public static void MakeSquarePowerOfTwo(this BoxData data, int stride)
{
if ((data.Rightmost - data.LeftMost) % stride == 0)
{
return;
}
if ((data.Lowest - data.Highest) % stride == 0)
{
return;
}
int amount = (data.Rightmost - data.LeftMost) / stride;
int number = stride * (amount + 1);
number = number - (data.Rightmost - data.LeftMost);
for (int i = 0; i < number; i++)
{
if (data.LeftMost - 1 > 0)
{
data.LeftMost--;
}
else if (data.Rightmost + 1 < 512)
{
data.Rightmost++;
}
}
amount = (data.Lowest - data.Highest) / stride;
number = stride * (amount + 1);
number = number - (data.Lowest - data.Highest);
for (int i = 0; i < number; i++)
{
if (data.Highest - 1 > 0)
{
data.Highest--;
}
else if (data.Lowest + 1 < 512)
{
data.Lowest++;
}
}
}
/// <summary>
///
/// </summary>
/// <param name="first"></param>
/// <param name="second"></param>
/// <param name="size"></param>
private Tuple <Bitmap, bool> FindDifferences(Image first, Image second, int size)
{
Bitmap C = new Bitmap(first);
Bitmap R = new Bitmap(second);
BoxData tbd = new BoxData(Boxdata);
List <List <double> > diffs = Differences(C, R);
Bitmap output = new Bitmap(size, size);
unsafe {
BitmapData bitmapData =
output.LockBits(new Rectangle(0, 0, output.Width, output.Height),
ImageLockMode.ReadWrite, output.PixelFormat);
int bytesPerPixel = Image.GetPixelFormatSize(output.PixelFormat) / 8;
int heightInPixels = bitmapData.Height;
int widthInBytes = bitmapData.Width * bytesPerPixel;
byte *ptrFirstPixel = (byte *)bitmapData.Scan0;
Boxdata = new BoxData();
Parallel.For(0, heightInPixels, y => {
byte *currentLine = ptrFirstPixel + y * bitmapData.Stride;
for (int x = 0; x < widthInBytes; x = x + bytesPerPixel)
{
int value = (int)Math.Round(diffs[x / 4][y]);
value = value > 10 ? 255 : 0;
//diffs[x/4][y] = value;
currentLine[x + 3] = 255;
currentLine[x + 1] = (byte)value;
currentLine[x + 2] = (byte)value;
currentLine[x] = (byte)value;
if (value != 255)
{
continue;
}
if (x / 4 < Boxdata.LeftMost)
{
Boxdata.LeftMost = x / 4;
}
else if (x / 4 > Boxdata.Rightmost)
{
Boxdata.Rightmost = x / 4;
}
if (y < Boxdata.Highest)
{
Boxdata.Highest = y;
}
else if (y > Boxdata.Lowest)
{
Boxdata.Lowest = y;
}
}
});
Boxdata.MakeSquarePowerOfTwo(16);
output.UnlockBits(bitmapData);
}
bool found = IsolateFaces(first, diffs);
return(new Tuple <Bitmap, bool>(output, found));
}