Detect multiple objects

Note: Cloud Vision now supports offline asynchronous batch image annotation for all features. This asynchronous request supports up to 2000 image files and returns response JSON files that are stored in your Google Cloud Storage bucket. For more information about this feature, refer to Offline batch image annotation.

The Cloud Vision API can detect and extract multiple objects in an image with Object Localization.

Object localization identifies multiple objects in an image and provides a LocalizedObjectAnnotation for each object in the image. Each LocalizedObjectAnnotation identifies information about the object, the position of the object, and rectangular bounds for the region of the image that contains the object.

Object localization identifies both significant and less-prominent objects in an image.

Object information is returned in English only. The Cloud Translation can translate English labels into any of a number of other languages.

Image credit: Bogdan Dada on Unsplash (annotations added).

For example, the API might return the following information and bounding location data for the objects in the image above:

Name	mid	Score	Bounds
Bicycle wheel	/m/01bqk0	0.89648587	(0.32076266, 0.78941387), (0.43812272, 0.78941387), (0.43812272, 0.97331065), (0.32076266, 0.97331065)
Bicycle	/m/0199g	0.886761	(0.312, 0.6616471), (0.638353, 0.6616471), (0.638353, 0.9705882), (0.312, 0.9705882)
Bicycle wheel	/m/01bqk0	0.6345275	(0.5125398, 0.760708), (0.6256646, 0.760708), (0.6256646, 0.94601655), (0.5125398, 0.94601655)
Picture frame	/m/06z37_	0.6207608	(0.79177403, 0.16160682), (0.97047985, 0.16160682), (0.97047985, 0.31348917), (0.79177403, 0.31348917)
Tire	/m/0h9mv	0.55886006	(0.32076266, 0.78941387), (0.43812272, 0.78941387), (0.43812272, 0.97331065), (0.32076266, 0.97331065)
Door	/m/02dgv	0.5160098	(0.77569866, 0.37104446), (0.9412425, 0.37104446), (0.9412425, 0.81507325), (0.77569866, 0.81507325)

mid contains a machine-generated identifier (MID) corresponding to a label's Google Knowledge Graph entry. For information on inspecting mid values, see the Google Knowledge Graph Search API documentation.

Object Localization requests

Set up your GCP project and authentication

If you have not created a Google Cloud Platform (GCP) project and service account credentials, do so now. Expand this section for instructions.

1. Sign in to your Google Account.

   If you don't already have one, sign up for a new account.

2. Set up a Cloud Console project.

   Set up a project

   Click to:

   • Create or select a project.
   • Enable the Cloud Vision API for that project.
   • Create a service account.
   • Download a private key as JSON.

   You can view and manage these resources at any time in the Cloud Console.

3. Set the environment variable GOOGLE_APPLICATION_CREDENTIALS to the file path of the JSON file that contains your service account key. This variable only applies to your current shell session, so if you open a new session, set the variable again.

   Example: Linux or macOS

   Replace [PATH] with the file path of the JSON file that contains your service account key.

   export GOOGLE_APPLICATION_CREDENTIALS="[PATH]"

   For example:

   export GOOGLE_APPLICATION_CREDENTIALS="/home/user/Downloads/service-account-file.json"

   Example: Windows

   Replace [PATH] with the file path of the JSON file that contains your service account key, and [FILE_NAME] with the filename.

   With PowerShell:

   $env:GOOGLE_APPLICATION_CREDENTIALS="[PATH]"

   For example:

   $env:GOOGLE_APPLICATION_CREDENTIALS="C:\Users\username\Downloads\[FILE_NAME].json"

   With command prompt:

   set GOOGLE_APPLICATION_CREDENTIALS=[PATH]

4. Install and initialize the Cloud SDK.

Detect objects in a local image

The Vision API can perform feature detection on a local image file by sending the contents of the image file as a base64 encoded string in the body of your request.

REST & CMD LINE

Before using any of the request data below, make the following replacements:

• base64-encoded-image: The base64 representation (ASCII string) of your binary image data. This string should look similar to the following string:
  • /9j/4QAYRXhpZgAA...9tAVx/zDQDlGxn//2Q==
  Visit the base64 encode topic for more information.

