244 lines
8.2 KiB
Python
244 lines
8.2 KiB
Python
#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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'''
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##################################################
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## QCA CALIBRATION TO TOML CALIBRATION ##
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##################################################
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Convert a Qualisys .qca.txt calibration file
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to an OpenCV .toml calibration file
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Usage:
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from Pose2Sim.Utilities import calib_qca_to_toml; calib_qca_to_toml.calib_qca_to_toml_func(r'<input_qca_file>')
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OR python -m calib_qca_to_toml -i "<input_qca_file>"
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OR python -m calib_qca_to_toml -i "<input_qca_file>" --binning_factor 2 -o "<output_toml_file>"
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'''
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## INIT
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import os
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import argparse
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import re
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import numpy as np
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from lxml import etree
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import cv2
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## AUTHORSHIP INFORMATION
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__author__ = "David Pagnon"
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__copyright__ = "Copyright 2021, Pose2Sim"
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__credits__ = ["David Pagnon"]
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__license__ = "BSD 3-Clause License"
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__version__ = '0.4'
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__maintainer__ = "David Pagnon"
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__email__ = "contact@david-pagnon.com"
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__status__ = "Development"
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## FUNCTIONS
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def read_qca(qca_path, binning_factor):
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'''
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Read a Qualisys .qca.txt calibration file
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Returns 5 lists of size N (N=number of cameras):
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- ret: residual reprojection error in _mm_: list of floats
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- C (camera name),
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- S (image size),
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- D (distorsion),
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- K (intrinsic parameters),
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- R (extrinsic rotation),
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- T (extrinsic translation)
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'''
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root = etree.parse(qca_path).getroot()
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ret, C, S, D, K, R, T = [], [], [], [], [], [], []
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vid_id = []
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# Camera name
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for i, tag in enumerate(root.findall('cameras/camera')):
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ret += [float(tag.attrib.get('avg-residual'))/1000]
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C += [tag.attrib.get('serial')]
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if tag.attrib.get('model') in ('Miqus Video', 'Miqus Video UnderWater', 'none'):
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vid_id += [i]
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# Image size
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for tag in root.findall('cameras/camera/fov_video'):
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w = (float(tag.attrib.get('right')) - float(tag.attrib.get('left'))) /binning_factor
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h = (float(tag.attrib.get('bottom')) - float(tag.attrib.get('top'))) /binning_factor
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S += [[w, h]]
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# Intrinsic parameters: distorsion and intrinsic matrix
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for i, tag in enumerate(root.findall('cameras/camera/intrinsic')):
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k1 = float(tag.get('radialDistortion1'))/64/binning_factor
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k2 = float(tag.get('radialDistortion2'))/64/binning_factor
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p1 = float(tag.get('tangentalDistortion1'))/64/binning_factor
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p2 = float(tag.get('tangentalDistortion2'))/64/binning_factor
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D+= [np.array([k1, k2, p1, p2])]
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fu = float(tag.get('focalLengthU'))/64/binning_factor
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fv = float(tag.get('focalLengthV'))/64/binning_factor
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cu = float(tag.get('centerPointU'))/64/binning_factor \
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- float(root.findall('cameras/camera/fov_video')[i].attrib.get('left'))
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cv = float(tag.get('centerPointV'))/64/binning_factor \
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- float(root.findall('cameras/camera/fov_video')[i].attrib.get('top'))
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K += [np.array([fu, 0., cu, 0., fv, cv, 0., 0., 1.]).reshape(3,3)]
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# Extrinsic parameters: rotation matrix and translation vector
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for tag in root.findall('cameras/camera/transform'):
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tx = float(tag.get('x'))/1000
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ty = float(tag.get('y'))/1000
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tz = float(tag.get('z'))/1000
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r11 = float(tag.get('r11'))
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r12 = float(tag.get('r12'))
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r13 = float(tag.get('r13'))
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r21 = float(tag.get('r21'))
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r22 = float(tag.get('r22'))
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r23 = float(tag.get('r23'))
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r31 = float(tag.get('r31'))
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r32 = float(tag.get('r32'))
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r33 = float(tag.get('r33'))
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# Rotation (by-column to by-line)
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R += [np.array([r11, r21, r31, r12, r22, r32, r13, r23, r33]).reshape(3,3)]
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T += [np.array([tx, ty, tz])]
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# Cameras names by natural order
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C_vid = [C[v] for v in vid_id]
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C_vid_id = [C_vid.index(c) for c in natural_sort(C_vid)]
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C_id = [vid_id[c] for c in C_vid_id]
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C = [C[c] for c in C_id]
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ret = [ret[c] for c in C_id]
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S = [S[c] for c in C_id]
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D = [D[c] for c in C_id]
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K = [K[c] for c in C_id]
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R = [R[c] for c in C_id]
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T = [T[c] for c in C_id]
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return C, S, D, K, R, T
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def RT_qca2cv(r, t):
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'''
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Converts rotation R and translation T
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from Qualisys object centered perspective
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to OpenCV camera centered perspective
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and inversely.
