C# 数字图像——直方图均衡化处理等 图片处理 附源码

1.获取图像

if (openFileDialog1.ShowDialog() == DialogResult.OK)
                Picfilename = openFileDialog1.FileName;
            pictureBox1.Image = Image.FromFile(Picfilename);
            bitmap =(Bitmap) pictureBox1.Image;

2.获取灰度图

Bitmap Abitmap = new Bitmap(bitmap.Width, bitmap.Height);
            for (int i = 0; i < bitmap.Width; i++)
            {
                for (int j = 0; j < bitmap.Height; j++)
                {
                    Color c = bitmap.GetPixel(i, j);
                    //灰度加权平均法公式
                    int rgb = (int)(c.R * 0.299 + c.G * 0.587 + c.B * 0.114);
                    Abitmap.SetPixel(i, j, Color.FromArgb(rgb, rgb, rgb));
                }
            }
            pictureBox3.Image = Abitmap.Clone() as Image;

3.直方图均衡化处理

if (bitmap != null)
            {
                newbitmap = bitmap.Clone() as Bitmap; //clone一个副本
                int width = newbitmap.Width;
                int height = newbitmap.Height;
                int size = width*height;
                //总像数个数
                int[] gray = new int[256];
                //定义一个int数组，用来存放各像元值的个数
                double[] graydense = new double[256];
                //定义一个float数组，存放每个灰度像素个数占比
                for (int i = 0; i < width; ++i)
                    for (int j = 0; j < height; ++j)
                    {
                        Color pixel = newbitmap.GetPixel(i, j);
                        //计算各像元值的个数
                        gray[Convert.ToInt16(pixel.R)] += 1;
                        //由于是灰度只读取R值
                    }
                for (int i = 0; i < 256; i++)
                {
                    graydense[i] = (gray[i]*1.0)/size;
                    //每个灰度像素个数占比
                }

                for (int i = 1; i < 256; i++)
                {
                    graydense[i] = graydense[i] + graydense[i - 1];
                    //累计百分比
                }

                for (int i = 0; i < width; ++i)
                    for (int j = 0; j < height; ++j)
                    {
                        Color pixel = newbitmap.GetPixel(i, j);
                        int oldpixel = Convert.ToInt16(pixel.R); //原始灰度
                        int newpixel = 0;
                        if (oldpixel == 0)
                            newpixel = 0;
                        //如果原始灰度值为0则变换后也为0
                        else
                            newpixel = Convert.ToInt16(graydense[Convert.ToInt16(pixel.R)]*255);
                        //如果原始灰度不为0，则执行变换公式为   <新像元灰度 = 原始灰度 * 累计百分比>
                        pixel = Color.FromArgb(newpixel, newpixel, newpixel);
                        newbitmap.SetPixel(i, j, pixel); //读入newbitmap
                    }
                pictureBox2.Image = newbitmap.Clone() as Image; //显示至pictureBox2

            }

效果图:

源码:

链接：https://pan.baidu.com/s/1eTOowWdRQuQqhdLkGEx85w 
提取码：ben8