86 lines
2.0 KiB
C++
86 lines
2.0 KiB
C++
/**
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* @file BackProject_Demo1.cpp
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* @brief Sample code for backproject function usage
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* @author OpenCV team
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*/
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#include "opencv2/imgproc/imgproc.hpp"
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#include "opencv2/highgui/highgui.hpp"
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#include <iostream>
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using namespace cv;
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using namespace std;
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/// Global Variables
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Mat src; Mat hsv; Mat hue;
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int bins = 25;
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/// Function Headers
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void Hist_and_Backproj(int, void* );
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/**
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* @function main
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*/
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int main( int argc, char** argv )
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{
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/// Read the image
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src = imread( argv[1], 1 );
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/// Transform it to HSV
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cvtColor( src, hsv, CV_BGR2HSV );
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/// Use only the Hue value
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hue.create( hsv.size(), hsv.depth() );
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int ch[] = { 0, 0 };
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mixChannels( &hsv, 1, &hue, 1, ch, 1 );
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/// Create Trackbar to enter the number of bins
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char* window_image = "Source image";
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namedWindow( window_image, CV_WINDOW_AUTOSIZE );
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createTrackbar("* Hue bins: ", window_image, &bins, 180, Hist_and_Backproj );
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Hist_and_Backproj(0, 0);
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/// Show the image
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imshow( window_image, src );
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/// Wait until user exits the program
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waitKey(0);
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return 0;
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}
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/**
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* @function Hist_and_Backproj
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* @brief Callback to Trackbar
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*/
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void Hist_and_Backproj(int, void* )
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{
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MatND hist;
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int histSize = MAX( bins, 2 );
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float hue_range[] = { 0, 180 };
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const float* ranges = { hue_range };
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/// Get the Histogram and normalize it
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calcHist( &hue, 1, 0, Mat(), hist, 1, &histSize, &ranges, true, false );
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normalize( hist, hist, 0, 255, NORM_MINMAX, -1, Mat() );
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/// Get Backprojection
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MatND backproj;
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calcBackProject( &hue, 1, 0, hist, backproj, &ranges, 1, true );
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/// Draw the backproj
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imshow( "BackProj", backproj );
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/// Draw the histogram
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int w = 400; int h = 400;
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int bin_w = cvRound( (double) w / histSize );
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Mat histImg = Mat::zeros( w, h, CV_8UC3 );
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for( int i = 0; i < bins; i ++ )
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{ 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 ); }
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imshow( "Histogram", histImg );
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}
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