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/**
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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/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.data ) { printf("Error loading src1 \n"); return -1; }
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if( !src2.data ) { 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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@@ -1,69 +0,0 @@
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/**
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* @file LinearTransforms.cpp
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* @brief Simple program to change contrast and brightness
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* @date Mon, June 6, 2011
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* @author OpenCV team
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*/
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#include "opencv2/highgui/highgui.hpp"
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using namespace cv;
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/** Global Variables */
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const int alpha_max = 5;
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const int beta_max = 125;
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int alpha; /**< Simple contrast control */
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int beta; /**< Simple brightness control*/
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/** Matrices to store images */
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Mat image;
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/**
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* @function on_trackbar
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* @brief Called whenever any of alpha or beta changes
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*/
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static void on_trackbar( int, void* )
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{
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Mat new_image = Mat::zeros( image.size(), image.type() );
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for( int y = 0; y < image.rows; y++ )
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{ for( int x = 0; x < image.cols; x++ )
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{ for( int c = 0; c < 3; c++ )
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{
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new_image.at<Vec3b>(y,x)[c] = saturate_cast<uchar>( alpha*( image.at<Vec3b>(y,x)[c] ) + beta );
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}
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}
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}
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imshow("New Image", new_image);
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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( int, char** argv )
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{
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/// Read image given by user
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image = imread( argv[1] );
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/// Initialize values
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alpha = 1;
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beta = 0;
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/// Create Windows
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namedWindow("Original Image", 1);
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namedWindow("New Image", 1);
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/// Create Trackbars
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createTrackbar( "Contrast Trackbar", "New Image", &alpha, alpha_max, on_trackbar );
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createTrackbar( "Brightness Trackbar", "New Image", &beta, beta_max, on_trackbar );
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/// Show some stuff
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imshow("Original Image", image);
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imshow("New Image", image);
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/// Wait until user press some key
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waitKey();
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return 0;
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}
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