5.1.1. Visual Feature Analysis

Visual feature analysis extracts semantic information from images—what's in the image, what's happening, and how to describe it. This powers content moderation, image organization, and accessibility features.

Visual features available:

• Caption: Natural language description ("A dog playing in a park")
• Dense captions: Multiple descriptions for different regions
• Tags: Keywords describing image content
• Categories: Hierarchical classification (indoor/outdoor, etc.)
• Brands: Logo detection for known brands
• Adult content: Safety classification for moderation

When to use which feature:

• Caption for accessibility alt-text
• Tags for image search indexing
• Categories for content organization
• Adult content for upload moderation