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Python OpenCV solvePnP 转换为欧拉角

转载 作者:太空宇宙 更新时间:2023-11-03 22:18:17 32 4
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我正在像这样使用 solvePnP..

import cv2
import numpy as np

# Read Image
im = cv2.imread("headPose.jpg");
size = im.shape

#2D image points. If you change the image, you need to change vector
image_points = np.array([
(359, 391), # Nose tip
(399, 561), # Chin
(337, 297), # Left eye left corner
(513, 301), # Right eye right corne
(345, 465), # Left Mouth corner
(453, 469) # Right mouth corner
], dtype="double")

# 3D model points.
model_points = np.array([
(0.0, 0.0, 0.0), # Nose tip
(0.0, -330.0, -65.0), # Chin
(-225.0, 170.0, -135.0), # Left eye left corner
(225.0, 170.0, -135.0), # Right eye right corne
(-150.0, -150.0, -125.0), # Left Mouth corner
(150.0, -150.0, -125.0) # Right mouth corner

])


# Camera internals

focal_length = size[1]
center = (size[1]/2, size[0]/2)
camera_matrix = np.array(
[[focal_length, 0, center[0]],
[0, focal_length, center[1]],
[0, 0, 1]], dtype = "double"
)

print "Camera Matrix :\n {0}".format(camera_matrix)

dist_coeffs = np.zeros((4,1)) # Assuming no lens distortion
(success, rotation_vector, translation_vector) = cv2.solvePnP(model_points, image_points, camera_matrix, dist_coeffs, flags=cv2.CV_ITERATIVE)

print "Rotation Vector:\n {0}".format(rotation_vector)
print "Translation Vector:\n {0}".format(translation_vector)

我对旋转向量和平移向量到底是什么感到困惑?我想我需要将这些转换为欧拉角,以便为我提供 3 个值,用于俯仰、滚动和偏航。

这是正确的吗?有人有这方面的例子吗?

最佳答案

rvecs是旋转的轴角表示,通常需要4个数,[v,theta],但是v需要是单位向量,所以它的长度编码为theta,将需要的数减少到3个。

对于代码来说,应该是这样的

def pnp(objectPoints,imgPoints,w,h,f):
cameraMatrix = np.array([[f,0,w/2.0],
[0,f,h/2.0],
[0,0,1]])
distCoeffs = np.zeros((5,1))
revtval,rvecs, tvecs =cv2.solvePnP(objectPoints[:,np.newaxis,:], imgPoints[:,np.newaxis,:], cameraMatrix, distCoeffs)#,False,flags=cv2.SOLVEPNP_EPNP)
return rvecs,tvecs


def rot_params_rv(rvecs):
from math import pi,atan2,asin
R = cv2.Rodrigues(rvecs)[0]
roll = 180*atan2(-R[2][1], R[2][2])/pi
pitch = 180*asin(R[2][0])/pi
yaw = 180*atan2(-R[1][0], R[0][0])/pi
rot_params= [roll,pitch,yaw]
return rot_params

关于Python OpenCV solvePnP 转换为欧拉角,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54970421/

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