Picture of blood cells

Open Access research which pushes advances in bionanotechnology

Strathprints makes available scholarly Open Access content by researchers in the Strathclyde Institute of Pharmacy & Biomedical Sciences (SIPBS) , based within the Faculty of Science.

SIPBS is a major research centre in Scotland focusing on 'new medicines', 'better medicines' and 'better use of medicines'. This includes the exploration of nanoparticles and nanomedicines within the wider research agenda of bionanotechnology, in which the tools of nanotechnology are applied to solve biological problems. At SIPBS multidisciplinary approaches are also pursued to improve bioscience understanding of novel therapeutic targets with the aim of developing therapeutic interventions and the investigation, development and manufacture of drug substances and products.

Explore the Open Access research of SIPBS. Or explore all of Strathclyde's Open Access research...

Rotational scanning techniques for hyperspectral imaging

Kelman, Timothy and Marshall, Stephen and Ren, Jinchang and Gilchrist, John (2012) Rotational scanning techniques for hyperspectral imaging. In: Hyperspectral Imaging Conference, 2012-05-15 - 2012-05-16.

[img]
Preview
Text (Kelman-etal-HIC-2012-Abstract-Rotational-scanning-techniques-for-hyperspectral)
Kelman_etal_HIC_2012_Abstract_Rotational_scanning_techniques_for_hyperspectral.pdf
Accepted Author Manuscript
License: Unspecified

Download (117kB)| Preview

    Abstract

    Since hyperspectral images form three dimensional data structures, data acquisition usually requires that two of the dimensions remain constant, whilst the third is varied. A popular method for capturing hyperspectral data is pushbroom scanning. This technique builds an image by incrementally capturing all available wavelengths on a spatial line scan over time. One drawback of this technique is that an accurate way of linearly moving the camera or the object is required. Rotational movement is often easier to achieve or naturally available, hence the work presented here investigates an alternative approach to the traditional pushbroom method. If the rotation of the object is perfectly aligned (i.e. the axis of rotation is coincident with the leftmost pixel for anti-clockwise rotation) the acquired hypercube is, in fact, a polar representation of the scanned object. This ideal polar representation can be easily converted to Cartesian form using existing toolboxes [1] to produce a conventional hypercube. While rotational movement is often easier to achieve than the translational motion required by pushbroom, near perfect rotation is often not possible. There are two main sources of error when using rotational scanning: horizontal offset and vertical offset. These offsets occur when the axis of rotation does not precisely coincide with the desired pixel as described above. This paper explains, using examples, a method to compute these two parameters such that they can be used to compensate for the errors caused by these offsets. Although polar to Cartesian conversion can be calculated, there is no guarantee that each pixel stored in polar form can be mapped to a unique point in Cartesian space. As such, a suitable interpolation method is required to compensate for this. A number of such techniques are discussed and evaluated in this paper. This work will lead to the development of a tool which will be capable of automatically estimating the offset parameters. Further investigation into other forms of error in rotational scanning will also be carried out (e.g. non-circular rotation).