Cv Mat Types C

To access multiple channel matrices you can use cv mat elem matrix type i j nchannels channel idx.

Cv mat types c.

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. Abs is a meta function that is expanded to one of absdiff or convertscaleabs forms. The class mat represents an n dimensional dense numerical single channel or multi channel array. Cvmat is now obsolete.

N dimensional dense array class. A new matrix of the specified size and specifed type will be allocated. 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. N dimensional dense array class.

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. Using cv mat create nrows ncols type method or the similar constructor cv mat mat nrows ncols type fill value constructor. If the format depth or channel order is different use mat convertto and cv cvtcolor to convert it before saving. There are many different ways to create cv mat object.

Consider using mat instead. Or use the universal filestorage i o functions to save the image to xml or yaml format. Possible parameter names for matrix cv mat. The class mat represents an n dimensional dense numerical single channel or multi channel array.

The parameters which you add to the cv mat must have a name which fits to the following rules. The name starts with a lower or upper case character hence a value between a z or a z. C abs a is equivalent to absdiff a scalar all 0 c. Type has the same meaning as in cvcreatemat.

The first character of the name can be followed by an infinite number of alpha numerical characters including characters like or. Multiple images vector of mat can be saved in tiff format see the code sample below. 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. Calculates an absolute value of each matrix element.

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.