用以下方法代替
# python3版本
# imread
path_file = "sample"
img = cv2.imdecode(np.fromfile(path_file,dtype=np.uint8),-1)
#imwrite
_path = "sample"
cv2.imencode('.jpg',img)[1].tofile(_path)
# python 2版本
import cv2
import sys
reload(sys)
sys.setdefaultencoding('u8')
path_file = u"sample"
img = cv2.imread(path_file.decode('u8').encode('gbk'),-1)
