Book contents
- Frontmatter
- Contents
- Authors and Contributors
- Preface
- Acknowledgements
- Outline and Roadmap
- 1 Overview
- 2 Physical Models
- 3 Localized Imaging
- 4 Tomographic Imaging
- 5 Digital Image Processing
- 6 Spectral Imaging
- 7 Mosaicing, Change Detection, and Multisensor Imaging
- 8 Numerical Simulation
- 9 Design of Subsurface Imaging Systems
- A Multi-Dimensional Signals and Systems
- B Linear Algebra
- C Detection and Classification
- D Software Tools
- Index
3 - Localized Imaging
Published online by Cambridge University Press: 05 June 2012
- Frontmatter
- Contents
- Authors and Contributors
- Preface
- Acknowledgements
- Outline and Roadmap
- 1 Overview
- 2 Physical Models
- 3 Localized Imaging
- 4 Tomographic Imaging
- 5 Digital Image Processing
- 6 Spectral Imaging
- 7 Mosaicing, Change Detection, and Multisensor Imaging
- 8 Numerical Simulation
- 9 Design of Subsurface Imaging Systems
- A Multi-Dimensional Signals and Systems
- B Linear Algebra
- C Detection and Classification
- D Software Tools
- Index
Summary
There are two principal configurations for imaging a three-dimensional (3D) object:
▪ Localized imaging, which is described in this chapter.
▪ Tomographic imaging, which is described in Chapter 4.
There are two configurations for localized probing of a 3D object:
▪ Axial sectioning, i.e., dividing the object into a set of axial lines parallel to the z axis in the depth direction, as shown in Fig. 3.0-1(a), and imaging each of these axial lines as a one-dimensional (1D) object – a function of z. Each 1D image is called an A-scan. A set of A-scans may be used to form a planar 2D image, e.g., in the x–z plane, called a B-scan, as shown in Fig. 3.0-1(b). A set of parallel B-scans may be used to form the entire 3D image.
▪ Lateral sectioning, i.e., dividing the object into lateral (transverse) planar slices, as shown in Fig. 3.0-1(c), and imaging each of these slices as a two-dimensional (2D) object, i.e., a function of x and y. Each 2D image is called a C-scan and the 3D image takes the form of a stack, called the z-stack.
In any of these configurations, the resolution of scanning and sectioning in the lateral and axial directions is dictated by the ability to localize the probe beam and/or the sensor beam, which is limited principally by the wavelength; the shorter the wavelength, the easier it is to localize.
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- Information
- Introduction to Subsurface Imaging , pp. 85 - 138Publisher: Cambridge University PressPrint publication year: 2011