如何在 Java 中拼接图像对象

Question

我有一个场景，我从地图服务器获取许多图块（例如 12）。现在，对于缓冲和离线功能，我需要将它们全部重新连接起来，这样我们就必须处理 1 个单个图像对象而不是 12 个。我尝试在没有 JAI 的情况下做到这一点，我的代码如下。

package imagemerge;


import java.awt.*;
import java.awt.image.*;
import java.awt.event.*;

public class ImageSticher extends WindowAdapter {

    Image tile1;
    Image tile2;
    Image result;
    ColorModel colorModel;
    int width,height,widthr,heightr;
    //int t1,t2;
    int t12[];


    public ImageSticher()
    {

    }

    public ImageSticher (Image img1,Image img2,int w,int h)
    {
        tile1=img1;
        tile2=img2;

        width=w;
        height=h;
        colorModel=ColorModel.getRGBdefault();

    }

    public Image horizontalStich() throws Exception
    {

        widthr=width*2;
        heightr=height;

        t12=new int[widthr *  heightr];

        int t1[]=new int[width*height];
        PixelGrabber p1 =new PixelGrabber(tile1, 0, 0, width, height, t1, 0, width);
        p1.grabPixels();

        int t2[]=new int[width*height];
        PixelGrabber p2 =new PixelGrabber(tile2, 0, 0, width, height, t1, 0, width);
        p2.grabPixels();

        int y, x, rp, rpi;
        int red1, red2, redr;
        int green1, green2, greenr;
        int blue1, blue2, bluer;
        int alpha1, alpha2, alphar;

        for(y=0;y<heightr;y++)
        {
            for(x=0;x<widthr;x++)
            {
                //System.out.println(x);
                rpi=y*widthr+x; // index of resulting pixel;
                rp=0;           //initializing resulting pixel
                System.out.println(rpi);

                if(x<(widthr/2)) // x is less than width , copy first tile
                {
                    //System.out.println("tile1="+x);
                    blue1 = t1[rpi] & 0x00ff; // ERROR occurs here
                    green1=(t1[rpi] >> 8) & 0x00ff;
                    red1=(t1[rpi] >> 16) & 0x00ff;
                    alpha1 = (t1[rpi] >> 24) & 0x00ff;

                    redr = (int)(red1 * 1.0); // copying red band pixel into redresult,,,,1.0 is the alpha valye
                    redr = (redr < 0)?(0):((redr>255)?(255):(redr));
                    greenr = (int)(green1 * 1.0); //
                    redr = (int)(red1 * 1.0); //
                    greenr = (greenr < 0)?(0):((greenr>255)?(255):(greenr));
                    bluer = (int)(blue1 * 1.0);
                    bluer =  (bluer < 0)?(0):((bluer>255)?(255):(bluer));
                    alphar = 255;

                    //resulting pixel computed
                    rp = (((((alphar << 8) + (redr & 0x0ff)) << 8) + (greenr & 0x0ff)) << 8) + (bluer & 0x0ff);


                }
                else // index is ahead of half way...copy second tile
                {

                    blue2 = t2[rpi] & 0x00ff; // blue band bit of first tile
                    green2=(t2[rpi] >> 8) & 0x00ff;
                    red2=(t2[rpi] >> 16) & 0x00ff;
                    alpha2 = (t2[rpi] >> 24) & 0x00ff;

                    redr = (int)(red2 * 1.0); // copying red band pixel into redresult,,,,1.0 is the alpha valye
                    redr = (redr < 0)?(0):((redr>255)?(255):(redr));
                    greenr = (int)(green2 * 1.0); //
                    redr = (int)(red2 * 1.0); //
                    greenr = (greenr < 0)?(0):((greenr>255)?(255):(greenr));
                    bluer = (int)(blue2 * 1.0);
                    bluer =  (bluer < 0)?(0):((bluer>255)?(255):(bluer));
                    alphar = 255;

                    //resulting pixel computed
                    rp = (((((alphar << 8) + (redr & 0x0ff)) << 8) + (greenr & 0x0ff)) << 8) + (bluer & 0x0ff);


                }
                t12[rpi] = rp; // copying resulting pixel in the result int array which will be converted to image

            }
        }

        MemoryImageSource mis;
        if (t12!=null) {
            mis = new MemoryImageSource(widthr, heightr, colorModel, t12, 0, widthr);
            result = Toolkit.getDefaultToolkit().createImage(mis);
            return result;

        }
        return null;

    }





}

现在检查我的理论，我正在尝试水平连接或缝合两个图块，但我收到错误：

java.lang.ArrayIndexOutOfBoundsException：90000 在 imagemerge.ImageSticher.horizo​​ntalStich(ImageSticher.java:69) 在 imageStream.ImageStream.getImage(ImageStream.java:75) 在 imageStream.ImageStream.main(ImageStream.java:28)

处存在某种限制，因为当水平拼接两个 300 x 300 的图像时，这意味着生成的图像将为 600 x 300 ...这将使 180000 索引大小，但其在 90000 处给出错误，我在这里做错了什么

Answer 1

rpi 是结果像素的索引，而不是 t1 中源图块数据的索引，后者大小是一半。