almost median filter.

ofApp.cpp

#include "ofApp.h"

//--------------------------------------------------------------
void ofApp::setup(){
    
    img.load("img.jpg");
    pix = img.getPixels();
    pix2 = img.getPixels();
    
    ind =0;
    
    doExport=true;
}

//--------------------------------------------------------------
void ofApp::update(){
   


    
    pix = img.getPixels();
    for(int i=1; i<img.getWidth()-1; i++){
        
        for(int j=1; j<img.getHeight()-1;j++){
            
            
            float x=i;
            float y=j;
            
            std::list<ofColor> colors;
            colors.sort([](const ofColor &f, const ofColor &s) { return f.b < s.b; });

            
            ofColor c0 = pix.getColor(x-1,y-1);
            colors.push_back(c0);
            ofColor c1 = pix.getColor(x,y-1);
            colors.push_back(c1);
            ofColor  c2 = pix.getColor(x+1,y-1);
            colors.push_back(c2);
            ofColor  c3 = pix.getColor(x-1,y);
            colors.push_back(c3);
            ofColor c4 = pix.getColor(x,y);
            colors.push_back(c4);
            ofColor  c5 = pix.getColor(x+1,y);
            colors.push_back(c5);
            
            ofColor  c6 = pix.getColor(x-1,y+1);
            colors.push_back(c6);
            ofColor  c7 = pix.getColor(x,y+1);
            colors.push_back(c7);
            ofColor  c8 = pix.getColor(x+1,y+1);
            colors.push_back(c8);
            
            
            colors.sort([](const ofColor &f, const ofColor &s) { return f.getHue() < s.getHue(); });

            
        
            pix2.setColor(x,y,  getColor(colors, 3));
            
            
            }
        
    }
    
    if(doExport && ofGetFrameNum()<500){
        
        ostringstream st;
        st << "frame_" << setw(5) << setfill('0') << ofGetFrameNum() << ".png";
        string fn = "./exp4/"+st.str();
        
        
        
        ofSaveImage(pix2, fn);
        
        cout<<"saved frame: "<<ofGetFrameNum()<<endl;
        
        
    }



}

//--------------------------------------------------------------
void ofApp::draw(){
    
    img.setFromPixels(pix2);
    img.draw(0,0);
    

}

//--------------------------------------------------------------
void ofApp::keyPressed(int key){

}

//--------------------------------------------------------------
void ofApp::keyReleased(int key){

}

//--------------------------------------------------------------
void ofApp::mouseMoved(int x, int y ){

}

//--------------------------------------------------------------
void ofApp::mouseDragged(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mousePressed(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mouseReleased(int x, int y, int button){

}

//--------------------------------------------------------------
void ofApp::mouseEntered(int x, int y){

}

//--------------------------------------------------------------
void ofApp::mouseExited(int x, int y){

}

//--------------------------------------------------------------
void ofApp::windowResized(int w, int h){

}

//--------------------------------------------------------------
void ofApp::gotMessage(ofMessage msg){

}

//--------------------------------------------------------------
void ofApp::dragEvent(ofDragInfo dragInfo){ 

}


ofColor ofApp::getColor(list<ofColor> _list, int _i){
    list<ofColor>::iterator it = _list.begin();
    for(int i=0; i<_i; i++){
        ++it;
    }
    return *it;
}