Question

有一个非常简单的.jpg图像，我想将其转换为矩阵。但是使用getRGB（i，j）指向像素会给ArrayIndexOutOfBounds提供运行时异常。以下代码的图像大小是否有任何限制？它只是显示它在整个图像中获得的第一个颜色代码。

// This will be the testing variable, where in the actual script
// we'll check the response code of file_get_contents 
$count = 0;

function funcTwo( &$count ) {

    // Here I'd run file_get_contents and parse the headers
    $count = ++$count;
    echo "functTwo() running $count... \n";             

    // Here I'll test for response code 429, if true, restart
    if ($count !== 5) {
        echo "Count only = $count so we're gonna take a nap... \n";
        sleep(1);           
        echo "Waking from sleep $count and rerunning myself... \n";
        funcTwo($count);
        return;
    }

    echo "Count finally = $count, exiting funcTwo... \n";

}

// This function does the main work that relies on the successful response from 
function funcOne( $count ) {

    echo "functOne() running! \n";

    // The function will be delayed here until a successful response is returned
    funcTwo($count);

    echo "Count finally = $count, so now we can finally do the work that \n";
    echo "depends on a successful response from funcTwo() \n";

    // Do main work

    echo "Work done, exiting funcOne and script... \n";

}

funcOne($count);

然后我应用了嵌套的for循环并使用了

BufferedImage img=ImageIO.read(new File("stars.jpg"));
int pix[][]= new int[img.getHeight()][img.getWidth()];

Answer 1

这个功能正是你提到的，它对我来说很好。我相信你可能在你的嵌套for循环中做错了。

 public int[][] getMatrixOfImage(BufferedImage bufferedImage) {
    int width = bufferedImage.getWidth(null);
    int height = bufferedImage.getHeight(null);
    int[][] pixels = new int[width][height];
    for (int i = 0; i < width; i++) {
        for (int j = 0; j < height; j++) {
            pixels[i][j] = bufferedImage.getRGB(i, j);
        }
    }

    return pixels;
}

Answer 2

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

public class ImageUtil {

    public static Color[][] loadPixelsFromFile(File file) throws IOException {

        BufferedImage image = ImageIO.read(file);
        Color[][] colors = new Color[image.getWidth()][image.getHeight()];

        for (int x = 0; x < image.getWidth(); x++) {
            for (int y = 0; y < image.getHeight(); y++) {
                colors[x][y] = new Color(image.getRGB(x, y));
            }
        }

        return colors;
    }

    public static void main(String[] args) throws IOException {
        Color[][] colors = loadPixelsFromFile(new File("stars.jpg"));
        System.out.println("Color[0][0] = " + colors[0][0]);
    }
}

Answer 3

您可能交换了宽度和高度。

尝试替换

int pix[][]= new int[img.getHeight()][img.getWidth()];

与

int pix[][]= new int[img.getWidth()][img.getHeight()]; // <--- width first

java图像转换为矩阵

3 个答案: