cv::Mat::size() cannot be found here
Hi,
I cannot find the size() in the class reference but I know that it is there. So what am I missing?
Here is a link to the documentation
Thank you
Hi,
I cannot find the size() in the class reference but I know that it is there. So what am I missing?
Here is a link to the documentation
Thank you
I stand to be corrected but according to their documentation, there are two ways of attaining the size of a Matrix.
So let us say we have Mat temp
. If we want to find its size, you could either:
1. Old School method
From their documentation, a Mat consists of a size
attribute which returns a MatSize
struct object. By doing temp.size
, you will get the correct matrix size but in MatSize
return type and of height X width format.
2. Operator method
A look into MatSize, you will see that it implements the ()
operator. With this method though, its return type is Size
and of the famously adapted format width X height. So by doing temp.size()
, the MatSize's operator() method gets called.
You might ask, so which one should be used? It depends on your scenario.
I believe the MatSize
version was there for the old C-API (speculation). If you are still using it (you shouldn't be by now), then .size
makes sense. During my lazy coding days, I tend to use it as well just for quick matrix size checkups.
I mostly use .size()
because other functions adapted Size
. For example, this default constructor takes Size
instead of MSize
.
Either one you choose to use, keep in mind of the returned format.
Asked: 2017-09-11 10:22:41 -0600
Seen: 444 times
Last updated: Sep 11 '17
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I saw that but it returned the
MatSize
object