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Qc = RQ+T --> Q = R-1.Qc - R-1.T
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'''
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r = r.T
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t = - r.dot(t)
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return r, t
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def rotate_cam(r, t, ang_x=np.pi, ang_y=0, ang_z=0):
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'''
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Apply rotations around x, y, z in cameras coordinates
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'''
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rt_h = np.block([[r,t.reshape(3,1)], [np.zeros(3), 1 ]])
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r_ax_x = np.array([1,0,0, 0,np.cos(ang_x),-np.sin(ang_x), 0,np.sin(ang_x),np.cos(ang_x)]).reshape(3,3)
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r_ax_y = np.array([np.cos(ang_y),0,np.sin(ang_y), 0,1,0, -np.sin(ang_y),0,np.cos(ang_y)]).reshape(3,3)
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r_ax_z = np.array([np.cos(ang_z),-np.sin(ang_z),0, np.sin(ang_z),np.cos(ang_z),0, 0,0,1]).reshape(3,3)
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r_ax = r_ax_z.dot(r_ax_y).dot(r_ax_x)
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r_ax_h = np.block([[r_ax,np.zeros(3).reshape(3,1)], [np.zeros(3), 1]])
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r_ax_h__rt_h = r_ax_h.dot(rt_h)
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r = r_ax_h__rt_h[:3,:3]
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t = r_ax_h__rt_h[:3,3]
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return r, t
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def natural_sort(list):
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'''
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Sorts list of strings with numbers in natural order
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Example: ['item_1', 'item_2', 'item_10']
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Taken from: https://stackoverflow.com/a/11150413/12196632
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'''
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convert = lambda text: int(text) if text.isdigit() else text.lower()
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alphanum_key = lambda key: [convert(c) for c in re.split('([0-9]+)', key)]
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return sorted(list, key=alphanum_key)
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def toml_write(toml_path, C, S, D, K, R, T):
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'''
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Writes calibration parameters to a .toml file.
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'''
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with open(os.path.join(toml_path), 'w+') as cal_f:
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for c in range(len(C)):
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cam=f'[cam_{c+1}]\n'
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name = f'name = "{C[c]}"\n'
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size = f'size = [ {S[c][0]}, {S[c][1]},]\n'
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mat = f'matrix = [ [ {K[c][0,0]}, 0.0, {K[c][0,2]},], [ 0.0, {K[c][1,1]}, {K[c][1,2]},], [ 0.0, 0.0, 1.0,],]\n'
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dist = f'distortions = [ {D[c][0]}, {D[c][1]}, {D[c][2]}, {D[c][3]},]\n'
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rot = f'rotation = [ {R[c][0]}, {R[c][1]}, {R[c][2]},]\n'
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tran = f'translation = [ {T[c][0]}, {T[c][1]}, {T[c][2]},]\n'
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fish = f'fisheye = false\n\n'
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cal_f.write(cam + name + size + mat + dist + rot + tran + fish)
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meta = '[metadata]\nadjusted = false\nerror = 0.0\n'
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cal_f.write(meta)
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def calib_qca_to_toml_func(*args):
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'''
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Convert a Qualisys .qca.txt calibration file
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to an OpenCV .toml calibration file
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Usage:
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import calib_qca_to_toml; calib_qca_to_toml.calib_qca_to_toml_func(r'<input_qca_file>')
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OR calib_qca_to_toml -i "<input_qca_file>"
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OR calib_qca_to_toml -i "<input_qca_file>" --binning_factor 2 -o "<output_toml_file>"
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'''
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try:
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qca_path = args[0].get('input_file') # invoked with argparse
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binning_factor = int(args[0]['binning_factor'])
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if args[0]['output_file'] == None:
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toml_path = qca_path.replace('.qca.txt', '.toml')
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else:
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toml_path = args[0]['output_file']
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except:
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qca_path = args[0] # invoked as a function
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toml_path = qca_path.replace('.qca.txt', '.toml')
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try:
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binning_factor = int(args[1])
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except:
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binning_factor = 1
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C, S, D, K, R, T = read_qca(qca_path, binning_factor)
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RT = [RT_qca2cv(r,t) for r, t in zip(R, T)]
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R = [rt[0] for rt in RT]
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T = [rt[1] for rt in RT]
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RT = [rotate_cam(r, t, ang_x=np.pi, ang_y=0, ang_z=0) for r, t in zip(R, T)]
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R = [rt[0] for rt in RT]
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T = [rt[1] for rt in RT]
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R = [np.array(cv2.Rodrigues(r)[0]).flatten() for r in R]
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T = np.array(T)/1000
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toml_write(toml_path, C, S, D, K, R, T)
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print('Calibration file generated.\n')
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if __name__ == '__main__':
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parser = argparse.ArgumentParser()
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parser.add_argument('-i', '--input_file', required = True, help='Qualisys .qca.txt input calibration file')
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parser.add_argument('-b', '--binning_factor', required = False, default = 1, help='Binning factor if applied')
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parser.add_argument('-o', '--output_file', required=False, help='OpenCV .toml output calibration file')
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args = vars(parser.parse_args())
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calib_qca_to_toml_func(args)
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