Create Cv Mat C

Creating a mat object explicitly.

Create cv mat c. N dimensional dense array class. We can use array to initialize the constructor. 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. The name starts with a lower or upper case character hence a value between a z or a z.

Mat l 3 arr cv 8uc 1 scalar all 0. This method allocates data for a matrix if it is empty. The first character of the name can be followed by an infinite number of alpha numerical characters including characters like or. Type has the same meaning as in cvcreatemat function e g.

The sample below shows how to create a bgra image how to set custom compression parameters and save it to a png file. Here are the some popular ones. In the load modify and save an image tutorial you have already learned how to write a matrix to an image file by using the cv imwrite function. Or use the universal filestorage i o functions to save the image to xml or yaml format.

Each implementation calls mat create for a destination matrix. This type is very similar to inputarray except that it is used for input output and output function parameters. Int arr 3 4 3 2. Cv 8uc1 means 8 bit single channel matrix cv 32fc2 means 2 channel i e.

Possible parameter names for matrix cv mat. If it is not empty and has the correct size and type the method does nothing. A new matrix of the specified size and specifed type will be allocated. Complex floating point matrix etc.

Just like with inputarray opencv users should not care about outputarray they just pass mat vector t etc. You can do this using the operator of mat. We can create a matrix with more than two dimensions. 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.

The same limitation as for inputarray. Be aware that this only works for two dimensional matrices. If you want to make your function polymorphic i e. If the format depth or channel order is different use mat convertto and cv cvtcolor to convert it before saving.

However for debugging purposes it s much more convenient to see the actual values. The parameters which you add to the cv mat must have a name which fits to the following rules. The class mat represents an n dimensional dense numerical single channel or multi channel array.