hofig1s1a
Probing an image

The binary image to be processed is read. The structuring element is created from box of radius 25.

from morph import *

from handson import *

F=mmreadgray('blob_1.tif')

print 'The pixel datatype of image F is ',mmdatatype(F)

The pixel datatype of image F is  binary

mmshow(F)

B=mmsebox(25)

mmshow(mmseshow(B))

F	mmseshow(B)

An image of two points to translate the structuring element is created. The 3x3 elementary cross is placed on these points to mark them more clearly. Then this image with the two points is dilated by the structuring element.

Z=mmsubm(F,F)

Z[80,120]=1; Z[160,240]=1

Z1=mmdil(Z)

mmshow(Z1)

Z2=mmdil(Z,B)

mmshow(Z2)

Z1	Z2

A symmetrical difference can show simultaneously the image with points and the image with the translated structuring elements. The edges of this image shows the contour of the structuring elements.

T=mmsymdif(Z2,Z1)

mmshow(T)

E=mmgradm(T) # edges

mmshow(E)

T	E

The original image and the edges of the translated structuring elements are combined using their symmetrical difference.

G=mmsymdif(F,E)

mmshow(G)

G

A simpler illustration can be computed using the color overlay facility of mmshow.

mmshow(F,Z2,Z1)

F,Z2,Z1