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使用本文代码需要预先设置一点开发环境#xff0c;请阅读另外一篇博文#xff1a;
C#图像处理OpenCV开发指南#xff08;CVStar#xff0c;03#xff09;——基于.NET 6的图像处理桌面程序开发实践第一步https://blog.csdn.net/beijinghorn/article/deta…
使用本文代码需要预先设置一点开发环境请阅读另外一篇博文
C#图像处理OpenCV开发指南CVStar03——基于.NET 6的图像处理桌面程序开发实践第一步https://blog.csdn.net/beijinghorn/article/details/134684471?spm1001.2014.3001.5502 1 功能需求
1读取图片并显示于窗口可缩放
2可访问图片指定位置像素信息
3提取局部图片ROI
4有 拾取框
5局部放大连续型放大
6支持 大像素 型得局部放大
7支持 圆形 像素的局部放大 2 代码分段讲解 前面一个博文中出现过的代码不再赘述。 2.1 访问图片指定位置像素信息
Vec3b cx zmt.AtVec3b(y, x);
y,x 指定的位置顺序不要搞错啦
返回的数据类型 Vec3b 是 byte[] 类型的BGR顺序cx[0] 为 Bluecx[1] 为 Greencx[2] 为 Red这个与一般的图片信息 RGB 顺序不同 2.2 提取局部图片ROI
Mat zmt new Mat(src, new Rect(gx, gy, gw, gh));
gx,gy 为左上角坐标
gw,gh 为局部图片的宽度与高度像素。 2.3 拾取框绘制
int gw picResult.Width / PixelSize;
int gh picResult.Height / PixelSize;
Bitmap bmp new Bitmap(picSource.Width, picSource.Height);
Graphics g Graphics.FromImage(bmp);
g.DrawImage(image: img,destRect: new Rectangle(0, 0, bmp.Width, bmp.Height),srcX: 0,srcY: 0,srcWidth: img.Width,srcHeight: img.Height,srcUnit: GraphicsUnit.Pixel);
g.DrawRectangle(new Pen(Color.Yellow), mouseAtX - gw / 2, mouseAtY - gh / 2, gw, gh);
picSource.Image bmp;2.4 光滑的插值的局部放大
图片的局部放大是取局部图片放大显示。或者直接将图片放大显示并进行移位。
非 OpenCV 方式
Bitmap bmp new Bitmap(picResult.Width, picResult.Height);
Graphics g Graphics.FromImage(bmp);
g.DrawImage(image: picSource.Image,destRect: new Rectangle(0, 0, bmp.Width, bmp.Height),srcX: gx,srcY: gy,srcWidth: gw,srcHeight: gh,srcUnit: GraphicsUnit.Pixel);
picResult.Image bmp;OpenCV方式
Mat zmt new Mat(src, new Rect(gx, gy, gw, gh));
picResult.Image CVUtility.Mat2Bitmap(zmt);
PicAutosize(picResult);2.5 非插值的大像素型放大
非插值的大像素型放大是指将原图的每个像素放大为一个矩形块显示。
Mat zmt new Mat(src, new Rect(gx, gy, gw, gh));
Bitmap bmp new Bitmap(picResult.Width, picResult.Height);
Graphics g Graphics.FromImage(bmp);
g.InterpolationMode System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.CompositingQuality System.Drawing.Drawing2D.CompositingQuality.HighQuality;
for (int y 0; y gh; y)
{for (int x 0; x gw; x){Vec3b cx zmt.AtVec3b(y, x);SolidBrush sb new SolidBrush(Color.FromArgb(cx[2], cx[1], cx[0]));g.FillRectangle(sb, new Rectangle(x * PixelSize, y * PixelSize, PixelSize, PixelSize));}
}
picResult.Image bmp;2.6 圆圈型像素放大算法
圆圈型像素放大算法是指将原图的每个像素放大为一个圆圈派显示。
Mat zmt new Mat(src, new Rect(gx, gy, gw, gh));
Bitmap bmp new Bitmap(picResult.Width, picResult.Height);
Graphics g Graphics.FromImage(bmp);
g.InterpolationMode System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
g.CompositingQuality System.Drawing.Drawing2D.CompositingQuality.HighQuality;
for (int y 0; y gh; y)
{for (int x 0; x gw; x){Vec3b cx zmt.AtVec3b(y, x);SolidBrush sb new SolidBrush(Color.FromArgb(cx[2], cx[1], cx[0]));g.FillEllipse(sb, new Rectangle(x * PixelSize, y * PixelSize, PixelSize, PixelSize));}
}
picResult.Image bmp;2.7 鼠标事件与拾取框
private void PicSource_MouseMove(object? sender, MouseEventArgs? e)
{if (picSource null) { return; }if (picSource.Image null) { return; }mouseAtX e.X;mouseAtY e.Y;abLocation.Text mouseAtX , mouseAtY (int)(mouseAtX / original_scale) , (int)(mouseAtY / original_scale);int gw picResult.Width / PixelSize;int gh picResult.Height / PixelSize;Bitmap bmp new Bitmap(picSource.Width, picSource.Height);Graphics g Graphics.FromImage(bmp);g.DrawImage(image: img,destRect: new Rectangle(0, 0, bmp.Width, bmp.Height),srcX: 0,srcY: 0,srcWidth: img.Width,srcHeight: img.Height,srcUnit: GraphicsUnit.Pixel);g.DrawRectangle(new Pen(Color.Yellow), mouseAtX - gw / 2, mouseAtY - gh / 2, gw, gh);picSource.Image bmp;Zoom();
