Java + OpenCv Max external

    Feb 18 2014 | 10:19 pm
    Hi I need help to use opencv inside an mxj object...
    I compiled the new Opencv 2.4.8
    moved the .jar file into the jar directory of max
    and moved the .dylib in usr/lib/java
    my code is this:
    import com.cycling74.max.*;
    import org.opencv.core.Core;
    import org.opencv.core.CvType;
    import org.opencv.core.Mat;
    import org.opencv.core.Scalar;
    public class MaxTest extends MaxObject {
    static{ System.loadLibrary(Core.NATIVE_LIBRARY_NAME); }
    private static final String[] INLET_ASSIST = new String[]{
    "inlet 1 help"
    private static final String[] OUTLET_ASSIST = new String[]{
    "outlet 1 help"
    public MaxTest(Atom[] args)
    declareInlets(new int[]{DataTypes.ALL});
    declareOutlets(new int[]{DataTypes.ALL});
    post("La versione di OpenCV caricata è la: " + Core.VERSION);
    post("La versione della Java Virtual Machine è: " + System.getProperty("java.version"));
    post("Il library path è: " + System.getProperty("java.library.path"));
    public void bang() {
    outlet(0, "OK!");
    Mat m = new Mat(5, 10, CvType.CV_8UC1, new Scalar(0));
    post("OpenCV Mat: " + m);
    Mat mr1 = m.row(1);
    mr1.setTo(new Scalar(1));
    Mat mc5 = m.col(5);
    mc5.setTo(new Scalar(5));
    post("OpenCV Mat data:\\n" + m.dump());
    I get this in the max window:
    /Applications/Max 6.1/Cycling '74/java/lib/ffmpeg-1.2-macosx-x86_64.jar
    /Applications/Max 6.1/Cycling '74/java/lib/jitter.jar
    /Applications/Max 6.1/Cycling '74/java/lib/jode-1.1.2-pre-embedded.jar
    /Applications/Max 6.1/Cycling '74/java/lib/jython-standalone-2.5.2.jar
    /Applications/Max 6.1/Cycling '74/java/lib/log4j-1.2.16.jar
    /Applications/Max 6.1/Cycling '74/java/lib/max.jar
    /Applications/Max 6.1/Cycling '74/java/lib/net.loadbang.jython-1.2.1.jar
    /Applications/Max 6.1/Cycling '74/java/lib/net.loadbang.lib-1.8.0.jar
    /Applications/Max 6.1/Cycling '74/java/lib/net.loadbang.scripting-1.1.0.jar
    /Applications/Max 6.1/Cycling '74/java/lib/opencv-248.jar
    MXJClassloader CLASSPATH:
    /Applications/Max 6.1/Cycling '74/java/classes/
    /Volumes/SSD/Applications/Max 6.1/packages/TapTools/java-classes
    Jitter initialized
    Jitter Java support installed
    La versione di OpenCV caricata è la:
    La versione della Java Virtual Machine è: 1.6.0_65
    Il library path è: .:/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java
    print: OK!
    java.lang.UnsatisfiedLinkError: org.opencv.core.Mat.n_Mat(IIIDDDD)J
    at org.opencv.core.Mat.n_Mat(Native Method)
    at org.opencv.core.Mat.(
    at MaxTest.bang(
    I tried and gogooled for very long time, can anyone help me?

    • Feb 27 2014 | 5:04 pm
      I'm guessing a version mismatch between your code and the actual loaded version of OpenCV. The UnsatisfiedLinkError might be a change in the arguments to n_Mat (you're calling with 3 x int and 4 * double).
    • Mar 31 2014 | 5:09 pm
      Thanks Nick, I tested the same code in an Eclipse project and it works,
      I get errors only inside max...
    • Mar 11 2015 | 2:54 pm
      Any news on this?
    • Nov 08 2015 | 6:15 pm
      I've got the same error with OpenCV 3.0.0, Max7, Win 7 32bit :( anyone?