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I'd like to know how to convert UMat image onto Mat and back-and-forth. I do calculation on input image which I read/write

UMat img,gray; 
imread("lena.jpg", 1).copyTo(img); 
cvtColor(img, gray, COLOR_BGR2GRAY);  
imwrite("lena_gray.jpg", gray);

I have OpenCV 3.4.1. and after imwrite() call I got

Segmentation fault (core dumped)

There is a bug #11176 of segmentation fault if UMat saves by imwrite()

So I'm thinking to convert to Mat and after then to save.

How to convert UMat to Mat back-and-forth?

I'd like to know how to convert UMat image onto Mat and back-and-forth. I do calculation on input image which I read/write

UMat img,gray; 
imread("lena.jpg", 1).copyTo(img); 
cvtColor(img, gray, COLOR_BGR2GRAY);  
imwrite("lena_gray.jpg", gray);

I have OpenCV 3.4.1. and after imwrite() call I got

Segmentation fault (core dumped)

There is a bug #11176 of segmentation fault if UMat saves saved by imwrite() call

So I'm thinking to convert to Mat and after then to save.

How to convert UMat to Mat back-and-forth?

I'd like to know how to convert UMat image onto Mat and back-and-forth. I do calculation on input image which I read/write

UMat img,gray; 
imread("lena.jpg", 1).copyTo(img); 
cvtColor(img, gray, COLOR_BGR2GRAY);  
imwrite("lena_gray.jpg", gray);

I have OpenCV 3.4.1. and after imwrite() call I got

Segmentation fault (core dumped)

There is a bug #11176 of segmentation fault if UMat saved by imwrite() call

So I'm thinking to convert to Mat and after then to save.

How to convert UMat to Mat back-and-forth?

I'd like to know how to convert UMat image onto Mat and back-and-forth. I do calculation on input image which I read/write

UMat img,gray; 
imread("lena.jpg", 1).copyTo(img); 
cvtColor(img, gray, COLOR_BGR2GRAY);  
imwrite("lena_gray.jpg", gray);

I have OpenCV 3.4.1. and after imwrite() call I got

Segmentation fault (core dumped)

There is a bug #11176 of segmentation fault if UMat saved by imwrite() call

call So I'm thinking to convert to Mat and after then to save.

save. How to convert UMat to Mat back-and-forth?

back-and-forth? Or is there any other solution to write UMat image instead?