Structure Element iplconvkernel and operations

In opencv, a structure is defined to describe structural elements in morphology. The structure is defined as follows:

Typedef struct _ iplconvkernel

{

Int ncols;

Int nrows;

Int anchorx;

Int anchory;

Int * values;

Int nshiftr;

}

Iplconvkernel;

Here, we will briefly describe the variable definition:

Ncols, nrows: the row width and column height of the structure element;

Anchorx and anchory: coordinates, horizontal, and vertical of the structure element origin (anchorx;

Nshiftr: used to represent the shape type of structural elements. It has the following values:

# Define cv_shape_rect 0

# Define cv_shape_cross 1

# Define cv_shape_ellipse 2

# Define cv_shape_custom 100

Rectangle, cross, elliptic, and custom.

Values: When nshiftr is custom, value is a pointer to the data of structural elements. If the size of structural elements is defined as 8*6, then values is a 48-long int array, the value is 0 or 1.

 

Two operations on the structure element iplconvkernel are defined in opencv for the creation and release of the structure element.

Cvcreatestructuringelementex
Create Structure Element
Iplconvkernel * cvcreatestructuringelementex (INT cols, int rows, int anchor_x, int anchor_y,
Int shape, int * values = NULL );
Cols
Number of columns of structure elements
Rows
Number of rows in the Structure Element
Anchor_x
Relative horizontal offset of the anchor
Anchor_y
Relative vertical offset of the anchor
Shape
The shape of the structure element, which can be the following values:
Cv_shape_rect, rectangular element;
Cv_shape_cross, a cross-shaped element;
Cv_shape_ellipse, an elliptical element;
Cv_shape_custom, a user-defined element. In this case, the values parameter defines the mask, that is, the neighbor of the pixel must be considered.
Values
A pointer to a structure element. It is a flat array that scans the element matrix row by row. (Non-zero point indicates that the point belongs to the structure element ). If the pointer is null, all elements in the flat array are non-zero, that is, the structure element is a rectangle (this parameter is considered only when the shape parameter is cv_shape_custom ).
The function CV createstructuringelementex allocates and fills the structure iplconvkernel, which can be used as a structural element in morphological operations.

 

Cvreleasestructuringelement

Delete structure elements
Void cvreleasestructuringelement (iplconvkernel ** element );
Element
Pointer to the deleted Structure Element
Function cvreleasestructuringelement releases the iplconvkernel structure. If * element is null, the function does not work.

For more information about the extension operations of other structural elements, see:

Http://lh2078.blog.163.com/blog/static/56811372201051891044624/