Manipulating and accessing Mat data in EmguCV: how to get array elements and apply scalar?

C++
1

I’ve started using EmguCV in C# and there is a bit of an adjustment, as method calls here are not all 1-to-1 as they are in C++.

If I have a histogram image to work with I call “hist”, and I wanted to access its elements to push to another vector, I would simply:
d.push_back(hist.at(i - 1));

There does not seem to be a .at method available in the emgu wrapper. Does anyone have experience with this, and would this be its C# equivalent?:
var histMatData = hist.GetData();
d.Add((float)histMatData.GetValue(i-1, 0)); //crashes when doing (0, i-1)

While I am at it, I want to make a new image with a Scalar specified. But there is no option in any constructor in EmguCV’s Mat object. How could I do this?

I can make two separate topics if that is considered more appropriate. Thanks in advance for any advice.

2

if you want my 2 ct. - dont use emgu

it’s not supported from opencv (3rd party wrapper), their forum is dead, and once you have an API problem, – you’re dead in the water.

3

Thanks! I’m glad the solution is to just not do it. I’ll go tell my boss that.

4

look at “opencvsharp” instead.

but yes, bosses need to be told “no” more often or else they go on believing this “mind over matter” nonsense and walk off the holodeck.

5

Thank you, that is helpful. I will look at it.

It’s kind of my fault, I jumped into what looked like an easier project. When working with a certain package/api you won’t get the best idea of its shortcomings until you hit a wall.