5th Intensive Course on Soil Micromorphology Naples th - 14th September Image Analysis Lecture 8 Introduction to Binary Morphology

5th Intensive Course on Soil Micromorphology - Naples 2001 Image Analysis - Lecture 8: Binary Morphology Erosion/Dilation Opening/Closing Kernel Shapes Applications in Particle / Void Size Distribution 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)

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 pixel of interest is red white - foreground black - background

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)

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

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 connectivity8 - point connectivity

5th Intensive Course on Soil Micromorphology - Naples 2001 Image Analysis - Lecture 8: Binary Morphology Erosion by 2 and 3 layers 4 - point connectivity Some residual parts of largest particle remain. Erosion by 2 and 3 layers 8 - point connectivity All foreground features will disappear.

5th Intensive Course on Soil Micromorphology - Naples 2001 Image Analysis - Lecture 8: Binary Morphology

5th Intensive Course on Soil Micromorphology - Naples 2001 Image Analysis - Lecture 8: Binary Morphology

5th Intensive Course on Soil Micromorphology - Naples 2001 Image Analysis - Lecture 8: Binary Morphology

5th Intensive Course on Soil Micromorphology - Naples 2001 Image Analysis - Lecture 8: Binary Morphology

5th Intensive Course on Soil Micromorphology - Naples 2001 Image Analysis - Lecture 5: Thresholding/Segmentation