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新的图像压缩算法，提高了性能 (2006-09-15 08:42:37)
package src;
import java.awt.image.BufferedImage; import java.io.DataOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException;
import com.mullassery.imaging.Imaging; import com.mullassery.imaging.ImagingFactory; import com.sun.image.codec.jpeg.JPEGCodec; import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class NewScaleImage {
int width = 0;
int height = 0;
private String destFile; private String srcFileName;
BufferedImage srcBufferImage;
private int[] rgbArray = null;
private static Imaging tool = new ImagingFactory() .createImagingInstance(ImagingFactory.JAVA2D);
public NewScaleImage(String fileName) throws IOException { this(new File(fileName)); }
public NewScaleImage(File file) throws IOException { String srcFile = file.getName(); String srcFilePath = file.getAbsolutePath(); this.destFile = srcFile.substring(0, srcFile.lastIndexOf(".")) + ".jpg"; // img = javax.imageio.ImageIO.read(file); srcBufferImage = tool.read(new File(srcFilePath)); // ImageIO.write((RenderedImage) srcBufferImage, "bmp", new File("E:\\temp1\\testSrc.bmp")); width = srcBufferImage.getWidth(); height = srcBufferImage.getHeight(); } public NewScaleImage() throws IOException{
}
public BufferedImage scaleImage(int outWidth, int outHeight) { int width = srcBufferImage.getWidth(); int height = srcBufferImage.getHeight(); rgbArray = srcBufferImage.getRGB(0, 0, width, height, null, 0, width); if (DetermineResultSize(outWidth, outHeight) == 1) { return srcBufferImage; }
BufferedImage pbFinalOut = new BufferedImage(outWidth, outHeight, BufferedImage.TYPE_INT_RGB);
double hScale = ((double) width) / ((double) outWidth); double vScale = ((double) height) / ((double) outHeight);
int winX0, winY0, winX1, winY1; int valueRGB = 0; long R, G, B; int x, y, i, j; int n;
for (y = 0; y < outHeight; y++) { System.out.println("y :"+ y); winY0 = (int) (y * vScale + 0.5); if (winY0 < 0) { winY0 = 0; } winY1 = (int) (winY0 + vScale + 0.5); if (winY1 > height) { winY1 = height; } System.out.println("winY0 :"+ winY0); System.out.println("winY1 :"+ winY1);
for (x = 0; x < outWidth; x++) { System.out.println(" x :"+ x); winX0 = (int) (x * hScale + 0.5); if (winX0 < 0) { winX0 = 0; } winX1 = (int) (winX0 + hScale + 0.5); if (winX1 > width) { winX1 = width; } System.out.println(" winX0 :"+ winX0); System.out.println(" winX1 :"+ winX1);
R = 0; G = 0; B = 0; for (i = winX0; i < winX1; i++) { System.out.println(" i :"+ i); for (j = winY0; j < winY1; j++) { valueRGB = rgbArray[width * j + i];
R += GetRedValue(valueRGB); G += GetGreenValue(valueRGB); B += GetBlueValue(valueRGB); System.out.println(" reb-> j :"+ j);
} } n = (winX1 - winX0) * (winY1 - winY0); R = (int) (((double) R) / n + 0.5); G = (int) (((double) G) / n + 0.5); B = (int) (((double) B) / n + 0.5);
valueRGB = ComRGB(Clip((int) R), Clip((int) G), Clip((int) B)); pbFinalOut.setRGB(x, y, valueRGB); } }
return pbFinalOut; }
/** * 决定图像尺寸 */ public int DetermineResultSize(int w, int h) { double scaleH, scaleV; scaleH = (double) w / (double) width; scaleV = (double) h / (double) height;
// 判断一下scaleH，scaleV，不做放大操作 if (scaleH >= 1.0 && scaleV >= 1.0) { return 1; }
return 0;
} // end of DetermineResultSize()
int Clip(int x) { if (x < 0) return 0; if (x > 255) return 255; return x; }
private int GetRedValue(int rgbValue) { int temp = rgbValue & 0x00ff0000; return temp >> 16; }
private int GetGreenValue(int rgbValue) { int temp = rgbValue & 0x0000ff00; return temp >> 8; }
private int GetBlueValue(int rgbValue) { return rgbValue & 0x000000ff; }
private int ComRGB(int redValue, int greenValue, int blueValue) {
return (redValue << 16) + (greenValue << 8) + blueValue; }
public void resize(int w, int h) throws IOException {
File srcFile = new File(srcFileName); srcBufferImage = tool.read(srcFile); width = srcBufferImage.getWidth(); height = srcBufferImage.getHeight();
rgbArray = srcBufferImage.getRGB(0, 0, width, height, null, 0, width); BufferedImage _image = scaleImage(w, h);
FileOutputStream out = new FileOutputStream(destFile); JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(_image); out.close(); }
public void resizeByWidth(int w) throws IOException { float h = ((float) height * w / width); resize(w, new Float(h).intValue()); }
public void resizeByHeight(int h) throws IOException { float w = ((float) width * h / height); resize(new Float(w).intValue(), h); }
public void resizeFix(int w, int h) throws IOException { if (width <= w && height <= h) { resize(width, height); return; }
if ((float) width / height > (float) w / h) { resizeByWidth(w); } else { resizeByHeight(h); } }
public void setDestFile(String fileName) { destFile = fileName; }
public String getDestFile() { return destFile; }
public static void main(String[] args) {
long cycleStartTime = System.currentTimeMillis(); long cycleEndTime = System.currentTimeMillis(); try { FileOutputStream file1 = new FileOutputStream( "E:\\temp4\\result_newJava.txt"); DataOutputStream dos = new DataOutputStream(file1); NewScaleImage thum = new NewScaleImage(); for (int i = 5; i < 7; i++) { String srcName = "test" + i; String thumbnailFile = ""; try { cycleStartTime = System.currentTimeMillis(); thum.setSrcFileName("E:\\temp4\\" + srcName + ".jpg"); thumbnailFile = "E:\\temp4\\" + srcName + "_400x400.jpg"; thum.setDestFile(thumbnailFile); thum.resizeFix(400, 400);
thum.setSrcFileName("E:\\temp4\\" + srcName + "_400x400.jpg"); thumbnailFile = "E:\\temp4\\" + srcName + "_200x200.jpg"; thum.setDestFile(thumbnailFile); thum.resizeFix(200, 200);
thum.setSrcFileName("E:\\temp4\\" + srcName + "_400x400.jpg"); thumbnailFile = "E:\\temp4\\" + srcName + "_100x100.jpg"; thum.setDestFile(thumbnailFile); thum.resizeFix(100, 100);
thum.setSrcFileName("E:\\temp4\\" + srcName + "_400x400.jpg"); thumbnailFile = "E:\\temp4\\" + srcName + "_50x50.jpg"; thum.setDestFile(thumbnailFile); thum.resizeFix(50,50);
cycleEndTime = System.currentTimeMillis(); dos.writeBytes(i + ":" + (cycleEndTime - cycleStartTime)); dos.writeBytes("\r\n"); System.out.println(i + ":" + (cycleEndTime - cycleStartTime)); } catch (Exception e) { // TODO: handle exception } } dos.close(); file1.close(); } catch (Exception e) { // TODO: handle exception } System.out.println("finish;"); }
public String getSrcFileName() { return srcFileName; }
public void setSrcFileName(String srcFileName) { this.srcFileName = srcFileName; } }
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