* **Code at glance:**
-.. code-block:: cpp
-
- #include "opencv2/highgui/highgui.hpp"
- #include "opencv2/imgproc/imgproc.hpp"
- #include <iostream>
- #include <stdio.h>
-
- using namespace std;
- using namespace cv;
-
- /** @function main */
- int main( int argc, char** argv )
- {
- Mat src_base, hsv_base;
- Mat src_test1, hsv_test1;
- Mat src_test2, hsv_test2;
- Mat hsv_half_down;
-
- /// Load three images with different environment settings
- if( argc < 4 )
- { printf("** Error. Usage: ./compareHist_Demo <image_settings0> <image_setting1> <image_settings2>\n");
- return -1;
- }
-
- src_base = imread( argv[1], 1 );
- src_test1 = imread( argv[2], 1 );
- src_test2 = imread( argv[3], 1 );
-
- /// Convert to HSV
- cvtColor( src_base, hsv_base, CV_BGR2HSV );
- cvtColor( src_test1, hsv_test1, CV_BGR2HSV );
- cvtColor( src_test2, hsv_test2, CV_BGR2HSV );
-
- hsv_half_down = hsv_base( Range( hsv_base.rows/2, hsv_base.rows - 1 ), Range( 0, hsv_base.cols - 1 ) );
-
- /// Using 30 bins for hue and 32 for saturation
- int h_bins = 50; int s_bins = 60;
- int histSize[] = { h_bins, s_bins };
-
- // hue varies from 0 to 256, saturation from 0 to 180
- float h_ranges[] = { 0, 256 };
- float s_ranges[] = { 0, 180 };
-
- const float* ranges[] = { h_ranges, s_ranges };
-
- // Use the o-th and 1-st channels
- int channels[] = { 0, 1 };
-
- /// Histograms
- MatND hist_base;
- MatND hist_half_down;
- MatND hist_test1;
- MatND hist_test2;
-
- /// Calculate the histograms for the HSV images
- calcHist( &hsv_base, 1, channels, Mat(), hist_base, 2, histSize, ranges, true, false );
- normalize( hist_base, hist_base, 0, 1, NORM_MINMAX, -1, Mat() );
+.. literalinclude:: ../../../../../samples/cpp/tutorial_code/Histograms_Matching/compareHist_Demo.cpp
+ :language: cpp
+ :tab-width: 4
- calcHist( &hsv_half_down, 1, channels, Mat(), hist_half_down, 2, histSize, ranges, true, false );
- normalize( hist_half_down, hist_half_down, 0, 1, NORM_MINMAX, -1, Mat() );
-
- calcHist( &hsv_test1, 1, channels, Mat(), hist_test1, 2, histSize, ranges, true, false );
- normalize( hist_test1, hist_test1, 0, 1, NORM_MINMAX, -1, Mat() );
-
- calcHist( &hsv_test2, 1, channels, Mat(), hist_test2, 2, histSize, ranges, true, false );
- normalize( hist_test2, hist_test2, 0, 1, NORM_MINMAX, -1, Mat() );
-
- /// Apply the histogram comparison methods
- for( int i = 0; i < 4; i++ )
- { int compare_method = i;
- double base_base = compareHist( hist_base, hist_base, compare_method );
- double base_half = compareHist( hist_base, hist_half_down, compare_method );
- double base_test1 = compareHist( hist_base, hist_test1, compare_method );
- double base_test2 = compareHist( hist_base, hist_test2, compare_method );
-
- 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 );
- }
-
- printf( "Done \n" );
-
- return 0;
- }
Explanation
.. code-block:: cpp
- int h_bins = 50; int s_bins = 32;
+ int h_bins = 50; int s_bins = 60;
int histSize[] = { h_bins, s_bins };
- float h_ranges[] = { 0, 256 };
- float s_ranges[] = { 0, 180 };
+ float h_ranges[] = { 0, 180 };
+ float s_ranges[] = { 0, 256 };
const float* ranges[] = { h_ranges, s_ranges };