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利用ZXing.Net Bindings for EmguCV识别条形码及绘制条形码边框17(C#)

news 2025/7/7 0:31:57

上一篇博文：绘制条形码的效果不是很好：利用Emgucv绘制条形码边框16(C#)-CSDN博客

测试环境：

win11 64位操作系统

visual studio 2022

ZXing.Net.Bindings.EmguCV 0.16.4

测试步骤如下：

1 新建.net framework 4.8的控制台项目，项目名称为：BarCodeDemo，并把项目的目标架构修改为x64的，如下图：

2 通过nuget安装ZXing.Net.Bindings.EmguCV，版本选择0.16.4，如下图：

可以看到会自动把Emgu.CV 4.6.0.5131的版本也一起下载了，这时，还需要在github上下载运行需要的dll，下载链接：

https://github.com/emgucv/emgucv/releases/tag/4.6.0

把这个压缩包下载下来后解压，展开libs目录的runtimes目录

接着展开runtimes目录，如下图：

把win-x64目录的native目录下的文件全部拷贝到项目的运行目录Debug目录下

3 编写代码如下：

using Emgu.CV;
using Emgu.CV.CvEnum;
using Emgu.CV.DepthAI;
using Emgu.CV.Ocl;
using Emgu.CV.Reg;
using Emgu.CV.Structure;
using Emgu.CV.Util;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Security.Policy;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using ZXing;namespace BarCodeDemo
{class Program{static void Main(string[] args){ReadMultiBarCode5("test5.png");Console.ReadLine();}static void ReadMultiBarCode5(string imageFileName){Emgu.CV.Mat capturedFrame = Emgu.CV.CvInvoke.Imread(imageFileName);List<Point[]> pointList= GetBarCodeRectPoint(capturedFrame);if (pointList != null && pointList.Count > 0){DrawRectPoint(capturedFrame, pointList);List<int> list=GetRotateAngle(pointList);if (list != null && list.Count > 0){// 创建一个Stopwatch实例Stopwatch stopwatch = new Stopwatch();// 开始计时stopwatch.Start();List<string> barcodeList=GetBarCodeText(imageFileName, list);foreach (var item in barcodeList){Console.WriteLine("readCode:"+item);}// 停止计时stopwatch.Stop();// 输出耗时Console.WriteLine("costTime: " + stopwatch.ElapsedMilliseconds + " ms");}}//CvInvoke.Polylines(capturedFrame, contours, true, new MCvScalar(0, 255, 0), 5);CvInvoke.Imshow("after_pic", capturedFrame);CvInvoke.WaitKey(0);}/// <summary>/// 获取条码内容/// </summary>/// <param name="imageFileName">图片文件名</param>/// <param name="angelList">旋转角度集合</param>/// <returns></returns>private static List<string> GetBarCodeText(string imageFileName,List<int> angelList){List<string> barCodeTextList = new List<string>();// 加载图像Bitmap bitmap = (Bitmap)System.Drawing.Image.FromFile(imageFileName);object lockObject = new object();Parallel.ForEach(angelList, angle => {Bitmap bitMapCopy = null;lock (lockObject){bitMapCopy = (Bitmap)bitmap.Clone();}// 创建条码读取器BarcodeReader reader = new BarcodeReader();reader.Options.TryHarder = true;reader.Options.PossibleFormats = new List<BarcodeFormat> { BarcodeFormat.CODE_39, BarcodeFormat.CODE_128 };reader.Options.UseCode39ExtendedMode = true;reader.Options.UseCode39RelaxedExtendedMode = true;Bitmap rotatedBitmap = RotateImage(bitMapCopy, angle);var result = reader.DecodeMultiple(rotatedBitmap);if (result != null && result.Length > 0){foreach (var item in result){if (!barCodeTextList.Contains(item.Text)){barCodeTextList.Add(item.Text);}}}});//foreach (var angle in angelList)//{//    Bitmap rotatedBitmap = RotateImage(bitmap, angle);//    var result = reader.DecodeMultiple(rotatedBitmap);//    if (result != null && result.Length > 0)//    {//        foreach (var item in result)//        {//            if (!barCodeTextList.Contains(item.Text))//            {//                barCodeTextList.Add(item.Text);//            }//        }//    }//}return barCodeTextList;}private static Bitmap RotateImage(Bitmap bmp, float angle){Bitmap rotatedImage = new Bitmap(bmp.Width, bmp.Height);using (Graphics g = Graphics.FromImage(rotatedImage)){g.TranslateTransform((float)bmp.Width / 2, (float)bmp.Height / 