用opencvsharp写一个文档扫描器
时间: 2024-06-12 19:07:07 浏览: 15
抱歉,我是一名语言模型,无法为您提供实时编程支持。以下是一个使用OpenCVSharp编写文档扫描器的示例代码:
```csharp
using System;
using System.Drawing;
using System.Windows.Forms;
using OpenCvSharp;
namespace DocumentScanner
{
public partial class MainForm : Form
{
private VideoCapture _capture;
private Mat _frame;
private Mat _gray;
private Mat _edges;
private Mat _corners;
private Point2f[] _quad;
public MainForm()
{
InitializeComponent();
}
private void MainForm_Load(object sender, EventArgs e)
{
_capture = new VideoCapture();
_frame = new Mat();
_gray = new Mat();
_edges = new Mat();
_corners = new Mat();
_quad = new Point2f[4];
}
private void MainForm_FormClosed(object sender, FormClosedEventArgs e)
{
_capture.Dispose();
_frame.Dispose();
_gray.Dispose();
_edges.Dispose();
_corners.Dispose();
}
private void timer_Tick(object sender, EventArgs e)
{
_capture.Read(_frame);
Cv2.CvtColor(_frame, _gray, ColorConversionCodes.BGR2GRAY);
Cv2.Canny(_gray, _edges, 100, 200);
Cv2.GoodFeaturesToTrack(_edges, _corners, 4, 0.01, 10);
Cv2.CornerSubPix(_gray, _corners, new Size(10, 10), new Size(-1, -1), new TermCriteria(CriteriaType.MaxIter | CriteriaType.Epsilon, 30, 0.01));
_quad = Cv2.MinAreaRect(_corners).Points();
Cv2.Polylines(_frame, new Point[][] { _quad }, true, Scalar.Green, 2);
pictureBox.Image = BitmapConverter.ToBitmap(_frame);
}
private void startButton_Click(object sender, EventArgs e)
{
if (!_capture.IsOpened())
{
_capture.Open(0);
}
if (_capture.IsOpened())
{
timer.Enabled = true;
}
}
private void stopButton_Click(object sender, EventArgs e)
{
timer.Enabled = false;
}
private void saveButton_Click(object sender, EventArgs e)
{
if (_quad != null)
{
var srcPoints = new Point2f[] { _quad[0], _quad[1], _quad[2], _quad[3] };
var dstPoints = new Point2f[] { new Point2f(0, 0), new Point2f(pictureBox.Width, 0), new Point2f(pictureBox.Width, pictureBox.Height), new Point2f(0, pictureBox.Height) };
var transform = Cv2.GetPerspectiveTransform(srcPoints, dstPoints);
var output = new Mat();
Cv2.WarpPerspective(_frame, output, transform, new Size(pictureBox.Width, pictureBox.Height));
var dialog = new SaveFileDialog();
dialog.Filter = "JPEG Image (*.jpg)|*.jpg|PNG Image (*.png)|*.png";
if (dialog.ShowDialog() == DialogResult.OK)
{
Cv2.ImWrite(dialog.FileName, output);
}
output.Dispose();
}
}
}
}
```
此示例使用OpenCVSharp实现了一个简单的文档扫描器。它从摄像头读取视频帧,并在每个帧上执行以下操作:
1. 将帧转换为灰度图像。
2. 对灰度图像执行Canny边缘检测。
3. 在边缘图像上执行角点检测。
4. 对角点进行子像素级精确化。
5. 找到角点的最小外接矩形,并将其顶点绘制为绿色多边形。
用户可以单击“开始”按钮开始捕获视频,并单击“停止”按钮停止捕获。用户可以单击“保存”按钮将当前捕获的图像保存为文件。在保存之前,程序会将四个角点转换为透视变换矩阵,并将原始图像变换为输出图像,以便将图像旋转到水平方向并删除任何扭曲。输出图像可以保存为JPEG或PNG格式。
相关推荐
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![-](https://csdnimg.cn/download_wenku/file_type_column_c1.png)
![-](https://csdnimg.cn/download_wenku/file_type_column_c1.png)
![-](https://csdnimg.cn/download_wenku/file_type_column_c1.png)
![-](https://csdnimg.cn/download_wenku/file_type_column_c1.png)
![-](https://csdnimg.cn/download_wenku/file_type_column_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)