convert Mat to Bitmap Opencv for Android

android, opencv

Solution

1) OpenCV Mat constructor expects `<rows, cols>` pair instead of `<width, height>` as its arguments. So you have to change your second line to

Mat tmp = new Mat (height, width, CvType.CV_8U, new Scalar(4));

2) `Imgproc.cvtColor` can change the dimensions of the `tmp` object. So it is safe to create a bitmap after the color conversion:

Bitmap bmp = null;
Mat tmp = new Mat (height, width, CvType.CV_8U, new Scalar(4));
try {
    //Imgproc.cvtColor(seedsImage, tmp, Imgproc.COLOR_RGB2BGRA);
    Imgproc.cvtColor(seedsImage, tmp, Imgproc.COLOR_GRAY2RGBA, 4);
    bmp = Bitmap.createBitmap(tmp.cols(), tmp.rows(), Bitmap.Config.ARGB_8888);
    Utils.matToBitmap(tmp, bmp);
}
catch (CvException e){Log.d("Exception",e.getMessage());}

Problem

I'm trying to covert a MAt to a Bitmap use following code : ``` Bitmap bmp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); Mat tmp = new Mat (width,height,CvType.CV_8UC1,new Scalar(4)); try { //Imgproc.cvtColor(seedsImage, tmp, Imgproc.COLOR_RGB2BGRA); Imgproc.cvtColor(seedsImage, tmp, Imgproc.COLOR_GRAY2RGBA, 4); Utils.matToBitmap(tmp, bmp);} catch (CvException e){Log.d("Exception",e.getMessage());} ``` my seedsImage is a Mat object. And the Exception and got is `10-09 22:15:09.418: D/Exception(2461): ..\..\modules\java\generator\src\cpp\utils.cpp:105: 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 tried to search through but no solution worked for me. Can anynone help?

Original source

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