如何在java中通过Bilinear Interpolation缩小图像？

我正在尝试读取图像，将其放大到80 * 60，然后通过双线性插值方法将结果图像缩小5次。 但我收到此错误：线程“main”中的exceptionjava.lang.ArrayIndexOutOfBoundsException：4800。 有人可以帮我吗？

这就是我所做的：

import java.awt.Color; import java.awt.Graphics2D; import java.awt.Image; import java.awt.RenderingHints; import java.awt.image.BufferedImage; import java.awt.image.DataBufferByte; import java.awt.image.WritableRaster; import java.io.ByteArrayInputStream; import java.io.File; import java.io.IOException; import java.io.InputStream; import javax.imageio.ImageIO; public class BiInterpolationTest { public static int zh; public static int zw; public static void main(String[] args) throws IOException { // TODO Auto-generated method stub int[][] savedImage; File f = new File ("F:\\Java\\Gray Scale Images\\3.jpg"); savedImage = readimage(f); BufferedImage grayImage = new BufferedImage(savedImage.length, savedImage[0].length, BufferedImage.TYPE_BYTE_GRAY); for (int i =0 ; i<savedImage.length ; i ++){ for (int j=0 ; j<savedImage[0].length ; j++){ int rgb = savedImage[i][j]; rgb = (rgb<<16)|(rgb<<8)|(rgb); grayImage.setRGB(i, j, rgb); BufferedImage zoomin =ScaledImage(grayImage, 80,60); zh = zoomin.getHeight(); zw = zoomin.getWidth(); byte[] tempArr; tempArr = extractBytes(zoomin); // TODO Auto-generated catch block byte [] zoomout; zoomout = bilineraInterpolation(tempArr , 5); InputStream in = new ByteArrayInputStream(zoomout); BufferedImage bImageInterpolated; try { bImageInterpolated = ImageIO.read(in); ImageIO.write(bImageInterpolated, "jpg", new File( "F:/new-darksouls.jpg")); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } } public static BufferedImage ScaledImage(Image img, int w , int h){ BufferedImage resizedImage = new BufferedImage(w , h , BufferedImage.TYPE_BYTE_GRAY); Graphics2D g2 = resizedImage.createGraphics(); g2.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR); g2.drawImage(img, 0, 0, w, h, null); g2.dispose(); return resizedImage; } ///////////////////////////////////// public static byte[] extractBytes (BufferedImage Image) throws IOException { BufferedImage bufferedImage = new BufferedImage(Image.getHeight(), Image.getWidth(), BufferedImage.TYPE_BYTE_GRAY); // get DataBufferBytes from Raster WritableRaster raster = bufferedImage .getRaster(); DataBufferByte data = (DataBufferByte) raster.getDataBuffer(); return ( data.getData() ); } public static int[][] readimage(File filename){ BufferedImage img; try { img = ImageIO.read(filename); // Gray_scaled Image output int width = img.getWidth(); int height = img.getHeight(); ImagePro.fw=width; ImagePro.fh = height; int [][] readimageVal = new int [width][height]; for (int i = 0; i<height ; i++){ for (int j =0 ; j<width ; j++){ Color c = new Color(img.getRGB(j, i)); int r= (int)(c.getRed() * 0.299)&0xff; int g = (int)(c.getGreen() * 0.587)&0xff; int b = (int)(c.getBlue() *0.114)&0xff; int avg = ((r+b+g)); readimageVal[j][i] = avg; } } return readimageVal; } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return null; } public static byte[] bilineraInterpolation(byte[] ImgData, int ratio) { int wf = zw*ratio; int hf = zh*ratio; byte[] tempArr = new byte[wf*hf] ; int A, B, C, D, x, y, index, g ; float x_ratio = ((float)(zw))/wf ; float y_ratio = ((float)(zh))/hf ; float x_diff, y_diff ; int in = 0 ; for (int i=0;i<hf;i++) { for (int j=0;j<wf;j++) { x = (int)(x_ratio * j) ; y = (int)(y_ratio * i) ; x_diff = (x_ratio * j) - x ; y_diff = (y_ratio * i) - y ; index = y*zw+x ; // range is 0 to 255 thus bitwise AND with 0xff A = ImgData[index] & 0xff ; B = ImgData[index+1] & 0xff ; C = ImgData[index+zw] & 0xff ; D = ImgData[index+zw+1] & 0xff ; g = (int)( A*(1-x_diff)*(1-y_diff) + B*(x_diff)*(1-y_diff) + C*(y_diff)*(1-x_diff) + D*(x_diff*y_diff) ) ; tempArr[in++] = (byte) g ; } } return tempArr ; } }