Google App Engine: image to base64 String for OCR (Python)

Question

我在Google App Engine中有以下代码，它接受来自用户的图像，然后对该图像执行OCR。

索引.html：

<form action="/submit" method="post" enctype="multipart/form-data">
    <input type="file" name="newImage" capture="camera">
    <input type="submit" value="Submit">
</form>

main.py：

import requests
def image_to_text(encoded_string, content_type="jpeg"):
    api_key = "API_KEY"
    overlay = False  
    language = 'eng'
    payload = {'isOverlayRequired': overlay,
           'apikey': api_key,
           'language': language,
           'base64Image': "data:image/{};base64,{}".format(content_type,
                                                           encoded_string)
           }
    r = requests.post('https://api.ocr.space/parse/image',
                  data=payload)
    return r.content.decode() 

class Submit(webapp2.RequestHandler):
    def post(self):
        new_image = self.request.get("newImage")
        if new_image is not '': # ie user uploads an image
            IMG = UploadImage()
            IMG.img = new_image # ndb.BlobProperty()
            img_key = IMG.put() # stores it in datastore
            img_key_url = img_key.urlsafe()
            base64_string = new_image.encode('base64') # this is the step that I may be doing wrongly
            text= image_to_text(base64_string) 

但是，我收到一个错误，指出它不是有效的base64图像。

以下代码(用于读取图像并将其转换为 base64 字符串(在我从本地磁盘读取文件时有效。(我正在使用的 OCR API 可以在这里找到：https://ocr.space/ocrapi#python

OCR.py：

import requests
import base64
def image_to_text(base64_encoded_string=None,content_type="jpeg"):
    filename = 'image.jpg'
    with open(filename, 'rb') as f:
        encoded_string = base64.b64encode(f.read()).strip('n')
        api_key = "API_KEY"
        overlay = False # Boolean value indicating if the overlay is required along with the image/pdf parsed result
        language = 'eng'
        payload = {'isOverlayRequired': overlay,
            'apikey': api_key,
            'language': language,
           'base64Image':"data:image/{};base64,{}".format(content_type,
                                                            encoded_string)
            }

    r = requests.post('https://api.ocr.space/parse/image',
                        data=payload)
    return r.content.decode()

任何帮助将不胜感激。谢谢！

Answer 1

哦，

等等，我通过这样做自己解决了它：

encoded_string = base64.b64encode(image).strip('n')