Question

我正在构建一个程序来计算两个图像的psnr（峰值信噪比）。编译以下代码时出现以下错误：

Psnr.java:35: cannot find symbol
symbol  : variable ArrayIO
location: class Psnr
ArrayIO.readByteArray(args[2], img1, nrows, ncols);

Psnr.java

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 <nrows> <ncols> <img1> <img2>");
  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<nrows; i++) {
  for (int j=0; j<ncols; j++) {
    signal += img1[i][j] * img1[i][j];
    noise += (img1[i][j] - img2[i][j]) * (img1[i][j] - img2[i][j]);
    if (peak < img1[i][j])
      peak = img1[i][j];
  }
}

mse = noise/(nrows*ncols); // Mean square error
System.out.println("MSE: " + mse);
System.out.println("SNR: " + 10*log10(signal/noise));
System.out.println("PSNR(max=255): " + (10*log10(255*255/mse)));
System.out.println("PSNR(max=" + peak + "): " + 10*log10((peak*peak)/mse));
  }
}

我需要做些什么来纠正程序？

Answer 1

ArrayIO不是java.io包中的类。您需要导入正确的包（import语句）并将库添加到类路径中（ArrayIO不是Java API的一部分）

找不到符号变量ArrayIO

1 个答案: