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1. someMatrix.data -> someMatrix.prt() 2. someMatrix.data + someMatrix.step * lineIndex -> someMatrix.ptr( lineIndex ) 3. (SomeType*) someMatrix.data -> someMatrix.ptr<SomeType>() 4. someMatrix.data -> !someMatrix.empty() ( or !someMatrix.data -> someMatrix.empty() ) in logical expressions
71 lines
1.4 KiB
C++
71 lines
1.4 KiB
C++
/**
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* @file LinearBlend.cpp
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* @brief Simple linear blender ( dst = alpha*src1 + beta*src2 )
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* @author OpenCV team
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*/
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#include "opencv2/imgcodecs.hpp"
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#include "opencv2/highgui/highgui.hpp"
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#include <stdio.h>
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using namespace cv;
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/** Global Variables */
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const int alpha_slider_max = 100;
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int alpha_slider;
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double alpha;
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double beta;
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/** Matrices to store images */
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Mat src1;
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Mat src2;
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Mat dst;
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/**
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* @function on_trackbar
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* @brief Callback for trackbar
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*/
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static void on_trackbar( int, void* )
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{
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alpha = (double) alpha_slider/alpha_slider_max ;
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beta = ( 1.0 - alpha );
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addWeighted( src1, alpha, src2, beta, 0.0, dst);
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imshow( "Linear Blend", dst );
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}
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/**
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* @function main
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* @brief Main function
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*/
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int main( void )
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{
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/// Read image ( same size, same type )
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src1 = imread("../images/LinuxLogo.jpg");
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src2 = imread("../images/WindowsLogo.jpg");
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if( src1.empty() ) { printf("Error loading src1 \n"); return -1; }
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if( src2.empty() ) { printf("Error loading src2 \n"); return -1; }
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/// Initialize values
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alpha_slider = 0;
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/// Create Windows
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namedWindow("Linear Blend", 1);
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/// Create Trackbars
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char TrackbarName[50];
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sprintf( TrackbarName, "Alpha x %d", alpha_slider_max );
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createTrackbar( TrackbarName, "Linear Blend", &alpha_slider, alpha_slider_max, on_trackbar );
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/// Show some stuff
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on_trackbar( alpha_slider, 0 );
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/// Wait until user press some key
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waitKey(0);
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return 0;
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}
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