Azure Computer Vision Resource not found when called using the SDK or accessed via the browser.

Javi Guarin 20

I created an Azure Computer Vision resource to explore its features. I'll be using it inside a mobile app and make use of the ImageAnalysis SDK: https://www.nuget.org/packages/Azure.AI.Vision.ImageAnalysis/1.0.0-beta.3.

After I created the resource, I noticed the SDK throws me an error saying: "(hostname nor servname provided, or not known (<vision-resource-name>.cognitiveservices.azure.com:443))".

I noticed that when I try to access the url directly from the browser it shows a json message:

{

"error": {

    "code": "404",

    "message": "Resource not found"

}

}

is there anything else that needs to be setup when creating an (Azure) Computer Vision resource?

how can I use it in the ImageAnalysis SDK?

navba-MSFT 23,625 Microsoft Employee

@Javi Guarin Welcome to Microsoft Q&A Forum, Thank you for posting your query here! .

Firstly, directly testing / browsing the endpoint URL from browser is not a valid test.

Ensure that the endpoint and the keys are entered correctly in your code. I used the same sample from the article, and it worked fine. I got a 200 success status code.

I am pasting my sample code here for your reference:

Image Analysis Caption


 string endpoint = "https://MyVisionName.cognitiveservices.azure.com/";
 string key = "337e4XXXXXXXXXXXX633cd7f";

 // Create an Image Analysis client.
 ImageAnalysisClient client = new ImageAnalysisClient(new Uri(endpoint), new AzureKeyCredential(key));

 // Use a file stream to pass the image data to the analyze call
 FileStream stream = new FileStream("image-analysis-sample.jpg", FileMode.Open);

 // Get a caption for the image.
 ImageAnalysisResult result = client.Analyze(
     BinaryData.FromStream(stream),
     VisualFeatures.Caption,
     new ImageAnalysisOptions { GenderNeutralCaption = true });

 // Print caption results to the console
 Console.WriteLine($"Image analysis results:");
 Console.WriteLine($" Caption:");
 Console.WriteLine($"   '{result.Caption.Text}', Confidence {result.Caption.Confidence:F4}");

Extracting text from image uploaded

 string endpoint = "https://MyVisionName.cognitiveservices.azure.com/";
 string key = "337e4XXXXXXXXXXXX633cd7f";

 // Create an Image Analysis client.
 ImageAnalysisClient client = new ImageAnalysisClient(new Uri(endpoint), new AzureKeyCredential(key));

      FileStream stream = new FileStream("image-analysis-sample1.jpg", FileMode.Open);

      // Extract text (OCR) from an image stream.
      ImageAnalysisResult result = client.Analyze(
          BinaryData.FromStream(stream),
          VisualFeatures.Read);

      // Print text (OCR) analysis results to the console
      Console.WriteLine("Image analysis results:");
      Console.WriteLine(" Read:");

      foreach (DetectedTextBlock block in result.Read.Blocks)
          foreach (DetectedTextLine line in block.Lines)
          {
              Console.WriteLine($"   Line: '{line.Text}', Bounding Polygon: [{string.Join(" ", line.BoundingPolygon)}]");
              foreach (DetectedTextWord word in line.Words)
              {
                  Console.WriteLine($"     Word: '{word.Text}', Confidence {word.Confidence.ToString("#.####")}, Bounding Polygon: [{string.Join(" ", word.BoundingPolygon)}]");
              }
          }
      Console.ReadLine();
  }

Hope this helps. If you have any follow-up questions, please let me know. I would be happy to help.

navba-MSFT 23,625 Reputation points Microsoft Employee

2024-08-16T07:44:42.1733333+00:00

@Javi Guarin Just following up to check if my suggestion helped. Please let me know if you have any further queries. I would be happy to help.
Javi Guarin 20 Reputation points

2024-08-20T04:54:41.1033333+00:00

hi Navba, sorry for the late response. I was under the impression the Computer Vision requires an additional resource running before it would work. Additionally the emulator that I used didn't have a proper internet connection, apologies for that user error.

I could now connect to the resource without issues except that I keep getting 400 bad request response.
navba-MSFT 23,625 Reputation points Microsoft Employee

2024-08-20T05:35:12.11+00:00
@Javi Guarin Thanks for getting back.

.

Questions:

Could you please share your use case?

What feature of Computer Vision are you using? Is it to extract text from image? Get a caption? Identify image etc ?

Did you use my above sample code ?

If not, Please share your sample code here.

Also share the detailed error message of the HTTP 400 error.

