Asa_OpenCV.cs
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using OpenCvSharp;
using System;
using System.Drawing;
using System.Collections.Generic;
namespace Asa
{
public class OpenCV
{
/// <summary>
/// 提取矩形轮廓
/// </summary>
/// <param name="bmp"></param>
/// <returns></returns>
public List<AreaRect> extractRect(Bitmap bmp)
{
Mat src = OpenCvSharp.Extensions.BitmapConverter.ToMat(bmp);
Mat gray = src.CvtColor(ColorConversionCodes.BGR2GRAY, 1);
Cv2.PyrDown(gray, gray); //模糊
//Cv2.PyrDown(src, src);
//Cv2.MedianBlur(gray, gray, 3); //中值滤波
//Cv2.Threshold(gray, gray, 200, 255, ThresholdTypes.Tozero);
//Cv2.NamedWindow("qqq", WindowMode.Normal);
//gray.PyrDown();
//Cv2.ImShow("qqq", gray);
//Cv2.Sobel(gray, gray, MatType.CV_16S, 0, 1);
//Cv2.Sobel(gray, gray, MatType.CV_16S, 1, 0);
Cv2.Canny(gray, gray, 20, 128); //边缘 20,128
//ShowImg("canny", gray);
Mat[] contours = null;
Mat hierarchy = new Mat();
Cv2.FindContours(gray, out contours, hierarchy, RetrievalModes.CComp, ContourApproximationModes.ApproxSimple); //寻找轮廓
List<AreaRect> rtn = new List<AreaRect>();
bool repeat = false;
for (int index = 0; index < contours.Length; index++)
{
RotatedRect rect = Cv2.MinAreaRect(contours[index]);
//去除过大过小的矩形
if (rect.Size.Height < 100 || rect.Size.Width < 100) continue;
if (rect.Size.Height > bmp.Height / 3 || rect.Size.Width > bmp.Width / 3) continue;
AreaRect ar = new AreaRect();
ar.Center = new PointF(rect.Center.X * 2, rect.Center.Y * 2);
ar.Size = new SizeF(rect.Size.Width, rect.Size.Height);
ar.Angle = rect.Angle;
Point2f[] pf = rect.Points();
ar.Points = new PointF[pf.Length];
for (int i = 0; i < pf.Length; i++)
ar.Points[i] = new PointF(pf[i].X * 2, pf[i].Y * 2);
//找重复
repeat = false;
for (int i = 0; i < rtn.Count; i++)
{
if (Math.Abs(ar.Center.X - rtn[i].Center.X) < 10 &&
Math.Abs(ar.Center.Y - rtn[i].Center.Y) < 10 &&
Math.Abs(ar.Size.Width - rtn[i].Size.Width) < 10 &&
Math.Abs(ar.Size.Height - rtn[i].Size.Height) < 10 &&
Math.Abs(ar.Angle - rtn[i].Angle) < 5
)
{
repeat = true;
continue;
}
}
if (!repeat) rtn.Add(ar);
}
return rtn;
//Cv2.GetRotationMatrix2D()
}
//public class faadfsadf
//{
// public void extractRec(string imagePath)
// {
// Mat src = new Mat(imagePath, ImreadModes.GrayScale);
// Mat originalImg = new Mat(imagePath, ImreadModes.AnyColor);
// Cv2.PyrDown(src, src); //模糊
// Cv2.PyrDown(originalImg, originalImg);
// Cv2.MedianBlur(src, src, 3); //中值滤波
// //Cv2.Threshold(src, src, 50, 255, ThresholdTypes.BinaryInv);
// Cv2.Canny(src, src, 20, 128); //边缘
// ShowImg("canny", src);
// Mat[] contours = null;
// Mat hierarchy = new Mat();
// Cv2.FindContours(src, out contours, hierarchy, RetrievalModes.External, ContourApproximationModes.ApproxSimple); //寻找轮廓
// //Mat linePic = Mat.Zeros(src.Rows, src.Cols, MatType.CV_8UC3);
// int contoursSize = contours.Length;
// int n = 0;
// for (int index = 0; index < contoursSize; index++)
// {
// //Cv2.DrawContours(linePic, contours, index, Scalar.RandomColor());
// //找出完整包含轮廓的最小矩形
// //Rect rect = Cv2.BoundingRect(contours[index]);
// RotatedRect rect = Cv2.MinAreaRect(contours[index]);
// if (rect.Size.Height < 100 || rect.Size.Width < 100)
