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How to return and show only cropped area on CameraView?

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I cand cropped CameraFrame. When I return the cropped area then I'm getting error. public Mat onCameraFrame(CameraBridgeViewBase.CvCameraViewFrame inputFrame) { Mat imgSrc = inputFrame.rgba; Point fPoint = new Point(0, imgSrc.rows()/6); Point lPoint = new Point(imgSrc.cols(), imgSrc.rows()*5/6); Rect rect = new Rect(fPoint, lPoint); Imgproc.rectangle(imgSrc, fPoint, lPoint, new Scalar(0, 255, 0)); Mat croppedImage = new Mat(imgSrc, rect); return croppedImage; } And getting this error: E/cv::error(): OpenCV Error: Assertion failed (src.dims == 2 && info.height == (uint32_t)src.rows && info.width == (uint32_t)src.cols) in void Java_org_opencv_android_Utils_nMatToBitmap2(JNIEnv*, jclass, jlong, jobject, jboolean), file /Volumes/Linux/builds/master_pack-android/opencv/modules/java/generator/src/cpp/utils.cpp, line 97 E/org.opencv.android.Utils: nMatToBitmap catched cv::Exception: /Volumes/Linux/builds/master_pack-android/opencv/modules/java/generator/src/cpp/utils.cpp:97: error: (-215) src.dims == 2 && info.height == (uint32_t)src.rows && info.width == (uint32_t)src.cols in function void Java_org_opencv_android_Utils_nMatToBitmap2(JNIEnv*, jclass, jlong, jobject, jboolean) E/CameraBridge: Mat type: Mat [ 320*864*CV_8UC4, isCont=true, isSubmat=true, nativeObj=0x5f773ff8, dataAddr=0x60cb4810 ] E/CameraBridge: Bitmap type: 864*480 E/CameraBridge: Utils.matToBitmap() throws an exception: /Volumes/Linux/builds/master_pack-android/opencv/modules/java/generator/src/cpp/utils.cpp:97: error: (-215) src.dims == 2 && info.height == (uint32_t)src.rows && info.width == (uint32_t)src.cols in function void Java_org_opencv_android_Utils_nMatToBitmap2(JNIEnv*, jclass, jlong, jobject, jboolean)

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