Articles by Christian Chapman

  1. Modifying a Plustek 8100 to Scan Medium Format

    The Plustek 8100 is a relatively cheap but good quality film scanner. It produces much nicer scans than most flatbed-type scanners, but it can only capture small format film. In this page I show how to modify a Plustek 8100 to scan medium format (120 film) by stitching together multiple …

  2. Hypersphere Cap Volumes in Matlab

    The volume of a height-h cap of a ball of radius r in dimension n can be derived:

    \begin{equation} \operatorname{vol}(\operatorname{cap}) = \frac{1}{2} \cdot \frac{\pi^{n/2}}{\Gamma\left(1+n/2\right)} \cdot r^n \cdot I_{(2rh-h^2)/r …
  3. On Suboptimality of the Berger-Tung Bounds

    The Berger-Tung inner and outer bounds give a approximation to the rate-distortion region in lossy distributed source coding. The regions are not tight in general. Their tightness is discussed throughout Chapter 12 of Network Information Theory by El Gamal and Kim (in particular Section 12.5), but even so I …

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