我需要在圖像中使用opencvsharp識別文本

其實我試圖識別圖像中的文字位置，然後將其轉換爲文本。

我發現了一些代碼寫在c + +，我試圖將其轉換爲C＃。你能幫我嗎？

std::vector<cv::Rect> detectLetters(cv::Mat img) 
{  std::vector<cv::Rect> boundRect;[enter image description here][1] 
    cv::Mat img_gray, img_sobel, img_threshold, element; 
    cvtColor(img, img_gray, CV_BGR2GRAY); 
    cv::Sobel(img_gray, img_sobel, CV_8U, 1, 0, 3, 1, 0, cv::BORDER_DEFAULT); 
    cv::threshold(img_sobel, img_threshold, 0, 255, CV_THRESH_OTSU+CV_THRESH_BINARY); 
    element = getStructuringElement(cv::MORPH_RECT, cv::Size(10, 15)); 
    cv::morphologyEx(img_threshold, img_threshold, CV_MOP_CLOSE, element); //Does the trick 
    std::vector< std::vector< cv::Point> > contours; 
    cv::findContours(img_threshold, contours, 0, 1); 
    std::vector<std::vector<cv::Point> > contours_poly(contours.size()); 
    for(int i = 0; i < contours.size(); i++) 
     if (contours[i].size()>80) 
     { 
      cv::approxPolyDP(cv::Mat(contours[i]), contours_poly[i], 17, true); 
      cv::Rect appRect(boundingRect(cv::Mat(contours_poly[i]))); 
      if (appRect.width>appRect.height) 
       boundRect.push_back(appRect); 
     } 
     return boundRect; 
}

，我嘗試將其轉換爲C＃，但它沒有工作

private List<Rectangle> detectLetters(IntPtr img) 
{ 
    //cvtColor(img, img_gray, CV_BGR2GRAY); 
    List<Rectangle> boundRect = new List<Rectangle>(); 

    //cv::Mat img_gray, img_sobel, img_threshold, element; 
    IntPtr 
     img_gray = IntPtr.Zero, 
     img_sobel= IntPtr.Zero, 
     img_threshold= IntPtr.Zero, 
     img_tmp = IntPtr.Zero, 
     element= IntPtr.Zero; 

    //cvtColor(img, img_gray, CV_BGR2GRAY); 
    CvInvoke.cvCvtColor(img, img_gray,COLOR_CONVERSION.CV_BGR2GRAY); //CV_BGR2GRAY); 

    //cv::Sobel(img_gray, img_sobel, CV_8U, 1, 0, 3, 1, 0, cv::BORDER_DEFAULT); 
    CvInvoke.cvSobel(img_gray, img_sobel, 0, 1, 1);//, 3, 1, 0, cv.BORDER_DEFAULT); 

    //cv.threshold(img_sobel, img_threshold, 0, 255, CV_THRESH_OTSU + CV_THRESH_BINARY); 
    CvInvoke.cvThreshold(img_sobel, img_threshold, 0, 255, THRESH.CV_THRESH_BINARY|THRESH.CV_THRESH_OTSU); 

    //element = getStructuringElement(cv.MORPH_RECT, cv.Size(10, 15)); 
    element = CvInvoke.cvCreateStructuringElementEx(1,1,10,15,CV_ELEMENT_SHAPE.CV_SHAPE_RECT,element);// GetStructuringElement(

    //cv.morphologyEx(img_threshold, img_threshold, CV_MOP_CLOSE, element); //Does the trick 
    CvInvoke.cvMorphologyEx(img_threshold,img_threshold,img_tmp,element,CV_MORPH_OP.CV_MOP_CLOSE,1); 

    //List<List<cv.Point>> contours = new List<List<cv.Point>>(); 
    var contours = new List<IntPtr>(); 

    //cv.findContours(img_threshold, contours, 0, 1); 
    CvInvoke.cvFindContours(img_threshold, element,ref ((IntPtr)contours[0]), 1, RETR_TYPE.CV_RETR_EXTERNAL, CHAIN_APPROX_METHOD.CV_CHAIN_APPROX_NONE,new Point(0,0)); 


    //std::vector<std::vector<cv::Point> > contours_poly(contours.size()); 
    var contours_poly = new List<List<Point>>(contours.Count); 

    //for(int i = 0; i < contours.size(); i++) 
    for (int i = 0; i < contours.Count; i++) 
    { 
     //if (contours[i].size()>80) 
     if (contours[i].ToInt32() > 80) 
     { 
      //cv.approxPolyDP(Emgu.CV.Matrix<>(contours[i]), contours_poly[i], 17, true); 
      CvInvoke.cvApproxPoly(contours[i], 17,contours_poly[i],APPROX_POLY_TYPE.CV_POLY_APPROX_DP, 1,1); 
      //cv::Rect appRect(boundingRect(cv::Mat(contours_poly[i]))); 
      Rectangle appRect = new Rectangle(CvInvoke.cvBoundingRect(contours_poly[i],false)); 
      //if (appRect.width>appRect.height) 
      if (appRect.width > appRect.height) 
      { 
       //boundRect.push_back(appRect); 
       boundRect.Add(appRect); 
      } 
     } 
    } 
    //return boundRect; 
    return boundRect; 
}

來源

2015-12-19 Haïtham Kahloul

根據您要查找的文本的大小，您可能必須使用元素大小和ApproxPolyDP的變量，但是這個代碼非常接近原始數據，但使用OpenCvSharp術語。

static List<Rect> RunTextRecog(string inFile) 
{ 
    List<Rect> boundRect = new List<Rect>(); 
    using (Mat img = new Mat(inFile)) 
    using (Mat img_gray = new Mat()) 
    using (Mat img_sobel = new Mat()) 
    using (Mat img_threshold = new Mat()) 
    { 
     Cv2.CvtColor(img, img_gray, ColorConversionCodes.BGR2GRAY); 
     Cv2.Sobel(img_gray, img_sobel, MatType.CV_8U, 1, 0, 3, 1, 0, BorderTypes.Default); 
     Cv2.Threshold(img_sobel, img_threshold, 0, 255, ThresholdTypes.Otsu | ThresholdTypes.Binary); 
     using (Mat element = Cv2.GetStructuringElement(MorphShapes.Rect, new Size(10, 15))) 
     { 
      Cv2.MorphologyEx(img_threshold, img_threshold, MorphTypes.Close, element); 
      Point[][] edgesArray = img_threshold.Clone().FindContoursAsArray(RetrievalModes.External, ContourApproximationModes.ApproxNone); 
      foreach (Point[] edges in edgesArray) 
      { 
       Point[] normalizedEdges = Cv2.ApproxPolyDP(edges, 17, true); 
       Rect appRect = Cv2.BoundingRect(normalizedEdges); 
       boundRect.Add(appRect); 
      } 
     } 
    } 
    return boundRect; 
}

來源

2016-01-04 22:10:46 Darren

我需要在圖像中使用opencvsharp識別文本

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