Search code examples
javamacosexceptionwebcamjavacv

java capturing webcam images macbook

I'm currently beginning on a project where I want to capture and manipulate a datastream from my webcam in order to start I wanted to take some pictures from my webcam and show those to the user. However this gave an error. 

public class quicktest  implements Runnable {
        public static void main(String[] args){
            Thread t=new Thread(new quicktest());
            t.start();
        }

        IplImage image;
        CanvasFrame canvas = new CanvasFrame("Web Cam");
        public quicktest() {
            canvas.setDefaultCloseOperation(javax.swing.JFrame.EXIT_ON_CLOSE);
        }
        @Override
        public void run() {
            FrameGrabber grabber = new VideoInputFrameGrabber(0); 

            int i=0;
            try {
                grabber.start();
                IplImage img;
                while (true) {
                    img = grabber.grab();
                    if (img != null) {
                        cvFlip(img, img, 1);// l-r = 90_degrees_steps_anti_clockwise
                        // show image on window
                        canvas.showImage(img);
                    }
                     Thread.sleep(1000);
                }
            } catch (Exception e) {
            }
        }

this gives the following exception:

Exception in thread "Thread-3" java.lang.UnsatisfiedLinkError: no jnivideoInputLib in java.library.path
    at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1764)
    at java.lang.Runtime.loadLibrary0(Runtime.java:823)
    at java.lang.System.loadLibrary(System.java:1044)
    at com.googlecode.javacpp.Loader.loadLibrary(Loader.java:711)
    at com.googlecode.javacpp.Loader.load(Loader.java:586)
    at com.googlecode.javacpp.Loader.load(Loader.java:540)
    at com.googlecode.javacv.cpp.videoInputLib.<clinit>(videoInputLib.java:81)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:249)
    at com.googlecode.javacpp.Loader.load(Loader.java:561)
    at com.googlecode.javacpp.Loader.load(Loader.java:540)
    at com.googlecode.javacv.cpp.videoInputLib$videoInput.<clinit>(videoInputLib.java:193)
    at com.googlecode.javacv.VideoInputFrameGrabber.start(VideoInputFrameGrabber.java:101)
    at com.googlecode.javacv.VideoInputFrameGrabber.start(VideoInputFrameGrabber.java:98)
    at quicktest.run(quicktest.java:27)
    at java.lang.Thread.run(Thread.java:695)

I already searched and tried what was suggested here, however this gave me another error:

at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:249)
at com.googlecode.javacpp.Loader.load(Loader.java:561)
at com.googlecode.javacpp.Loader.load(Loader.java:540)
at com.googlecode.javacv.cpp.videoInputLib$videoInput.<clinit>(videoInputLib.java:193)
at Main.main(Main.java:5)

does anyone know how to fix this? By the way this happens on a macbook pro 10.7.5 and trying to use the build in webcam. And while it definably shouldn't matter there is also an ocules rift attached. Using the OpenCVFrameGrabber gave me a java.lang.UnsatisfiedLinkError: no jniopencv_highgui in java.library.path exception instead.

By the way if anyone knows another easy way to get images from my webcam into java that would be helpful to.

Having done what benny.la said I isntead get a

Exception in thread "Thread-3" java.lang.UnsatisfiedLinkError: no jnivideoInputLib in java.library.path

at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1764)
at java.lang.Runtime.loadLibrary0(Runtime.java:823)
at java.lang.System.loadLibrary(System.java:1044)
at com.googlecode.javacpp.Loader.loadLibrary(Loader.java:711)
at com.googlecode.javacpp.Loader.load(Loader.java:586)
at com.googlecode.javacpp.Loader.load(Loader.java:540)
at com.googlecode.javacv.cpp.videoInputLib.<clinit>(videoInputLib.java:81)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:249)
at com.googlecode.javacpp.Loader.load(Loader.java:561)
at com.googlecode.javacpp.Loader.load(Loader.java:540)
at com.googlecode.javacv.cpp.videoInputLib$videoInput.<clinit>(videoInputLib.java:193)
at com.googlecode.javacv.VideoInputFrameGrabber.start(VideoInputFrameGrabber.java:101)
at com.googlecode.javacv.VideoInputFrameGrabber.start(VideoInputFrameGrabber.java:98)
at quicktest.run(quicktest.java:29)
at java.lang.Thread.run(Thread.java:695)

exception.

Solution

  • By the way if anyone knows another easy way to get images from my webcam into java that would be helpful to.

    Since you're on a macbook, you could do something like:

    Runtime.getRuntime().exec("screencapture tempfile.jpg");
InputStream in = new FileInputStream("tempfile.jpg");