目录

效果

模型信息

项目

代码

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C# OpenCvSharp DNN Yolov8-OBB 旋转目标检测

效果

模型信息

Model Properties
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date：2024-02-26T08:38:44.171849
description：Ultralytics YOLOv8s-obb model trained on runs/DOTAv1.0-ms.yaml
author：Ultralytics
task：obb
license：AGPL-3.0 https://ultralytics.com/license
version：8.1.18
stride：32
batch：1
imgsz：[640, 640]
names：{0: 'plane', 1: 'ship', 2: 'storage tank', 3: 'baseball diamond', 4: 'tennis court', 5: 'basketball court', 6: 'ground track field', 7: 'harbor', 8: 'bridge', 9: 'large vehicle', 10: 'small vehicle', 11: 'helicopter', 12: 'roundabout', 13: 'soccer ball field', 14: 'swimming pool'}
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Inputs
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name：images
tensor：Float[1, 3, 640, 640]
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Outputs
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name：output0
tensor：Float[1, 20, 8400]
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项目

代码

using OpenCvSharp;
using OpenCvSharp.Dnn;
using System;
using System.Collections.Generic;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Windows.Forms;namespace OpenCvSharp_DNN_Demo
{public partial class frmMain : Form{public frmMain(){InitializeComponent();}string fileFilter = "*.*|*.bmp;*.jpg;*.jpeg;*.tiff;*.tiff;*.png";string image_path = "";DateTime dt1 = DateTime.Now;DateTime dt2 = DateTime.Now;string modelpath;string classer_path;List<string> class_names;Net opencv_net;Mat BN_image;Mat image;Mat result_image;string[] class_lables;private void button1_Click(object sender, EventArgs e){OpenFileDialog ofd = new OpenFileDialog();ofd.Filter = fileFilter;if (ofd.ShowDialog() != DialogResult.OK) return;pictureBox1.Image = null;pictureBox2.Image = null;textBox1.Text = "";image_path = ofd.FileName;pictureBox1.Image = new Bitmap(image_path);image = new Mat(image_path);}private void Form1_Load(object sender, EventArgs e){modelpath = "model/yolov8s-obb.onnx";classer_path = "model/lable.txt";opencv_net = CvDnn.ReadNetFromOnnx(modelpath);List<string> str = new List<string>();StreamReader sr = new StreamReader(classer_path);string line;while ((line = sr.ReadLine()) != null){str.Add(line);}class_lables = str.ToArray();image_path = "test_img/1.png";pictureBox1.Image = new Bitmap(image_path);}private  void button2_Click(object sender, EventArgs e){if (image_path == ""){return;}textBox1.Text = "检测中，请稍等……";pictureBox2.Image = null;button2.Enabled = false;Application.DoEvents();image = new Mat(image_path);//图片缩放image = new Mat(image_path);int max_image_length = image.Cols > image.Rows ? image.Cols : image.Rows;Mat max_image = Mat.Zeros(new OpenCvSharp.Size(max_image_length, max_image_length), MatType.CV_8UC3);Rect roi = new Rect(0, 0, image.Cols, image.Rows);image.CopyTo(new Mat(max_image, roi));float[] result_array;float factor = (float)(max_image_length / 640.0);// 将图片转为RGB通道Mat image_rgb = new Mat();Cv2.CvtColor(max_image, image_rgb, ColorConversionCodes.BGR2RGB);Mat resize_image = new Mat();Cv2.Resize(image_rgb, resize_image, new OpenCvSharp.Size(640, 640));BN_image = CvDnn.BlobFromImage(resize_image, 1 / 255.0, new OpenCvSharp.Size(640, 640), new Scalar(0, 0, 0), true, false);//配置图片输入数据opencv_net.SetInput(BN_image);//模型推理，读取推理结果Mat[] outs = new Mat[1] { new Mat() };string[] outBlobNames = opencv_net.GetUnconnectedOutLayersNames().ToArray();dt1 = DateTime.Now;opencv_net.Forward(outs, outBlobNames);dt2 = DateTime.Now;int num_proposal = outs[0].Size(1);int nout = outs[0].Size(2);if (outs[0].Dims > 2){outs[0] = outs[0].Reshape(0, num_proposal);}Mat result_data = new Mat(20, 8400, MatType.CV_32F);result_data = outs[0].T();List<Rect2d> position_boxes = new List<Rect2d>();List<int> class_ids = new List<int>();List<float> confidences = new List<float>();List<float> rotations = new List<float>();// Preprocessing output resultsfor (int i = 0; i < result_data.Rows; i++){Mat classes_scores = new Mat(result_data, new Rect(4, i, 15, 1));OpenCvSharp.Point max_classId_point, min_classId_point;double max_score, min_score;// Obtain the maximum value and its position in a set of dataCv2.MinMaxLoc(classes_scores, out min_score, out max_score,out min_classId_point, out max_classId_point);// Confidence level between 0 ~ 1// Obtain identification box informationif (max_score > 0.25){float cx = result_data.At<float>(i, 0);float cy = result_data.At<float>(i, 1);float ow = result_data.At<float>(i, 2);float oh = result_data.At<float>(i, 3);double x = (cx - 0.5 * ow) * factor;double y = (cy - 0.5 * oh) * factor;double width = ow * factor;double height = oh * factor;Rect2d box = new Rect2d();box.X = x;box.Y = y;box.Width = width;box.Height = height;position_boxes.Add(box);class_ids.Add(max_classId_point.X);confidences.Add((float)max_score);rotations.Add(result_data.At<float>(i, 19));}}// NMS int[] indexes = new int[position_boxes.Count];CvDnn.NMSBoxes(position_boxes, confidences, 0.25f, 0.7f, out indexes);List<RotatedRect> rotated_rects = new List<RotatedRect>();for (int i = 0; i < indexes.Length; i++){int index = indexes[i];float w = (float)position_boxes[index].Width;float h = (float)position_boxes[index].Height;float x = (float)position_boxes[index].X + w / 2;float y = (float)position_boxes[index].Y + h / 2;float r = rotations[index];float w_ = w > h ? w : h;float h_ = w > h ? h : w;r = (float)((w > h ? r : (float)(r + Math.PI / 2)) % Math.PI);RotatedRect rotate = new RotatedRect(new Point2f(x, y), new Size2f(w_, h_), (float)(r * 180.0 / Math.PI));rotated_rects.Add(rotate);}result_image = image.Clone();for (int i = 0; i < indexes.Length; i++){int index = indexes[i];Point2f[] points = rotated_rects[i].Points();for (int j = 0; j < 4; j++){Cv2.Line(result_image, (OpenCvSharp.Point)points[j], (OpenCvSharp.Point)points[(j + 1) % 4], new Scalar(0, 255, 0), 2);}Cv2.PutText(result_image, class_lables[class_ids[index]] + "-" + confidences[index].ToString("0.00"),(OpenCvSharp.Point)points[0], HersheyFonts.HersheySimplex, 0.8, new Scalar(0, 0, 255), 2);}pictureBox2.Image = new Bitmap(result_image.ToMemoryStream());textBox1.Text = "推理耗时:" + (dt2 - dt1).TotalMilliseconds + "ms";button2.Enabled = true;}private void pictureBox2_DoubleClick(object sender, EventArgs e){Common.ShowNormalImg(pictureBox2.Image);}private void pictureBox1_DoubleClick(object sender, EventArgs e){Common.ShowNormalImg(pictureBox1.Image);}}
}

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