C#による 飯テロ判定コード。 License: WTFPL

meshi.cs

using System;
using System.Drawing;
using System.IO;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Threading.Tasks;

namespace Meshi
{
    // IBM Watson (Bluemix) を利用した飯画像判定
    // 詳細は @TakesxiSximada 様の記事 http://qiita.com/TakesxiSximada/items/a482d78eaa0c854e8a9b
    // などを参照してください
    class Program
    {
        static void Main(string[] args)
        {
            if (args.Length > 0)
            {
                bool isFood = false;
                Bitmap bmp = new Bitmap(args[0]);
                Task task = Task.Factory.StartNew(() => isFood = IsFood(bmp).Result);
                task.Wait();
                Console.WriteLine(isFood ? "ご飯" : "普通");

            }
        }
        static async Task<bool> IsFood(Bitmap bmp)
        {
            string username = ""; // your username
            string password = ""; // your password
            string url = "https://gateway.watsonplatform.net/visual-recognition-beta/api/v1/tag/recognize";
            bool result = false;

            using (MemoryStream ms = new MemoryStream())
            {
                bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);
                ms.Position = 0;
                string response = "";

                using (var client = new HttpClient())
                {

                    client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Basic",
                        System.Convert.ToBase64String(System.Text.UTF8Encoding.UTF8.GetBytes(string.Format("{0}:{1}",
                        username, password))));
                    using (var content = new MultipartFormDataContent())
                    {
                        content.Add(new StreamContent(ms), "img_File", "upload.jpg");
                        using (var message = await client.PostAsync(url, content))
                        {
                            response = await message.Content.ReadAsStringAsync();
                            result = response.IndexOf("Food") > 0;
                        }
                    }
                }
            }
            return result;
        }
    }
}