public static double CalculatePSNR2(string imagePath1, string imagePath2)
{
Bitmap bmp1 = (Bitmap)Image.FromFile(imagePath1, true);
LockBitmap lockBitmap1 = new LockBitmap(bmp1);
lockBitmap1.LockBits();
Bitmap bmp2 = (Bitmap)Image.FromFile(imagePath2, true);
LockBitmap lockBitmap2 = new LockBitmap(bmp2);
lockBitmap2.LockBits();
int cpp = 3;
if ((bmp1.PixelFormat == System.Drawing.Imaging.PixelFormat.Format8bppIndexed) || (bmp2.PixelFormat == System.Drawing.Imaging.PixelFormat.Format8bppIndexed))
{
cpp = 1;
}
double totalDif = 0;
for (int i = 0; i < lockBitmap1.Height; i++)
{
for (int j = 0; j < lockBitmap1.Width; j++)
{
totalDif += Math.Pow((lockBitmap1.GetPixel(i, j).R - lockBitmap2.GetPixel(i, j).R), 2);
if (cpp == 3)
{
totalDif += Math.Pow((lockBitmap1.GetPixel(i, j).G - lockBitmap2.GetPixel(i, j).G), 2);
totalDif += Math.Pow((lockBitmap1.GetPixel(i, j).B - lockBitmap2.GetPixel(i, j).B), 2);
}
}
}
double rms = Math.Sqrt(totalDif / (lockBitmap1.Height * lockBitmap1.Width * cpp));
double psnr = 20 * Math.Log10(256 / rms);
Console.WriteLine("PSNR = " + psnr);
return(psnr);
}
public static FileTemp ExtractionWithAlgorithmLiao(string imagePath, string key, int T, int Kl, int Kh, int cpp)
{
LiaoAlgorithm lal = new LiaoAlgorithm();
Bitmap bmp = (Bitmap)Image.FromFile(imagePath, true);
LockBitmap lockBitmap = new LockBitmap(bmp);
lockBitmap.LockBits();
byte[] pixelInput = new byte[4];
bool looping = true;
BitArray namelength = new BitArray(32);
List <bool> remain = new List <bool>();
BitArray result = new BitArray(lockBitmap.Height * lockBitmap.Width * 24);
System.Drawing.Color[] pixes = new System.Drawing.Color[4];
//BitArray temp = new BitArray()
int excount = 0;
for (int i = 0; (i < lockBitmap.Width / 2) && looping; i++)
{
for (int j = 0; j < lockBitmap.Height / 2 && looping; j++)
{
pixes[0] = lockBitmap.GetPixel(i * 2, j * 2);
pixes[1] = lockBitmap.GetPixel(i * 2 + 1, j * 2);
pixes[2] = lockBitmap.GetPixel(i * 2, j * 2 + 1);
pixes[3] = lockBitmap.GetPixel(i * 2 + 1, j * 2 + 1);
for (int nrgb = 0; nrgb < cpp && looping; nrgb++)
{
switch (nrgb)
{
case 0:
for (int pixIn = 0; pixIn < 4; pixIn++)
{
pixelInput[pixIn] = pixes[pixIn].R;
}
break;
case 1:
for (int pixIn = 0; pixIn < 4; pixIn++)
{
pixelInput[pixIn] = pixes[pixIn].G;
}
break;
case 2:
for (int pixIn = 0; pixIn < 4; pixIn++)
{
pixelInput[pixIn] = pixes[pixIn].B;
}
break;
default:
break;
}
if (lal.liaoDecrypt(pixelInput, T, Kl, Kh) != null) //parameter undefined
{
BitArray temp = new BitArray(lal.liaoDecrypt(pixelInput, T, Kl, Kh));
for (int k = 0; k < temp.Count; k++)
{
result[excount++] = temp[k];
}
}
}
}
}
byte[] fileNameLengthBytes = new byte[4];
int resultcounter = 0;
BitArray tempba = new BitArray(8);
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < 8; j++)
{
tempba[j] = result[resultcounter++];
}
fileNameLengthBytes[i] = LiaoAlgorithm.ConvertToByte(tempba);
