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Basic Python Scripts to Save and Load Images

Figure 4. Middle part of Lena test image in grayscale.

In this article, I list basic scripts to save and load images. As always, I’ve assumed that you want to use NumPy and SciPy for processing your data, and that you use floating point numbers for all processing and…

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  • Image Processing
  • Software
Submitted on 8 May 2022

What is an Engel Expansion?

It turns out that each positive real number \(x\in\mathbb{R}^+\) can be written in the form \(x=1/a_1+1/a_1a_2+1/a_1a_2a_3+\cdots\), where \({a_1,a_2,a_3,\ldots}\) is a unique non-decreasing sequence, finite or infinite, of postive integers. This is called the Engel expansion of \(x\), after…

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  • Mathematics
Submitted on 11 April 2022

Basic Python Scripts to Save and Load Audio Files

Each time I need to do something with audio, one dimensional signal processing in general, or images, I need to go through my collection of Python scripts to help me remember once again which library to use to save and load them. To make this easier…

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  • Signal Processing
  • Software
Submitted on 4 March 2022

How to Tweet from Python

After deciding that I’d like to automate a weekly tweet of one of my existing blog post, to keep you entertained a bit more now that my posting frequency has diminished lately, I started by googling the different tools and platforms that can be used to do that. However…

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  • Software
Submitted on 6 February 2022

TomRoelandts.com in 2021

After 2020, 2021 was a another really quiet year on this blog, this time with a grand total of five articles posted… And, of those five articles, four were part of the tutorial Reconstruction of a Real Dataset. Although I do have to say that that tutorial took…

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  • Stuff
Submitted on 2 January 2022

Cherenkov Radiation

Figure 1. Cherenkov radiation in the core of the Advanced Test Reactor [image: Argonne National Laboratory].

Cherenkov radiation is best know for the eerie blue glow in the water around the core of nuclear reactors. It was named after the Russian scientist Pavel Cherenkov, who received the 1958 Nobel Prize in Physics for its discovery. It is…

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  • Physics
Submitted on 5 December 2021

Reconstruction of a Real Dataset, Part 4: The Actual Reconstruction

Figure 1. Central slice of the reconstruction.

This is part four of a tutorial that describes how to create a reconstruction of a cone-beam computed tomography (CT) dataset. In this part, I’ll show how to create the actual reconstruction from the projections that were created in…

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  • Image Processing
  • Tomography
Submitted on 21 June 2021

Reconstruction of a Real Dataset, Part 3: Conversion to Projections

Figure 2. Projection image.

This is part three of a tutorial that describes how to create a reconstruction of a cone-beam computed tomography (CT) dataset. In this part, I’ll show how to convert the preprocessed images from part two into projections…

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  • Image Processing
  • Tomography
Submitted on 23 May 2021

Reconstruction of a Real Dataset, Part 2: Flat Field Correction

Corrected X-ray image.

This is part two of a tutorial that describes how to create a reconstruction of a cone-beam computed tomography (CT) dataset. In this part, I’ll show how to preprocess the images to correct them for variations of the X-ray source intensity and…

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  • Image Processing
  • Tomography
Submitted on 26 April 2021

Reconstruction of a Real Dataset, Part 1: Introduction

Figure 1. Raw X-ray image of an apple.

This is part one of a tutorial that describes how to create a reconstruction of a cone-beam computed tomography (CT) dataset. This tutorial includes the preprocessing step that is needed to go from raw X-ray images to projections that…

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  • Image Processing
  • Tomography
Submitted on 7 April 2021

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