoint' for all combinations
- Reproject the point on all cameras
- Take combination with smallest reprojection error
- Write json file with only one detected person
Print recap message
INPUTS:
- a calibration file (.toml extension)
- json files from each camera folders with several detected persons
- a Config.toml file
- a skeleton model
OUTPUTS:
- json files for each camera with only one person of interest
'''
# Read config
project_dir = config.get('project').get('project_dir')
session_dir = os.path.realpath(os.path.join(project_dir, '..', '..'))
pose_model = config.get('pose').get('pose_model')
tracked_keypoint = config.get('personAssociation').get('tracked_keypoint')
frame_range = config.get('project').get('frame_range')
undistort_points = config.get('triangulation').get('undistort_points')
calib_dir = [os.path.join(session_dir, c) for c in os.listdir(session_dir) if ('Calib' or 'calib') in c][0]
calib_file = glob.glob(os.path.join(calib_dir, '*.toml'))[0] # lastly created calibration file
pose_dir = os.path.join(project_dir, 'pose')
poseTracked_dir = os.path.join(project_dir, 'pose-associated')
# projection matrix from toml calibration file
P = computeP(calib_file, undistort=undistort_points)
calib_params = retrieve_calib_params(calib_file)
# selection of tracked keypoint id
try: # from skeletons.py
model = eval(pose_model)
except:
try: # from Config.toml
model = DictImporter().import_(config.get('pose').get(pose_model))
if model.id == 'None':
model.id = None
except:
raise NameError('Model not found in skeletons.py nor in Config.toml')
tracked_keypoint_id = [node.id for _, _, node in RenderTree(model) if node.name==tracked_keypoint][0]
# 2d-pose files selection
pose_listdirs_names = next(os.walk(pose_dir))[1]
pose_listdirs_names = natural_sort(pose_listdirs_names)
json_dirs_names = [k for k in pose_listdirs_names if 'json' in k]
json_files_names = [fnmatch.filter(os.listdir(os.path.join(pose_dir, js_dir)), '*.json') for js_dir in json_dirs_names]
json_files_names = [natural_sort(j) for j in json_files_names]
json_files = [[os.path.join(pose_dir, j_dir, j_file) for j_file in json_files_names[j]] for j, j_dir in enumerate(json_dirs_names)]
# 2d-pose-associated files creation
if not os.path.exists(poseTracked_dir): os.mkdir(poseTracked_dir)
try: [os.mkdir(os.path.join(poseTracked_dir,k)) for k in json_dirs_names]
except: pass
json_tracked_files = [[os.path.join(poseTracked_dir, j_dir, j_file) for j_file in json_files_names[j]] for j, j_dir in enumerate(json_dirs_names)]
# person's tracking
json_files_flatten = [item for sublist in json_files for item in sublist]
nb_persons_to_detect = max([len(json.load(open(json_fname))['people']) for json_fname in json_files_flatten])
f_range = [[min([len(j) for j in json_files])] if frame_range==[] else frame_range][0]
n_cams = len(json_dirs_names)
error_min_tot, cameras_off_tot = [], []
# Check that camera number is consistent between calibration file and pose folders
if n_cams != len(P):
raise Exception(f'Error: The number of cameras is not consistent:\
Found {len(P)} cameras in the calibration file,\
and {n_cams} cameras based on the number of pose folders.')
Q_kpt = [np.array([0., 0., 0., 1.])] * nb_persons_to_detect
for f in tqdm(range(*f_range)):
# print(f'\nFrame {f}:')
json_files_f = [json_files[c][f] for c in range(n_cams)]
json_tracked_files_f = [json_tracked_files[c][f] for c in range(n_cams)]
# all possible combinations of persons
personsIDs_comb = persons_combinations(json_files_f)
# choose persons of interest and exclude cameras with bad pose estimation
Q_kpt_old = Q_kpt
errors_below_thresh, comb_errors_below_thresh, Q_kpt = best_persons_and_cameras_combination(config, json_files_f, personsIDs_comb, P, tracked_keypoint_id, calib_params)
# reID persons across frames by checking the distance from one frame to another
nb_persons_to_detect = max([len(Q_kpt_old), len(Q_kpt)])
Q_kpt, personsIDs_sorted = sort_people(Q_kpt_old, Q_kpt, nb_persons_to_detect)
errors_below_thresh = np.array(errors_below_thresh)[personsIDs_sorted]
comb_errors_below_thresh = np.array(comb_errors_below_thresh)[personsIDs_sorted]
# rewrite json files with a single or multiple persons of interest
error_min_tot.append(np.mean(errors_below_thresh))
cameras_off_count = np.count_nonzero([np.isnan(comb) for comb in comb_errors_below_thresh]) / len(comb_errors_below_thresh)
cameras_off_tot.append(cameras_off_count)
for cam in range(n_cams):
with open(json_tracked_files_f[cam], 'w') as json_tracked_f:
with open(json_files_f[cam], 'r') as json_f:
js = json.load(json_f)
js_new = js.copy()
js_new['people'] = []
for new_comb in comb_errors_below_thresh:
if not np.isnan(new_comb[cam]):
js_new['people'] += [js['people'][int(new_comb[cam])]]
else:
js_new['people'] += [{}]
json_tracked_f.write(json.dumps(js_new))
# recap message
recap_tracking(config, error_min_tot, cameras_off_tot)
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