ZXing解析二维码

zxing 开发技巧：http://www.csdn.net/tag/zxing/blog

分类： 二维码 java 2015-05-15 21:07 177人阅读 评论(0)收藏举报

二维码ZXing解析二维码

  上一篇文件已经说过如何用ZXing进行生成二维码和带图片的二维码，下面说下如何解析二维码

二维码的解析和生成类似，也可以参考google的一个操作类 BufferedImageLuminanceSource类，该类可在google的测试包中找到，另外j2se中也有该类，你可以将该类直接拷贝到源码中使用，你也可以自己写个。

[java] view plaincopyprint?

1. import java.awt.Graphics2D;  
2. import java.awt.geom.AffineTransform;  
3. import java.awt.image.BufferedImage;  
4. import java.awt.image.WritableRaster;  
5. import com.google.zxing.LuminanceSource;  
6.   
7. /** 
8.  *  
9.  * 二维码的解析需要借助BufferedImageLuminanceSource类，该类是由Google提供的，可以将该类直接拷贝到源码中使用，当然你也可以自己写个 
10.  * 解析条形码的基类 
11.  */  
12.   
13. public final class BufferedImageLuminanceSource extends LuminanceSource {  
14.   
15.   private static final double MINUS_45_IN_RADIANS = -0.7853981633974483; // Math.toRadians(-45.0)  
16.   
17.   private final BufferedImage image;  
18.   private final int left;  
19.   private final int top;  
20.   
21.   private static final boolean EXPLICIT_LUMINANCE_CONVERSION;  
22.   static {  
23.     String property = System.getProperty("explicitLuminanceConversion");  
24.     if (property == null) {  
25.       property = System.getenv("EXPLICIT_LUMINANCE_CONVERSION");  
26.     }  
27.     EXPLICIT_LUMINANCE_CONVERSION = Boolean.parseBoolean(property);  
28.   }  
29.   
30.   public BufferedImageLuminanceSource(BufferedImage image) {  
31.     this(image, 0, 0, image.getWidth(), image.getHeight());  
32.   }  
33.   
34.   public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {  
35.     super(width, height);  
36.   
37.     if (image.getType() == BufferedImage.TYPE_BYTE_GRAY) {  
38.       this.image = image;  
39.     } else {  
40.       int sourceWidth = image.getWidth();  
41.       int sourceHeight = image.getHeight();  
42.       if (left + width > sourceWidth || top + height > sourceHeight) {  
43.         throw new IllegalArgumentException("Crop rectangle does not fit within image data.");  
44.       }  
45.   
46.       this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);  
47.   
48.       if (EXPLICIT_LUMINANCE_CONVERSION) {  
49.   
50.         WritableRaster raster = this.image.getRaster();  
51.         int[] buffer = new int[width];  
52.         for (int y = top; y < top + height; y++) {  
53.           image.getRGB(left, y, width, 1, buffer, 0, sourceWidth);  
54.           for (int x = 0; x < width; x++) {  
55.             int pixel = buffer[x];  
56.   
57.             // see comments in implicit branch  
58.             if ((pixel & 0xFF000000) == 0) {  
59.               pixel = 0xFFFFFFFF; // = white  
60.             }  
61.   
62.             // .229R + 0.587G + 0.114B (YUV/YIQ for PAL and NTSC)  
63.             buffer[x] =  
64.                 (306 * ((pixel >> 16) & 0xFF) +  
65.                  601 * ((pixel >> 8) & 0xFF) +  
66.                  117 * (pixel & 0xFF) +  
67.                  0x200) >> 10;  
68.           }  
69.           raster.setPixels(left, y, width, 1, buffer);  
70.         }  
71.   
72.       } else {  
73.   
74.         // The color of fully-transparent pixels is irrelevant. They are often, technically, fully-transparent  
75.         // black (0 alpha, and then 0 RGB). They are often used, of course as the "white" area in a  
76.         // barcode image. Force any such pixel to be white:  
77.         if (image.getAlphaRaster() != null) {  
78.           int[] buffer = new int[width];  
79.           for (int y = top; y < top + height; y++) {  
80.             image.getRGB(left, y, width, 1, buffer, 0, sourceWidth);  
81.             boolean rowChanged = false;  
82.             for (int x = 0; x < width; x++) {  
83.               if ((buffer[x] & 0xFF000000) == 0) {  
84.                 buffer[x] = 0xFFFFFFFF; // = white  
85.                 rowChanged = true;  
86.               }  
87.             }  
88.             if (rowChanged) {  
89.               image.setRGB(left, y, width, 1, buffer, 0, sourceWidth);  
90.             }  
91.           }  
92.         }  
93.   
94.         // Create a grayscale copy, no need to calculate the luminance manually  
95.         this.image.getGraphics().drawImage(image, 0, 0, null);  
96.   
97.       }  
98.     }  
99.     this.left = left;  
100.     this.top = top;  
101.   }  
102.   
103.   @Override  
104.   public byte[] getRow(int y, byte[] row) {  
105.     if (y < 0 || y >= getHeight()) {  
106.       throw new IllegalArgumentException("Requested row is outside the image: " + y);  
107.     }  
108.     int width = getWidth();  
109.     if (row == null || row.length < width) {  
110.       row = new byte[width];  
111.     }  
112.     // The underlying raster of image consists of bytes with the luminance values  
113.     image.getRaster().getDataElements(left, top + y, width, 1, row);  
114.     return row;  
115.   }  
116.   
117.   @Override  
118.   public byte[] getMatrix() {  
119.     int width = getWidth();  
120.     int height = getHeight();  
121.     int area = width * height;  
122.     byte[] matrix = new byte[area];  
123.     // The underlying raster of image consists of area bytes with the luminance values  
124.     image.getRaster().getDataElements(left, top, width, height, matrix);  
125.     return matrix;  
126.   }  
127.   
128.   @Override  
129.   public boolean isCropSupported() {  
130.     return true;  
131.   }  
132.   
133.   @Override  
134.   public LuminanceSource crop(int left, int top, int width, int height) {  
135.     return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);  
136.   }  
137.   
138.   /** 
139.    * This is always true, since the image is a gray-scale image. 
140.    * 
141.    * @return true 
142.    */  
143.   @Override  
144.   public boolean isRotateSupported() {  
145.     return true;  
146.   }  
147.   
148.   @Override  
149.   public LuminanceSource rotateCounterClockwise() {  
150.     int sourceWidth = image.getWidth();  
151.     int sourceHeight = image.getHeight();  
152.   
153.     // Rotate 90 degrees counterclockwise.  
154.     AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);  
155.   
156.     // Note width/height are flipped since we are rotating 90 degrees.  
157.     BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);  
158.   
159.     // Draw the original image into rotated, via transformation  
160.     Graphics2D g = rotatedImage.createGraphics();  
161.     g.drawImage(image, transform, null);  
162.     g.dispose();  
163.   
164.     // Maintain the cropped region, but rotate it too.  
165.     int width = getWidth();  
166.     return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);  
167.   }  
168.   
169.   @Override  
170.   public LuminanceSource rotateCounterClockwise45() {  
171.     int width = getWidth();  
172.     int height = getHeight();  
173.   
174.     int oldCenterX = left + width / 2;  
175.     int oldCenterY = top + height / 2;  
176.   
177.     // Rotate 45 degrees counterclockwise.  
178.     AffineTransform transform = AffineTransform.getRotateInstance(MINUS_45_IN_RADIANS, oldCenterX, oldCenterY);  
179.   
180.     int sourceDimension = Math.max(image.getWidth(), image.getHeight());  
181.     BufferedImage rotatedImage = new BufferedImage(sourceDimension, sourceDimension, BufferedImage.TYPE_BYTE_GRAY);  
182.   
183.     // Draw the original image into rotated, via transformation  
184.     Graphics2D g = rotatedImage.createGraphics();  
185.     g.drawImage(image, transform, null);  
186.     g.dispose();  
187.   
188.     int halfDimension = Math.max(width, height) / 2;  
189.     int newLeft = Math.max(0, oldCenterX - halfDimension);  
190.     int newTop = Math.max(0, oldCenterY - halfDimension);  
191.     int newRight = Math.min(sourceDimension - 1, oldCenterX + halfDimension);  
192.     int newBottom = Math.min(sourceDimension - 1, oldCenterY + halfDimension);  
193.   
194.     return new BufferedImageLuminanceSource(rotatedImage, newLeft, newTop, newRight - newLeft, newBottom - newTop);  
195.   }  
196.   
197. }  

