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[[Software#MSERs extrema connected-set filters and sieves|<span style="color:Green;">'''MORE'''</span>]]<br><br>
In development.
(This is work we did a while ago, a ''blast from the past''. I failed to popularise it at the time, however, '''MSER's are now attracting lots of attention''' so I'm now contributing my bit here in a hurry - [[http://cmpdartsvr3.cmp.uea.ac.uk/wiki/BanghamLab/index.php/Andrews_Organ_Recital Why the hurry?]]<br><br>
The algorithm for finding Maximally stable extremal regions (MSER's) '''is the same as an 'o' sieve'''. The terminology is confused. Such algorithms relate closely to mathematical morphology (openings, closings and in particular watersheds and reconstruction filters). In mathematical morphology the MSER algorithm ('o' sieve) might be called a 'connected-set opening'. It is one of a family of closely related algorithms which for which I coined the term '''sieves'''. Why? I was trying to unhook people from a misconception about 'filters'.<br><br>
 
At the time (and now) some people assert that Gaussian filters are '''unique''': the only scale-space preserving filters. So then it was '''nice to find''' that brains might also have Gaussian filter banks - computer scientists and biologists had a comfortable agreement that it had to be so.  'Uniqueness of the gaussian kernel for scale-space filtering' is a strong title.  The word ''linear'' is missing.  Sieves are non-linear and '''all sieves are also scale-space preserving'''. This is one of the properties that contributes to their success as feature finders.<br><br>
 
2D MSER's (sieves in our old terminology) are used for finding objects in. We have also used sieves in other ways, e.g. in 1D: for analysing ID protein hydrophobicity plots(Bangham, 1988<ref>Bangham, J.A. (1988). ''Data-sieving hydrophobicity plots. Anal. Biochem''. 174, 142–145</ref>), de-noising single channel current data(Bangham et al, 1984<ref>Bangham, J.A., and T.J.C. Jacob (1984). ''Channel Recognition Using an Online Hardware Filter''. In Journal of Physiology, (London: Physiological Society), pp. 3–5</ref>), texture analysis(Southam et al, 2009<ref>Southam, P., and Harvey, R. (2009). ''Texture classification via morphological scale-space: Tex-Mex features''. J. Electron. Imaging 18, 043007–043007</ref>), lipreading(Matthews et al., 2002<ref>Matthews, I., Cootes, T.F., Bangham, J.A., Cox, S., and Harvey, R. (2002). ''Extraction of visual features for lipreading''. Pattern Anal. Mach. Intell. Ieee Trans. 24, 198–213</ref>). In 2D for segmenting 2D through extremal trees(Bangham et al., 1998<ref>Bangham, J.A., Hidalgo, J.R., Harvey, R., and Cawley, G. (1998). ''The segmentation of images via scale-space trees''. In Proceedings of British Machine Vision Conference, pp. 33–43</ref>), maximally stable contours(Lan et al., 2010<ref>Lan, Y., Harvey, R., and Perez Torres, J.R. (2010). ''Finding stable salient contours.'' Image Vis. Comput. 28, 1244–1254</ref>), images (), creating painterly pictures from photos(Bangham et al., 2003<ref>Bangham, J.A., Gibson, S.E., and Harvey, R. (2003). T''he art of scale-space''. In Proc. British Machine Vision Conference, pp. 569–578</ref>); and in 3D for segmenting volumes.
 
 
Art created using ArtMaster was featured in an exhibit at the London Victoria and Albert (V&A) Museum exhibition '???' exhibition [http://www.sciencemuseum.org.uk/visitmuseum/galleries/turing.aspx finding its name]. <br>
[[Software#MSERs extrema connected-set filters and sieves|<span style="color:Navy;">More details on MSERs, extrema, connected-set filters and sieves</span>]]<br><br>
 
 
According to scientists, the Sun is pretty big <ref>E. Miller, The Sun, (New York: Academic Press, 2005), 23-5.</ref>.
In fact, it is very big <ref group="footnotes">Take their word for it. Don't look directly at the sun!</ref>.
 
==Notes==
<references group="footnotes" />
==References==
<references />

Revision as of 06:51, 3 July 2013

Bangham at UEA

Bangham Lab - Home

Current activity: a collaboration with the CoenLab with the aim of understanding how patterns of gene activity in biological organs influence the developing shape. The BanghamLab is focussed on the conceptual underpinning: concepts captured in computational growth models, experimental data visualisation and analysis.

