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 */
main(int argc,char ** argv)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