![]() Use the C# Client Libraries as explained in this simple example, or use the complete documentation reference to have all the details about how to use this library ( Client Library documentation and ImageAnnotatorClient documentation).Refer to it in the GOOGLE_APPLICATION_CREDENTIALS environment variable in your machine.Download the JSON key for your Service Account.If you are using Service Accounts (I hope I convinced you to do so in the first part of my answer), you will need to follow these steps detailed in the documentation: In such a case, you will have to find a way to make HTTP requests in C#, parse the JSON response, etc. In this lesson, you will learn how to combine the two to make the most of their individual strengths and achieve even more accurate OCR results. If you are using API keys, it is as easy as as appending the API key to the REST API method that you want to call, just like this: OCR with Google Vision API and Tesseract Isabelle Gribomont Google Vision and Tesseract are both popular and powerful OCR tools, but they each have their weaknesses. So let's move on to the next topic, authenticating requests: I hope I have been able to highlight the differences between the alternative authentication methods available. API keys: you should follow a set of best practices for securely using them, and they cannot (or at least I am not aware of that) integrate with the Client Libraries therefore you will need to make calls to the REST API directly, which is more complex than using idiomatic Client Libraries.I strongly recommend you to use Service Accounts and idiomatic Client Libraries. Service Accounts: they are more secure, the recommended approach to use, and integrate well and easily with the APIs Client Libraries, which make your life much easier when it comes to interacting with GCP APIs. ![]() ![]() Here are the main differences that may be relevant for you regarding these two authentication methods: Production application, you should use service accounts, rather thanīeing this clarified, it is obviously up to you whether to use API keys (I understand this is what you refer to when you mention "subscription keys") or Service Accounts. Bear in mind that, as documented in the best practices for authentication in the Google Cloud Platform:įor almost all cases, whether you are developing locally or in a I think the question is a bit messed up, so let me take a step back and try to cover the most important things regarding authentication when using the Cloud Vision API.įirst of all, the documentation offers a really clear explanation on how to authenticate to the Cloud Vision API, using API keys or Service Accounts. ![]()
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