// {
// continue;
// }
// //Cv2.Rectangle(originalImg, rect, Scalar.Red);
// Point2f[] pf = rect.Points();
// Point[] ps = new Point[pf.Length];
// for (int i = 0; i < pf.Length; i++)
// {
// ps[i] = new Point(pf[i].X, pf[i].Y);
// }
// Cv2.Line(originalImg, ps[0], ps[1], Scalar.Red);
// Cv2.Line(originalImg, ps[1], ps[2], Scalar.Red);
// Cv2.Line(originalImg, ps[2], ps[3], Scalar.Red);
// Cv2.Line(originalImg, ps[3], ps[0], Scalar.Red);
// n++;
// }
// ShowImg("Line", originalImg);
// return;
// Mat[] polyContours = new Mat[contoursSize];
// double maxArea = 0;
// int maxAreaIndex = 0;
// for (int index = 0; index < contoursSize; index++)
// {
// Mat contour = contours[index];
// double currentArea = Cv2.ContourArea(contour);
// if (currentArea > maxArea)
// {
// maxAreaIndex = index;
// maxArea = currentArea;
// }
// Mat polyMat = Mat.Zeros(src.Size(), MatType.CV_8UC3);
// Cv2.ApproxPolyDP(contour, polyMat, 10, true);
// polyContours[index] = polyMat;
// Rect rect = Cv2.BoundingRect(polyContours[index]);
// originalImg.Rectangle(rect, Scalar.Red);
// //if (approx.size() == 4 &&
// // fabs(contourArea(Mat(approx))) > 1000 &&
// // isContourConvex(Mat(approx)))
// //{
// // double maxCosine = 0;
// // for (int j = 2; j < 5; j++)
// // {
// // double cosine = fabs(angle(approx[j % 4], approx[j - 2], approx[j - 1]));
// // maxCosine = MAX(maxCosine, cosine);
// // }
// // if (maxCosine < 0.3)
// // squares.push_back(approx);
// //}
// }
// //Mat polyPic = Mat.Zeros(src.Size(),MatType.CV_32SC2);
// //Cv2.DrawContours(polyPic, polyContours,maxAreaIndex,Scalar.Red);
// //Cv2.DrawContours(dst, polyContours, maxAreaIndex, Scalar.Red,2);
// Rect rec = Cv2.BoundingRect(polyContours[maxAreaIndex]);
// //originalImg.Rectangle(rec, Scalar.Red) ;
// ShowImg("Rec", originalImg);
// //originalImg.Rectangle(new Rect(rec.X* 2, rec.Y* 2, rec.Width * 2, rec.Height *2), Scalar.Red);
// //投影变换
// Point2f[] srcPoints = new Point2f[4];
// //左上，右上，右下,左下
// srcPoints[0] = new Point2f(rec.TopLeft.X * 2, rec.TopLeft.Y * 2);
// srcPoints[1] = new Point2f(rec.Right * 2, rec.Top * 2);
// srcPoints[2] = new Point2f(rec.BottomRight.X * 2, rec.BottomRight.Y * 2);
// srcPoints[3] = new Point2f(rec.Left * 2, rec.Bottom * 2);
// Point2f[] dstPoints = new Point2f[4];
// dstPoints[0] = new Point2f(0, 0);
// dstPoints[1] = new Point2f(rec.Width * 2, 0);
// dstPoints[2] = new Point2f(rec.Width * 2, rec.Height * 2);
// dstPoints[3] = new Point2f(0, rec.Height * 2);
// Mat transMat = Cv2.GetPerspectiveTransform(srcPoints, dstPoints); //得到变换矩阵
// Mat outPutImg = Mat.Zeros(new Size(rec.Width * 2, rec.Height * 2), MatType.CV_16UC1);
// Cv2.WarpPerspective(originalImg, outPutImg, transMat, outPutImg.Size()); //进行坐标变换
// Cv2.ImShow("Show Img", outPutImg);
// }
private void ShowImg(string winName, Mat img)
{
Cv2.NamedWindow(winName, WindowMode.Normal);
img.PyrDown();
Cv2.ImShow(winName, img);
//if (img.Width > 3800)
//{
// Rect roi = new Rect(1000, 1000, 800, 800);
// // 复制图像
// //Mat roiImg = new Mat(img, roi);
// Cv2.ImShow(winName, roiImg);
//}
//else
//{Cv2.ImShow(winName, img);
//}
}
//}
}
}