import java.awt.Graphics2D;import java.awt.geom.AffineTransform;import java.awt.image.BufferedImage;import java.awt.image.WritableRaster;import com.google.zxing.LuminanceSource;/** *  * 二维码的解析需要借助BufferedImageLuminanceSource类，该类是由Google提供的，可以将该类直接拷贝到源码中使用，当然你也可以自己写个 * 解析条形码的基类 */public final class BufferedImageLuminanceSource extends LuminanceSource {  private static final double MINUS_45_IN_RADIANS = -0.7853981633974483; // Math.toRadians(-45.0)  private final BufferedImage image;  private final int left;  private final int top;  private static final boolean EXPLICIT_LUMINANCE_CONVERSION;  static {    String property = System.getProperty("explicitLuminanceConversion");    if (property == null) {      property = System.getenv("EXPLICIT_LUMINANCE_CONVERSION");    }    EXPLICIT_LUMINANCE_CONVERSION = Boolean.parseBoolean(property);  }  public BufferedImageLuminanceSource(BufferedImage image) {    this(image, 0, 0, image.getWidth(), image.getHeight());  }  public BufferedImageLuminanceSource(BufferedImage image, int left, int top, int width, int height) {    super(width, height);    if (image.getType() == BufferedImage.TYPE_BYTE_GRAY) {      this.image = image;    } else {      int sourceWidth = image.getWidth();      int sourceHeight = image.getHeight();      if (left + width > sourceWidth || top + height > sourceHeight) {        throw new IllegalArgumentException("Crop rectangle does not fit within image data.");      }      this.image = new BufferedImage(sourceWidth, sourceHeight, BufferedImage.TYPE_BYTE_GRAY);      if (EXPLICIT_LUMINANCE_CONVERSION) {        WritableRaster raster = this.image.getRaster();        int[] buffer = new int[width];        for (int y = top; y < top + height; y++) {          image.getRGB(left, y, width, 1, buffer, 0, sourceWidth);          for (int x = 0; x < width; x++) {            int pixel = buffer[x];            // see comments in implicit branch            if ((pixel & 0xFF000000) == 0) {              pixel = 0xFFFFFFFF; // = white            }            // .229R + 0.587G + 0.114B (YUV/YIQ for PAL and NTSC)            buffer[x] =                (306 * ((pixel >> 16) & 0xFF) +                 601 * ((pixel >> 8) & 0xFF) +                 117 * (pixel & 0xFF) +                 0x200) >> 10;          }          raster.setPixels(left, y, width, 1, buffer);        }      } else {        // The color of fully-transparent pixels is irrelevant. They are often, technically, fully-transparent        // black (0 alpha, and then 0 RGB). They are often used, of course as the "white" area in a        // barcode image. Force any such pixel to be white:        if (image.getAlphaRaster() != null) {          int[] buffer = new int[width];          for (int y = top; y < top + height; y++) {            image.getRGB(left, y, width, 1, buffer, 0, sourceWidth);            boolean rowChanged = false;            for (int x = 0; x < width; x++) {              if ((buffer[x] & 0xFF000000) == 0) {                buffer[x] = 0xFFFFFFFF; // = white                rowChanged = true;              }            }            if (rowChanged) {              image.setRGB(left, y, width, 1, buffer, 0, sourceWidth);            }          }        }        // Create a grayscale copy, no need to calculate the luminance manually        this.image.getGraphics().drawImage(image, 0, 0, null);      }    }    this.left = left;    this.top = top;  }  @Override  public byte[] getRow(int y, byte[] row) {    if (y < 0 || y >= getHeight()) {      throw new IllegalArgumentException("Requested row is outside the image: " + y);    }    int width = getWidth();    if (row == null || row.length < width) {      row = new byte[width];    }    // The underlying raster of image consists of bytes with the luminance values    image.getRaster().getDataElements(left, top + y, width, 1, row);    return row;  }  @Override  public byte[] getMatrix() {    int width = getWidth();    int height = getHeight();    int area = width * height;    byte[] matrix = new byte[area];    // The underlying raster of image consists of area bytes with the luminance values    image.getRaster().getDataElements(left, top, width, height, matrix);    return matrix;  }  @Override  public boolean isCropSupported() {    return true;  }  @Override  public LuminanceSource crop(int left, int top, int width, int height) {    return new BufferedImageLuminanceSource(image, this.left + left, this.top + top, width, height);  }  /**   * This is always true, since the image is a gray-scale image.   *   * @return true   */  @Override  public boolean isRotateSupported() {    return true;  }  @Override  public LuminanceSource rotateCounterClockwise() {    int sourceWidth = image.getWidth();    int sourceHeight = image.getHeight();    // Rotate 90 degrees counterclockwise.    AffineTransform transform = new AffineTransform(0.0, -1.0, 1.0, 0.0, 0.0, sourceWidth);    // Note width/height are flipped since we are rotating 90 degrees.    BufferedImage rotatedImage = new BufferedImage(sourceHeight, sourceWidth, BufferedImage.TYPE_BYTE_GRAY);    // Draw the original image into rotated, via transformation    Graphics2D g = rotatedImage.createGraphics();    g.drawImage(image, transform, null);    g.dispose();    // Maintain the cropped region, but rotate it too.    int width = getWidth();    return new BufferedImageLuminanceSource(rotatedImage, top, sourceWidth - (left + width), getHeight(), width);  }  @Override  public LuminanceSource rotateCounterClockwise45() {    int width = getWidth();    int height = getHeight();    int oldCenterX = left + width / 2;    int oldCenterY = top + height / 2;    // Rotate 45 degrees counterclockwise.    AffineTransform transform = AffineTransform.getRotateInstance(MINUS_45_IN_RADIANS, oldCenterX, oldCenterY);    int sourceDimension = Math.max(image.getWidth(), image.getHeight());    BufferedImage rotatedImage = new BufferedImage(sourceDimension, sourceDimension, BufferedImage.TYPE_BYTE_GRAY);    // Draw the original image into rotated, via transformation    Graphics2D g = rotatedImage.createGraphics();    g.drawImage(image, transform, null);    g.dispose();    int halfDimension = Math.max(width, height) / 2;    int newLeft = Math.max(0, oldCenterX - halfDimension);    int newTop = Math.max(0, oldCenterY - halfDimension);    int newRight = Math.min(sourceDimension - 1, oldCenterX + halfDimension);    int newBottom = Math.min(sourceDimension - 1, oldCenterY + halfDimension);    return new BufferedImageLuminanceSource(rotatedImage, newLeft, newTop, newRight - newLeft, newBottom - newTop);  }}

