5th Intensive Course on Soil Micromorphology

1
5th Intensive Course on Soil Micromorphology
Naples 2001
12th - 14th September Image Analysis
Lecture 8 Introduction to Binary Morphology
2
5th Intensive Course on Soil Micromorphology -
Naples 2001 Image Analysis - Lecture 8 Binary
Morphology
Introduction to Binary Morphology Methods
Requires Segmentation of Image into Binary Form
(may require manual editting). Foreground
pixels are coded 1 - background 0 i.e.
Particles 1 (white), voids 0 (black) or Voids
1 (white), particles 0 (black)

• Erosion/Dilation
• Opening/Closing
• Kernel Shapes

Applications in Particle / Void Size Distribution
3
5th Intensive Course on Soil Micromorphology -
Naples 2001 Image Analysis - Lecture 8 Binary
Morphology
Erosion strips one layer of foreground pixels at
edges of particles criteria based on number of
surrounding background pixels can be any number
1 - 8 pixel of interest is red white -
foreground black - background
4
5th Intensive Course on Soil Micromorphology -
Naples 2001 Image Analysis - Lecture 8 Binary
Morphology
a) foreground pixel removed for all
criteria. h) foreground pixel removed only if
criteria is set to 1 pixel.
Criteria may also specify that diagonal erosion
is (or is not permitted). Erosion not permitted
if diagonals not allowed in (j)
5
5th Intensive Course on Soil Micromorphology -
Naples 2001 Image Analysis - Lecture 8 Binary
Morphology
Connectivity 4 - point connectivity allows
connection only up/down and side to side 8 -
point connectivity allows connection on diagonals
In 4 - point connectivity, foreground and
background are uniquely separated. In 8 - point
connectivity is background or foreground
continuous across diagonal? Both are not possible
6
5th Intensive Course on Soil Micromorphology -
Naples 2001 Image Analysis - Lecture 8 Binary
Morphology
Erosion of original by one layer criterion - a
single touching background pixel
4 - point connectivity
8 - point connectivity
7
5th Intensive Course on Soil Micromorphology -
Naples 2001 Image Analysis - Lecture 8 Binary
Morphology
Erosion by 2 and 3 layers 8 - point
connectivity All foreground features will
disappear.
Erosion by 2 and 3 layers 4 - point
connectivity Some residual parts of largest
particle remain.
8
5th Intensive Course on Soil Micromorphology -
Naples 2001 Image Analysis - Lecture 8 Binary
Morphology
9
5th Intensive Course on Soil Micromorphology -
Naples 2001 Image Analysis - Lecture 8 Binary
Morphology
10
5th Intensive Course on Soil Micromorphology -
Naples 2001 Image Analysis - Lecture 8 Binary
Morphology
11
5th Intensive Course on Soil Micromorphology -
Naples 2001 Image Analysis - Lecture 8 Binary
Morphology
12
5th Intensive Course on Soil Micromorphology -
Naples 2001 Image Analysis - Lecture 5
Thresholding/Segmentation