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Editorial Team
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Asked: 2026-06-15T15:25:36+00:00

I’m getting the following errors using some generic functions within OpenCV for Android 12-05

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I’m getting the following errors using some generic functions within OpenCV for Android

12-05 21:08:55.486: E/cv::error()(6658): 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 /home/oleg/sources/opencv/modules/java/generator/src/cpp/utils.cpp, line 107
12-05 21:08:55.486: E/org.opencv.android.Utils(6658): nMatToBitmap catched cv::Exception: /home/oleg/sources/opencv/modules/java/generator/src/cpp/utils.cpp:107: 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)
12-05 21:08:55.486: E/CameraBridge(6658): Mat type: Mat [ 144*192*CV_8UC3, isCont=true, isSubmat=false, nativeObj=0x1024c0, dataAddr=0x44783010 ]
12-05 21:08:55.486: E/CameraBridge(6658): Bitmap type: 384*288
12-05 21:08:55.486: E/CameraBridge(6658): Utils.matToBitmap() throws an exception: /home/oleg/sources/opencv/modules/java/generator/src/cpp/utils.cpp:107: 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)

I’m not sure if this is the error itself or if it’s caused by another problem.

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1 Answer

  1. Editorial Team

    The assertion error is telling you that one or more of the following tests is failing:

    src.dims == 2
info.height == (uint32_t)src.rows
info.width == (uint32_t)src.cols

    I’m guessing info contains the dimensions of the destination bitmap. In that case, either your source Mat is not 2 dimensions or the dimensions of the destination bitmap don’t match the dimensions of the source Mat.

    These two lines

    12-05 21:08:55.486: E/CameraBridge(6658): Mat type: Mat [ 144*192*CV_8UC3, isCont=true, isSubmat=false, nativeObj=0x1024c0, dataAddr=0x44783010 ]
12-05 21:08:55.486: E/CameraBridge(6658): Bitmap type: 384*288

    suggest that your Mat is 144×192 and your bitmap is 384×288. It looks like one is portrait and the other landscape plus your bitmap is twice the resolution of your Mat.

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