HTTP method and URL:

POST https://vision.googleapis.com/v1/images:annotate

Request JSON body:

{
  "requests": [
    {
      "image": {
        "content": "base64-encoded-image"
      },
      "features": [
        {
          "maxResults": 10,
          "type": "OBJECT_LOCALIZATION"
        },
      ]
    }
  ]
}

To send your request, choose one of these options:

curl

Note: If you are not executing the command below from Cloud Shell or Compute Engine, ensure you have set the GOOGLE_APPLICATION_CREDENTIALS environment variable to your service account private key file path.

Save the request body in a file called request.json, and execute the following command:

curl -X POST \
-H "Authorization: Bearer "$(gcloud auth application-default print-access-token) \
-H "Content-Type: application/json; charset=utf-8" \
-d @request.json \
https://vision.googleapis.com/v1/images:annotate

PowerShell

Note: If you are not executing the command below from Cloud Shell or Compute Engine, ensure you have set the GOOGLE_APPLICATION_CREDENTIALS environment variable to your service account private key file path.

Save the request body in a file called request.json, and execute the following command:

$cred = gcloud auth application-default print-access-token
$headers = @{ "Authorization" = "Bearer $cred" }

Invoke-WebRequest `
  -Method POST `
  -Headers $headers `
  -ContentType: "application/json; charset=utf-8" `
  -InFile request.json `
  -Uri "https://vision.googleapis.com/v1/images:annotate" | Select-Object -Expand Content

If the request is successful, the server returns a 200 OK HTTP status code and the response in JSON format.

Response:

Note: Zero coordinate values omitted. When the API detects a coordinate ("x" or "y") value of 0, that coordinate is omitted in the JSON response. Thus, a response with a bounding poly around the entire image would be
[{},{"x": 100},{"x": 100,"y": 100},{"y": 100}] for an image that is 100px by 100px. For more information, see the API Reference documentation.

Response

{
  "responses": [
    {
      "localizedObjectAnnotations": [
        {
          "mid": "/m/01bqk0",
          "name": "Bicycle wheel",
          "score": 0.89648587,
          "boundingPoly": {
            "normalizedVertices": [
              {
                "x": 0.32076266,
                "y": 0.78941387
              },
              {
                "x": 0.43812272,
                "y": 0.78941387
              },
              {
                "x": 0.43812272,
                "y": 0.97331065
              },
              {
                "x": 0.32076266,
                "y": 0.97331065
              }
            ]
          }
        },
        {
          "mid": "/m/0199g",
          "name": "Bicycle",
          "score": 0.886761,
          "boundingPoly": {
            "normalizedVertices": [
              {
                "x": 0.312,
                "y": 0.6616471
              },
              {
                "x": 0.638353,
                "y": 0.6616471
              },
              {
                "x": 0.638353,
                "y": 0.9705882
              },
              {
                "x": 0.312,
                "y": 0.9705882
              }
            ]
          }
        },
        {
          "mid": "/m/01bqk0",
          "name": "Bicycle wheel",
          "score": 0.6345275,
          "boundingPoly": {
            "normalizedVertices": [
              {
                "x": 0.5125398,
                "y": 0.760708
              },
              {
                "x": 0.6256646,
                "y": 0.760708
              },
              {
                "x": 0.6256646,
                "y": 0.94601655
              },
              {
                "x": 0.5125398,
                "y": 0.94601655
              }
            ]
          }
        },
        {
          "mid": "/m/06z37_",
          "name": "Picture frame",
          "score": 0.6207608,
          "boundingPoly": {
            "normalizedVertices": [
              {
                "x": 0.79177403,
                "y": 0.16160682
              },
              {
                "x": 0.97047985,
                "y": 0.16160682
              },
              {
                "x": 0.97047985,
                "y": 0.31348917
              },
              {
                "x": 0.79177403,
                "y": 0.31348917
              }
            ]
          }
        },
        {
          "mid": "/m/0h9mv",
          "name": "Tire",
          "score": 0.55886006,
          "boundingPoly": {
            "normalizedVertices": [
              {
                "x": 0.32076266,
                "y": 0.78941387
              },
              {
                "x": 0.43812272,
                "y": 0.78941387
              },
              {
                "x": 0.43812272,
                "y": 0.97331065
              },
              {
                "x": 0.32076266,
                "y": 0.97331065
              }
            ]
          }
        },
        {
          "mid": "/m/02dgv",
          "name": "Door",
          "score": 0.5160098,
          "boundingPoly": {
            "normalizedVertices": [
              {
                "x": 0.77569866,
                "y": 0.37104446
              },
              {
                "x": 0.9412425,
                "y": 0.37104446
              },
              {
                "x": 0.9412425,
                "y": 0.81507325
              },
              {
                "x": 0.77569866,
                "y": 0.81507325
              }
            ]
          }
        }
      ]
    }
  ]
}

C#

Before trying this sample, follow the C# setup instructions in the Vision API Quickstart Using Client Libraries . For more information, see the Vision API C# API reference documentation .

