WatsonのVisualRecognitionに画像をURLで指定

やること

WatsonのVisualRecognitionへ画像情報を渡す際、ファイルとして送るのではなく、AWSのS3で作成した期限付きURL情報を渡して結果を取得したい。

実装

Sample1.java

import java.io.File;
import java.util.Arrays;
import java.util.List;

import com.ibm.watson.developer_cloud.visual_recognition.v3.*;
import com.ibm.watson.developer_cloud.visual_recognition.v3.model.ClassifyImagesOptions;
import com.ibm.watson.developer_cloud.visual_recognition.v3.model.VisualClassification;


public class Sample01 {
	
	private static final String API_KEY = "作成したAPIキー";
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		System.out.println( "VisualRecognition classify start" );
        
        // インスタンス生成
        VisualRecognition service = new VisualRecognition(VisualRecognition.VERSION_DATE_2016_05_20);
        service.setApiKey(API_KEY);
        
        // classifierIds用
        List<String> list = Arrays.asList("分類器ID");
        
        // スコアを取得
        ClassifyImagesOptions options = new ClassifyImagesOptions.Builder()
        		.classifierIds(list)
        		.threshold(0.0)
        		.url("https://awsuploadsample.s3-ap-northeast-1.amazonaws.com/dalmation_0012.jpg?response-content-type=image%2Fjpeg&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20170205T071927Z&X-Amz-SignedHeaders=host&X-Amz-Expires=431989&X-Amz-Credential=AKIAIEUCF6U4XJIMGKYQ%2F20170205%2Fap-northeast-1%2Fs3%2Faws4_request&X-Amz-Signature=f9a857f597db9fc07c099aa82c7d12573d9943acd55b3b6e7343ad9cdfa36064")
        	    .build();
        VisualClassification result = service.classify(options).execute();
        
        // 結果を表示
        System.out.println(result);
        
        System.out.println( "VisualRecognition classify end" );
	}

}

↓

VisualRecognition classify start
{
  "images_processed": 1,
  "images": [
    {
      "classifiers": [
        {
          "classifier_id": "dogs_605755035",
          "name": "dogs",
          "classes": [
            {
              "class": "beagle",
              "score": 0.0529675
            },
            {
              "class": "dalmation",
              "score": 0.536878
            }
          ]
        }
      ],
      "source_url": "https://awsuploadsample.s3-ap-northeast-1.amazonaws.com/dalmation_0012.jpg?response-content-type\u003dimage%2Fjpeg\u0026X-Amz-Algorithm\u003dAWS4-HMAC-SHA256\u0026X-Amz-Date\u003d20170205T071927Z\u0026X-Amz-SignedHeaders\u003dhost\u0026X-Amz-Expires\u003d431989\u0026X-Amz-Credential\u003dAKIAIEUCF6U4XJIMGKYQ%2F20170205%2Fap-northeast-1%2Fs3%2Faws4_request\u0026X-Amz-Signature\u003df9a857f597db9fc07c099aa82c7d12573d9943acd55b3b6e7343ad9cdfa36064",
      "resolved_url": "https://awsuploadsample.s3-ap-northeast-1.amazonaws.com/dalmation_0012.jpg?response-content-type\u003dimage%2Fjpeg\u0026X-Amz-Algorithm\u003dAWS4-HMAC-SHA256\u0026X-Amz-Date\u003d20170205T071927Z\u0026X-Amz-SignedHeaders\u003dhost\u0026X-Amz-Expires\u003d431989\u0026X-Amz-Credential\u003dAKIAIEUCF6U4XJIMGKYQ%2F20170205%2Fap-northeast-1%2Fs3%2Faws4_request\u0026X-Amz-Signature\u003df9a857f597db9fc07c099aa82c7d12573d9943acd55b3b6e7343ad9cdfa36064"
    }
  ]
}
VisualRecognition classify end

できました(^^)

所感

APIでデータを送信する際、ファイルオブジェクトではなく、URL文字列でもきちんと判定してくれることがわかりました。
ローカル環境にファイルを配置できない場合などに使える感じです。