java.lang.IllegalArgumentException: Output List can't be null

Stack Overflow | ng2b30 | 6 days ago
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  1. 0

    findContours and drawContours using opencv in android

    Stack Overflow | 6 days ago | ng2b30
    java.lang.IllegalArgumentException: Output List can't be null
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    BRISK and RANSAC to detect object

    Stack Overflow | 1 year ago | Mameli Marco
    org.opencv.core.CvException: cv::Exception: /builds/master_pack-android/opencv/modules/imgproc/src/imgwarp.cpp:4740: error: (-215) ifunc != 0 in function void cv::remap(cv::InputArray, cv::OutputArray, cv::InputArray, cv::InputArray, int, int, const Scalar&) ]
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    java.lang.NullPointerException: Attempt to read from field 'long org.opencv.core.Mat.nativeObj' on a null object reference

    Stack Overflow | 8 months ago | Pragyan93
    java.lang.NullPointerException: Attempt to read from field 'long org.opencv.core.Mat.nativeObj' on a null object reference

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    Root Cause Analysis

    1. java.lang.IllegalArgumentException

      Output List can't be null

      at org.opencv.utils.Converters.Mat_to_vector_vector_Point()
    2. org.opencv.utils
      Converters.Mat_to_vector_vector_Point
      1. org.opencv.utils.Converters.Mat_to_vector_vector_Point(Converters.java:494)
      1 frame
    3. org.opencv.imgproc
      Imgproc.findContours
      1. org.opencv.imgproc.Imgproc.findContours(Imgproc.java:2112)
      1 frame
    4. fyp.hkust.facet
      ColorizeFaceActivity$5.onClick
      1. fyp.hkust.facet.activity.ColorizeFaceActivity.detectRegion(ColorizeFaceActivity.java:325)
      2. fyp.hkust.facet.activity.ColorizeFaceActivity.access$1600(ColorizeFaceActivity.java:74)
      3. fyp.hkust.facet.activity.ColorizeFaceActivity$5.onClick(ColorizeFaceActivity.java:304)
      3 frames
    5. Android Platform
      ActivityThread.main
      1. android.view.View.performClick(View.java:5280)
      2. android.view.View$PerformClick.run(View.java:21239)
      3. android.os.Handler.handleCallback(Handler.java:739)
      4. android.os.Handler.dispatchMessage(Handler.java:95)
      5. android.os.Looper.loop(Looper.java:234)
      6. android.app.ActivityThread.main(ActivityThread.java:5526)
      6 frames
    6. Java RT
      Method.invoke
      1. java.lang.reflect.Method.invoke(Native Method)
      1 frame
    7. Android
      ZygoteInit.main
      1. com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
      2. com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
      2 frames