Sample code: Identify objects in an image with the Watson Visual Recognition service


Interactive code: When you see Run at the top of a code sample, you can run the code, check the results, make changes, and run it again. When you see Deploy, you can deploy the code into the developerWorks IBM Cloud account.

About this code

This code shows you how to use the node.js API for the Watson Visual Recognition service. Given an image, Watson attempts to identify objects in that image.

The code has two basic sections:

  1. The main() method. This is the entry point to the code. It creates the VisualRecognitionV3 object and then invokes the classify() method.
  2. A set of default parameters and the code that runs this module if it is invoked by itself (as opposed to being invoked by a require() statement). See the Node.js documentation for more information on the implications of the require.main === module statement.
Show result

This code takes a URL of an image file as input and looks for objects in that image. The call to the Watson Visual Recognition service is wrapped in a JavaScript Promise to handle the asynchronous nature of the service. See the overview of the Visual Recognition service or the GitHub repo for the Watson node.js API for more information.

To see what else Watson can identify, try these other values for imageurl:

Using this code once deployed

To use this code once you've deployed it, you must create an instance of the Watson Visual Recognition service:

To invoke the code, pass a JSON structure that matches the defaultParameters object as shown above with the following changes:

  1. The api_key and url fields must be filled in with the credentials for your Visual Recognition service instance.
  2. The use_unauthenticated field must be false.

For more information, see the developerWorks tutorial Invoking actions on the IBM Cloud Functions platform.

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Zone=Cognitive computing, Java development
ArticleTitle=Sample code: Identify objects in an image with the Watson Visual Recognition service