AlanNevill.ImageSharp.ImageHash 1.4.4-alpha

ImageHash

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

Calculate image hash

<a id='snippet-CalculateImageHash'></a>

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);

^{<a href='/tests/ImageHash.Test/Examples.cs#L14-L26' title='Snippet source file'>snippet source</a> | <a href='#snippet-CalculateImageHash' title='Start of snippet'>anchor</a>}

Calculate image similarity

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

<a id='snippet-CalculateSimilarity'></a>

// calculate the two image hashes
ulong hash1 = hashAlgorithm.Hash(imageStream1);
ulong hash2 = hashAlgorithm.Hash(imageStream2);

double percentageImageSimilarity = CompareHash.Similarity(hash1, hash2);

^{<a href='/tests/ImageHash.Test/Examples.cs#L35-L43' title='Snippet source file'>snippet source</a> | <a href='#snippet-CalculateSimilarity' title='Start of snippet'>anchor</a>}