Mat img1 = new Mat(240, 320, DepthType.Cv8U,1);img1.SetTo(new MCvScalar(100));CvInvoke.Imshow("Image", img1);

img1.Create(240, 240, DepthType.Cv8U, 3);img1.SetTo(new MCvScalar(0, 0, 255));CvInvoke.Imshow("Image", img1);

private void button14_Click(object sender, EventArgs e)
{if (chapter1OFD.ShowDialog() == DialogResult.OK)chapter1Image = CvInvoke.Imread(chapter1OFD.FileName, LoadImageType.AnyColor | LoadImageType.AnyDepth);if (chapter1Image.IsEmpty)return;imageBox2.Image = chapter1Image;
}
private void button15_Click(object sender, EventArgs e)
{if (chapter1OFD.ShowDialog() == DialogResult.OK)chapter1Mask = CvInvoke.Imread(chapter1OFD.FileName, LoadImageType.AnyColor | LoadImageType.AnyDepth);if (!chapter1Mask.IsEmpty)imageBox3.Image = chapter1Mask;
}
private void button16_Click(object sender, EventArgs e)
{if (chapter1Mask.IsEmpty)return;chapter1GrayMask = new Mat(chapter1Mask.Size, chapter1Mask.Depth, 1);CvInvoke.CvtColor(chapter1Mask, chapter1GrayMask, ColorConversion.Bgr2Gray, 1);if (!chapter1GrayMask.IsEmpty)imageBox4.Image = chapter1GrayMask;
}
private void button17_Click(object sender, EventArgs e)
{if (chapter1GrayMask.IsEmpty | chapter1Image.IsEmpty)return; Mat mask = new Mat(chapter1Image.Size, DepthType.Cv8U, 1);Mat roi = new Mat(mask, new Rectangle(chapter1Image.Cols - chapter1GrayMask.Cols, chapter1Image.Rows - chapter1GrayMask.Rows, chapter1GrayMask.Cols, chapter1GrayMask.Rows));roi.SetTo(new MCvScalar(255));imageBox4.Image = mask;Mat result = new Mat();chapter1Image.CopyTo(result, mask);imageBox5.Image = result;
}

Mat chapter2Img = new Mat();
Image<Bgr, byte> chapter2ImgBGR;
Image<Gray, byte> chapter2ImgGray;
private bool chapter2SaultNoise(Mat inImg,int n)
{int i, j;Random rd = new Random();IntPtr ip = inImg.Ptr;for(int k=0;k< n;++k){i = rd.Next(0, inImg.Rows);j = rd.Next(0, inImg.Cols);if(inImg.NumberOfChannels==1){chapter2ImgGray[i, j] = new Gray(0);}else if(inImg.NumberOfChannels==3){chapter2ImgBGR[i, j] = new Bgr(0, 0, 0);}else{return false;}}if (inImg.NumberOfChannels == 1){chapter2ImgGray.Mat.CopyTo(inImg);}else if (inImg.NumberOfChannels == 3){chapter2ImgBGR.Mat.CopyTo(inImg);}return true;
}
private void button18_Click(object sender, EventArgs e)
{if (chapter1OFD.ShowDialog() == DialogResult.OK)chapter2Img = CvInvoke.Imread(chapter1OFD.FileName, LoadImageType.AnyColor | LoadImageType.AnyDepth);elsereturn;imageBox6.Image = chapter2Img;if(chapter2Img.NumberOfChannels==1){chapter2ImgGray = chapter2Img.ToImage<Gray,byte>();}else if(chapter2Img.NumberOfChannels==3){chapter2ImgBGR = chapter2Img.ToImage<Bgr, byte>();}
}
private void button19_Click(object sender, EventArgs e)
{if (chapter2Img.IsEmpty)return;if (!chapter2SaultNoise(chapter2Img, 2000))return;imageBox6.Image = chapter2Img;
}

System.Diagnostics.Stopwatch sw = new System.Diagnostics.Stopwatch();//定时器
private void button19_Click(object sender, EventArgs e)
{if (chapter2Img.IsEmpty)return;if (!chapter2SaultNoise(chapter2Img, chapter2Img.Cols* chapter2Img.Rows/10))return;imageBox6.Image = chapter2Img;
}
/// <summary>
/// 将图像位数减小，系数为div
/// 此处假设图像为8位RGB图像，减少代码量
/// </summary>
/// <param name="inImg"></param>
/// <param name="div"></param>
/// <returns></returns>
private bool chapter2ColorReduce(Mat inImg,int div=64)
{int nc = inImg.Cols;int nr = inImg.Rows;if (inImg.IsEmpty)return false;Image<Bgr, byte> tempImg = inImg.ToImage<Bgr, byte>();for(int i=0;i<nr;++i)for(int j=0;j<nc;++j){tempImg.Data[i, j, 0] = (byte)(tempImg.Data[i, j, 0] / div * div + div / 2);tempImg.Data[i, j, 1] = (byte)(tempImg.Data[i, j, 1] / div * div + div / 2);tempImg.Data[i, j, 2] = (byte)(tempImg.Data[i, j, 2] / div * div + div / 2);}tempImg.Mat.CopyTo(inImg);return true;
}
private void button21_Click(object sender, EventArgs e)
{if (chapter1OFD.ShowDialog() == DialogResult.OK)chapter2Img = CvInvoke.Imread(chapter1OFD.FileName, LoadImageType.AnyColor | LoadImageType.AnyDepth);if (chapter2Img.IsEmpty)return;imageBox7.Image = chapter2Img;}private void button20_Click(object sender, EventArgs e)
{sw.Start();var tempImg = chapter2Img.Clone();if (!chapter2ColorReduce(tempImg,(int)numericUpDown1.Value))return;imageBox7.Image = tempImg;sw.Stop();textBox2.Text += "\n" + sw.ElapsedMilliseconds.ToString();
}private void button22_Click(object sender, EventArgs e)
{sw.Start();if (chapter2Img.IsEmpty)return;var tempImg = chapter2Img.ToImage<Bgr, byte>();unsafe{int nr = tempImg.Rows;int ncol = tempImg.Cols;int nc = tempImg.NumberOfChannels;int stride = tempImg.MIplImage.WidthStep;byte* data = (byte*)tempImg.MIplImage.ImageData;int div = (int)numericUpDown1.Value;for (int i=0;i<nr;++i){for(int j=0;j< stride; ++j){data[j] = (byte)(data[j] / div * div + div / 2);}data += stride;}sw.Stop();}imageBox7.Image = tempImg;sw.Stop();textBox2.Text += "\n          " + sw.ElapsedMilliseconds.ToString();
}