1 /** 2 * @file compareHist_Demo.cpp 3 * @brief Sample code to use the function compareHist 4 * @author OpenCV team 5 */ 6 7 #include "opencv2/imgcodecs.hpp" 8 #include "opencv2/highgui/highgui.hpp" 9 #include "opencv2/imgproc/imgproc.hpp" 10 #include <iostream> 11 #include <stdio.h> 12 13 using namespace std; 14 using namespace cv; 15 16 /** 17 * @function main 18 */ 19 int main( int argc, char** argv ) 20 { 21 Mat src_base, hsv_base; 22 Mat src_test1, hsv_test1; 23 Mat src_test2, hsv_test2; 24 Mat hsv_half_down; 25 26 /// Load three images with different environment settings 27 if( argc < 4 ) 28 { 29 printf("** Error. Usage: ./compareHist_Demo <image_settings0> <image_setting1> <image_settings2>\n"); 30 return -1; 31 } 32 33 src_base = imread( argv[1], 1 ); 34 src_test1 = imread( argv[2], 1 ); 35 src_test2 = imread( argv[3], 1 ); 36 37 /// Convert to HSV 38 cvtColor( src_base, hsv_base, COLOR_BGR2HSV ); 39 cvtColor( src_test1, hsv_test1, COLOR_BGR2HSV ); 40 cvtColor( src_test2, hsv_test2, COLOR_BGR2HSV ); 41 42 hsv_half_down = hsv_base( Range( hsv_base.rows/2, hsv_base.rows - 1 ), Range( 0, hsv_base.cols - 1 ) ); 43 44 /// Using 50 bins for hue and 60 for saturation 45 int h_bins = 50; int s_bins = 60; 46 int histSize[] = { h_bins, s_bins }; 47 48 // hue varies from 0 to 179, saturation from 0 to 255 49 float h_ranges[] = { 0, 180 }; 50 float s_ranges[] = { 0, 256 }; 51 52 const float* ranges[] = { h_ranges, s_ranges }; 53 54 // Use the o-th and 1-st channels 55 int channels[] = { 0, 1 }; 56 57 58 /// Histograms 59 MatND hist_base; 60 MatND hist_half_down; 61 MatND hist_test1; 62 MatND hist_test2; 63 64 /// Calculate the histograms for the HSV images 65 calcHist( &hsv_base, 1, channels, Mat(), hist_base, 2, histSize, ranges, true, false ); 66 normalize( hist_base, hist_base, 0, 1, NORM_MINMAX, -1, Mat() ); 67 68 calcHist( &hsv_half_down, 1, channels, Mat(), hist_half_down, 2, histSize, ranges, true, false ); 69 normalize( hist_half_down, hist_half_down, 0, 1, NORM_MINMAX, -1, Mat() ); 70 71 calcHist( &hsv_test1, 1, channels, Mat(), hist_test1, 2, histSize, ranges, true, false ); 72 normalize( hist_test1, hist_test1, 0, 1, NORM_MINMAX, -1, Mat() ); 73 74 calcHist( &hsv_test2, 1, channels, Mat(), hist_test2, 2, histSize, ranges, true, false ); 75 normalize( hist_test2, hist_test2, 0, 1, NORM_MINMAX, -1, Mat() ); 76 77 /// Apply the histogram comparison methods 78 for( int i = 0; i < 4; i++ ) 79 { 80 int compare_method = i; 81 double base_base = compareHist( hist_base, hist_base, compare_method ); 82 double base_half = compareHist( hist_base, hist_half_down, compare_method ); 83 double base_test1 = compareHist( hist_base, hist_test1, compare_method ); 84 double base_test2 = compareHist( hist_base, hist_test2, compare_method ); 85 86 printf( " Method [%d] Perfect, Base-Half, Base-Test(1), Base-Test(2) : %f, %f, %f, %f \n", i, base_base, base_half , base_test1, base_test2 ); 87 } 88 89 printf( "Done \n" ); 90 91 return 0; 92 } 93
