Question

使用opencv从图像中提取不同大小的矩形无法正常工作它没有给我们所有角色的补丁，只给一个补丁，但我想要所有角色的补丁

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

using namespace cv;
using namespace std;

Mat src; Mat src_gray;
int thresh = 100;
int max_thresh = 255;
RNG rng(12345);

/// Function header
void thresh_callback(int, void* );

/** @function main */
int main( int argc, char** argv )
{
  /// Load source image and convert it to gray
  src = imread( "1a.bmp" );

  /// Convert image to gray and blur it
  cvtColor( src, src_gray, CV_BGR2GRAY );
  blur( src_gray, src_gray, Size(3,3) );

  /// Create Window
  char* source_window = "Source";
  namedWindow( source_window, CV_WINDOW_AUTOSIZE );
  imshow( source_window, src );

  createTrackbar( " Threshold:", "Source", &thresh, max_thresh, thresh_callback );
  thresh_callback( 0, 0 );

  waitKey(0);
  return(0);
}

/** @function thresh_callback */
void thresh_callback(int, void* )
{
  Mat threshold_output;
  vector<vector<Point> > contours;
  vector<Vec4i> hierarchy;

  /// Detect edges using Threshold
  threshold( src_gray, threshold_output, thresh, 255, THRESH_BINARY );
  /// Find contours
  findContours( threshold_output, contours, hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );

  /// Approximate contours to polygons + get bounding rects and circles
  vector<vector<Point> > contours_poly( contours.size() );
  vector<Rect> boundRect( contours.size() );
  vector<Point2f>center( contours.size() );
  vector<float>radius( contours.size() );

  for( int i = 0; i < contours.size(); i++ )
     { approxPolyDP( Mat(contours[i]), contours_poly[i], 3, true );
       boundRect[i] = boundingRect( Mat(contours_poly[i]) );
       minEnclosingCircle( (Mat)contours_poly[i], center[i], radius[i] );
     }


  /// Draw polygonal contour + bonding rects + circles
  Mat drawing = Mat::zeros( threshold_output.size(), CV_8UC3 );
  for( int i = 0; i< contours.size(); i++ )
     {
       Scalar color = Scalar( rng.uniform(0, 255), rng.uniform(0,255), rng.uniform(0,255) );
       drawContours( drawing, contours_poly, i, color, 1, 8, vector<Vec4i>(), 0, Point() );
       rectangle( drawing, boundRect[i].tl(), boundRect[i].br(), color, 2, 8, 0 );
      //circle( drawing, center[i], (int)radius[i], color, 2, 8, 0 );
     }

  /// Show in a window
  namedWindow( "Contours", CV_WINDOW_AUTOSIZE );
  imshow( "Contours", drawing );
  for(int i = 0; i < boundRect.size(); i++)
{
     Mat patch = src(boundRect[i]);
     //Do whatever you want with the patch (imshow, imwrite,...)
     imshow("Patch",patch);
}
}

Answer 1

我认为您不必提取矩形，因为您已经在vector<Rect> boundRect中使用了矩形。
如果你想获得包含矩形/字符的图像补丁，你只需要将它们剪掉：

stringstream ss;
for(int i = 0; i < boundRect.size(); i++)
{
     ss>>"Patch ">>i;
     Mat patch = src(boundRect[i]);
     //Do whatever you want with the patch (imshow, imwrite,...)
     imshow(ss.str(), patch);
     ss.str("");
}

Answer 2

@user，你也可以在opencv文档中试试这个

CvMemStorage* storage = cvCreateMemStorage(0);
CvSeq* contours = 0;
cvFindContours( img, storage, &contours, sizeof(CvContour),
CV_RETR_LIST , CV_CHAIN_APPROX_NONE, cvPoint(0,0) );
for( CvSeq* c=contours; c!=NULL; c=c->h_next)
{
CvRect Rects = cvBoundingRect( c );
}

@dennis我还需要提取线。指导我也

使用opencv从图像中提取不同大小的矩形

2 个答案: