The parameters which you add to the cv mat must have a name which fits to the following rules.
Create cv mat c.
Each implementation calls mat create for a destination matrix.
Cv 8uc1 means 8 bit single channel matrix cv 32fc2 means 2 channel i e.
Do not explicitly create outputarray instances applies here too.
We can create a matrix with more than two dimensions.
It can be used to store real or complex valued vectors and matrices grayscale or color images voxel volumes vector fields point clouds tensors histograms though very high dimensional histograms may be better stored in a sparsemat.
We can use array to initialize the constructor.
Possible parameter names for matrix cv mat.
If it is not empty and has the correct size and type the method does nothing.
This type is very similar to inputarray except that it is used for input output and output function parameters.
To the contrary with c api where an output image had to be created by the developer an empty output mat can be supplied to each function.
Mat l 3 arr cv 8uc 1 scalar all 0.
A new matrix of the specified size and specifed type will be allocated.
If you want to make your function polymorphic i e.
Int arr 3 4 3 2.
Or use the universal filestorage i o functions to save the image to xml or yaml format.
Be aware that this only works for two dimensional matrices.
There are many different ways to create cv mat object.
The first character of the name can be followed by an infinite number of alpha numerical characters including characters like or.
You can do this using the operator of mat.
The sample below shows how to create a bgra image how to set custom compression parameters and save it to a png file.
The name starts with a lower or upper case character hence a value between a z or a z.
Just like with inputarray opencv users should not care about outputarray they just pass mat vector t etc.
The class mat represents an n dimensional dense numerical single channel or multi channel array.
Type has the same meaning as in cvcreatemat function e g.
Using cv mat create nrows ncols type method or the similar constructor cv mat mat nrows ncols type fill value constructor.
However for debugging purposes it s much more convenient to see the actual values.
The same limitation as for inputarray.
N dimensional dense array class.
This method allocates data for a matrix if it is empty.
Here are the some popular ones.
If the format depth or channel order is different use mat convertto and cv cvtcolor to convert it before saving.
