二进制打开图片文件，base64编解码，转成Opencv格式：

# coding: utf-8

import base64

import numpy as np

import cv2

img_file = open(r'00.JPG','rb')   # 二进制打开图片文件

img_b64encode = base64.b64encode(img_file.read())  # base64编码

img_file.close()  # 文件关闭

img_b64decode = base64.b64decode(img_b64encode)  # base64解码

img_array = np.fromstring(img_b64decode,np.uint8) # 转换np序列

img=cv2.imdecode(img_array,cv2.COLOR_BGR2RGB)  # 转换Opencv格式

cv2.imshow("img",img)

cv2.waitKey()

二进制打开图片文件，base64编解码，转成PIL.Image格式：

# coding: utf-8

# python base64 编解码，转换成Opencv，PIL.Image图片格式

import base64

import io

from PIL import Image

img_file = open(r'/home/dcrmg/work/medi_ocr_v1.2/img/00.JPG','rb')   # 二进制打开图片文件

img_b64encode = base64.b64encode(img_file.read())  # base64编码

img_file.close()  # 文件关闭

img_b64decode = base64.b64decode(img_b64encode)  # base64解码

image = io.BytesIO(img_b64decode)

img = Image.open(image)

img.show()