Cv Mat Types C

Abs is a meta function that is expanded to one of absdiff or convertscaleabs forms.

Cv mat types c.

If you are familiar with the c interface pre version 2 1 implementation of the opencv library you will remember the data types iplimage and cvmat you might also recall cvarr in the c implementation these are all gone replaced with cv mat this means no more dubious casting of void pointers in function arguments and in general is a tremendous enhancement in the internal. Cvmat is now obsolete. 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. To access multiple channel matrices you can use cv mat elem matrix type i j nchannels channel idx.

If the format depth or channel order is different use mat convertto and cv cvtcolor to convert it before saving. The class mat represents an n dimensional dense numerical single channel or multi channel array. The first character of the name can be followed by an infinite number of alpha numerical characters including characters like or. The class mat represents an n dimensional dense numerical single channel or multi channel array.

Possible parameter names for matrix cv mat. C mat vec uchar n abs a alpha beta is equivalent to convertscaleabs a c alpha beta the output matrix has the same size and the same type. 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. While mat is sufficient in most cases mat can be more convenient if you use a lot of element access operations and if you know matrix type at the compilation time.

Type has the same meaning as in cvcreatemat. There are many different ways to create cv mat object. The name starts with a lower or upper case character hence a value between a z or a z. Here are the some popular ones.

Consider using mat instead. N dimensional dense array class. C abs a is equivalent to absdiff a scalar all 0 c. Calculates an absolute value of each matrix element.

The parameters which you add to the cv mat must have a name which fits to the following rules. A new matrix of the specified size and specifed type will be allocated. Note that mat at int y int x and mat operator int y int x do absolutely the same and run at the same speed but the latter is certainly shorter. C abs a b is equivalent to absdiff a b c.

Multiple images vector of mat can be saved in tiff format see the code sample below.