JAVACV : Webcam capturing using javacv - opencv

Question

Tried to capture from a webcam using the JAVACV library. But it throws an UnsatisfiedLinkError.
Stack trace is as follows:
Exception in thread "main" java.lang.UnsatisfiedLinkError:
C:\Users\anooj\AppData\Local\Temp\javacpp7955905460040\jniopencv_core.dll: %1 is not a valid Win32 application
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1928)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1825)
at java.lang.Runtime.load0(Runtime.java:792)
at java.lang.System.load(System.java:1059)
at com.googlecode.javacpp.Loader.loadLibrary(Loader.java:418)
at com.googlecode.javacpp.Loader.load(Loader.java:368)
at com.googlecode.javacpp.Loader.load(Loader.java:315)
at com.googlecode.javacv.cpp.opencv_core.<clinit>(opencv_core.java:131)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at com.googlecode.javacpp.Loader.load(Loader.java:334)
at com.googlecode.javacv.cpp.opencv_imgproc.<clinit>(opencv_imgproc.java:96)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at com.googlecode.javacpp.Loader.load(Loader.java:334)
at com.googlecode.javacv.cpp.opencv_highgui.<clinit>(opencv_highgui.java:91)
at com.googlecode.javacv.OpenCVFrameGrabber.start(OpenCVFrameGrabber.java:170)
at javaapplication16.JavaApplication16.captureframe(JavaApplication16.java:24)
at javaapplication16.JavaApplication16.main(JavaApplication16.java:38)
Java Result: 1
Our code is below:
import com.googlecode.javacv.OpenCVFrameGrabber;
import com.googlecode.javacv.cpp.opencv_core.IplImage;
import static com.googlecode.javacv.cpp.opencv_highgui.cvSaveImage;
public class JavaApplication16 {
/**
* #param args the command line arguments
*/
public static void captureframe()
{
OpenCVFrameGrabber grabber=new OpenCVFrameGrabber(0);
try
{
grabber.start();
IplImage img=grabber.grab();
if(img!=null)
{
cvSaveImage("capture.jpg", img);
}
}
catch(Exception ae)
{
ae.printStackTrace();
}
}
public static void main(String[] args) {
captureframe();
}
}

Answer 1

Make Sure you have installed Microsoft Visual C++ Redistributable
package and setup path variable correctly. Below link explains all
the necessary steps
http://opencvlover.blogspot.in/2012/04/javacv-setup-with-eclipse-on-windows-7.html
Use VideoInputFrameGrabber instead of OpncvFrameGrabber as suggested
in link below
http://code.google.com/p/javacv/wiki/Windows7AndOpenCV#I_cannot_capture_from_my_Webcam_using_opencv_highgui_or_OpenCVFr

Answer 2

Remember that the version of openCV and javaCV must match.
Download latest version openCV 2..46 http://opencv.org/downloads.html
and download the javacp https://code.google.com/p/javacv/downloads/list [Note: choose the javacv-0.6-cppjars.zip 85.0 MB]
In this case you will not get Exception in thread "main" java.lang.UnsatisfiedLinkError:
My Code is running successfully.

Answer 3

see this link to solve the error you got Link1
see this link for the program to capture the image from camera, save it in a JPG format and show it on a canvas Link2
hope it solves your query.