}3 运行效果
3.1 一般的插值放大算法效果 3.2 块状大像素放大效果 3.3 圆圈像素放大效果 4 完整的源代码
无需做修改界面设计直接复制粘贴替换原来的 Form1.cs 即可。
using OpenCvSharp;#pragma warning disable CS8602namespace Legal.Truffer.CVStar
{public partial class Form1 : Form{string[] ImgExtentions {*.*|*.*,JPEG|*.jpg;*.jpeg,GIF|*.gif,PNG|*.png,TIF|*.tif;*.tiff,BMP|*.bmp};private int original_width { get; set; } 0;private int original_height { get; set; } 0;private double original_scale { get; set; } 0.0;private string sourceImage { get; set; } ;private int PixelSize { get; set; } 15;private int mouseAtX { get; set; } 0;private int mouseAtY { get; set; } 0;Panel? panelTop { get; set; } null;Panel? panelBotton { get; set; } null;PictureBox? picSource { get; set; } null;PictureBox? picResult { get; set; } null;Button? btnLoad { get; set; } null;RadioButton? rbSmooth { get; set; } null;RadioButton? rbBlock { get; set; } null;RadioButton? rbPie { get; set; } null;Label? abLocation { get; set; }Image? img { get; set; } null;Mat? src { get; set; } null;public Form1(){InitializeComponent();this.Text OPENCV C#编程入手教程 POWERED BY 深度混淆CSDN.NET;this.StartPosition FormStartPosition.CenterScreen;GUI();this.Resize FormResize;this.DoubleBuffered true;}private void FormResize(object? sender, EventArgs? e){if (this.Width 200) { this.Width 320; return; }if (this.Height 200) { this.Height 320; return; }mouseAtX 0;mouseAtY 0;GUI();}private void GUI(){if (panelTop null) panelTop new Panel();panelTop.Parent this;panelTop.Top 5;panelTop.Left 5;panelTop.Height 75;panelTop.Dock DockStyle.Top;panelTop.BorderStyle BorderStyle.FixedSingle;panelTop.BackColor Color.FromArgb(220, 220, 255);if (panelBotton null) panelBotton new Panel();panelBotton.Parent this;panelBotton.Top panelTop.Top panelTop.Height 1;panelBotton.Left 0;panelBotton.Width panelTop.Width;panelBotton.Height this.Height - panelBotton.Top - 55;panelBotton.BorderStyle BorderStyle.FixedSingle;if (picSource null) picSource new PictureBox();picSource.Parent panelBotton;picSource.Left 5;picSource.Top 5;picSource.Width (panelBotton.Width - 10) / 2;picSource.Height (panelBotton.Height - 10);picSource.BorderStyle BorderStyle.FixedSingle;picSource.MouseMove PicSource_MouseMove;picSource.DoubleClick Load_Image;original_width picSource.Width;original_height picSource.Height;if (picResult null) picResult new PictureBox();picResult.Parent panelBotton;picResult.Left picSource.Left picSource.Width 5;picResult.Top picSource.Top;picResult.Width picSource.Width - (picSource.Width % PixelSize);picResult.Height picResult.Width;picResult.BorderStyle BorderStyle.FixedSingle;if (btnLoad null) btnLoad new Button();btnLoad.Parent panelTop;btnLoad.Left 5;btnLoad.Top 5;btnLoad.Width 90;btnLoad.Height 38;btnLoad.Cursor Cursors.Hand;btnLoad.Text Load;btnLoad.BackColor Color.FromArgb(255, 110, 0);btnLoad.Click Load_Image;if (rbSmooth null) rbSmooth new RadioButton();rbSmooth.Parent panelTop;rbSmooth.Left btnLoad.Left btnLoad.Width 5;rbSmooth.Top btnLoad.Top 5;rbSmooth.Text smooth;rbSmooth.Cursor Cursors.Hand;rbSmooth.Checked true;if (rbBlock null) rbBlock new RadioButton();rbBlock.Parent panelTop;rbBlock.Left rbSmooth.Left rbSmooth.Width 5;rbBlock.Top btnLoad.Top 5;rbBlock.Text block;rbBlock.Cursor Cursors.Hand;if (rbPie null) rbPie new RadioButton();rbPie.Parent panelTop;rbPie.Left rbBlock.Left rbBlock.Width 5;rbPie.Top btnLoad.Top 5;rbPie.Text pie;rbPie.Cursor Cursors.Hand;if (abLocation null) abLocation new