我是opencv的初学者,我正在尝试在以下位置运行教程代码: http://docs.opencv.org/trunk/doc/py_tutorials/py_calib3d/py_table_of_contents_calib3d/py_table_of_contents_calib3d.html
我的代码和问题:
import scipy.io
import numpy as np
import cv2
import time
# data comes from calibration program same as tutorial
data=scipy.io.loadmat('distm.mat')
dist=data['dist000']
mtx=data['mtx']
data=None
#takes the corners in the chessboard
def draw(img, corners, imgpts):
corner = tuple(corners[0].ravel())
img = cv2.line(img, corner, tuple(imgpts[0].ravel()), (255,0,0), 5)
img = cv2.line(img, corner, tuple(imgpts[1].ravel()), (0,255,0), 5)
img = cv2.line(img, corner, tuple(imgpts[2].ravel()), (0,0,255), 5)
return img
criteria = (cv2.TERM_CRITERIA_EPS + cv2.TERM_CRITERIA_MAX_ITER, 30, 0.001)
objp = np.zeros((6*7,3), np.float32)
objp[:,:2] = np.mgrid[0:7,0:6].T.reshape(-1,2)
axis = np.float32([[3,0,0], [0,3,0], [0,0,-3]]).reshape(-1,3)
# cam open and wait a second to deny black or dark images
cap = cv2.VideoCapture(2)
ret, frame = cap.read()
print "Checking camera read:"+str(ret)
while ret ==False:
cap = cv2.VideoCapture(2)
ret, frame = cap.read()
time.sleep(1)
# takes live photos from camera
for i in range(0,20):
print i
ret, img = cap.read()
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
ret, corners = cv2.findChessboardCorners(gray, (7,6),None)
print ret
if ret == True:
corners2 = cv2.cornerSubPix(gray,corners,(11,11),(-1,-1),criteria)
# 'corners2' returns "none" and below codes not working so I use 'corners'
print corners2
# Find the rotation and translation vectors.
rvecs, tvecs, inliers = cv2.solvePnPRansac(objp, corners, mtx, dist)
# project 3D points to image plane
imgpts, jac = cv2.projectPoints(axis, rvecs, tvecs, mtx, dist)
img = draw(img,corners,imgpts) # img returns None
print img
cv2.imshow('pose',img) # error line
k = cv2.waitKey(0) & 0xff
,并在“cv2.imshow('pose',img)”处给出错误:
OpenCV Error: Assertion failed (size.width>0 && size.height>0) in
cv::imshow, file ..\..\..\modules\highgui\src\window.cpp, line 269
Traceback (most recent call last): File "<stdin>", line 1, in
<module> File
"C:\Python27\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py",
line 540, in runfile
execfile(filename, namespace) File "C:/Users/ACS/Documents/Python/Pose Estimation.py", line 49, in
<module>
cv2.imshow('pose',img) cv2.error: ..\..\..\modules\highgui\src\window.cpp:269: error: (-215)
size.width>0 && size.height>0 in function cv::imshow
感谢您的关注。
最佳答案
可能引起麻烦的一件事是,没有检查cap.read()
的成功情况:将ret
变量重新分配为新值,而无需第一次检查。
用另一个cap.read()
将if ret:
下面的代码包围起来可能会有所帮助。您会发现Python中不需要== True
关于python - Python姿势估计示例错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27282923/