Lecture 3: writing style
You need to choose one of the following papers and summarise it in 500 words. Marks will be awarded for the quality of the summarisation (how well it represents the paper) and the quality of the writing (how well it reads). You are not expected to review or critique the paper.
Please format your summary with double-line spacing and wide margins.
- "Balancing the expected and the
surprising in geometric Op art", N. A. Dodgson,
Computers & Graphics
Subject areas: experimentation on human subjects, art, perception, psycho-physics.
Abstract: I investigate the trade-off between the expected and the surprising in certain geometric patterns. This work is inspired by Bridget Riley's early Op art pieces, White Discs 2 (1964) and Fragment 6/9 (1965). I analyse these two works, investigate a range of variants, and propose hypotheses about the perceptual effects in patterns like these. The key hypothesis is that there is an æsthetically interesting range where between a quarter and a half of a regular pattern is adjusted in some way. I report on a perceptual experiment that tests and supports this hypothesis, and discuss the implications.
multi-projector autostereoscopic 3D display",
N. A. Dodgson, J. R. Moore, S. R. Lang, G. Martin and P. Canepa,
J. Soc. for Information Display 8(2):169–176,
Subject areas: electrical engineering, display design.
Abstract:We describe a new 28 view, 25 inch, autostereoscopic display which combines both time sequential and multi-projector technology. It is constructed from four time sequential subsystems, which abut behind a single ferroelectric liquid crystal shutter. The display has a resolution of 512×384 pixels in 24-bit colour. It allows multiple viewers to simultaneously view stereoscopic images without the need for special glasses or headgear.
compression using sparse colour sampling combined with nonlinear
image processing", S. Brooks, I. Saunders and
N. A. Dodgson, presented at "Human Vision and Electronic Imaging
XII", San Jose, California, 29 Jan–1 Feb 2007, published in
Proc. SPIE 6492, 2007.
Subject areas: image processing, human perception.
Abstract:We apply two recent non-linear, image-processing algorithms to colour image compression. The two algorithms are colorization and joint bilateral filtering. Neither algorithm was designed for image compression. Our investigations were to ascertain whether their mechanisms could be used to improve the image compression rate for the same level of visual quality. Both show interesting behaviour, with the second showing a visible improvement in visual quality, over JPEG, at the same compression rate. In both cases, we store luminance as a standard, lossily compressed, greyscale image and store colour at a very low sampling rate. Each of the non-linear algorithms then uses the information from the luminance channel to determine how to propagate the colour information appropriately to reconstruct a full colour image.
butterfly subdivision scheme for surface interpolation with tension
control", N. Dyn, D. Levin, and J. A. Gregory, ACM
Transactions on Graphics 9(2):160–169, 1990.
Subject areas: computer graphics, mathematical representation of surfaces.
Abstract:A new interpolatory subdivision scheme for surface design is presented. The new scheme is designed for a general triangulation of control points and has a tension parameter that provides design flexibility. The resulting limit surface is C1 for a specified range of the tension parameter, with a few exceptions. Application of the butterfly scheme and the role of the tension parameter are demonstrated by several examples.
These particular papers are selected because the lecturer knows them all well. They are chosen across a range of disciplines. Engineers may prefer the display paper, mathematicians may prefer the subdivision paper, computer scientists may prefer the compression paper, those interested in experimental design and evaluation may prefer the Op art paper.
The list of resources has been moved to Lecture 6, as it is the homework for that lecture.