Google Vision API label detection not working error: 'str' object has no attribute before request

Question

我正在尝试使用 Google Vision API 来读取图像的标签。

我正在 Google Compute Engine 实例上执行此操作，可以访问所有 Cloud API。我正在使用服务帐户进行身份验证

我不断收到以下错误

这是我正在执行的代码

import io
#from google.cloud import storage
#from google.cloud.vision_v1 import ImageAnnotatorClient
from google.oauth2 import service_account
# using old version of API

from google.cloud import vision
from google.cloud.vision import types


image_client = vision.ImageAnnotatorClient(credentials='credentials.json')


with io.open('/home/username/instagram-ml/userbucket/images/test_image.jpg','rb') as image_file:
    content = image_file.read()

image = types.Image(content=content)
#
image_response = image_client.label_detection(image =image)

labels = image_response.label_annotations

直到第

行

image_response = image_client.label_detection(image =image)

一切正常，我没有遇到身份验证问题。但是当我执行上面的行时，我突然得到这个错误。

几乎按照此 page

上的说明进行操作

不太确定哪里出了问题

Answer 1

您向客户端提供一个字符串（文件名？）作为凭据，但在 docs, the credential argument, if passed, should be an instance of Credentials 或其子类之一中指定。

Answer 2

要确定错误，请在设置凭据之前将以下行添加到您的代码中：

print('Credendtials from environ: {}'.format(os.environ.get('GOOGLE_APPLICATION_CREDENTIALS')))

如果输出是 Credendtials from environ: None，则脚本在设置了 GOOGLE_APPLICATION_CREDENTIALS 环境变量的上下文中不是运行。

要解决这个问题，首先确保您创建了服务帐户私钥。可以在链接 https://google-auth.readthedocs.io/en/latest/user-guide.html#service-account-private-key-files and Guideline on Setup

中找到创建服务帐户的步骤

当您创建服务帐户和密钥时，json 文件将自动下载。复制此文件的位置，例如：'C:/awesome-credentials.json'.

接下来安装以下库：

pip 安装google-cloud-vision
pip 安装google-云
pip install --upgrade google-api-python-client
pip install --upgrade google-auth

然后，使用以下代码在脚本中设置凭据：

from google.oauth2 import service_account

credentials = service_account.Credentials.from_service_account_file('C:/awesome-credentials.json')
client = vision.ImageAnnotatorClient(credentials=credentials)

这是整个代码的示例：

from google.cloud import vision
import io
import os
from google.oauth2 import service_account


def detect_text(path):
    """Detects text in the file."""
    credentials = service_account.Credentials.from_service_account_file('C:/awesome-credential.json')

    print('Credendtials from environ: {}'.format(os.environ.get('GOOGLE_APPLICATION_CREDENTIALS')))
    client = vision.ImageAnnotatorClient(credentials=credentials)

    with io.open(path, 'rb') as image_file:
        content = image_file.read()

    image = vision.types.Image(content=content)

    response = client.text_detection(image=image)
    texts = response.text_annotations
    print('Texts:')

    for text in texts:
        print('\n"{}"'.format(text.description))

        vertices = (['({},{})'.format(vertex.x, vertex.y)
                    for vertex in text.bounding_poly.vertices])

        print('bounds: {}'.format(','.join(vertices)))

Google Vision API label detection not working error: 'str' object has no attribute before request

Google Vision API label detection not working error: 'str' object has no attribute before request

python

google-cloud-platform

google-cloud-vision