opencv--Sketch

The specific algorithm principle can refer to:

PS Filter, sketch algorithm

Define head function#ifndef ps_algorithm_h_included#define ps_algorithm_h_included#include <iostream># Include <string> #include "cv.h" #include "highgui.h" #include "cxmat.hpp" #include "cxcore.hpp" using namespace std Using namespace Cv;void show_image (mat&, const string &); #endif//Ps_algorithm_h_included/*this program would ge Nerate "Sketch" effect.*/#include "ps_algorithm.h" #include <time.h>using namespace std;using namespace Cv;int    Main (void) {string Img_name ("4.jpg");    Mat image_in;    Image_in=imread (Img_name);    Show_image (image_in, img_name);    Mat image_out (Image_in.size (), CV_32FC3);    Image_in.convertto (Image_out, CV_32FC3);    Mat I (Image_in.size (), CV_32FC1);    Cv::cvtcolor (Image_out, I, Cv_bgr2gray);    i=i/255.0;    Show_image (I, "Gray");    Mat I_invert;    i_invert=-i+1.0;    Show_image (I_invert, "INV");    Mat I_gau;    Gaussianblur (I_invert, I_gau, Size (25,25), 0, 0);    Show_image (I_gau, "gau1");    float delta=0.01; I_gau=-i_gau+1.0+delta;    Show_image (I_gau, "gau");    Mat I_DST;    CV::d ivide (I, I_gau, I_DST);    I_DST=I_DST;    Show_image (I_DST, "DST");    Mat B (Image_in.size (), CV_32FC1);    Mat g (Image_in.size (), CV_32FC1);    Mat R (Image_in.size (), CV_32FC1);    Mat Rgb[]={b,g,r};    float alpha=0.75;    r=alpha*i_dst+ (1-alpha) *200.0/255.0;    g=alpha*i_dst+ (1-alpha) *205.0/255.0;    b=alpha*i_dst+ (1-alpha) *105.0/255.0;    Cv::merge (RGB, 3, image_out);    Show_image (Image_out, "out");    Imwrite ("Out.jpg", image_out*255);    Waitkey (); cout<< "All are well." <<endl;} Define the show image#include "ps_algorithm.h" #include <iostream> #include <string>using namespace std; Using namespace Cv;void show_image (mat& Image, const string& str) {Namedwindow (Str.c_str (), cv_window_autosize)    ; Imshow (Str.c_str (), Image);}

Original

opencv--Sketch