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Asked: 2026-05-31T07:22:04+00:00

I am using Java openCV, and i try to load a photo and run

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I am using Java openCV, and i try to load a photo and run the template matching over it.
The template matching method deals with Mat objects, so i need to load the images and convert them into Mat.

The way i do it is:

Bitmap i = BitmapFactory.decodeFile("/sdcard/TVguide/Detection/detected.jpg");
image = Utils.bitmapToMat(i);

This way i load a photo from my android SD card, and try to convert it into Mat object using the openCV method bitmapToMat.
The problem is that on the conversion, the application crashes.

Here is the LogCat:

            03-14 15:15:57.636: W/dalvikvm(1059): Exception Ljava/lang/UnsatisfiedLinkError; thrown while initializing Lorg/opencv/android/Utils;
            03-14 15:15:57.636: D/AndroidRuntime(1059): Shutting down VM
            03-14 15:15:57.636: W/dalvikvm(1059): threadid=1: thread exiting with uncaught exception (group=0x40015578)
            03-14 15:15:57.640: E/AndroidRuntime(1059): FATAL EXCEPTION: main
            03-14 15:15:57.640: E/AndroidRuntime(1059): java.lang.ExceptionInInitializerError
            03-14 15:15:57.640: E/AndroidRuntime(1059):     at com.marakana.Preview$3.onPictureTaken(Preview.java:191)
            03-14 15:15:57.640: E/AndroidRuntime(1059):     at android.hardware.Camera$EventHandler.handleMessage(Camera.java:565)
            03-14 15:15:57.640: E/AndroidRuntime(1059):     at android.os.Handler.dispatchMessage(Handler.java:99)
            03-14 15:15:57.640: E/AndroidRuntime(1059):     at android.os.Looper.loop(Looper.java:123)
            03-14 15:15:57.640: E/AndroidRuntime(1059):     at android.app.ActivityThread.main(ActivityThread.java:3687)
            03-14 15:15:57.640: E/AndroidRuntime(1059):     at java.lang.reflect.Method.invokeNative(Native Method)
            03-14 15:15:57.640: E/AndroidRuntime(1059):     at java.lang.reflect.Method.invoke(Method.java:507)
            03-14 15:15:57.640: E/AndroidRuntime(1059):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:842)
            03-14 15:15:57.640: E/AndroidRuntime(1059):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:600)
            03-14 15:15:57.640: E/AndroidRuntime(1059):     at dalvik.system.NativeStart.main(Native Method)
            03-14 15:15:57.640: E/AndroidRuntime(1059): Caused by: java.lang.UnsatisfiedLinkError: Couldn't load opencv_java: findLibrary returned null
            03-14 15:15:57.640: E/AndroidRuntime(1059):     at java.lang.Runtime.loadLibrary(Runtime.java:429)
            03-14 15:15:57.640: E/AndroidRuntime(1059):     at java.lang.System.loadLibrary(System.java:554)
            03-14 15:15:57.640: E/AndroidRuntime(1059):     at org.opencv.android.Utils.<clinit>(Utils.java:86)
            03-14 15:15:57.640: E/AndroidRuntime(1059):     ... 10 more
            03-14 15:16:03.472: I/Process(1059): Sending signal. PID: 1059 SIG: 9

I can’t understand if i am doing something wrong or it is just a buggy openCV.

Thanks
Eyal

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1 Answer

  1. Editorial Team

    You need to convert your bitmap to the RGBA format:

    Bitmap bmp32 = i.copy(Bitmap.Config.ARGB_8888, true);

    Actually it is the most discussed problem on Android-OpenCV user-group: https://groups.google.com/group/android-opencv/

    The fix for this problem is already available in OpenCV trunk and will be included into the next release of OpenCV.

    Also you can read image using the OpenCV API:

    Mat image = Highgui.imread("/sdcard/TVguide/Detection/detected.jpg");
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