我是 openimaj 的新手，我找不到任何包含详细信息的教程。我只从 openimaj.org 找到了 tutorial-pdf。所以我试着从轮廓开始。但是 SuzukiContourProcessor 对我不起作用。这是我的代码：
try {
File f = new File("contours_i.bmp");
System.out.println(f.getAbsolutePath());
FImage image = ImageUtilities.readF(f);
BufferedImage bi = ImageUtilities.createBufferedImage(image);
jPanel1.getGraphics().drawImage(bi, 0, 0, null);
Border contours = SuzukiContourProcessor.findContours(image);
final MBFImage imgC = new MBFImage(640, 480, ColourSpace.RGB);
ContourRenderer.drawContours(imgC, contours);
DisplayUtilities.display(imgC);
} catch (IOException ex) {
Logger.getLogger(ContoursTest.class.getName()).log(Level.SEVERE, null, ex);
}
这是使用的图像：无法识别较低的“洞”：http: //i.stack.imgur.com/4NUGQ.png
在 SuzukiContourProcessor 中出现 NullPointerException 崩溃：http: //i.stack.imgur.com/IEM15.png
这是使用第二个图像的堆栈跟踪：
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at org.openimaj.image.contour.SuzukiContourProcessor.findContours(SuzukiContourProcessor.java:223)
at org.openimaj.image.contour.SuzukiContourProcessor.findContours(SuzukiContourProcessor.java:185)
at sudoku.ContoursTest.jButton1ActionPerformed(ContoursTest.java:86)
at sudoku.ContoursTest.access$000(ContoursTest.java:18)
at sudoku.ContoursTest$1.actionPerformed(ContoursTest.java:47)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3320)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:694)
at java.awt.EventQueue$3.run(EventQueue.java:692)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:708)
at java.awt.EventQueue$4.run(EventQueue.java:706)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
问题似乎是
borderMap.get(lnbd[0])
返回 null 并且
switch (borderPrime.type) {...
抛出 NullPointerException。也许我做错了什么。
感谢您的帮助。
克里斯。