sat.cpp

// SAT.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <vector>
int main()
{
    static const int W = 5;
    static const int H = 5;
    int counter = 1;
    std::vector<std::vector<int> > Img;
    std::vector<std::vector<int> > SAT;

    Img.resize(W);
    SAT.resize(W);

    for (int i = 0; i < W; i++) {
        Img[i].resize(H);
        SAT[i].resize(H);
    }
    for (int i = 0; i < W; i++) {
        for (int j = 0; j < H; j++) {
            Img[i][j] = counter++;
        }
    }
    for (int i = 0; i < W; i++) {
        for (int j = 0; j < H; j++) {
            std::cout << "[" << Img[i][j] << "]";
        }
        std::cout << "\r\n";
    }

    for (int i = 0; i < W; i++) {
        for (int j = 0; j < H; j++) {
            int val = Img[i][j];
            if (i > 0) {
                val += SAT[i - 1][j];
            }
            if (j > 0) {
                val += SAT[i][j - 1];
            }
            if (i > 0 && j > 0)
                val -= SAT[i - 1][j - 1];
            SAT[i][j] = val;
        }
    }



#if 1
    std::cout << "SUM:\r\n";
    for (int i = 0; i < W; i++) {
        for (int j = 0; j < H; j++) {
            std::cout << "[" << SAT[i][j] << "]";
        }
        std::cout << "\r\n" ;
    }
#endif
    /* get correct values from summed-area table,
     * (take care about out of bounce errors) */
    int x1, y1, x2, y2;
    x1 = 0;
    y1 = 0;
    x2 = 2;
    y2 = 2;

    int A = SAT[x1+1][y1+1];
    int D = SAT[x2][y2];
    int B = SAT[x2][y2 - 1];
    int C = SAT[x2 - 1][y2];


    std::cout << A << "," << B << "," << C << "," << D << "\r\n";
    std::cout << "SAT IS: " << D - C - B + A << "\r\n";

}

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