Computational biology toolboxes

Growing complex biological shapes from patterns of gene expression

LabelledCropped GPT Snapdragon 2010-000340-0001.png LabelledCropped GPT Snapdragon 2010-000490-0001.png LabelledCropped GPT Snapdragon 2010-000570-0002.png LabelledCropped GPT Snapdragon 2010-000570-0007.png LabelledCropped GPT Snapdragon 2010-000570-0003 double.png LabelledCropped GPT Snapdragon 2010-000570-0002 triple.png


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Movies: Model Snapdragon flower movie, Why Snapdragon flower shape is so complex

The growth of a complex snapdragon flower shape. Key to the model, is an hypothesis on how organisers control the axes along which growth occurs. The organisers are shown in cyan and green. On the right are the shapes of two symmetrical mutants computed from the same model (hypotheses).

The Growing Polarised Tissue Framework for understanding and modelling the relationship between gene activity and the growth of shapes such leaves, flowers and animal embryos is introduced in (Kennaway et al 2011). The GPT-framework was used to capture an understanding of (to model) the Snapdragon flower Green et al 2011. The Snapdragon model was validated by comparing the results with other mutant and transgenic flowers Cui et al 2010.

The GPT-framework was also used to model the developing shape of Arabidopsis leaves as they grow (Kuchen et al 2012) a model that was extended to include Arabidopsis petals Sauret-Güeto et al 2013.

More details on growth

Viewing three dimensional images

Cs0prxz0.png Leaf trichomes.png Cs0prxz0.png GL2 GUS.png Leaf5.png OleosinSeed.png OPT Leaf copy.png Seedling copy.png Snapdragon Peloric mutant.png Tissue.png Z9r3j2yx.png 1896 wh txr light.png Ara flower.png Arableaf ath8 OPT.png


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Images of plants, plant organs and cells.

VolViewer uses OpenGL and Qt to provide a user friendly application to interactively explore and quantify multi-dimensional biological images. It has been successfully used in our lab to explore and quantify confocal microscopy and optical projection tomography images. It is open-source and is compatible with the Open Microscopy Environment (OME).

Movies of carnivorous plants

More details on viewing three dimensional images

Analysing shapes: faces, leaves and flowers

PortraitsMEANSsmaller.jpg
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Seen the origional paintings? Do they exist?.

The AAMToolbox is used to analyse the shape and colour of collections of similar objects. Originally developed to analyse face shapes for lipreading (Matthews et al. 2002version of pdf), we have used it extensively for analysing the shapes of leaves (Langlade et al 2005.,Bensmihen et al. 2010) and petals (Whibley et al 2006,Feng et al. 2010). The analysis can be applied to art, for example, finding systematic differences between portraits by Rembrandt and Modigliani.

More details on analysing shapes

Algorithms

Reaction-diffusion and morphogenesis - the growth of shapes

Tentacles reaction diffusion.png Tentacles morphogenesis.png


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In 1952 Alan Turing proposed The chemical basis of Morphogenesis - "... suggested that a system of chemical substances, called morphogens, reacting together and diffusing through a tissue, is adequate to account for the main phenomena of morphogenesis. Such a system, although it may originally be quite homogeneous, may later develop a pattern or structure due to an instability of the homogeneous equilibrium, which is triggered off by random disturbances. ..." Such patterning is now widely known. However, the morphogenesis element of the story has been less widely explored - here we illustrate the process using GFtbox - but also see: plant meristemreview related plant stuff

Two chemical substances react and diffuse to dynamically develop a pattern of spots (top row). We have added two simple growth rules (based on our hypotheses on the growth of shapes) to dynamically translate the pattern into a pattern of growth (bottom row). The changing geometry arising through growth which in turn feeds back on the reaction-diffusion system to modulate patterning. One of the morphogenesis rules uses the chemical concentration gradient to set the axes for anisotropic growth (arrows in third panel).

This model was featured in a video interview exhibit in the London Science Museum 'Codebreakers' exhibition Codebreakers.
More details on reaction-diffusion and morphogenesis

MSER's, extrema, Connected-set filters, Sieves and Scale-space


In development.

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