View on GitHub Feedback

            var client = ImageAnnotatorClient.Create();
            var response = client.DetectLocalizedObjects(image);

            Console.WriteLine($"Number of objects found {response.Count}");
            foreach (var localizedObject in response)
            {
                Console.Write($"\n{localizedObject.Name}");
                Console.WriteLine($" (confidence: {localizedObject.Score})");
                Console.WriteLine("Normalized bounding polygon vertices: ");

                foreach (var vertex
                        in localizedObject.BoundingPoly.NormalizedVertices)
                {
                    Console.WriteLine($" - ({vertex.X}, {vertex.Y})");
                }
            }

Go

Before trying this sample, follow the Go setup instructions in the Vision API Quickstart Using Client Libraries . For more information, see the Vision API Go API reference documentation .

View on GitHub Feedback

// localizeObjects gets objects and bounding boxes from the Vision API for an image at the given file path.
func localizeObjects(w io.Writer, file string) error {
	ctx := context.Background()

	client, err := vision.NewImageAnnotatorClient(ctx)
	if err != nil {
		return err
	}

	f, err := os.Open(file)
	if err != nil {
		return err
	}
	defer f.Close()

	image, err := vision.NewImageFromReader(f)
	if err != nil {
		return err
	}
	annotations, err := client.LocalizeObjects(ctx, image, nil)
	if err != nil {
		return err
	}

	if len(annotations) == 0 {
		fmt.Fprintln(w, "No objects found.")
		return nil
	}

	fmt.Fprintln(w, "Objects:")
	for _, annotation := range annotations {
		fmt.Fprintln(w, annotation.Name)
		fmt.Fprintln(w, annotation.Score)

		for _, v := range annotation.BoundingPoly.NormalizedVertices {
			fmt.Fprintf(w, "(%f,%f)\n", v.X, v.Y)
		}
	}

	return nil
}

Java

Before trying this sample, follow the Java setup instructions in the Vision API Quickstart Using Client Libraries. For more information, see the Vision API Java API reference documentation.

Note: For Java Spring framework users, Spring Cloud GCP offers a way to automatically configure authentication settings and client objects to use Vision API.

View on GitHub Feedback

/**
 * Detects localized objects in the specified local image.
 *
 * @param filePath The path to the file to perform localized object detection on.
 * @param out A {@link PrintStream} to write detected objects to.
 * @throws Exception on errors while closing the client.
 * @throws IOException on Input/Output errors.
 */
public static void detectLocalizedObjects(String filePath, PrintStream out)
    throws Exception, IOException {
  List<AnnotateImageRequest> requests = new ArrayList<>();

  ByteString imgBytes = ByteString.readFrom(new FileInputStream(filePath));

  Image img = Image.newBuilder().setContent(imgBytes).build();
  AnnotateImageRequest request =
      AnnotateImageRequest.newBuilder()
          .addFeatures(Feature.newBuilder().setType(Type.OBJECT_LOCALIZATION))
          .setImage(img)
          .build();
  requests.add(request);

  // Perform the request
  try (ImageAnnotatorClient client = ImageAnnotatorClient.create()) {
    BatchAnnotateImagesResponse response = client.batchAnnotateImages(requests);
    List<AnnotateImageResponse> responses = response.getResponsesList();

    // Display the results
    for (AnnotateImageResponse res : responses) {
      for (LocalizedObjectAnnotation entity : res.getLocalizedObjectAnnotationsList()) {
        out.format("Object name: %s\n", entity.getName());
        out.format("Confidence: %s\n", entity.getScore());
        out.format("Normalized Vertices:\n");
        entity
            .getBoundingPoly()
            .getNormalizedVerticesList()
            .forEach(vertex -> out.format("- (%s, %s)\n", vertex.getX(), vertex.getY()));
      }
    }
  }
}

Node.js

Before trying this sample, follow the Node.js setup instructions in the Vision API Quickstart Using Client Libraries . For more information, see the Vision API Node.js API reference documentation .

