python opencv的imread方法无法读取图片问题

path = r"D:\Learn4Python\中文路径\中文文件名.jpg"
dat = np.fromfile(path,dtype=np.uint8)
img = cv2.imdecode(dat,cv2.IMREAD_UNCHANGED)

path_zh_write = r"D:\Learn4Python\中文路径\中文文件名写入图像.jpg"
out = cv2.imencode(".jpg",img)
out[1].tofile(path_zh_write)

import cv2
import numpy as np
#试验四种情况：路径无中文、仅文件名中文、目录和文件名均有中文、仅目录有中文
path1 = r"D:\Learn4Python\EnglishFileName.jpg"
path2 = r"D:\Learn4Python\中文文件名.jpg"
path3 = r"D:\Learn4Python\中文路径\中文文件名.jpg"
path4 = r"D:\Learn4Python\中文路径\EnglishFileName.jpg"
path_zh_write = r"D:\Learn4Python\中文路径\中文文件名写入图像.jpg"
path_en_write = r"D:\Learn4Python\EnglishFileName_writeImg.jpg"
img1 = cv2.imread(r"D:\Learn4Python\EnglishFileName.jpg")
img2 = cv2.imread(r"D:\Learn4Python\中文文件名.jpg")
img3 = cv2.imread(r"D:\Learn4Python\中文路径\中文文件名.jpg")
img4 = cv2.imread(r"D:\Learn4Python\中文路径\EnglishFileName.jpg")
#检查读取情况，结果只有路径无中文的情况读取成功
if img1 is None:
    print("img1 imread failed.")
else:
    print("img1 imread ok:",img1.shape)
if img2 is None:
    print("img2 imread failed.")
else:
    print("img2 imread ok:",img2.shape)
if img3 is None:
    print("img3 imread failed.")
else:
    print("img3 imread ok:",img3.shape)
if img4 is None:
    print("img4 imread failed.")
else:
    print("img4 imread ok:",img4.shape)
#借助numpy读取图像
dat1 = np.fromfile(path1,dtype=np.uint8)
img_d1 = cv2.imdecode(dat1,cv2.IMREAD_UNCHANGED)
dat2 = np.fromfile(path2,dtype=np.uint8)
img_d2 = cv2.imdecode(dat2,cv2.IMREAD_UNCHANGED)
dat3 = np.fromfile(path3,dtype=np.uint8)
img_d3 = cv2.imdecode(dat3,cv2.IMREAD_UNCHANGED)
dat4 = np.fromfile(path4,dtype=np.uint8)
img_d4 = cv2.imdecode(dat4,cv2.IMREAD_UNCHANGED)
#结果全部读取成功
if img_d1 is None:
    print("img_d1 imdecode failed.")
else:
    print("img_d1 imdecode ok:",img_d1.shape)
if img_d2 is None:
    print("img_d2 imdecode failed.")
else:
    print("img_d2 imdecode ok:",img_d2.shape)
if img_d3 is None:
    print("img_d3 imdecode failed.")
else:
    print("img_d3 imdecode ok:",img_d3.shape)
if img_d4 is None:
    print("img_d4 imdecode failed.")
else:
    print("img_d4 imdecode ok:",img_d4.shape)
#尝试用imwrite将图像写入文件，
#结果：无中文的路径写入成功，含中文的路径写入失败
if cv2.imwrite(path_en_write,img1):
    print("english path writing is ok!(use imwrite)")
else:
    print("english path writing is failed.(use imwrite)")
if cv2.imwrite(path_zh_write,img1):
    print("chinese path writing is ok!(use imwrite)")
else:
    print("chinese path writing is failed.(use imwrite)")
#借助numpy将图像写入含中文路径的文件，结果成功
out = cv2.imencode(".jpg",img1)
out[1].tofile(path_zh_write)
try:
    f = open(path_zh_write)
    f.close()
    print("chinese path writing is ok!(use imencode and tofile)")
except:
    print("chinese path writing is failed.(use imencode and tofile)")