如何使用python使用本地图像查询Google Cloud Vision API？

Question

我想使用本地存储的图像向Google视觉API发送请求。我遵循“ Python Client for Google Cloud Vision¶”指南，特别是“注释图像”下的代码示例。为了建立我的请求，我遵循“ Base64 Encoding”中的示例。

这是我写的代码：

from google.cloud.vision import ImageAnnotatorClient
import os
import base64
os.environ['GOOGLE_APPLICATION_CREDENTIALS'] = 'keys/sc_google.json'

def encode_image(image_path):
    with open(image_path, "rb") as f:
        image_content = f.read()
        return base64.b64encode(image_content)

client = ImageAnnotatorClient()
image_path = 'images/happy_baby3.png'
query = {
    "requests": [
        {
            "image": {
                "content": encode_image(image_path)
            },
            "features": [
                {
                    "type": "FACE_DETECTION",
                    "maxResults": 10
                }
            ]
        }
    ]
}
response = client.annotate_image(query)
print(response.annotations)

Stil wenn运行代码后，我收到以下错误消息：

Traceback (most recent call last):
  File "/mnt/c/Users/nomis/PycharmProjects/hello_web_app/emotion_detection.py", line 29, in <module>
    response = client.annotate_image(query)
  File "/usr/local/lib/python3.6/dist-packages/google/cloud/vision_helpers/__init__.py", line 55, in annotate_image
    image = protobuf.get(request, "image")
  File "/usr/local/lib/python3.6/dist-packages/google/api_core/protobuf_helpers.py", line 192, in get
    raise KeyError(key)
KeyError: 'image'

我也尝试过this Example，但收到错误消息“在'types.py'中找不到参考'图像'。

您能解释我做错了什么，并提供一个使用本地图像查询Google Vision API的基本示例吗？

Answer 1

在您链接的示例中，没有请求的数组。试试这个：

query = {
            "image": {
                "content": encode_image(image_path)
            },
            "features": [
                {
                    "type": "FACE_DETECTION",
                    "maxResults": 10
                }
            ]
}