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// Imports the Google Cloud client libraries
const vision = require('@google-cloud/vision');
const fs = require('fs');

// Creates a client
const client = new vision.ImageAnnotatorClient();

/**
 * TODO(developer): Uncomment the following line before running the sample.
 */
// const fileName = `/path/to/localImage.png`;
const request = {
  image: {content: fs.readFileSync(fileName)},
};

const [result] = await client.objectLocalization(request);
const objects = result.localizedObjectAnnotations;
objects.forEach(object => {
  console.log(`Name: ${object.name}`);
  console.log(`Confidence: ${object.score}`);
  const vertices = object.boundingPoly.normalizedVertices;
  vertices.forEach(v => console.log(`x: ${v.x}, y:${v.y}`));
});

PHP

Before trying this sample, follow the PHP setup instructions in the Vision API Quickstart Using Client Libraries . For more information, see the Vision API PHP API reference documentation .

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namespace Google\Cloud\Samples\Vision;

use Google\Cloud\Vision\V1\ImageAnnotatorClient;

// $path = 'path/to/your/image.jpg'

function detect_object($path)
{
    $imageAnnotator = new ImageAnnotatorClient();

    # annotate the image
    $image = file_get_contents($path);
    $response = $imageAnnotator->objectLocalization($image);
    $objects = $response->getLocalizedObjectAnnotations();

    foreach ($objects as $object) {
        $name = $object->getName();
        $score = $object->getScore();
        $vertices = $object->getBoundingPoly()->getNormalizedVertices();

        printf('%s (confidence %d)):' . PHP_EOL, $name, $score);
        print('normalized bounding polygon vertices: ');
        foreach ($vertices as $vertex) {
            printf(' (%d, %d)', $vertex->getX(), $vertex->getY());
        }
        print(PHP_EOL);
    }

    $imageAnnotator->close();
}

Python

Before trying this sample, follow the Python setup instructions in the Vision API Quickstart Using Client Libraries . For more information, see the Vision API Python API reference documentation .

View on GitHub Feedback

def localize_objects(path):
    """Localize objects in the local image.

    Args:
    path: The path to the local file.
    """
    from google.cloud import vision
    client = vision.ImageAnnotatorClient()

    with open(path, 'rb') as image_file:
        content = image_file.read()
    image = vision.types.Image(content=content)

    objects = client.object_localization(
        image=image).localized_object_annotations

    print('Number of objects found: {}'.format(len(objects)))
    for object_ in objects:
        print('\n{} (confidence: {})'.format(object_.name, object_.score))
        print('Normalized bounding polygon vertices: ')
        for vertex in object_.bounding_poly.normalized_vertices:
            print(' - ({}, {})'.format(vertex.x, vertex.y))

Ruby

Before trying this sample, follow the Ruby setup instructions in the Vision API Quickstart Using Client Libraries . For more information, see the Vision API Ruby API reference documentation .

View on GitHub Feedback

# image_path = "Path to local image file, eg. './image.png'"

require "google/cloud/vision"

image_annotator = Google::Cloud::Vision::ImageAnnotator.new

response = image_annotator.object_localization_detection image: image_path

response.responses.each do |res|
  res.localized_object_annotations.each do |object|
    puts "#{object.name} (confidence: #{object.score})"
    puts "Normalized bounding polygon vertices:"
    object.bounding_poly.normalized_vertices.each do |vertex|
      puts " - (#{vertex.x}, #{vertex.y})"
    end
  end
end

Detect objects in a remote image

For your convenience, the Vision API can perform feature detection directly on an image file located in Google Cloud Storage or on the Web without the need to send the contents of the image file in the body of your request.

Caution: When fetching images from HTTP/HTTPS URLs, Google cannot guarantee that the request will be completed. Your request may fail if the specified host denies the request (for example, due to request throttling or DOS prevention), or if Google throttles requests to the site for abuse prevention. You should not depend on externally-hosted images for production applications.

REST & CMD LINE

Before using any of the request data below, make the following replacements:

• cloud-storage-image-uri: the path to a valid image file in a Cloud Storage bucket. You must at least have read privileges to the file. Example:

  • https://cloud.google.com/vision/docs/images/bicycle_example.png

HTTP method and URL:

POST https://vision.googleapis.com/v1/images:annotate

Request JSON body:

{
  "requests": [
    {
      "image": {
        "source": {
          "imageUri": "cloud-storage-image-uri"
        }
      },
      "features": [
        {
          "maxResults": 10,
          "type": "OBJECT_LOCALIZATION"
        },
      ]
    }
  ]
}

To send your request, choose one of these options:

curl

Note: If you are not executing the command below from Cloud Shell or Compute Engine, ensure you have set the GOOGLE_APPLICATION_CREDENTIALS environment variable to your service account private key file path.

