Morphology in matlab

Morphology

strel constructs structuring elements with a variety of shapes and sizes. Its basic syntax is

se=strel(shape,parameters)

se1 = strel('square',11)      % 11-by-11 square
se2 = strel('line',10,45)     % length 10, angle 45 degrees
se3 = strel('disk',15)        % disk, radius 15
se4 = strel('ball',15,5)      % ball, radius 15, height 5

strel(’diamond’,R)	Creates a flat, diamond-shaped structuring element,where R specifies the distance from the structuring element origin to the extreme points of the diamond
strel(’disk’,R)	Creates a flat, disk-shaped structuring element with radius R.
strel(’line’,LEN,DEG)	Creates a flat, linear structuring element, where LEN specifies the length, and DEG specifies the angle (in degrees) of the line, as measured in a counterclock-wise direction from the horizontal axes
strel(’octagon’,R)	Creates a flat, octagonal structuring element, where R specifies the distance from the structuring element origin to the sides of the octagon, as measured along the horizontal and vertical axes. R must be a nonnegative multiple of 3
strel(’pair’,OFFSET)	Creates a flat structuring element containing two members. One member is located at the origin. The second member’s location is specified by the vector OFFSET, which must be a two-element vector of integers.
strel(’periodicline’,P,V)	Creates a flat structuring element containing 2*P+1members.Vis a two-element vector con-taining integer-valued row and column offsets.One structuring element member is located atthe origin. The other members are located at1*V,-1*V,2*V,-2*V,V.
strel(’rectangle’,MN)	Creates a flat, rectangle-shaped structuring element, where MN specifies the size. MN must be a two- element vector of nonnegative integers. The first ele- ment of MN is the number of rows in the structuring el-ement; the second element is the number of columns
strel(’square’,W)	Creates a square structuring element whose width is W pixels. W must be a nonnegative integer scalar
strel(NHOOD)	Creates a structuring element of arbitrary shape. NHOOD is a matrix of 0s and 1s that specifies the shape

a=imread(‘image.jpg’);

% invert the array

a=255-a;

%create structuring element

se=strel(‘disk’,7);

a_erode=imerode(a,se);

a_dilate=imdilate(a,se);

a_open=imopen(a,se);

a_closed=imclose(a,se);

or

a=imread(‘image.jpg’);

B=[0 1 0;1 1 1;0 1 0];

A2=imdilate(a,B);