Which Computer Vision feature can you use to generate automatic captions for digital photographs?

Describe images with human-readable language
Computer Vision can analyze an image and generate a human-readable phrase that describes its contents. The algorithm returns several descriptions based on different visual features, and each description is given a confidence score. The final output is a list of descriptions ordered from highest to lowest confidence.
The image description feature is part of the Analyze Image API.
Reference:
https://docs.microsoft.com/en-us/azure/cognitive-services/computer-vision/concept-describing-images