我是图像处理的新手,我需要使用python + opencv来校准我的Sony RX1相机(照片尺寸7952 * 5304像素)。
问题是,如果我不使用以下命令调整棋盘照片的大小
img = cv2.resize(img, (int(h / 4), int(w / 4))
,
interpolation=cv2.INTER_AREA)
或
缩小照片
findChessboardCorners
在某些照片中找不到角,当我调整照片大小时,一切都很好。
我想知道它是怎么来的?
这是我的相机校准代码(python 3.6 + opencv 3.4和pycharm作为IDE)
criteria = (cv2.TERM_CRITERIA_EPS + cv2.TermCriteria_MAX_ITER, 30, 0.001)
pattern_size = (9, 6)
objp = np.zeros((6 * 9, 3), np.float32)
objp[:, :2] = np.mgrid[0:9, 0:6].T.reshape(-1, 2)
objpoints = []
imgpoints = []
# get all image filepaths
images = glob.glob(filename + '/*')
h, w = cv2.imread(images[0]).shape[:2]
for fname in images:
img = cv2.imread(fname)
print('load image \n', fname)
# img = cv2.resize(img, (int(h / 4), int(w / 4)),
interpolation=cv2.INTER_AREA)
if img is None:
print("Failed to load", filename)
return None
if img.ndim == 3:
gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
else:
gray = img
ret, corners = cv2.findChessboardCorners(gray, pattern_size,
cv2.CALIB_CB_ADAPTIVE_THRESH +
cv2.CALIB_CB_FAST_CHECK +
cv2.CALIB_CB_NORMALIZE_IMAGE)
if ret:
objpoints.append(objp)
corners2 = cv2.cornerSubPix(gray, corners, (5, 5), (-1, -1),
criteria)
imgpoints.append(corners2)
else:
print('chessboard not found')
return None
ret, camera_matrix, dist, rvecs, tvecs = cv2.calibrateCamera(objpoints,
imgpoints, (h, w), None, None)