private double Similarity(ref NativeStructures.Digest digest1, ref NativeStructures.Digest digest2)
{
double result;
NativeFunctions.ph_crosscorr(ref digest1, ref digest2, out result);
return(1f - result);
}
public int Detect(String imagePath, out double similarity)
{
similarity = 1.0;
NativeStructures.Digest imageDigest;
if (Hash(imagePath, out imageDigest))
{
int bestCardID = -1;
foreach (ReferenceCardRadialHash hash in _hashes)
{
NativeStructures.Digest cardDigest = new NativeStructures.Digest();
double newSimilarity = 1.0;
unsafe
{
fixed(byte *ptr = hash.Hash)
{
cardDigest.coeffs = (IntPtr)ptr;
cardDigest.size = hash.Hash.Length;
newSimilarity = Similarity(ref imageDigest, ref cardDigest);
}
}
if (newSimilarity < similarity)
{
similarity = newSimilarity;
bestCardID = hash.ID;
}
}
return(bestCardID);
}
return(-1);
}
private bool Hash(String imagePath, out NativeStructures.Digest hash)
{
return(NativeFunctions.ph_image_digest(imagePath, 1.0, 1.0, out hash) != -1);
}
