public void TestCompareCompressedPicture()
{
using (var imageStream1 = TestImage.Flora.GetStream())
using (var bmp1 = (Bitmap)Image.FromStream(imageStream1))
using (var imageStream2 = TestImage.FloraCompressed.GetStream())
using (var bmp2 = (Bitmap)Image.FromStream(imageStream2))
{
var hash1 = BitmapHash.Compute(bmp1);
var hash2 = BitmapHash.Compute(bmp2);
var diff = BinaryUtils.ComputeByteArrayEquality(hash1, hash2);
Assert.True(diff > 0.9);
}
}
public float Compare(HashContext context, Hash bitmapHash)
{
var colorData = bitmapHash.HashData.AsSpan(32);
var colorFactor = ComputeColorFactor(colorData, context.ColorData.Span);
var bitmapHashData = bitmapHash.HashData.AsSpan(0, 32);
float bestSimilarity = 0;
foreach (var variant in context.Variants)
{
var similarity = BinaryUtils.ComputeByteArrayEquality(variant.Span, bitmapHashData);
bestSimilarity = Math.Max(bestSimilarity, similarity);
}
return(bestSimilarity * colorFactor);
}
