104 lines
2.3 KiB
C++
104 lines
2.3 KiB
C++
/**
|
|
* @file BackProject_Demo2.cpp
|
|
* @brief Sample code for backproject function usage ( a bit more elaborated )
|
|
* @author OpenCV team
|
|
*/
|
|
|
|
#include "opencv2/imgproc/imgproc.hpp"
|
|
#include "opencv2/highgui/highgui.hpp"
|
|
|
|
#include <iostream>
|
|
|
|
using namespace cv;
|
|
using namespace std;
|
|
|
|
/// Global Variables
|
|
Mat src; Mat hsv;
|
|
Mat mask;
|
|
|
|
int lo = 20; int up = 20;
|
|
char* window_image = "Source image";
|
|
|
|
/// Function Headers
|
|
void Hist_and_Backproj( );
|
|
void pickPoint (int event, int x, int y, int, void* );
|
|
|
|
/**
|
|
* @function main
|
|
*/
|
|
int main( int argc, char** argv )
|
|
{
|
|
/// Read the image
|
|
src = imread( argv[1], 1 );
|
|
/// Transform it to HSV
|
|
cvtColor( src, hsv, CV_BGR2HSV );
|
|
|
|
/// Show the image
|
|
namedWindow( window_image, CV_WINDOW_AUTOSIZE );
|
|
imshow( window_image, src );
|
|
|
|
/// Set Trackbars for floodfill thresholds
|
|
createTrackbar( "Low thresh", window_image, &lo, 255, 0 );
|
|
createTrackbar( "High thresh", window_image, &up, 255, 0 );
|
|
/// Set a Mouse Callback
|
|
setMouseCallback( window_image, pickPoint, 0 );
|
|
|
|
waitKey(0);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* @function pickPoint
|
|
*/
|
|
void pickPoint (int event, int x, int y, int, void* )
|
|
{
|
|
if( event != CV_EVENT_LBUTTONDOWN )
|
|
{ return; }
|
|
|
|
// Fill and get the mask
|
|
Point seed = Point( x, y );
|
|
|
|
int newMaskVal = 255;
|
|
Scalar newVal = Scalar( 120, 120, 120 );
|
|
|
|
int connectivity = 8;
|
|
int flags = connectivity + (newMaskVal << 8 ) + FLOODFILL_FIXED_RANGE + FLOODFILL_MASK_ONLY;
|
|
|
|
Mat mask2 = Mat::zeros( src.rows + 2, src.cols + 2, CV_8UC1 );
|
|
floodFill( src, mask2, seed, newVal, 0, Scalar( lo, lo, lo ), Scalar( up, up, up), flags );
|
|
mask = mask2( Range( 1, mask2.rows - 1 ), Range( 1, mask2.cols - 1 ) );
|
|
|
|
imshow( "Mask", mask );
|
|
|
|
Hist_and_Backproj( );
|
|
}
|
|
|
|
/**
|
|
* @function Hist_and_Backproj
|
|
*/
|
|
void Hist_and_Backproj( )
|
|
{
|
|
MatND hist;
|
|
int h_bins = 30; int s_bins = 32;
|
|
int histSize[] = { h_bins, s_bins };
|
|
|
|
float h_range[] = { 0, 179 };
|
|
float s_range[] = { 0, 255 };
|
|
const float* ranges[] = { h_range, s_range };
|
|
|
|
int channels[] = { 0, 1 };
|
|
|
|
/// Get the Histogram and normalize it
|
|
calcHist( &hsv, 1, channels, mask, hist, 2, histSize, ranges, true, false );
|
|
|
|
normalize( hist, hist, 0, 255, NORM_MINMAX, -1, Mat() );
|
|
|
|
/// Get Backprojection
|
|
MatND backproj;
|
|
calcBackProject( &hsv, 1, channels, hist, backproj, ranges, 1, true );
|
|
|
|
/// Draw the backproj
|
|
imshow( "BackProj", backproj );
|
|
|
|
}
|