如何使用Google Cloud OCR进行图像到文本识别

Question

I will highly appreciate if we can set up here a step by step working example of how to use Google Cloud API services for image to text OCR recognition. I want to get a text from an image. As far as I read: 1. You need to set up credentials to use this API which I did it and as result I had to download a file (I hided the real keys & private_key):

{
  "type": "service_account",
  "project_id": "carcheck-login",
  "private_key_id": "replace with yours",
  "private_key": "-----BEGIN PRIVATE KEY-----replace with yours
-----END PRIVATE KEY-----
",
  "client_email": "[e-mail]",
  "client_id": "replace with yours",
  "auth_uri": "https://accounts.google.com/o/oauth2/auth",
  "token_uri": "https://oauth2.googleapis.com/token",
  "auth_provider_x509_cert_url": "https://www.googleapis.com/oauth2/v1/certs",
  "client_x509_cert_url": "https://www.googleapis.com/robot/v1/metadata/x509/carcheck%40carcheck-login.iam.gserviceaccount.com"
}

But from here what is next? How do I include the php or JS library and where I download it?

I found some functions and sample how to read image here: https://cloud.google.com/vision/docs/detecting-text#vision-text-detection-php but it is now clear how to use these first 2 lines:

namespace Google\Cloud\Samples\Vision;

use Google\Cloud\Vision\V1\ImageAnnotatorClient;

and where to download their libraries..

Please help to add the missing part so this can be used as a working example

Thanks for your time