Save the request body in a file called request.json, and execute the following command:

curl -X POST \
-H "Authorization: Bearer "$(gcloud auth application-default print-access-token) \
-H "Content-Type: application/json; charset=utf-8" \
-d @request.json \
https://vision.googleapis.com/v1/images:annotate

PowerShell

Note: If you are not executing the command below from Cloud Shell or Compute Engine, ensure you have set the GOOGLE_APPLICATION_CREDENTIALS environment variable to your service account private key file path.

Save the request body in a file called request.json, and execute the following command:

$cred = gcloud auth application-default print-access-token
$headers = @{ "Authorization" = "Bearer $cred" }

Invoke-WebRequest `
  -Method POST `
  -Headers $headers `
  -ContentType: "application/json; charset=utf-8" `
  -InFile request.json `
  -Uri "https://vision.googleapis.com/v1/images:annotate" | Select-Object -Expand Content

If the request is successful, the server returns a 200 OK HTTP status code and the response in JSON format.

Response:

Note: Zero coordinate values omitted. When the API detects a coordinate ("x" or "y") value of 0, that coordinate is omitted in the JSON response. Thus, a response with a bounding poly around the entire image would be
[{},{"x": 100},{"x": 100,"y": 100},{"y": 100}] for an image that is 100px by 100px. For more information, see the API Reference documentation.

Response

{
  "responses": [
    {
      "localizedObjectAnnotations": [
        {
          "mid": "/m/01bqk0",
          "name": "Bicycle wheel",
          "score": 0.89648587,
          "boundingPoly": {
            "normalizedVertices": [
              {
                "x": 0.32076266,
                "y": 0.78941387
              },
              {
                "x": 0.43812272,
                "y": 0.78941387
              },
              {
                "x": 0.43812272,
                "y": 0.97331065
              },
              {
                "x": 0.32076266,
                "y": 0.97331065
              }
            ]
          }
        },
        {
          "mid": "/m/0199g",
          "name": "Bicycle",
          "score": 0.886761,
          "boundingPoly": {
            "normalizedVertices": [
              {
                "x": 0.312,
                "y": 0.6616471
              },
              {
                "x": 0.638353,
                "y": 0.6616471
              },
              {
                "x": 0.638353,
                "y": 0.9705882
              },
              {
                "x": 0.312,
                "y": 0.9705882
              }
            ]
          }
        },
        {
          "mid": "/m/01bqk0",
          "name": "Bicycle wheel",
          "score": 0.6345275,
          "boundingPoly": {
            "normalizedVertices": [
              {
                "x": 0.5125398,
                "y": 0.760708
              },
              {
                "x": 0.6256646,
                "y": 0.760708
              },
              {
                "x": 0.6256646,
                "y": 0.94601655
              },
              {
                "x": 0.5125398,
                "y": 0.94601655
              }
            ]
          }
        },
        {
          "mid": "/m/06z37_",
          "name": "Picture frame",
          "score": 0.6207608,
          "boundingPoly": {
            "normalizedVertices": [
              {
                "x": 0.79177403,
                "y": 0.16160682
              },
              {
                "x": 0.97047985,
                "y": 0.16160682
              },
              {
                "x": 0.97047985,
                "y": 0.31348917
              },
              {
                "x": 0.79177403,
                "y": 0.31348917
              }
            ]
          }
        },
        {
          "mid": "/m/0h9mv",
          "name": "Tire",
          "score": 0.55886006,
          "boundingPoly": {
            "normalizedVertices": [
              {
                "x": 0.32076266,
                "y": 0.78941387
              },
              {
                "x": 0.43812272,
                "y": 0.78941387
              },
              {
                "x": 0.43812272,
                "y": 0.97331065
              },
              {
                "x": 0.32076266,
                "y": 0.97331065
              }
            ]
          }
        },
        {
          "mid": "/m/02dgv",
          "name": "Door",
          "score": 0.5160098,
          "boundingPoly": {
            "normalizedVertices": [
              {
                "x": 0.77569866,
                "y": 0.37104446
              },
              {
                "x": 0.9412425,
                "y": 0.37104446
              },
              {
                "x": 0.9412425,
                "y": 0.81507325
              },
              {
                "x": 0.77569866,
                "y": 0.81507325
              }
            ]
          }
        }
      ]
    }
  ]
}

C#

Before trying this sample, follow the C# setup instructions in the Vision API Quickstart Using Client Libraries . For more information, see the Vision API C# API reference documentation .

