C#使用OpenCVSharp实现图片的美白

最近在做员工制卡，需要拍照，但是照片有点暗，所以就想用Opencv的拉普拉斯变换增强图像，下面是使用c#下的OpencvSharp. 可以自行下载相关的DLL文件

using AForge.Video.DirectShow;

using System;
using System.Drawing;
using System.IO;
using System.Text;
using System.Windows.Forms;
using IDCard.Service;
using System.Media;
using IDCard.Model;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Drawing.Printing;
using System.Data;
using OpenCvSharp;
using OpenCvSharp.Dnn;
using OpenCvSharp.Extensions;

namespace IDCard
{
    public partial class FrmMain : Form
    {
        private CameraHelper Capture = new CameraHelper();

        private VideoCapture cap ;
        
        private Mat src1 = new Mat();

        private int currentPageIndex = 0;
        private int rowCount = 0;
        private int pageCount = 0;

        public string param;
        FilterInfoCollection videoDevices;

        [DllImport("shell32.dll")]
        public extern static int ShellAbout(IntPtr hWnd, string szApp, string szOtherStuff, IntPtr hIcon);
        // DrawCanvas canvas;
        public FrmMain()
        {
            InitializeComponent();
           // Setting.GetPhotoFolder();
        } 

 

        private void CameraConn()
        { 

            int CameraIndex = cbbCameraList.SelectedIndex;
            VideoCaptureDevice videoSource = new VideoCaptureDevice(videoDevices[CameraIndex].MonikerString);
            videoSource.DesiredFrameRate = 1;
            videoSource.DesiredFrameSize = new System.Drawing.Size(1280, 720);
            //videoSource.DesiredFrameRate = 1;
            try
            {
                for(int x = 0; x < videoSource.VideoCapabilities.Length;x++)
                {
                    System.Drawing.Size DefaultSize = new System.Drawing.Size(1280, 720);
                    System.Drawing.Size size = videoSource.VideoCapabilities[x].FrameSize;
                    if (size == DefaultSize)
                    {
                        videoSource.VideoResolution = videoSource.VideoCapabilities[x];
                        break;
                    }
                }
                
            }catch(Exception ex)
            {
                videoSource.VideoResolution = videoSource.VideoCapabilities[8];
            }
            
 
            videPlayer1.VideoSource = videoSource;
            videPlayer1.Start();


        }

        private void CameraClose()
        {
            videPlayer1.SignalToStop();
            videPlayer1.WaitForStop();

            if (videPlayer1.IsRunning)
            { 
                videPlayer1.Stop(); 
            }
        }

        private string GetImagePath()
        {
            string personImgPath = Path.GetDirectoryName(AppDomain.CurrentDomain.BaseDirectory)
                         + Path.DirectorySeparatorChar.ToString() + "PersonImg";
            if (!Directory.Exists(personImgPath))
            {
                Directory.CreateDirectory(personImgPath);
            }

            return personImgPath;
        }

        private void btnCameraConn_Click(object sender, EventArgs e)
        {
            if (videPlayer1.IsRunning)
            {
                btnCameraConn.Text = "连接";
                videPlayer1.SignalToStop();
                videPlayer1.WaitForStop();
                cbbCameraList.Enabled = true;
            }
            else
            {
                CameraConn();
                btnCameraConn.Text = "关闭";
                cbbCameraList.Enabled = false;
            }           
        }
  

        private void button2_Click(object sender, EventArgs e)
        {
            Mat src1 = new Mat();
            Mat src2 = new Mat();

            Capture.Captuer.Read(src1); 

            float[,] myLengthsArray = new float[3,3] { { 0, -1, 0 }, { 0.1F, 3.33F, 0 }, { 0, -1, 0 } };

            Mat imageEnhance = new Mat();// Array ;
            Mat kernel = new Mat(3,3,MatType.CV_32F, myLengthsArray);// Scalar.;//= (Mat<float>(3, 3) << 0, -1, 0, 0, 5, 0, 0, -1, 0);
            Cv2.Filter2D(src1, imageEnhance, MatType.CV_8UC3, kernel);

            Cv2.ImShow("src1", src1);
            Cv2.ImShow("src3", imageEnhance);

            src1.SaveImage(@"D:\MyProgram\windows\IDCard\IDCard\IDCard\Image\src1.png");
            imageEnhance.SaveImage(@"D:\MyProgram\windows\IDCard\IDCard\IDCard\Image\src3.png");
        }
 

        private void pbCamera_Paint(object sender, PaintEventArgs e)
        {
            System.Drawing.Graphics g = e.Graphics;
            System.Drawing.Pen pen = new System.Drawing.Pen(System.Drawing.Brushes.LightGreen, 4); // 创建一个红色，宽度为2的画笔
            float x1 = 170f, y1 = 60f, x2 = 330f, y2 = 260f;
            g.DrawLine(pen, x1, y1, x2, y1);
            g.DrawLine(pen, x1, y1, x1, y2);
            g.DrawLine(pen, x2, y1, x2, y2);
            g.DrawLine(pen, x1, y2, x2, y2);
            Font font = FrmMain.DefaultFont;//  "微软雅黑";
            Brush bursh = Brushes.Red;
            g.DrawString("请将头像放置在框内", font, bursh, 190f, 10f);

            try
            {
                RectangleF rectMan = new RectangleF(120, 65, 260, 260);
                g.DrawImage(Image.FromFile(Application.StartupPath + @"\Image\man2.png"), rectMan);

                RectangleF rectLeftEye = new RectangleF(210, 135, 20, 20);
                g.DrawImage(Image.FromFile(Application.StartupPath + @"\Image\Eye_Invisible_128px.png"), rectLeftEye);

                RectangleF rectRightEye = new RectangleF(270, 135, 20, 20);
                g.DrawImage(Image.FromFile(Application.StartupPath + @"\Image\Eye_Invisible_128px.png"), rectRightEye);
            }
            catch (Exception ex)
            {
                Upgrade.DownloadImageFile();
                Common.Common.LOG.WriteErrorLog(ex.Message);

            }
        }
    }
}









using OpenCvSharp;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace IDCard.Service
{
    public class CameraHelper
    {
        public VideoCapture Captuer;

        public void OpenCamera(int CameraIndex)
        {
            Captuer = new VideoCapture(CameraIndex);
            try
            {
                Captuer.Set(CaptureProperty.FrameWidth, 1280);
                Captuer.Set(CaptureProperty.FrameHeight, 720);
                
            }
            catch
            {
                Captuer.Set(CaptureProperty.FrameWidth, 640);
                Captuer.Set(CaptureProperty.FrameHeight, 480);
            }

        }

        public void CloseCamera()
        {
            Captuer.Release();
        }

    }
}