i have been using processing before to read out QR-codes. there is a wonderful sample by Daniel Shiffman that i have used as a base ( http://www.shiffman.net/p5/pqrcode/). he uses the zxing "zebra crossing" library ( http://code.google.com/p/zxing/). now, i want to build a QR-Code table with an active area of 100cm by 35cm.

to do this i set up four playstation3 cameras in line to cover a specified field of view. in processing, i m setting up the cameras as well, but apparently the zxing library can only detect QR-codes in one camera capture. thats why i m running the decode thread on each camera image -- i guess there is better ways to do this.

i m assuming, that the best way to work around this problem, is to stitch the four camera images together, and have the zxing decode this. 

so, how do i stitch the camera images together?

other suggestions are greatly appreciated.

the code is attached.

please help

best regards universally :)

T

1.  
2. import processing.video.*;
3. import com.google.zxing.*;
4. import java.awt.image.BufferedImage;
5. 
   
6. Capture cam1; //Set up the camera
7. Capture cam2; //Set up the camera
8. Capture cam3; //Set up the camera
9. Capture cam4; //Set up the camera
10. com.google.zxing.Reader reader = new com.google.zxing.qrcode.QRCodeReader();
11. 
    
12. String[] captureDevices; 
13. 
    
14. void setup() {
15.   size(1280, 240); // wich is 4x320
16.   println (Capture.list());
17. 
    
18.   cam1 = new Capture(this, 320, 240, 30);
19.   cam2 = new Capture(this, 320, 240, 30);
20.   cam3 = new Capture(this, 320, 240, 30);
21.   cam4 = new Capture(this, 320, 240, 30);
22. }
23. 
    
24. 
    
25. void draw() {
26. 
    
27.   // CAM 1
28.   if (cam1.available() == true) {
29.     cam1.read();    
30.     image(cam1, 0, 0);
31. 
    
32.     try {
33.       // Now test to see if it has a QR code embedded in it
34.       LuminanceSource source = new BufferedImageLuminanceSource((BufferedImage)cam1.getImage());
35.       BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));       
36.       Result result = reader.decode(bitmap); 
37.       //Once we get the results, we can do some display
38.       if (result.getText() != null) { 
39.         println(result.getText());
40.         ResultPoint[] points = result.getResultPoints();
41.         //Draw some ellipses on at the control points
42.         for (int i = 0; i < points.length; i++) {
43.           fill(#ff8c00);
44.           ellipse(points[i].getX(), points[i].getY(), 20, 20);
45.         }
46.       }
47.     }
48.     catch (Exception e) {
49.       //         println(e.toString());
50.     }
51.   }
52. 
    
53.   // CAM 2
54.   if (cam2.available() == true) {
55.     cam2.read();    
56.     image(cam2, 320, 0);
57. 
    
58.     try {
59.       // Now test to see if it has a QR code embedded in it
60.       LuminanceSource source = new BufferedImageLuminanceSource((BufferedImage)cam2.getImage());
61.       BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));       
62.       Result result = reader.decode(bitmap); 
63.       //Once we get the results, we can do some display
64.       if (result.getText() != null) { 
65.         println(result.getText());
66.         ResultPoint[] points = result.getResultPoints();
67.         //Draw some ellipses on at the control points
68.         for (int i = 0; i < points.length; i++) {
69.           fill(#ff8c00);
70.           ellipse(points[i].getX(), points[i].getY(), 20, 20);
71.         }
72.       }
73.     }
74.     catch (Exception e) {
75.       //         println(e.toString());
76.     }
77.   }
78. 
    
79.   // CAM 3
80.   if (cam3.available() == true) {
81.     cam3.read();    
82.     image(cam3, 640, 0);
83. 
    
84.     try {
85.       // Now test to see if it has a QR code embedded in it
86.       LuminanceSource source = new BufferedImageLuminanceSource((BufferedImage)cam3.getImage());
87.       BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));       
88.       Result result = reader.decode(bitmap); 
89.       //Once we get the results, we can do some display
90.       if (result.getText() != null) { 
91.         println(result.getText());
92.         ResultPoint[] points = result.getResultPoints();
93.         //Draw some ellipses on at the control points
94.         for (int i = 0; i < points.length; i++) {
95.           fill(#ff8c00);
96.           ellipse(points[i].getX(), points[i].getY(), 20, 20);
97.         }
98.       }
99.     }
100.     catch (Exception e) {
101.       //         println(e.toString());
102.     }
103.   }
104. 
     
105.   // CAM 4
106.   if (cam4.available() == true) {
107.     cam4.read();    
108.     image(cam4, 960, 0);
109. 
     
110.     try {
111.       // Now test to see if it has a QR code embedded in it
112.       LuminanceSource source = new BufferedImageLuminanceSource((BufferedImage)cam4.getImage());
113.       BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));       
114.       Result result = reader.decode(bitmap); 
115.       //Once we get the results, we can do some display
116.       if (result.getText() != null) { 
117.         println(result.getText());
118.         ResultPoint[] points = result.getResultPoints();
119.         //Draw some ellipses on at the control points
120.         for (int i = 0; i < points.length; i++) {
121.           fill(#ff8c00);
122.           ellipse(points[i].getX(), points[i].getY(), 20, 20);
123.         }
124.       }
125.     }
126.     catch (Exception e) {
127.       //         println(e.toString());
128.     }
129.   }
130. }
131.