Awaiting your reply.
Javi Guarin 20 Reputation points

2024-08-20T08:55:40.79+00:00

I'm using computer vision to extract text from an image. I used the sample code based of the nuget C# sdk: https://www.nuget.org/packages/Azure.AI.Vision.ImageAnalysis.

The error message I'm getting says: "The image size is not allowed to be zero or larger than 20971520 bytes". although I can confirm an image is generated I'm looking whether there's a way to see in the azure resource if what kind of request was received by the computer vision resource.
Javi Guarin 20 Reputation points

2024-08-20T09:01:05.8733333+00:00

I'm using computer vision to extract text from an image. I've used the sample code attached on the C# SDK: https://www.nuget.org/packages/Azure.AI.Vision.ImageAnalysis
I did however had to add other changes on top as the image would come from Android's Image Analyzer.

When I pass the image to the SDK's ImageAnalysisClient.Analyze I always get an error: The image size is not allowed to be zero or larger than 20971520 bytes.
navba-MSFT 23,625 Reputation points Microsoft Employee

2024-08-20T09:50:48.1066667+00:00
@Javi Guarin Thanks for your reply.

The service is throwing an error because my image file is too large. How can I work around this?

The file size limit for most Azure AI Vision features is 4 MB for the 3.2 version of the API and 20MB for the 4.0 version, and the client library SDKs can handle files up to 6 MB. For more information, see the Image Analysis input limits.

.

If you want to preview the image before sending it to Azure Computer Vision to ensure it meets all the requirements. Here are a few steps you can follow:

Convert ImageProxy to Bitmap: First, convert the ImageProxy from CameraX to a Bitmap.

Display the Bitmap: Use an ImageView in your Android app to display the Bitmap.

Here’s a sample code snippet to help you with this:

// Convert ImageProxy to Bitmap private Bitmap ImageProxyToBitmap(ImageProxy image) { var planes = image.GetPlanes(); var buffer = planes[0].Buffer; byte[] bytes = new byte[buffer.Remaining()]; buffer.Get(bytes); return BitmapFactory.DecodeByteArray(bytes, 0, bytes.Length); } // Display the Bitmap in an ImageView private void DisplayImage(Bitmap bitmap) { ImageView imageView = FindViewById<ImageView>(Resource.Id.imageView); imageView.SetImageBitmap(bitmap); } // Usage in ImageAnalysis.Analyzer public void Analyze(ImageProxy image) { Bitmap bitmap = ImageProxyToBitmap(image); DisplayImage(bitmap); // Further processing... image.Close(); }

This code will help you convert the ImageProxy to a Bitmap and display it in an ImageView for preview before sending it to Azure Computer Vision.
Javi Guarin 20 Reputation points

2024-08-20T15:29:14.2533333+00:00

What if I want to pass the image from image proxy?

navba-MSFT 23,625 Microsoft Employee

@Javi Guarin If you want to pass the image directly from ImageProxy to Azure Computer Vision, you’ll need to convert the ImageProxy to a format that Azure Computer Vision can accept, such as a byte array. Here’s how you can do it:

Convert ImageProxy to Byte Array: Extract the image data from ImageProxy and convert it to a byte array.
Send Byte Array to Azure Computer Vision: Use the Azure SDK to send the byte array to the Computer Vision API.

Here is the sample code:

// Convert ImageProxy to Byte Array

private byte[] ImageProxyToByteArray(ImageProxy image)

{

    var planes = image.GetPlanes();

    var buffer = planes.Buffer;

    byte[] bytes = new byte[buffer.Remaining()];

    buffer.Get(bytes);

    return bytes;

}

// Send Byte Array to Azure Computer Vision

private async Task AnalyzeImageAsync(byte[] imageBytes)

{

    var client = new ComputerVisionClient(new ApiKeyServiceClientCredentials("YOUR_API_KEY"))

    {

        Endpoint = "YOUR_ENDPOINT"

    };

    using (var stream = new MemoryStream(imageBytes))

    {

        var features = new List<VisualFeatureTypes?> { VisualFeatureTypes.Description };

        var analysis = await client.AnalyzeImageInStreamAsync(stream, features);

        // Process the analysis results

    }

}

// Usage in ImageAnalysis.Analyzer

public async void Analyze(ImageProxy image)

{

    byte[] imageBytes = ImageProxyToByteArray(image);

    await AnalyzeImageAsync(imageBytes);

    image.Close();

}

Hope this answers.

navba-MSFT 23,625 Reputation points Microsoft Employee

2024-08-22T07:25:40.1766667+00:00

@Javi Guarin Just following up to check if my suggestion helped. Please let me know if you have any further queries. I would be happy to help.

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Azure Computer Vision Resource not found when called using the SDK or accessed via the browser.

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