2b106db02f
Also fixed some typos and code alignment Also adapted tutorial CPP samples Fixed some identation problems
86 lines
2.0 KiB
C++
86 lines
2.0 KiB
C++
/**
|
|
* @file BackProject_Demo1.cpp
|
|
* @brief Sample code for backproject function usage
|
|
* @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 hue;
|
|
int bins = 25;
|
|
|
|
/// Function Headers
|
|
void Hist_and_Backproj(int, void* );
|
|
|
|
|
|
/**
|
|
* @function main
|
|
*/
|
|
int main( int, char** argv )
|
|
{
|
|
/// Read the image
|
|
src = imread( argv[1], 1 );
|
|
/// Transform it to HSV
|
|
cvtColor( src, hsv, COLOR_BGR2HSV );
|
|
|
|
/// Use only the Hue value
|
|
hue.create( hsv.size(), hsv.depth() );
|
|
int ch[] = { 0, 0 };
|
|
mixChannels( &hsv, 1, &hue, 1, ch, 1 );
|
|
|
|
/// Create Trackbar to enter the number of bins
|
|
const char* window_image = "Source image";
|
|
namedWindow( window_image, WINDOW_AUTOSIZE );
|
|
createTrackbar("* Hue bins: ", window_image, &bins, 180, Hist_and_Backproj );
|
|
Hist_and_Backproj(0, 0);
|
|
|
|
/// Show the image
|
|
imshow( window_image, src );
|
|
|
|
/// Wait until user exits the program
|
|
waitKey(0);
|
|
return 0;
|
|
}
|
|
|
|
|
|
/**
|
|
* @function Hist_and_Backproj
|
|
* @brief Callback to Trackbar
|
|
*/
|
|
void Hist_and_Backproj(int, void* )
|
|
{
|
|
MatND hist;
|
|
int histSize = MAX( bins, 2 );
|
|
float hue_range[] = { 0, 180 };
|
|
const float* ranges = { hue_range };
|
|
|
|
/// Get the Histogram and normalize it
|
|
calcHist( &hue, 1, 0, Mat(), hist, 1, &histSize, &ranges, true, false );
|
|
normalize( hist, hist, 0, 255, NORM_MINMAX, -1, Mat() );
|
|
|
|
/// Get Backprojection
|
|
MatND backproj;
|
|
calcBackProject( &hue, 1, 0, hist, backproj, &ranges, 1, true );
|
|
|
|
/// Draw the backproj
|
|
imshow( "BackProj", backproj );
|
|
|
|
/// Draw the histogram
|
|
int w = 400; int h = 400;
|
|
int bin_w = cvRound( (double) w / histSize );
|
|
Mat histImg = Mat::zeros( w, h, CV_8UC3 );
|
|
|
|
for( int i = 0; i < bins; i ++ )
|
|
{ rectangle( histImg, Point( i*bin_w, h ), Point( (i+1)*bin_w, h - cvRound( hist.at<float>(i)*h/255.0 ) ), Scalar( 0, 0, 255 ), -1 ); }
|
|
|
|
imshow( "Histogram", histImg );
|
|
|
|
}
|