Top 20 NuGet perceptual Packages

A C# implementation of libpuzzle (an image fingerprinting algorithm)
ImageDiff determines the differences between two images. Generates nice output highlighting where differences are found.
ImageDupLib offers several different perceptual hashing algorithms for detecting similar or duplicate images.
A library for hashing images and comparing those hashes for similarity.
An image hasher for comparing the similarity between images.
A global dotnet tool for comparing the similarity of two images.