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/**
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* @file compareHist_Demo.cpp |
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* @brief Sample code to use the function compareHist |
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* @author OpenCV team |
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*/ |
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#include "opencv2/highgui/highgui.hpp" |
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#include "opencv2/imgproc/imgproc.hpp" |
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#include <iostream> |
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#include <stdio.h> |
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using namespace std; |
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using namespace cv; |
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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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Mat src_base, hsv_base; |
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Mat src_test1, hsv_test1; |
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Mat src_test2, hsv_test2; |
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Mat hsv_half_down; |
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/// Load three images with different environment settings
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if( argc < 4 ) |
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{ printf("** Error. Usage: ./compareHist_Demo <image_settings0> <image_setting1> <image_settings2>\n"); |
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return -1;
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} |
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src_base = imread( argv[1], 1 ); |
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src_test1 = imread( argv[2], 1 ); |
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src_test2 = imread( argv[3], 1 ); |
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/// Convert to HSV
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cvtColor( src_base, hsv_base, CV_BGR2HSV ); |
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cvtColor( src_test1, hsv_test1, CV_BGR2HSV ); |
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cvtColor( src_test2, hsv_test2, CV_BGR2HSV ); |
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hsv_half_down = hsv_base( Range( hsv_base.rows/2, hsv_base.rows - 1 ), Range( 0, hsv_base.cols - 1 ) );
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/// Using 30 bins for hue and 32 for saturation
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int h_bins = 50; int s_bins = 60; |
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int histSize[] = { h_bins, s_bins }; |
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// hue varies from 0 to 256, saturation from 0 to 180
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float h_ranges[] = { 0, 256 }; |
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float s_ranges[] = { 0, 180 }; |
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const float* ranges[] = { h_ranges, s_ranges }; |
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// Use the o-th and 1-st channels
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int channels[] = { 0, 1 }; |
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/// Histograms
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MatND hist_base; |
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MatND hist_half_down; |
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MatND hist_test1; |
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MatND hist_test2; |
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/// Calculate the histograms for the HSV images
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calcHist( &hsv_base, 1, channels, Mat(), hist_base, 2, histSize, ranges, true, false ); |
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normalize( hist_base, hist_base, 0, 1, NORM_MINMAX, -1, Mat() ); |
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calcHist( &hsv_half_down, 1, channels, Mat(), hist_half_down, 2, histSize, ranges, true, false ); |
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normalize( hist_half_down, hist_half_down, 0, 1, NORM_MINMAX, -1, Mat() ); |
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calcHist( &hsv_test1, 1, channels, Mat(), hist_test1, 2, histSize, ranges, true, false ); |
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normalize( hist_test1, hist_test1, 0, 1, NORM_MINMAX, -1, Mat() ); |
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calcHist( &hsv_test2, 1, channels, Mat(), hist_test2, 2, histSize, ranges, true, false ); |
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normalize( hist_test2, hist_test2, 0, 1, NORM_MINMAX, -1, Mat() ); |
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/// Apply the histogram comparison methods
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for( int i = 0; i < 4; i++ ) |
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{ int compare_method = i;
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double base_base = compareHist( hist_base, hist_base, compare_method ); |
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double base_half = compareHist( hist_base, hist_half_down, compare_method ); |
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double base_test1 = compareHist( hist_base, hist_test1, compare_method ); |
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double base_test2 = compareHist( hist_base, hist_test2, compare_method ); |
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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 ); |
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}
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printf( "Done \n" ); |
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return 0; |
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} |
After Width: | Height: | Size: 39 KiB |
After Width: | Height: | Size: 19 KiB |
After Width: | Height: | Size: 15 KiB |
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