MatExpr operators - how do I translate this?

[replaysMike]

Hello all - I see that the greaterthan/lessthan operators aren't implemented in OpenCvSharp, and a very old issue regarding it.

If they aren't implemented - how does one translate this C++ syntax over to C#?

cv::Mat myMat;
var exp = 255 - ( myMat > 0 );

var myMat = new Mat();
var exp = 255 - myMat; // this works fine, but I don't know what the > 0 is supposed to do!

can anyone help?

[replaysMike]

ok the greater than operator in this case is producing a boolean result where every pixel greater than 0 will have a value of 255 - or so I have come to understand.

Best alternative I came up with is the following, which probably isn't as efficient:

for(var x = 0; x < myMat.Cols; x++)
{
    for (var y = 0; y < myMat.Rows; y++)
    {
        var val = myMat.At<byte>(x, y);
        if (val > 0)
            myMat.At<byte>(x, y) = 255;
        else
            myMat.At<byte>(x, y) = 0;
    }
}
// then invert the result
var exp = 255 - myMat;

The 255 - myMat operator just inverts that result after which works fine in OpenCvSharp.

[AvenSun]

@replaysMike

you can try this , It should be more efficient compared with loops.

var myMat = new Mat();
// there's an operator GreaterThan 
var exp = 255 - myMat.GreaterThan(0)

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