Operators for cv::UMat

edit

Yes but I have got strange result with Mat or UMat :

    Mat x(1, 2, CV_8UC1, Scalar::all(3)),y;
    cout<<x<<"\n";
    add(x, 2.0, x);
    cout << x << "\n";
    multiply(x, 2.1, y, 1, CV_32F);
    cout << y << "\n";
    multiply(x, 2.1, x, 1, CV_32F);
    cout << x << "\n";

[  3,   3]
[  5,   5]     -> 3+2=5 Yes
[10.5, 10.5] -> 5*2.1 = 10.5 Yes
[430.5, 430.5] -> 5* 2.1 = ?

with UMat it is

[  3,   3]
[  5,   5] Yes
[10.5, 10.5]  Yes
[3.7807033e-42, 0] ?

I should be tired

Maybe multiply cannot work with inplace input / output variable?

multiply(x, 2.1, **x**, 1, CV_32F);

I 'm agree but it should be in doc. But multiply(x, 2.1, x); is good so...and multiply(x, x, x); too but not multiply(x, x, x,1,CV_32FC1); Problem is with type conversion?

Maybe when dst is created with the wanted ouput type, it (x) is only garbage as there should be no recopy if inplace operation was not expected? Corresponding source code is here.

new issue

Thanks for your input. I get correct results using the following: x = x.mul( 2.1 );, I don't know however if this adds overhead. Is there extra copying taking place due to the assignement operator?