在圖像上只發現大斑點

你好，我試圖找到這個圖像上的字符。在圖像上只發現大斑點

這是我經過一些預處理後的圖像，我收到了這張圖片。

現在我試圖做連接組件標籤來查找blob。但是我也得到了很多小斑點。

enter image description here

#include <iostream> 
#include <vector> 
#include <stdio.h> 
#include <stdlib.h> 
#include <opencv2/highgui/highgui.hpp> 
#include <opencv2/imgproc/imgproc.hpp> 

using namespace cv; 
using namespace std; 

void FindBlobs(const Mat &binary, vector < vector<Point2i> > &blobs); 

int main(int argc, char **argv) 
{ 

    Mat img = imread("adaptive.png", 0); 

    if(!img.data) { 
     cout << "File not found" << endl; 
     return -1; 
    } 

    namedWindow("binary"); 
    namedWindow("labelled"); 

    Mat output = Mat::zeros(img.size(), CV_8UC3); 

    Mat binary; 
    vector < vector<Point2i > > blobs; 

    threshold(img, binary, 0, 1, THRESH_BINARY_INV); 


    FindBlobs(binary, blobs); 

    // Randomy color the blobs 
    for(size_t i=0; i < blobs.size(); i++) { 
     unsigned char r = 255 * (rand()/(1.0 + RAND_MAX)); 
     unsigned char g = 255 * (rand()/(1.0 + RAND_MAX)); 
     unsigned char b = 255 * (rand()/(1.0 + RAND_MAX)); 

     for(size_t j=0; j < blobs[i].size(); j++) { 
      int x = blobs[i][j].x; 
      int y = blobs[i][j].y; 
      output.at<Vec3b>(y,x)[0] = b;//Vec3b RGB color order 
      output.at<Vec3b>(y,x)[1] = g; 
      output.at<Vec3b>(y,x)[2] = r; 
     } 
    } 





    imshow("binary", img); 
    imshow("labelled", output); 
    waitKey(0); 

    return 0; 
} 

void FindBlobs(const Mat &binary, vector < vector<Point2i> > &blobs) 
{ 
    blobs.clear(); 



    Mat label_image; 
    binary.convertTo(label_image, CV_32SC1); 

    int label_count = 2; // starts at 2 because 0,1 are used already 

    for(int y=0; y < label_image.rows; y++) { 
     int *row = (int*)label_image.ptr(y); 
     for(int x=0; x < label_image.cols; x++) { 
      if(row[x] != 1) { 
       continue; 
      } 

      Rect rect; 

      floodFill(label_image, Point(x,y), label_count, &rect, 0, 0, 4); 

      vector <Point2i> blob; 

      for(int i=rect.y; i < (rect.y+rect.height); i++) { 
       int *row2 = (int*)label_image.ptr(i); 
       for(int j=rect.x; j < (rect.x+rect.width); j++) { 
        if(row2[j] != label_count) { 
         continue; 
        } 
         blob.push_back(Point2i(j,i)); 

       } 
      } 

      blobs.push_back(blob); 

      label_count++; 
        } 
    } 

}

所以用這個算法我收到的斑點

enter image description here

但是當我做

if(blobs.size()>50) { 
         blob.push_back(Point2i(j,i)); 
        }

我收到黑屏。然而當我嘗試

if(blob.size()<50){ 
         blob.push_back(Point2i(j,i)); 
        }

我收到小blob什麼可能是這裏的實際問題？

enter image description here

來源

2015-01-21 Anar Bayramov

猜你要存儲這些「大」斑點？

如果是這樣，更改下面的代碼

blobs.push_back(blob); 
label_count++;

這樣：

if(blob.size() > 50){ 
    blobs.push_back(blob); 
} 
label_count++;

而且可以接收彩信這樣的：

enter image description here

來源

2015-01-21 11:49:56 pwwpche

在圖像上只發現大斑點

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