使用Java从图像获取像素数据

Question

我正在尝试从64 x 48位图获取像素rgb值。我得到了一些价值，但远没有达到3072 (= 64 x 48)我期望的价值。我也得到：

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: Coordinate out of bounds!
at sun.awt.image.ByteInterleavedRaster.getDataElements(ByteInterleavedRaster.java:301)
at java.awt.image.BufferedImage.getRGB(BufferedImage.java:871)
at imagetesting.Main.getPixelData(Main.java:45)
at imagetesting.Main.main(Main.java:27)

我找不到界外错误…

这是代码：

package imagetesting;

import java.io.IOException;
import javax.imageio.ImageIO;
import java.io.File;
import java.awt.image.BufferedImage;



public class Main {

public static final String IMG = "matty.jpg";

public static void main(String[] args) {

    BufferedImage img;

    try {
        img = ImageIO.read(new File(IMG));

        int[][] pixelData = new int[img.getHeight() * img.getWidth()][3];
        int[] rgb;

        int counter = 0;
        for(int i = 0; i < img.getHeight(); i++){
            for(int j = 0; j < img.getWidth(); j++){
                rgb = getPixelData(img, i, j);

                for(int k = 0; k < rgb.length; k++){
                    pixelData[counter][k] = rgb[k];
                }

                counter++;
            }
        }


    } catch (IOException e) {
        e.printStackTrace();
    }

}

private static int[] getPixelData(BufferedImage img, int x, int y) {
int argb = img.getRGB(x, y);

int rgb[] = new int[] {
    (argb >> 16) & 0xff, //red
    (argb >>  8) & 0xff, //green
    (argb      ) & 0xff  //blue
};

System.out.println("rgb: " + rgb[0] + " " + rgb[1] + " " + rgb[2]);
return rgb;
}

}

Answer 1

这个：

for(int i = 0; i < img.getHeight(); i++){
    for(int j = 0; j < img.getWidth(); j++){
        rgb = getPixelData(img, i, j);

与此不符：

private static int[] getPixelData(BufferedImage img, int x, int y) {

你已经i计数的行和j列，即i包含 ÿ 值和j包含 X 的值。那是倒退。