Watson visual recognition, classify against multiple classifiers in java

Question

I found this curl command in API document that can classify an image against multiple classifiers:

    curl -u "{username}":"{password}" \
-X POST \
-F "images_file=@batch1.zip" \
-F "classifier_ids=<classifierlist.json" \
"https://gateway.watsonplatform.net/visual-recognition-beta/api/v2/classify?version=2015-12-02"

I wondered if it is possible to do this in java since I'm working on an android program using Watson's visual recognition service.

thank you

Answer 1

Use this tutorial to set your Java environment

https://developer.ibm.com/recipes/tutorials/bluemix-watson-apis-quickstart-using-java-sdk/

Then take a look on this other tutorial that shows how to use multiple classifiers using Java code

https://developer.ibm.com/recipes/tutorials/estimate-a-childs-age-based-on-photos-using-watson-visual-recognition/

Briefly speaking, your code will look like this

Step #1 - create the classifiers

 VisualRecognition service = new VisualRecognition(VisualRecognition.VERSION_DATE_2015_12_02);
 service.setUsernameAndPassword("*******", "********");

 File p1 = new File("/home/leoks/Desktop/models/pos2010-2011.zip");
 File n1 = new File("/home/leoks/Desktop/models/pos2014-2015.zip");
 VisualClassifier c1 = service.createClassifier("2010", p1, n1);

 File p3 = new File("/home/leoks/Desktop/models/pos2014-2015.zip");
 File n3 = new File("/home/leoks/Desktop/models/pos2010-2011.zip");
 VisualClassifier c3 = service.createClassifier("2014", p3, n3);

System.out.println(service.getClassifiers());

Step #2 - use them

File image = new File("...");

 VisualClassifier vc1 = new VisualClassifier("2010_633980596");
 VisualClassifier vc2 = new VisualClassifier("2014_450835300");
 VisualClassification result = service.classify(image, vc1,vc2);
 System.out.println(result);

If your image is identified by the classifier, it will return the score, otherwise, no answer will be returned. E.g.

{
 "images": [
 {
 "image": "2012.jpg",
 "scores": [
 {
 "classifier_id": "2010_633980596",
 "name": "2010",
 "score": 0.992153
 },
 {
 "classifier_id": "2014_450835300",
 "name": "2014",
 "score": 0.833185
 }
 ]
 }
 ]
}

check the tutorials, they're step-by-step instructions. Good luck.

Answer 2

You can use the Watson Java SDK - Visual Recognition. It provides a Java client library to use the Watson Developer Cloud services, a collection of REST APIs and SDKs that use cognitive computing to solve complex problems.

In your case you can use the classify() method of the Visual Recognition class. Take a look at the VisualRecognition Class Documentation.