__2017-12-16 如一模式识别研究

如一模式识别研究

智能算法>>c#下分割图像的几种办法

转自:http://www.cnblogs.com/fdmlhm/articles/868675.html

Bitmap bb = (Bitmap)Image.FromFile("...");

Bitmap sepbitmap1= bb.Clone(new System.Drawing.Rectangle(0,0,20,20),System.Drawing.Imaging.PixelFormat.Format32bppPArgb);

Image image = System.Drawing.Image.FromFile("a.jpg",true);

Bitmap bmp = new Bitmap(400,400);

Graphics grap = Graphics.FromImage(bmp);

grap.Clear(Color.Transparent);

grap.DrawImage(image,new Rectangle(0,0,400,400));

如果a.jpg的大小是4000*4000,这样在新的图像中得到的就是左上角起的400*400的一部份.

若要10*10,则用循环就可实现

[System.Runtime.InteropServices.DllImportAttribute ( "gdi32.dll" ) ]

private static extern bool BitBlt (

IntPtr hdcDest , // 目标 DC的句柄

int nXDest ,

int nYDest ,

int nWidth ,

int nHeight ,

IntPtr hdcSrc , // 源DC的句柄

int nXSrc ,

int nYSrc ,

System.Int32 dwRop // 光栅的处理数值

) ;

private void button1_Click(object sender, System.EventArgs e)

{

try

{

string file = null;

Bitmap bmp = null;

IntPtr dc1 = IntPtr.Zero;

IntPtr dc2 = IntPtr.Zero;

int row = 2, col = 2;

int left = 0, top =0 , width = 0, height = 0;

for(int i=0; i

{

left = 0;

top = i * ((int)(this.pictureBox1.Height / row));

for(int j=0; j

{

file = @"c:\"+ i.ToString() + j.ToString() +".bmp";

if (j == col-1)

width = this.pictureBox1.Width - ((int)(this.pictureBox1.Width / col)) * j;

else

width = (int)(this.pictureBox1.Width / col);

if (i == row-1)

height = this.pictureBox1.Height - ((int)(this.pictureBox1.Height / row)) * i;

else

height = (int)(this.pictureBox1.Height / row);

Graphics g1 = this.pictureBox1.CreateGraphics();

bmp = new Bitmap(width, height, g1);

Graphics g2 = Graphics.FromImage(bmp);

dc1 = g1.GetHdc();

dc2 = g2.GetHdc();

BitBlt (dc2 , 0 , 0 , width , height , dc1 , left , top , 13369376 ) ;

g1.ReleaseHdc(dc1) ;

g2.ReleaseHdc(dc2) ;

g1.Dispose();

g2.Dispose();

bmp.Save(file, System.Drawing.Imaging.ImageFormat.Bmp);

left += width;

}

}

}

catch(Exception ex)

{

MessageBox.Show(ex.ToString());

}

}

分类: C#

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