操作类：DecodeTest

[java] view plaincopyprint?

1. import java.awt.image.BufferedImage;  
2. import java.io.File;  
3. import java.util.Hashtable;  
4. import javax.imageio.ImageIO;  
5. import com.google.zxing.Binarizer;  
6. import com.google.zxing.BinaryBitmap;  
7. import com.google.zxing.DecodeHintType;  
8. import com.google.zxing.LuminanceSource;  
9. import com.google.zxing.MultiFormatReader;  
10. import com.google.zxing.Result;  
11. import com.google.zxing.common.HybridBinarizer;  
12. import com.utils.code.BufferedImageLuminanceSource;  
13.   
14. /** 
15.  * 解析二维码  
16.  * @author Administrator 
17.  * 
18.  */  
19. public class DecodeHelper {  
20.       
21.     public static void main(String[] args) throws Exception {  
22.          try {   
23.              MultiFormatReader formatReader = new MultiFormatReader();   
24.              String filePath = "D:\\new-1.gif"; //new.png  
25.              File file = new File(filePath);   
26.                
27.              BufferedImage image = ImageIO.read(file);  
28.                
29.              LuminanceSource source = new BufferedImageLuminanceSource(image);   
30.                
31.              Binarizer  binarizer = new HybridBinarizer(source);   
32.                
33.              BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);   
34.                
35.              Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();      
36.              hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");      
37.                
38.              Result result = formatReader.decode(binaryBitmap,hints);   
39.   
40.              System.out.println("result = "+ result.toString());   
41.              System.out.println("resultFormat = "+ result.getBarcodeFormat());   
42.              System.out.println("resultText = "+ result.getText());   
43.   
44.          } catch (Exception e) {   
45.              e.printStackTrace();   
46.              }   
47.     }  
48. }  

import java.awt.image.BufferedImage;import java.io.File;import java.util.Hashtable;import javax.imageio.ImageIO;import com.google.zxing.Binarizer;import com.google.zxing.BinaryBitmap;import com.google.zxing.DecodeHintType;import com.google.zxing.LuminanceSource;import com.google.zxing.MultiFormatReader;import com.google.zxing.Result;import com.google.zxing.common.HybridBinarizer;import com.utils.code.BufferedImageLuminanceSource;/** * 解析二维码  * @author Administrator * */public class DecodeHelper {public static void main(String[] args) throws Exception { try {          MultiFormatReader formatReader = new MultiFormatReader();          String filePath = "D:\\new-1.gif"; //new.png         File file = new File(filePath);                   BufferedImage image = ImageIO.read(file);                  LuminanceSource source = new BufferedImageLuminanceSource(image);                   Binarizer  binarizer = new HybridBinarizer(source);                   BinaryBitmap binaryBitmap = new BinaryBitmap(binarizer);                   Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>();             hints.put(DecodeHintType.CHARACTER_SET, "UTF-8");                      Result result = formatReader.decode(binaryBitmap,hints);          System.out.println("result = "+ result.toString());          System.out.println("resultFormat = "+ result.getBarcodeFormat());          System.out.println("resultText = "+ result.getText());  } catch (Exception e) {          e.printStackTrace();          } }}