GCP Cloud Vision Features:

Face Detection: Locates human faces within an image and provides bounding polygons around each face. It can also identify facial "landmarks" such as eyes, nose, mouth, and ears, along with confidence values. Additionally, it estimates emotional states (joy, sorrow, anger, surprise) and general face properties (underexposed, blurred, headwear).

Label Detection: Identifies objects, locations, activities, animal species, products, and more present in an image, providing descriptive labels and confidence scores. This is useful for automatic image tagging and categorization.

Text Detection (OCR): Performs Optical Character Recognition (OCR) to extract text from images. It identifies and extracts UTF-8 text, providing bounding boxes for words and the recognized text. It's optimized for sparse text areas within larger images.

Safe Search Detection: Detects explicit content within an image across categories like adult, spoof, medical, violence, and racy, providing likelihood ratings for each. This is crucial for content moderation.

Web Detection: Discovers web references to an image by identifying Web Entities, Matching Images and Best Guess Labels

Logo Detection: Detects common product and brand logos within an image and provides bounding boxes and confidence scores.

Landmark Detection: Identifies popular natural and human-made landmarks in an image and provides their name, geographic coordinates (latitude and longitude), and a bounding box.

Image Properties: Analyzes the overall visual characteristics of an image, such as dominant colors.

AWS Rekognition Features:

Face Detection: Detects up to 100 faces in the image using Rekognition ML models. For each face detected, the operation returns face details including bounding box and a fixed set of attributes such as facial, pose, gender, age & emotional state.

Face Matching: Leverage the power of AWS Rekognition services to to perform a biometric match between a source face image and a target face image

Content Moderation: Detect explicit adult or suggestive content, violence, drugs, tobacco, alcohol, hate symbols, gambling, and disturbing content in images with AWS Rekognition's Content Moderation capabilities.

Celebrity Search: AWS Celebrity recognition automatically recognize tens of thousands of well-known personalities in images and videos using machine learning. The metadata provided by the celebrity recognition API significantly reduces the repetitive manual effort required to tag content and make it readily searchable.