如何从位图读取图像数据并将其存储在2D阵列中?

时间:2014-10-08 02:38:32

标签: java bitmap

我正在尝试将像素数据加载到2D数组中。我已经加载了头文件,因此iData数组将图像数据保存为一维数组,但我希望它在二维数组中。 adjWidth是包含00字节填充的宽度。

// get image byteData
byte[] iData = new byte[this.size - 54];
try {
    fin.read(iData);
} catch (IOException ex) {
    System.err.printf("ERROR: File %s is unreadable!\n", filename);
    Logger.getLogger(Bitmap.class.getName()).log(Level.SEVERE, null, ex);
}

// send pixels to the buffer array
// pixels are organized from bottom row to top
this.buffer = new byte[this.height][adjWidth];
for(int i = this.height - 1; i > 0; i--) {
    for(int j = adjWidth - 1; j > 0; j--) {
        this.buffer[i][j] = iData[adjWidth*i + j];
        System.out.print(this.buffer[i][j] + " ");
    }
    System.out.println();
}

但是,当我根据我正在加载的文件的十六进制编辑器进行检查时,我的输出不正确。我究竟做错了什么?

1 个答案:

答案 0 :(得分:0)

请记住,如果您正在读取字节是不同的读取整数,在这种情况下,一个样本或像素(整数)需要4(四)个字节......

已编辑代码

  BufferedImage BufImgEnt0 = null;
  BufImgEnt0 = ImageIO.read(new File("..."));  // Need Try..Catch

  int OneDArray[] = new int[BufImgEnt0.getWidth()*BufImgEnt0.getHeight()];


  byte bufferR = new byte[BufImgEnt0.getWidth()][BufImgEnt0.getHeight()];
  byte bufferG = new byte[BufImgEnt0.getWidth()][BufImgEnt0.getHeight()];
  byte bufferB = new byte[BufImgEnt0.getWidth()][BufImgEnt0.getHeight()];
  byte bufferA = new byte[BufImgEnt0.getWidth()][BufImgEnt0.getHeight()];

  int RGBA;
  for (int i = 0; i<BufImgEnt0.getWidth();i++){//Begin for i
    for (int j = 0; j<BufImgEnt0.getHeight();j++){//Begin for j
      RGBA = BufImgEnt0.getRGB(i, j);  //Here you have already 2D array

      OneDArray[i*BufImgEnt0.getHeight()+j] = BufImgEnt0.getRGB(i, j); //To One Array 

      bufferR[i][j] = (byte)getR(RGBA);
      bufferG[i][j] = (byte)getG(RGBA);
      bufferB[i][j] = (byte)getB(RGBA);
      bufferA[i][j] = (byte)getAlpha(RGBA);
    }//End for j
  }//End For i


private int getB(int RGB){
  return (RGB>>0)&0xFF;
}
private int getG(int RGB){
  return (RGB>>8)&0xFF;
}
private int getR(int RGB){
  return (RGB>>16)&0xFF;
}
private int getAlpha(int RGB){
  return (RGB>>24)&0xFF;
}

检查你的代码,大小是heightxWidth x 4,每个像素需要4个字节...