/// <summary>
/// Calculate energy between the given two pixels
/// </summary>
/// <param name="Pixel1">First pixel color</param>
/// <param name="Pixel2">Second pixel color</param>
/// <returns>Energy between the 2 pixels</returns>
public static int CalculatePixelsEnergy(MyColor Pixel1, MyColor Pixel2)
{
int Energy = Math.Abs(Pixel1.red - Pixel2.red) + Math.Abs(Pixel1.green - Pixel2.green) + Math.Abs(Pixel1.blue - Pixel2.blue);
return(Energy);
}
/// <summary>
/// Open an image and load it into 2D array of colors (size: Height x Width)
/// </summary>
/// <param name="ImagePath">Image file path</param>
/// <returns>2D array of colors</returns>
public static MyColor[,] OpenImage(string ImagePath)
{
Bitmap original_bm = new Bitmap(ImagePath);
int Height = original_bm.Height;
int Width = original_bm.Width;
MyColor[,] Buffer = new MyColor[Height, Width];
unsafe
{
BitmapData bmd = original_bm.LockBits(new Rectangle(0, 0, Width, Height), ImageLockMode.ReadWrite, original_bm.PixelFormat);
int x, y;
int nWidth = 0;
bool Format32 = false;
bool Format24 = false;
bool Format8 = false;
if (original_bm.PixelFormat == PixelFormat.Format24bppRgb)
{
Format24 = true;
nWidth = Width * 3;
}
else if (original_bm.PixelFormat == PixelFormat.Format32bppArgb || original_bm.PixelFormat == PixelFormat.Format32bppRgb || original_bm.PixelFormat == PixelFormat.Format32bppPArgb)
{
Format32 = true;
nWidth = Width * 4;
}
else if (original_bm.PixelFormat == PixelFormat.Format8bppIndexed)
{
Format8 = true;
nWidth = Width;
}
int nOffset = bmd.Stride - nWidth;
byte *p = (byte *)bmd.Scan0;
for (y = 0; y < Height; y++)
{
for (x = 0; x < Width; x++)
{
if (Format8)
{
Buffer[y, x].red = Buffer[y, x].green = Buffer[y, x].blue = p[0];
p++;
}
else
{
Buffer[y, x].red = p[0];
Buffer[y, x].green = p[1];
Buffer[y, x].blue = p[2];
if (Format24)
{
p += 3;
}
else if (Format32)
{
p += 4;
}
}
}
p += nOffset;
}
original_bm.UnlockBits(bmd);
}
return(Buffer);
}
/// <summary>
/// Normal resize of an image
/// </summary>
/// <param name="ImageMatrix">2D array of image values</param>
/// <param name="NewWidth">desired width</param>
/// <param name="NewHeight">desired height</param>
/// <returns>Resized image</returns>
public static MyColor[,] NormalResize(MyColor[,] ImageMatrix, int NewWidth, int NewHeight)
{
int i = 0, j = 0;
int Height = ImageMatrix.GetLength(0);
int Width = ImageMatrix.GetLength(1);
double WidthRatio = (double)(Width) / (double)(NewWidth);
double HeightRatio = (double)(Height) / (double)(NewHeight);
int OldWidth = Width;
int OldHeight = Height;
MyColor P1, P2, P3, P4;
MyColor Y1, Y2, X = new MyColor();
MyColor[,] Data = new MyColor[NewHeight, NewWidth];
Width = NewWidth;
Height = NewHeight;
int floor_x, ceil_x;
int floor_y, ceil_y;
double x, y;
double fraction_x, one_minus_x;
double fraction_y, one_minus_y;
for (j = 0; j < NewHeight; j++)
{
for (i = 0; i < NewWidth; i++)
{
x = (double)(i) * WidthRatio;
y = (double)(j) * HeightRatio;
floor_x = (int)(x);
ceil_x = floor_x + 1;
if (ceil_x >= OldWidth)
{
ceil_x = floor_x;
}
floor_y = (int)(y);
ceil_y = floor_y + 1;
if (ceil_y >= OldHeight)
{
ceil_y = floor_y;
}
fraction_x = x - floor_x;
one_minus_x = 1.0 - fraction_x;
fraction_y = y - floor_y;
one_minus_y = 1.0 - fraction_y;
P1 = ImageMatrix[floor_y, floor_x];
P2 = ImageMatrix[ceil_y, floor_x];
P3 = ImageMatrix[floor_y, ceil_x];
P4 = ImageMatrix[ceil_y, ceil_x];
Y1.red = (byte)(one_minus_y * P1.red + fraction_y * P2.red);
Y1.green = (byte)(one_minus_y * P1.green + fraction_y * P2.green);
Y1.blue = (byte)(one_minus_y * P1.blue + fraction_y * P2.blue);
Y2.red = (byte)(one_minus_y * P3.red + fraction_y * P4.red);
Y2.green = (byte)(one_minus_y * P3.green + fraction_y * P4.green);
Y2.blue = (byte)(one_minus_y * P3.blue + fraction_y * P4.blue);
X.red = (byte)(one_minus_x * Y1.red + fraction_x * Y2.red);
X.green = (byte)(one_minus_x * Y1.green + fraction_x * Y2.green);
X.blue = (byte)(one_minus_x * Y1.blue + fraction_x * Y2.blue);
Data[j, i] = X;
}
}
return(Data);
}