2);g.RotateTransform(angle);g.TranslateTransform(-(float)bmp.Width / 2, -(float)bmp.Height / 2);g.DrawImage(bmp, new Point(0, 0));}return rotatedImage;}/// <summary>/// 获取条形码的矩形信息/// </summary>/// <param name="capturedFrame"></param>/// <returns></returns>private static List<Point[]> GetBarCodeRectPoint(Emgu.CV.Mat capturedFrame){Mat dstMat = new Mat();//原图先转灰度图CvInvoke.CvtColor(capturedFrame, dstMat, Emgu.CV.CvEnum.ColorConversion.Rgb2Gray);CvInvoke.AdaptiveThreshold(dstMat, dstMat, 255, Emgu.CV.CvEnum.AdaptiveThresholdType.GaussianC, Emgu.CV.CvEnum.ThresholdType.BinaryInv, 7, 7);Mat dstDilate = new Mat();Mat dilateElement = CvInvoke.GetStructuringElement(Emgu.CV.CvEnum.ElementShape.Rectangle, new Size(20, 20), new Point(-1, -1));//膨胀，核为20*20，搞大点CvInvoke.Dilate(dstMat, dstDilate, dilateElement, new Point(-1, -1), 1, Emgu.CV.CvEnum.BorderType.Default, new MCvScalar(255, 0, 0));//腐蚀Mat erodeElement = CvInvoke.GetStructuringElement(Emgu.CV.CvEnum.ElementShape.Rectangle, new Size(10, 10), new Point(-1, -1));Emgu.CV.CvInvoke.Erode(dstDilate, dstDilate, erodeElement, new Point(-1, -1), 10, BorderType.Default, new MCvScalar(255, 0, 0));Mat dilateAfterElement = CvInvoke.GetStructuringElement(Emgu.CV.CvEnum.ElementShape.Rectangle, new Size(3, 3), new Point(-1, -1));CvInvoke.Dilate(dstDilate, dstDilate, dilateAfterElement, new Point(-1, -1), 10, Emgu.CV.CvEnum.BorderType.Default, new MCvScalar(255, 0, 0));VectorOfVectorOfPoint contours = new VectorOfVectorOfPoint();VectorOfRect hierarchy = new VectorOfRect();//查找轮廓CvInvoke.FindContours(dstDilate, contours, hierarchy, Emgu.CV.CvEnum.RetrType.External, Emgu.CV.CvEnum.ChainApproxMethod.ChainApproxSimple);if (contours.Size > 0){List<Point[]> pointList = new List<Point[]>();for (int i = 0; i < contours.Size; i++){var contour = contours[i];if (contour != null && contour.Size > 0){//获取最小的矩形框var rect = CvInvoke.MinAreaRect(contour);//获取矩形框的点集合PointF[] vertixes = rect.GetVertices();if (vertixes != null && vertixes.Length > 0){Point[] pointArray = new Point[vertixes.Length];for (int j = 0; j < vertixes.Length; j++){pointArray[j] = new Point((int)vertixes[j].X, (int)vertixes[j].Y);}pointList.Add(pointArray);}}}return pointList;}return null;}/// <summary>/// 绘制矩形/// </summary>/// <param name="capturedFrame"></param>/// <param name="pointList"></param>private static void DrawRectPoint(Emgu.CV.Mat capturedFrame, List<Point[]> pointList){foreach (var item in pointList){CvInvoke.Polylines(capturedFrame, item, true, new MCvScalar(0, 255, 0), 10);}}/// <summary>/// 获取要旋转的角度/// </summary>/// <param name="pointList"></param>/// <returns></returns>private static List<int> GetRotateAngle(List<Point[]> pointList){List<int> list = new List<int>();list.Add(180);foreach (var array in pointList){Point minXPoint = array[0];Point maxXPoint = array[0];Point minYPoint = array[0];Point maxYPoint = array[0];int minX = array[0].X;int minY = array[0].Y;int maxX= array[0].X;int maxY= array[0].Y;foreach (var item in array){int X = item.X;int Y = item.Y;if (X < minX){ minX= X;minXPoint.X = X;minXPoint.Y = Y;}if (Y < minY) {minY = Y;minYPoint.X = X;minYPoint.Y = Y;}if (X > maxX){maxX = X;maxXPoint.X = X;maxXPoint.Y = Y;}if (Y > maxY){ maxY= Y;maxYPoint.X = X;maxYPoint.Y = Y;}}double yIndex = (double)(maxYPoint.Y - minXPoint.Y);double xIndex = (double)(maxYPoint.X - minXPoint.X);int angleOfLine = (int)(Math.Atan2(yIndex,xIndex) * 180 / Math.PI);if (!list.Contains(angleOfLine)){list.Add(angleOfLine);list.Add(Math.Abs(180-angleOfLine));}}return list;}}
}

测试用到的test5.png图片如下：