Label();abLocation.Parent panelTop;abLocation.Left btnLoad.Left;abLocation.Top btnLoad.Top btnLoad.Height 5;abLocation.Text mouseAtX , mouseAtY;PicAutosize(picSource);Zoom();}private void Load_Image(object? sender, EventArgs? e){OpenFileDialog openFileDialog new OpenFileDialog();openFileDialog.Filter String.Join(|, ImgExtentions);if (openFileDialog.ShowDialog() DialogResult.OK){sourceImage openFileDialog.FileName;img Image.FromFile(sourceImage);picSource.Image img;src Cv2.ImRead(sourceImage);PicAutosize(picSource);Zoom();}}private void PicAutosize(PictureBox pb){if (pb null) return;if (pb.Image null) return;Image img pb.Image;int w original_width;int h w * img.Height / img.Width;if (h original_height){h original_height;w h * img.Width / img.Height;}if (pb picSource){original_scale (double)w / (double)src.Width;}pb.SizeMode PictureBoxSizeMode.Zoom;pb.Width w;pb.Height h;pb.Image img;pb.Refresh();}private void Zoom(){if (picSource null) return;if (picSource.Image null) return;// ROIint gw picResult.Width / PixelSize;int gh picResult.Height / PixelSize;int gx (int)(mouseAtX / original_scale) - gw / 2;if (gx 0) gx 0;int gy (int)(mouseAtY / original_scale) - gh / 2;if (gy 0) gy 0;if (rbSmooth.Checked){
#if GRAPHICS_METHODBitmap bmp new Bitmap(picResult.Width, picResult.Height);Graphics g Graphics.FromImage(bmp);g.DrawImage(image: picSource.Image,destRect: new Rectangle(0, 0, bmp.Width, bmp.Height),srcX: gx,srcY: gy,srcWidth: gw,srcHeight: gh,srcUnit: GraphicsUnit.Pixel);picResult.Image bmp;
#elseMat zmt new Mat(src, new Rect(gx, gy, gw, gh));picResult.Image CVUtility.Mat2Bitmap(zmt);PicAutosize(picResult);
#endif}else if (rbBlock.Checked){Mat zmt new Mat(src, new Rect(gx, gy, gw, gh));Bitmap bmp new Bitmap(picResult.Width, picResult.Height);Graphics g Graphics.FromImage(bmp);g.InterpolationMode System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;g.CompositingQuality System.Drawing.Drawing2D.CompositingQuality.HighQuality;for (int y 0; y gh; y){for (int x 0; x gw; x){Vec3b cx zmt.AtVec3b(y, x);SolidBrush sb new SolidBrush(Color.FromArgb(cx[2], cx[1], cx[0]));g.FillRectangle(sb, new Rectangle(x * PixelSize, y * PixelSize, PixelSize, PixelSize));}}picResult.Image bmp;}else if (rbPie.Checked){Mat zmt new Mat(src, new Rect(gx, gy, gw, gh));Bitmap bmp new Bitmap(picResult.Width, picResult.Height);Graphics g Graphics.FromImage(bmp);g.InterpolationMode System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;g.CompositingQuality System.Drawing.Drawing2D.CompositingQuality.HighQuality;for (int y 0; y gh; y){for (int x 0; x gw; x){Vec3b cx zmt.AtVec3b(y, x);SolidBrush sb new SolidBrush(Color.FromArgb(cx[2], cx[1], cx[0]));g.FillEllipse(sb, new Rectangle(x * PixelSize, y * PixelSize, PixelSize, PixelSize));}}picResult.Image bmp;}}private void PicSource_MouseMove(object? sender, MouseEventArgs? e){if (picSource null) { return; }if (picSource.Image null) { return; }mouseAtX e.X;mouseAtY e.Y;abLocation.Text mouseAtX , mouseAtY (int)(mouseAtX / original_scale) , (int)(mouseAtY / original_scale);int gw picResult.Width / PixelSize;int gh picResult.Height / PixelSize;Bitmap bmp new Bitmap(picSource.Width, picSource.Height);Graphics g Graphics.FromImage(bmp);g.DrawImage(image: img,destRect: new Rectangle(0, 0, bmp.Width, bmp.Height),srcX: 0,srcY: 0,srcWidth: img.Width,srcHeight: img.Height,srcUnit: GraphicsUnit.Pixel);g.DrawRectangle(new Pen(Color.Yellow), mouseAtX - gw / 2, mouseAtY - gh / 2, gw, gh);picSource.Image bmp;Zoom();}}
}