}
Int32 filenameLength = BitConverter.ToInt16(fileNameLengthBytes, 0);
byte[] fileNameBytes = new byte[filenameLength * 2];
for (int i = 0; i < filenameLength * 2; i++)
{
for (int j = 0; j < 8; j++)
{
tempba[j] = result[resultcounter++];
}
fileNameBytes[i] = LiaoAlgorithm.ConvertToByte(tempba);
}
string fileName = "";
for (int i = 0; i < filenameLength * 2; i += 2)
{
fileName = fileName + BitConverter.ToChar(fileNameBytes, i);
}
byte[] messageLengthBytes = new byte[4];
for (int i = 0; i < 4; i++)
{
for (int j = 0; j < 8; j++)
{
tempba[j] = result[resultcounter++];
}
messageLengthBytes[i] = LiaoAlgorithm.ConvertToByte(tempba);
}
Int32 messagelength = BitConverter.ToInt32(messageLengthBytes, 0);
for (int te = 0; te < messageLengthBytes.Length; te++)
{
Console.Write(messageLengthBytes[te] + ",");
}
byte[] messageBytesBeforeDecrypt = new byte[messagelength];
for (int i = 0; i < messagelength; i++)
{
for (int j = 0; j < 8; j++)
{
tempba[j] = result[resultcounter++];
}
messageBytesBeforeDecrypt[i] = LiaoAlgorithm.ConvertToByte(tempba);
}
byte[] messageBytes = Viginere.Decrypt(messageBytesBeforeDecrypt, key);
FileTemp file = new FileTemp(fileName);
file.Data = messageBytes;
return(file);
}
public static BitmapSource InsertionWithAlgorithmLiao(string imagePath, string messagePath, string key, int T, int Kl, int Kh, int cpp)
{
// Create extended message
string fileName = Path.GetFileName(messagePath);
byte[] fileNameLengthBytes = BitConverter.GetBytes((Int32)fileName.Length);
byte[] fileNameBytes = new byte[fileName.Length * 2];
for (int i = 0; i < fileName.Length; i++)
{
byte[] bt = BitConverter.GetBytes(fileName[i]);
fileNameBytes[i * 2] = bt[0];
fileNameBytes[i * 2 + 1] = bt[1];
}
byte[] messageBytesBeforeEncrypt = File.ReadAllBytes(messagePath);
byte[] messageBytes = Viginere.Encrypt(messageBytesBeforeEncrypt, key);
byte[] messageLengthBytes = BitConverter.GetBytes((Int32)messageBytes.Length);
byte[] messageExtended = new byte[4 + fileName.Length * 2 + 4 + messageBytes.Length];
int idx = 0;
for (int i = 0; i < fileNameLengthBytes.Length; i++)
{
messageExtended[idx] = fileNameLengthBytes[i];
idx++;
}
for (int i = 0; i < fileNameBytes.Length; i++)
{
messageExtended[idx] = fileNameBytes[i];
idx++;
}
for (int i = 0; i < messageLengthBytes.Length; i++)
{
messageExtended[idx] = messageLengthBytes[i];
idx++;
}
for (int i = 0; i < messageBytes.Length; i++)
{
messageExtended[idx] = messageBytes[i];
idx++;
}
//Lockbitmap pixel handling
LiaoAlgorithm lal = new LiaoAlgorithm();
Bitmap bmp = (Bitmap)Image.FromFile(imagePath, true);
LockBitmap lockBitmap = new LockBitmap(bmp);
BitArray bitmsg = new BitArray(messageExtended);
lockBitmap.LockBits();
System.Drawing.Color[] pixes = new System.Drawing.Color[4];
byte[] pixelInput = new byte[4];
bool looping = true;
int imgcapacity = 0;
