Stop process of webcam in java netbeans -

i want capture image using available webcam. have accessed webcam couldn't stop webcam process. want stop webcam process using stop button. how can accomplish this? code:

public component componen() throws ioexception , noplayerexception, cannotrealizeexception         {              component comp_video;             medialocator loo = new medialocator("vfw://0");             try {                 broadcast = manager.createrealizedplayer(loo);             } catch (ioexception ex) {                 logger.getlogger(capturimage.class.getname()).log(level.severe, null, ex);             } catch (noplayerexception ex) {                 logger.getlogger(capturimage.class.getname()).log(level.severe, null, ex);             } catch (cannotrealizeexception ex) {                 logger.getlogger(capturimage.class.getname()).log(level.severe, null, ex);             }             broadcast.start();              if((comp_video = broadcast.getvisualcomponent()) != null)             {                 comp_video.setsize(321,228);                 return comp_video;              }             else             {                      return null;             }      }  public void capture_image() {     framegrabbingcontrol grab = (framegrabbingcontrol)    broadcast.getcontrol("javax.media.control.framegrabbingcontrol");      javax.media.buffer buff = grab.grabframe();       buffertoimage buffer =new buffertoimage((videoformat) buff.getformat());      img = buffer.createimage(buff);      }  public void set_iamge_label(final jlabel lb) {     thread web = new thread(){      public void run(){       capture_image();     rectangle rect = lb.getbounds();     image img1 = img.getscaledinstance(rect.width,rect.height,image.scale_default);     lb.seticon(new javax.swing.imageicon(img1));       }     };      web.start(); }