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converting bitmap to Mat ( java, android)

asked 2013-03-05 06:58:39 -0500

zippy gravatar image

updated 2013-03-06 00:11:46 -0500

Hi, i face problem in converting bitmap to Mat ( thru highgui)

i got the image by using built-in android camera API. What i need to do is capture image from camera, change that bitmap to Mat, then apply rgb2gray. Can i know what is the correct and recommended way to perform the async initialization if i were to use the highgui only?

edit ( error message):

------------------------------------------------
03-05 21:47:44.918: E/AndroidRuntime(29461): FATAL EXCEPTION: main
03-05 21:47:44.918: E/AndroidRuntime(29461): java.lang.UnsatisfiedLinkError: Native method not found: org.opencv.highgui.Highgui.imread_1:(Ljava/lang/String;)J
03-05 21:47:44.918: E/AndroidRuntime(29461):    at org.opencv.highgui.Highgui.imread_1(Native Method)
03-05 21:47:44.918: E/AndroidRuntime(29461):    at org.opencv.highgui.Highgui.imread(Highgui.java:349)
03-05 21:47:44.918: E/AndroidRuntime(29461):    at com.example.finalcameraapi.Main.onActivityResult(Main.java:110)
03-05 21:47:44.918: E/AndroidRuntime(29461):    at android.app.Activity.dispatchActivityResult(Activity.java:5293)
03-05 21:47:44.918: E/AndroidRuntime(29461):    at android.app.ActivityThread.deliverResults(ActivityThread.java:3315)
03-05 21:47:44.918: E/AndroidRuntime(29461):    at android.app.ActivityThread.handleSendResult(ActivityThread.java:3362)
03-05 21:47:44.918: E/AndroidRuntime(29461):    at android.app.ActivityThread.access$1100(ActivityThread.java:141)
03-05 21:47:44.918: E/AndroidRuntime(29461):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1282)
03-05 21:47:44.918: E/AndroidRuntime(29461):    at android.os.Handler.dispatchMessage(Handler.java:99)
03-05 21:47:44.918: E/AndroidRuntime(29461):    at android.os.Looper.loop(Looper.java:137)
03-05 21:47:44.918: E/AndroidRuntime(29461):    at android.app.ActivityThread.main(ActivityThread.java:5041)
03-05 21:47:44.918: E/AndroidRuntime(29461):    at java.lang.reflect.Method.invokeNative(Native Method)
03-05 21:47:44.918: E/AndroidRuntime(29461):    at java.lang.reflect.Method.invoke(Method.java:511)
03-05 21:47:44.918: E/AndroidRuntime(29461):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-05 21:47:44.918: E/AndroidRuntime(29461):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-05 21:47:44.918: E/AndroidRuntime(29461):    at dalvik.system.NativeStart.main(Native Method)
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answered 2013-03-06 00:19:25 -0500

java.lang.UnsatisfiedLinkError: Native method not found exception for methods from OpenCV means that you try to use OpenCV before its initialization. You may use OpenCV objects and call methods from library only after onManagerConnected with status LoaderCallbackInterface.SUCCESS.

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thanks for your response. Is is that i need to initialize cameraview, then only i can use highgui?

zippy gravatar imagezippy ( 2013-03-06 05:35:52 -0500 )edit
1

Do you call initAsync method to initialize OpenCV? If that, all OpenCV code will be work, when callback with successful status will return.

If you use initDebug method, then OpenCV will be ready after its call. In this case OpenCV native libs must be placed in your application package. Add "OPENCV_CAMERA_MODULES := on" and "OPENCV_INSTALL_MODULES := on" strings to Android.mk before inclusion of OpenCV.mk to do it automatically.

Alexander Smorkalov gravatar imageAlexander Smorkalov ( 2013-03-06 06:49:44 -0500 )edit
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Asked: 2013-03-05 06:58:39 -0500

Seen: 2,090 times

Last updated: Mar 06 '13