//capacity counting
for (int i = 0; (i < lockBitmap.Width / 2) && looping; i++)
{
for (int j = 0; j < lockBitmap.Height / 2 && looping; j++)
{
pixes[0] = lockBitmap.GetPixel(i * 2, j * 2);
pixes[1] = lockBitmap.GetPixel(i * 2 + 1, j * 2);
pixes[2] = lockBitmap.GetPixel(i * 2, j * 2 + 1);
pixes[3] = lockBitmap.GetPixel(i * 2 + 1, j * 2 + 1);
for (int nrgb = 0; nrgb < cpp && looping; nrgb++)
{
switch (nrgb)
{
case 0:
for (int pixIn = 0; pixIn < 4; pixIn++)
{
pixelInput[pixIn] = pixes[pixIn].R;
}
break;
case 1:
for (int pixIn = 0; pixIn < 4; pixIn++)
{
pixelInput[pixIn] = pixes[pixIn].G;
}
break;
case 2:
for (int pixIn = 0; pixIn < 4; pixIn++)
{
pixelInput[pixIn] = pixes[pixIn].B;
}
break;
default:
break;
}
imgcapacity += lal.Capacity(pixelInput, T, Kl, Kh);
}
}
}
//end of capacity counting
Console.WriteLine("capacity : " + imgcapacity);
for (int i = 0; (i < lockBitmap.Width / 2) && looping; i++)
{
for (int j = 0; j < lockBitmap.Height / 2 && looping; j++)
{
pixes[0] = lockBitmap.GetPixel(i * 2, j * 2);
pixes[1] = lockBitmap.GetPixel(i * 2 + 1, j * 2);
pixes[2] = lockBitmap.GetPixel(i * 2, j * 2 + 1);
pixes[3] = lockBitmap.GetPixel(i * 2 + 1, j * 2 + 1);
for (int nrgb = 0; nrgb < cpp && looping; nrgb++)
{
switch (nrgb)
{
case 0:
for (int pixIn = 0; pixIn < 4; pixIn++)
{
pixelInput[pixIn] = pixes[pixIn].R;
}
break;
case 1:
for (int pixIn = 0; pixIn < 4; pixIn++)
{
pixelInput[pixIn] = pixes[pixIn].G;
}
break;
case 2:
for (int pixIn = 0; pixIn < 4; pixIn++)
{
pixelInput[pixIn] = pixes[pixIn].B;
}
break;
default:
break;
}
if (lal.liaoEncrypt(pixelInput, T, Kl, Kh, bitmsg) != null) //parameter undefined
{
pixelInput = lal.liaoEncrypt(pixelInput, T, Kl, Kh, bitmsg);
if ((bitmsg.Length - 4 * lal.recentk) <= 0)
{
looping = false;
}
else
{
BitArray temp = new BitArray(bitmsg.Length - 4 * lal.recentk);
for (int k = 0; k < temp.Length; k++)
{
temp[k] = bitmsg[k + 4 * lal.recentk];
}
bitmsg = temp;
}
switch (nrgb)
{
case 0:
for (int pixIn = 0; pixIn < 4; pixIn++)
{
if (cpp == 3)
{
pixes[pixIn] = System.Drawing.Color.FromArgb(pixelInput[pixIn], pixes[pixIn].G, pixes[pixIn].B);
}
else
{
pixes[pixIn] = System.Drawing.Color.FromArgb(pixelInput[pixIn], pixelInput[pixIn], pixelInput[pixIn]);
}
}
break;
case 1:
for (int pixIn = 0; pixIn < 4; pixIn++)
{
pixes[pixIn] = System.Drawing.Color.FromArgb(pixes[pixIn].R, pixelInput[pixIn], pixes[pixIn].B);
}
break;
case 2:
for (int pixIn = 0; pixIn < 4; pixIn++)
{
pixes[pixIn] = System.Drawing.Color.FromArgb(pixes[pixIn].R, pixes[pixIn].G, pixelInput[pixIn]);
}
break;
default:
break;
}
}
}
lockBitmap.SetPixel(i * 2, j * 2, pixes[0]);
lockBitmap.SetPixel(i * 2 + 1, j * 2, pixes[1]);
lockBitmap.SetPixel(i * 2, j * 2 + 1, pixes[2]);
lockBitmap.SetPixel(i * 2 + 1, j * 2 + 1, pixes[3]);
}
}
lockBitmap.UnlockBits();
BitmapSource bs = LiaoAlgorithm.ConvertBitmap(bmp);
return(bs);
}
