Basic sample to call the Azure Cognitive Services Vision API to obtain tags, objects, a description and more from an image.

Azure_CognitiveServices_VisionAPI

using System;
using System.Collections.Generic;
using Microsoft.Azure.CognitiveServices.Vision.ComputerVision;
using Microsoft.Azure.CognitiveServices.Vision.ComputerVision.Models;
using System.Threading.Tasks;
using System.IO;

namespace COB.Azure.ComputerVision
{
    class Program
    {
        private static string SUBSCRIPTION_KEY = "3f51127f19b84396b55c376ef61fbfb9";
        private static string COGNITIVE_SERVICES_ENDPOINT = "https://uksouth.api.cognitive.microsoft.com/";
        private static string IMAGE_URL = "https://cobgenstorage.blob.core.windows.net/general/COB_Future_Decoded_2019.jpg";

        public static ComputerVisionClient Authenticate(string endpoint, string key)
        {
            ComputerVisionClient client = new ComputerVisionClient(new ApiKeyServiceClientCredentials(key))
            {
                Endpoint = endpoint
            };
            return client;
        }

        public static async Task AnalyzeImageUrl(ComputerVisionClient client, string imageUrl)
        {
            Console.WriteLine("----------------------------------------------------------");
            Console.WriteLine("ANALYZE IMAGE - URL");
            Console.WriteLine();

            // specify all the types of analysis we want to perform..
            List<VisualFeatureTypes> features = new List<VisualFeatureTypes>()
            {
              VisualFeatureTypes.Categories, VisualFeatureTypes.Description,
              VisualFeatureTypes.Faces, VisualFeatureTypes.ImageType,
              VisualFeatureTypes.Tags, VisualFeatureTypes.Adult,
              VisualFeatureTypes.Color, VisualFeatureTypes.Brands,
              VisualFeatureTypes.Objects
            };

            ImageAnalysis results = await client.AnalyzeImageAsync(imageUrl, features);

            // image tags and their confidence score..
            Console.WriteLine("Tags:");
            foreach (var tag in results.Tags)
            {
                Console.WriteLine($"{tag.Name} {tag.Confidence}");
            }

            Console.WriteLine();

            // objects detected..
            Console.WriteLine("Objects:");
            foreach (var obj in results.Objects)
            {
                Console.WriteLine($"{obj.ObjectProperty} with confidence {obj.Confidence} at location {obj.Rectangle.X}, " +
                  $"{obj.Rectangle.X + obj.Rectangle.W}, {obj.Rectangle.Y}, {obj.Rectangle.Y + obj.Rectangle.H}");
            }
        }

        static async Task Main(string[] args)
        {
            ComputerVisionClient client = Authenticate(COGNITIVE_SERVICES_ENDPOINT, SUBSCRIPTION_KEY);

            Console.WriteLine($"Analyzing image {Path.GetFileName(IMAGE_URL)}...");
            Console.WriteLine();

            await AnalyzeImageUrl(client, IMAGE_URL);

            Console.ReadLine();
        }
    }
}