Why Clipping Should Be Avoided

Figure 2. Clipped sine.

Before you can digitally process an analog (i.e., real-world) signal, you have to convert it to a digital form by sampling it. A very important aspect of this conversion is that you should avoid clipping the original signal. Clipping happens when… read more

Submitted on 16 February 2015

New Horizons

Figure 1. New Horizons at Pluto [image: JHUAPL/SwRI].

After mentioning Rosetta in June, there is another deep space mission that I want to bring to your attention. The final preparations for the flyby of Pluto by the New Horizons spacecraft have started. New Horizons will be… read more

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Submitted on 14 December 2014

The PDART Algorithm, Part 2

Figure 2. SIRT (left) and mask (right) at iteration 8.

This is the second of a two-part article on the PDART algorithm. It explains most of the nitty-gritty details. The PDART algorithm needs two extra input parameters to do its magic, a threshold and a gray level. After each SIRT iteration, each pixel of… read more

Submitted on 24 August 2014

The PDART Algorithm, Part 1

Figure 1. Phantom image (left) and SIRT reconstruction (right).

This article is a bit of an experiment. In it, I’ll try to explain PDART, an example of current algorithm research in computed tomography (PDART was published in 2011). What the algorithm does is, in a nutshell, a SIRT reconstruction with intermediate… read more

Submitted on 11 August 2014

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