Question

我想使用Python和Flask发送和接收图像。我当前的解决方案不起作用。

from flask import Flask, render_template, request
import pandas as pd
import cv2
import numpy as np
import base64

app = Flask(__name__)

@app.route('/add_face', methods=['GET', 'POST'])
def add_face():
    if request.method == 'POST':
        #  read encoded image
        imageString = base64.b64decode(request.form['img'])
        #  convert binary data to numpy array
        nparr = np.fromstring(imageString, np.uint8)
        #  let opencv decode image to correct format
        img = cv2.imdecode(nparr, cv2.IMREAD_ANYCOLOR);
        cv2.imshow("frame", img)
        cv2.waitKey(0)

    return "list of names & faces"

if __name__ == '__main__':
    app.run(debug=True, port=5000)

客户端：

import requests
import base64

URL = "http://localhost:5000/add_face"

#first, encode our image with base64
with open("block.png", "rb") as imageFile:
    img = base64.b64encode(imageFile.read())

response = requests.post(URL, data={"name":"obama", "img":str(img)})
print(response.content)

错误：

    return binascii.a2b_base64(s)\nbinascii.
Error: Incorrect padding\n\n-->\n'

Answer 1

我认为您没有在服务器上正确解析请求。另外，变量'imageString'实际上是二进制的，因为它是从发布请求中解码'img'字符串的结果

尝试更改

imageString = base64.b64decode(request.form['img'])

到

req = request.get_json(silent=True, force=True)
imageString = base64.b64decode(req.get('img'))

以字节为单位发送和接收图像

1 个答案: