filter.cpp

// This program takes in a series of images taken of the same person/place/thing and filters out any inconsistencies that occur, using this I removed the images of a man walking in front of a piece of art and was left with just a picture of the artwork, see pesky tourist assignment.

#include<iostream>
#include<fstream>
#include<vector>
#include<map>
#include<string>
#include<algorithm>

using namespace std;

int median(vector<int> v){ // finds median of a vector
    sort(v.begin(),v.end()); // sort vector to find median
    int mid = (v.size()/2); // median value in the middle
    return v[mid]; // returns value in median index
}

int main(int argc,char* argv[]){
    map<int, vector<int> > pictures;
    string name; int width, height, range;

    for(int i = 1; i < argc; i++){ // read in all pictures

        ifstream inStream; inStream.open(argv[i]);
        inStream >> name >> width >> height >> range;
        for(int j = 0; j < width*height*3; j++){

            int num;
            inStream >> num; pictures[i-1].push_back(num);
        }
        inStream.close();
    }

    vector<int> med;
    ofstream outputFile;
    outputFile.open("noPerson.ppm");
    outputFile << name << " " << width << " " << height << " " << range << " ";

    for(int i = 0; i < width*height*3; i++){ // goes through all pixel colours

        for(int j = 0; j < argc-1; j++){ // goes through all pictures

            med.push_back(pictures[j].at(i));
        }
        int chosen = median(med);
        med.clear();
        outputFile << chosen;
        outputFile << " " << endl; // adds space after every median is in-putted
    }
}