如何从位图中读取图像数据并将其存储在二维数组中?
问题描述:
我想将像素数据加载到二维数组中。我已经加载了头文件,所以iData数组以一维数组的形式保存字节的图像数据,但我希望它在一个二维数组中。 adjWidth是包含00字节填充的宽度。如何从位图中读取图像数据并将其存储在二维数组中?
// 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,当我根据正在加载的文件的十六进制编辑器检查它时,我的输出不正确。我究竟做错了什么?
答
请记住,如果正在读的字节是不同的阅读整数,此情况下,一个样本或像素(整数)需要4(四)个字节...
CODE EDITED
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,尺寸是heightxWidth x 4,每个像素需要4个字节...