我正在为OpenCV 3校准相机。目前,我正在阅读教程和文档,遇到了问题。代码的末尾让我裁剪图像,以消除可见的失真(如下所示)
但是,当我尝试这样做时,有时会出现错误libpng warning: Image width is zero in IHDRlibpng warning: Image height is zero in IHDRlibpng error: Invalid IHDR data
它不会阻止程序运行,但是会保存没有像素的图像。我认为裁切功能正在裁切整个图像,并且这种情况发生的时间约为80%。
import numpy as np
import cv2
import glob
import time
thyme = ('1')
# termination criteria
criteria = (cv2.TERM_CRITERIA_EPS + cv2.TERM_CRITERIA_MAX_ITER, 30, 0.001)
# prepare object points, like (0,0,0), (1,0,0), (2,0,0) ....,(6,5,0)
objp = np.zeros((6*9,3), np.float32)
objp[:,:2] = np.mgrid[0:6,0:9].T.reshape(-1,2)
# Arrays to store object points and image points from all the images.
objpoints = [] # 3d point in real world space
imgpoints = [] # 2d points in image plane.
images = glob.glob('*.jpg')
for fname in images:
img = cv2.imread(fname)
gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
# Find the chess board corners
ret, corners = cv2.findChessboardCorners(gray, (6,9),None)
# If found, add object points, image points (after refining them)
if ret == True:
objpoints.append(objp)
ticks = time.time()
thyme = str(ticks)
corners2 = cv2.cornerSubPix(gray,corners,(11,11),(-1,-1),criteria)
imgpoints.append(corners2)
# Draw and display the corners
img = cv2.drawChessboardCorners(img, (6,9), corners2,ret)
ret, mtx, dist, rvecs, tvecs = cv2.calibrateCamera(objpoints, imgpoints, gray.shape[::-1],None,None)
img = cv2.imread('left1.jpg')
h, w = img.shape[:2]
newcameramtx, roi=cv2.getOptimalNewCameraMatrix(mtx,dist,(w,h),1,(w,h))
# undistort
dst = cv2.undistort(img, mtx, dist, None, newcameramtx)
# crop the image
x,y,w,h = roi
print('1')
dst = dst[y:y+h, x:x+w]
print('2')
cv2.imwrite('calibresult' + thyme + '.png',dst)
print('3')
cv2.imshow('img',img)
cv2.waitKey(500)
cv2.destroyAllWindows()
包括打印语句,以便我可以查看图像是否抛出错误或是否干净。
编辑:这是我的错误
12libpng warning: Image width is zero in IHDRlibpng warning: Image height is zero in IHDRlibpng error: Invalid IHDR data312libpng warning: Image width is zero in IHDRlibpng warning: Image height is zero in IHDRlibpng error: Invalid IHDR data312libpng warning: Image width is zero in IHDRlibpng warning: Image height is zero in IHDRlibpng error: Invalid IHDR data3
最佳答案
解决此问题的方法是在dist = np.array([-0.13615181, 0.53005398, 0, 0, 0]) # no translation
行下方添加ret, mtx, dist, rvecs, tvecs = cv2.calibrateCamera(objpoints, imgpoints, gray.shape[::-1],None,None)
关于python - OpenCV校准相机裁剪错误,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/34550238/