View on GitHub Feedback

            var client = ImageAnnotatorClient.Create();
            var response = client.DetectLocalizedObjects(image);

            Console.WriteLine($"Number of objects found {response.Count}");
            foreach (var localizedObject in response)
            {
                Console.Write($"\n{localizedObject.Name}");
                Console.WriteLine($" (confidence: {localizedObject.Score})");
                Console.WriteLine("Normalized bounding polygon vertices: ");

                foreach (var vertex
                        in localizedObject.BoundingPoly.NormalizedVertices)
                {
                    Console.WriteLine($" - ({vertex.X}, {vertex.Y})");
                }
            }

Go

Before trying this sample, follow the Go setup instructions in the Vision API Quickstart Using Client Libraries . For more information, see the Vision API Go API reference documentation .

View on GitHub Feedback

// localizeObjects gets objects and bounding boxes from the Vision API for an image at the given file path.
func localizeObjectsURI(w io.Writer, file string) error {
	ctx := context.Background()

	client, err := vision.NewImageAnnotatorClient(ctx)
	if err != nil {
		return err
	}

	image := vision.NewImageFromURI(file)
	annotations, err := client.LocalizeObjects(ctx, image, nil)
	if err != nil {
		return err
	}

	if len(annotations) == 0 {
		fmt.Fprintln(w, "No objects found.")
		return nil
	}

	fmt.Fprintln(w, "Objects:")
	for _, annotation := range annotations {
		fmt.Fprintln(w, annotation.Name)
		fmt.Fprintln(w, annotation.Score)

		for _, v := range annotation.BoundingPoly.NormalizedVertices {
			fmt.Fprintf(w, "(%f,%f)\n", v.X, v.Y)
		}
	}

	return nil
}

Java

Before trying this sample, follow the Java setup instructions in the Vision API Quickstart Using Client Libraries. For more information, see the Vision API Java API reference documentation.

Note: For Java Spring framework users, Spring Cloud GCP offers a way to automatically configure authentication settings and client objects to use Vision API.

View on GitHub Feedback

/**
 * Detects localized objects in a remote image on Google Cloud Storage.
 *
 * @param gcsPath The path to the remote file on Google Cloud Storage to detect localized objects
 *     on.
 * @param out A {@link PrintStream} to write detected objects to.
 * @throws Exception on errors while closing the client.
 * @throws IOException on Input/Output errors.
 */
public static void detectLocalizedObjectsGcs(String gcsPath, PrintStream out)
    throws Exception, IOException {
  List<AnnotateImageRequest> requests = new ArrayList<>();

  ImageSource imgSource = ImageSource.newBuilder().setGcsImageUri(gcsPath).build();
  Image img = Image.newBuilder().setSource(imgSource).build();

  AnnotateImageRequest request =
      AnnotateImageRequest.newBuilder()
          .addFeatures(Feature.newBuilder().setType(Type.OBJECT_LOCALIZATION))
          .setImage(img)
          .build();
  requests.add(request);

  // Perform the request
  try (ImageAnnotatorClient client = ImageAnnotatorClient.create()) {
    BatchAnnotateImagesResponse response = client.batchAnnotateImages(requests);
    List<AnnotateImageResponse> responses = response.getResponsesList();
    client.close();
    // Display the results
    for (AnnotateImageResponse res : responses) {
      for (LocalizedObjectAnnotation entity : res.getLocalizedObjectAnnotationsList()) {
        out.format("Object name: %s\n", entity.getName());
        out.format("Confidence: %s\n", entity.getScore());
        out.format("Normalized Vertices:\n");
        entity
            .getBoundingPoly()
            .getNormalizedVerticesList()
            .forEach(vertex -> out.format("- (%s, %s)\n", vertex.getX(), vertex.getY()));
      }
    }
  }
}

Node.js

Before trying this sample, follow the Node.js setup instructions in the Vision API Quickstart Using Client Libraries . For more information, see the Vision API Node.js API reference documentation .

