java生成二维码图片清晰度问题
我的程序生成的二维码图片很模糊，用二维码生成器生成的图片很清晰，请问如何设置图片的清晰度呢？
如图，两张清晰度差别甚大！
望高手不吝赐教！非常感谢！！！
部分源码：
/**
* 生成二维码(QRCode)图片的公共方法
* @param content 存储内容
* @param imgType 图片类型
* @param size 二维码尺寸
* @return
*/
private BufferedImage qRCodeCommon(String content, String imgType, int size) {
BufferedImage bufImg = null;
try {
Qrcode qrcodeHandler = new Qrcode();
// 设置二维码排错率，可选L(7%)、M(15%)、Q(25%)、H(30%)，排错率越高可存储的信息越少，但对二维码清晰度的要求越小
qrcodeHandler.setQrcodeErrorCorrect('M');
qrcodeHandler.setQrcodeEncodeMode('B');
// 设置设置二维码尺寸，取值范围1-40，值越大尺寸越大，可存储的信息越大
qrcodeHandler.setQrcodeVersion(size);
// 获得内容的字节数组，设置编码格式
byte[] contentBytes = content.getBytes("utf-8");
// 图片尺寸
int imgSize = 67 + 12 * (size - 1);
bufImg = new BufferedImage(imgSize, imgSize, BufferedImage.TYPE_INT_RGB);
Graphics2D gs = bufImg.createGraphics();
// 设置背景颜色
gs.setBackground(Color.WHITE);
gs.clearRect(0, 0, imgSize, imgSize);
// 设定图像颜色> BLACK
gs.setColor(Color.BLACK);
// 设置偏移量，不设置可能导致解析出错
int pixoff = 2;
// 输出内容> 二维码
if (contentBytes.length > 0 && contentBytes.length < 800) {
boolean[][] codeOut = qrcodeHandler.calQrcode(contentBytes);
for (int i = 0; i < codeOut.length; i++) {
for (int j = 0; j < codeOut.length; j++) {
if (codeOut[j][i]) {
gs.fillRect(j * 3 + pixoff, i * 3 + pixoff, 3, 3);
}
}
}
} else {
throw new Exception("QRCode content bytes length = " + contentBytes.length + " not in [0, 800].");
}
gs.dispose();
bufImg.flush();
} catch (Exception e) {
e.printStackTrace();
}
return bufImg;
} 二维码?
[解决办法]
最后需要对图像处理一下，让白的更白，黑的更黑，图片只有两种颜色，(0, 0, 0), (255, 255, 255)，没有任何其他中间颜色。Java有函数操作卷积算法，对图像进行处理，例如模糊，锐化，浮雕等。
这有个简单的处理图像的程序，可以参考一下：
package com.tur.demo;
import javax.swing.*;
import java.awt.*;
import java.awt.color.ColorSpace;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.image.*;
import java.io.IOException;
public class ImageFilterTest {
private static ImageFilter imageFilter = new ImageFilter("/Users/Biao/Desktop/x.png");
private static JLabel imageLabel = new JLabel();
private static enum FilterType {
ORIGINAL("Original Image"),
GRAY("Gray Image"),
BLUR("Blur Image"),
SHARP("Sharp Image"),
EMBOSS("Emboss Image");
private String description;
private FilterType(String description) {
this.description = description;
}
@Override
public String toString() {
return description;
}
};
public static JButton createImageFilterButton(final FilterType type) {
JButton button = new JButton(type.toString());
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
Image image = null;
switch (type) {
case ORIGINAL:
image = imageFilter.getOriginalImage();
break;
case GRAY:
image = imageFilter.getGrayImage();
break;
case BLUR:
image = imageFilter.getBlurImage();
break;
case SHARP:
image = imageFilter.getSharpImage();
break;
case EMBOSS:
image = imageFilter.getEmbossImage();
break;
default:
image = imageFilter.getOriginalImage();
break;
}
imageLabel.setIcon(new ImageIcon(image));
}
});
return button;
}
private static void createAndShowGui() throws IOException {
JFrame frame = new JFrame("Image filter");
imageLabel.setIcon(new ImageIcon(imageFilter.getOriginalImage()));
frame.getContentPane().add(imageLabel, BorderLayout.CENTER);
JPanel buttonsPanel = new JPanel(new GridLayout(2, 3));
buttonsPanel.add(createImageFilterButton(FilterType.ORIGINAL));
buttonsPanel.add(createImageFilterButton(FilterType.GRAY));
buttonsPanel.add(createImageFilterButton(FilterType.BLUR));
buttonsPanel.add(createImageFilterButton(FilterType.SHARP));
buttonsPanel.add(createImageFilterButton(FilterType.EMBOSS));
frame.getContentPane().add(buttonsPanel, BorderLayout.SOUTH);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(500, 500);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) throws Exception {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
try {
createAndShowGui();
} catch (IOException e) {
e.printStackTrace();
}
}
});
}
}
class ImageFilter {
private BufferedImage bufImage;
public ImageFilter(String imagePath) {
bufImage = imageToBufferedImage(new ImageIcon(imagePath).getImage());
}
public BufferedImage getOriginalImage() {
return bufImage;
}
public BufferedImage getSharpImage() {
Kernel kernel = new Kernel(3, 3, new float[]{
-1, -1, -1,
-1, 9, -1,
-1, -1, -1
});
BufferedImageOp op = new ConvolveOp(kernel);
return op.filter(bufImage, null);
}
public BufferedImage getBlurImage() {
Kernel kernel = new Kernel(3, 3, new float[]{
1f / 9f, 1f / 9f, 1f / 9f,
1f / 9f, 1f / 9f, 1f / 9f,
1f / 9f, 1f / 9f, 1f / 9f
});
BufferedImageOp op = new ConvolveOp(kernel);
return op.filter(bufImage, null);
}
public BufferedImage getGrayImage() {
ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);
ColorConvertOp op = new ColorConvertOp(cs, null);
return op.filter(bufImage, null);
}
public BufferedImage getEmbossGrayImage() {
Kernel kernel = new Kernel(3, 3, new float[]{
-2, 0, 0,
0, 1, 0,
0, 0, 2
});
BufferedImageOp op = new ConvolveOp(kernel);
return op.filter(bufImage, null);
}
public BufferedImage getEmbossImage() {
Kernel kernel = new Kernel(3, 3, new float[]{
0, -1, 0,
-1, 5, -1,
0, -1, 0
});
BufferedImageOp op = new ConvolveOp(kernel);
return op.filter(bufImage, null);
}
/**
* Convert the image to an buffered image.
* @param image An instance of the class Image
* @return An instance of the class BufferedImage that is converted from an image.
*/
public static BufferedImage imageToBufferedImage(Image image) {
int width = image.getWidth(null);
int height = image.getHeight(null);
BufferedImage buf = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = buf.createGraphics();
g.drawImage(image, 0, 0, width, height, null);
g.dispose();
return buf;
}
}
