*/
import java.io.*;

public class Psnr {

  public static double log10(double x) {
    return Math.log(x)/Math.log(10);
  }

  public static void main (String[] args) {
    int     nrows, ncols;
    int     img1[][], img2[][];
    double  peak, signal, noise, mse;

    if (args.length != 4) {
      System.out.println("Usage: Psnr    ");
      return;
    }
    nrows = Integer.parseInt(args[0]);
    ncols = Integer.parseInt(args[1]);
    img1 = new int[nrows][ncols];
    img2 = new int[nrows][ncols];
    ArrayIO.readByteArray(args[2], img1, nrows, ncols);
    ArrayIO.readByteArray(args[3], img2, nrows, ncols);

    signal = noise = peak = 0;
    for (int i=0; i