public void CreateAndDispose()
{
using (var model = PHash.Create())
{
GC.KeepAlive(model);
}
}
private void PHashToolStripMenuItem_Click(object sender, EventArgs e)
{
if (isPHashCompare)
{
setIntilControl();
}
if (pb1.Image != null)
{
originalImage();
var alg = new PHash();
var hashResult = new Mat();
//Compute the hash
alg.Compute(ImgInput, hashResult);
// Get the data from the unmanage memeory
var data = new byte[hashResult.Width * hashResult.Height];
Marshal.Copy(hashResult.DataPointer, data, 0, hashResult.Width * hashResult.Height);
// Concatenate the Hex values representation
var hashHex = BitConverter.ToString(data).Replace("-", string.Empty);
// hashHex has the hex values concatenation as string;
toolStripStatusLabel1.Text = "PHash: " + hashHex;
hideThresholdingControls();
}
else
{
MessageBox.Show("Please open the image.", "Please");
}
}
public void CompareSameImage()
{
using (var model = PHash.Create())
using (var img1 = Image("lenna.png", ImreadModes.GrayScale))
{
double hash = model.Compare(img1, img1);
Assert.Equal(0, hash, 6);
}
}
public void CompareDifferentImage()
{
using (var model = PHash.Create())
using (var img1 = Image("lenna.png", ImreadModes.GrayScale))
using (var img2 = Image("building.jpg", ImreadModes.GrayScale))
{
var size = new Size(256, 256);
using (var scaledImg1 = img1.Resize(size))
using (var scaledImg2 = img2.Resize(size))
{
double hash = model.Compare(scaledImg1, scaledImg2);
Assert.Equal(264411, hash, 6);
}
}
}
public async Task <IEnumerable <PHash> > ComputePHashs(IEnumerable <Photogragh> photograghs)
{
return(await Task.Run(() =>
{
var list = new BlockingCollection <PHash>();
Parallel.ForEach(photograghs, photo =>
{
var phash = new PHash(photo.ComputePHash());
list.Add(phash);
});
list.CompleteAdding();
return list;
}
));
}
public async Task CanLoadAndCompareDDSImages()
{
var hash1 = await ImageState.GetPHash(AbsolutePath.EntryPoint.Combine("Resources", "test-dxt5.dds"));
var state1 = await ImageState.GetState(AbsolutePath.EntryPoint.Combine("Resources", "test-dxt5.dds"));
Assert.Equal(512, state1 !.Width);
Assert.Equal(512, state1 !.Height);
Assert.Equal(DXGI_FORMAT.BC3_UNORM, state1.Format);
var hash2 = await ImageState.GetPHash(AbsolutePath.EntryPoint.Combine("Resources", "test-dxt5.dds"));
// From old embedded hashing method, we want to make sure the hashing algorithm hasn't changed so much that
// we've broken the old caches
var hash3 = PHash.FromBase64("cns+/2xel0ulcwCXeTlVW2x5aGtwaGl9glpthWZkb2ducnF0c2lvgQ==");
Assert.Equal(1, hash1.Similarity(hash2));
Assert.True(hash1.Similarity(hash3) > 0.99f);
}
public void Compute()
{
using (var model = PHash.Create())
using (var img = Image("lenna.png"))
using (var hash = new MatOfByte())
{
model.Compute(img, hash);
Assert.Equal(1, hash.Rows);
Assert.Equal(8, hash.Cols);
Assert.Equal(MatType.CV_8UC1, hash.Type());
var hashArray = hash.ToArray();
Assert.Equal(152, hashArray[0]);
Assert.Equal(99, hashArray[1]);
Assert.Equal(42, hashArray[2]);
Assert.Equal(180, hashArray[3]);
Assert.Equal(206, hashArray[4]);
Assert.Equal(197, hashArray[5]);
Assert.Equal(97, hashArray[6]);
Assert.Equal(25, hashArray[7]);
}
}
public float Instance(PHash a, PHash b) => ImagePhash.GetCrossCorrelation(a.Value, b.Value);
public override int GetHashCode()
{
return(PHash.GetHashCode());
}