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// Imports the Google Cloud client libraries
const vision = require('@google-cloud/vision');

// Creates a client
const client = new vision.ImageAnnotatorClient();

/**
 * TODO(developer): Uncomment the following line before running the sample.
 */
// const gcsUri = `gs://bucket/bucketImage.png`;

const [result] = await client.objectLocalization(gcsUri);
const objects = result.localizedObjectAnnotations;
objects.forEach(object => {
  console.log(`Name: ${object.name}`);
  console.log(`Confidence: ${object.score}`);
  const veritices = object.boundingPoly.normalizedVertices;
  veritices.forEach(v => console.log(`x: ${v.x}, y:${v.y}`));
});

PHP

Before trying this sample, follow the PHP setup instructions in the Vision API Quickstart Using Client Libraries . For more information, see the Vision API PHP API reference documentation .

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namespace Google\Cloud\Samples\Vision;

use Google\Cloud\Vision\V1\ImageAnnotatorClient;

// $path = 'gs://path/to/your/image.jpg'

function detect_object_gcs($path)
{
    $imageAnnotator = new ImageAnnotatorClient();

    # annotate the image
    $response = $imageAnnotator->objectLocalization($path);
    $objects = $response->getLocalizedObjectAnnotations();

    foreach ($objects as $object) {
        $name = $object->getName();
        $score = $object->getScore();
        $vertices = $object->getBoundingPoly()->getNormalizedVertices();

        printf('%s (confidence %d)):' . PHP_EOL, $name, $score);
        print('normalized bounding polygon vertices: ');
        foreach ($vertices as $vertex) {
            printf(' (%d, %d)', $vertex->getX(), $vertex->getY());
        }
        print(PHP_EOL);
    }

    $imageAnnotator->close();
}

Python

Before trying this sample, follow the Python setup instructions in the Vision API Quickstart Using Client Libraries . For more information, see the Vision API Python API reference documentation .

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def localize_objects_uri(uri):
    """Localize objects in the image on Google Cloud Storage

    Args:
    uri: The path to the file in Google Cloud Storage (gs://...)
    """
    from google.cloud import vision
    client = vision.ImageAnnotatorClient()

    image = vision.types.Image()
    image.source.image_uri = uri

    objects = client.object_localization(
        image=image).localized_object_annotations

    print('Number of objects found: {}'.format(len(objects)))
    for object_ in objects:
        print('\n{} (confidence: {})'.format(object_.name, object_.score))
        print('Normalized bounding polygon vertices: ')
        for vertex in object_.bounding_poly.normalized_vertices:
            print(' - ({}, {})'.format(vertex.x, vertex.y))

Ruby

Before trying this sample, follow the Ruby setup instructions in the Vision API Quickstart Using Client Libraries . For more information, see the Vision API Ruby API reference documentation .

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# image_path = "Google Cloud Storage URI, eg. 'gs://my-bucket/image.png'"

require "google/cloud/vision"

image_annotator = Google::Cloud::Vision::ImageAnnotator.new

response = image_annotator.object_localization_detection image: image_path

response.responses.each do |res|
  res.localized_object_annotations.each do |object|
    puts "#{object.name} (confidence: #{object.score})"
    puts "Normalized bounding polygon vertices:"
    object.bounding_poly.normalized_vertices.each do |vertex|
      puts " - (#{vertex.x}, #{vertex.y})"
    end
  end
end
# image_path = "URI, eg. 'https://site.tld/image.png'"

require "google/cloud/vision"

image_annotator = Google::Cloud::Vision::ImageAnnotator.new

response = image_annotator.object_localization_detection image: image_path

response.responses.each do |res|
  res.localized_object_annotations.each do |object|
    puts "#{object.name} (confidence: #{object.score})"
    puts "Normalized bounding polygon vertices:"
    object.bounding_poly.normalized_vertices.each do |vertex|
      puts " - (#{vertex.x}, #{vertex.y})"
    end
  end
end

gcloud command

To detect labels in an image, use the gcloud ml vision detect-objects command as shown in the following example:

gcloud ml vision detect-objects https://cloud.google.com/vision/docs/images/bicycle_example.png

Try it

Try object detection and localization below. You can use the image specified already (https://cloud.google.com/vision/docs/images/bicycle_example.png) or specify your own image in its place. Send the request by selecting Execute.

Image credit: Bogdan Dada on Unsplash.