private RGBdata ProcessBitmap(Bitmap a)
{
BitmapData bmpData = a.LockBits(new Rectangle(0, 0, a.Width, a.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
IntPtr ptr = bmpData.Scan0;
RGBdata data = new RGBdata();
unsafe
{
byte *p = (byte *)(void *)ptr;
int offset = bmpData.Stride - a.Width * 3;
int width = a.Width * 3;
for (int y = 0; y < a.Height; ++y)
{
for (int x = 0; x < width; ++x)
{
data.r += p[0]; //gets red values
data.g += p[1]; //gets green values
data.b += p[2]; //gets blue values
++p;
}
p += offset;
}
}
a.UnlockBits(bmpData);
return(data);
}
public double GetSimilarity(Bitmap a, Bitmap b)
{
RGBdata dataA = ProcessBitmap(a);
RGBdata dataB = ProcessBitmap(b);
double result = 0;
int averageA = 0;
int averageB = 0;
int maxA = 0;
int maxB = 0;
maxA = ((a.Width * 3) * a.Height);
maxB = ((b.Width * 3) * b.Height);
switch (dataA.GetLargest()) //Find dominant color to compare
{
case 1:
{
averageA = Math.Abs(dataA.r / maxA);
averageB = Math.Abs(dataB.r / maxB);
result = (averageA - averageB) / 2;
break;
}
case 2:
{
averageA = Math.Abs(dataA.g / maxA);
averageB = Math.Abs(dataB.g / maxB);
result = (averageA - averageB) / 2;
break;
}
case 3:
{
averageA = Math.Abs(dataA.b / maxA);
averageB = Math.Abs(dataB.b / maxB);
result = (averageA - averageB) / 2;
break;
}
}
result = Math.Abs((result + 100) / 100);
if (result > 1.0)
{
result -= 1.0;
}
return(result);
}
private RGBdata ProcessBitmap(Bitmap a)
{
BitmapData bmpData = a.LockBits(new Rectangle(0, 0, a.Width, a.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
IntPtr ptr = bmpData.Scan0;
RGBdata data = new RGBdata();
unsafe
{
byte* p = (byte*)(void*)ptr;
int offset = bmpData.Stride - a.Width * 3;
int width = a.Width * 3;
for (int y = 0; y < a.Height; ++y)
{
for (int x = 0; x < width; ++x)
{
data.r += p[0]; //gets red values
data.g += p[1]; //gets green values
data.b += p[2]; //gets blue values
++p;
}
p += offset;
}
}
a.UnlockBits(bmpData);
return data;
}
