ImageHash

Perceptual image hashing using the ImageSharp library. Includes three hashing algorithms (AverageHash, DifferenceHash, and PerceptualHash). See github for more information.

Calculate image hash

var hashAlgorithm = new AverageHash(); // or one of the other available algorithms: // var hashAlgorithm = new DifferenceHash(); // var hashAlgorithm = new PerceptualHash(); string filename = "your filename"; using var stream = File.OpenRead(filename); ulong imageHash = hashAlgorithm.Hash(stream);

Calculate image similarity

Note that to calculate the image similarity, both image hashes should have been calculated using the same hash algorihm.

// calculate the two image hashes ulong hash1 = hashAlgorithm.Hash(imageStream1); ulong hash2 = hashAlgorithm.Hash(imageStream2); double percentageImageSimilarity = CompareHash.Similarity(hash1, hash2);