Automatic Classification of Aerial Imagery

The aerial imagery obtained from reconnaissance platform is voluminous and the defenceforces rely on image information to perform intelligent tasks. The application of a welldesigned automatic image classifier would enhance the end results of different high levelapplications thereby abridging the effort of a human analyst. Automatic image classifierscould be designed using a training data set for supervised learning or using an unsupervisedlearning. In this paper, a method, which combines both unsupervised and supervised methodsof learning is proposed

Terrain Classification using Multiple Image Features

A wide variety of image processing applications require segmentation and classification ofimages. The problem becomes complex when the images are obtained in an uncontrolledenvironment with a non-uniform illumination. The selection of suitable features is a critical partof an image segmentation and classification process, where the basic objective is to identify theimage regions that are homogeneous but dissimilar to all spatially adjacent regions. This paperproposes an automatic method for the classification of a terrain using image features such asintensity, texture, and edge. The textural features are calculated using statistics of geometricalattributes of connected regions in a sequence of binary images obtained from a texture image.A pixel-wise image segmentation scheme using a multi-resolution pyramid is used to correct thesegmentation process so as to get homogeneous image regions. Localisation of texture boundariesis done using a refined-edge map obtained by convolution, thinning, thresholding, and linking.The individual regions are classified using a database generated from the features extracted fromknown samples of the actual terrain. The algorithm is used to classify airborne images of a terrainobtained from the sensor mounted on an aerial reconnaissance platform and the results arepresented

A novel amperometric catechol biosensor based on α-Fe2O3 nanocrystals-modified carbon paste electrode

In this work, we designed an amperometric catechol biosensor based on α-Fe2O3 nanocrystals (NCs) incorporated carbon-paste electrode. Laccase enzyme is then assembled onto the modified electrode surface to form a nanobiocomposite enhancing the electron transfer reactions at the enzyme’s active metal centers for catechol oxidation. The biosensor gave good sensitivity with a linear detection response in the range of 8–800 μM with limit of detection 4.28 μM. We successfully employed the sensor for real water sample analysis. The results illustrate that the metal oxide NCs have enormous potential in the construction of biosensors for sensitive determination of phenol derivatives

Economic performance of motorised and non-mechanised fishing methods during and after-ban period in Ramanathapuram District of Tamil Nadu

Ramanathapuram is an important coastal district significantly contributing to the marine fish production of Tamil Nadu State. The coastal length, number of fishing villages and fishing activities is more in Ramanathapuram District in comparison to other coastal districts in Tamil Nadu. The present study analysed the economic performance of motorised and non-mechanised craft-gear combinations during and after-ban period in Ramanathapuram District. In motorised single day craft-gear combinations, the capital productivity was higher during ban period in comparison with after-ban period, with a lower operating ratio ranging from 0.55 for gillnetter to 0.58 for bottom-set gillnetter. In motorised multi-day craft-gear combinations, the capital productivity during ban, was more in comparison with after-ban period with a lower operating ratio of 0.64 for trawler and gillnetter. In non-mechanised craft-gear combinations, during ban, the capital productivity was higher in comparison with after-ban period with a lower operating ratio ranging from 0.49 for gillnetter to 0.52 for bottom-set gillnetter. It was found that during ban period, capital productivity was high in non-mechanised gillnetter and bottom set gillnetter, while the catch, labour productivity and income were high in multi-day (2-4 days) trawler and gillnetter

Migrant labourers in the Primary Sector of Marine Fisheries: A Case study in Karnataka

Migration is perceived as a way of life, a coping mechanism often providing a means of alternate livelihood to the human population ever since the dawn of civilisation. Migration is a worldwide phenomenon and perceived as the movement of people/ animals/ birds and insects from less endowed areas to greener pastures in search of better income, food, work or even more suitable socio-economic/geographic milieu. One of the popular forms of migration namely the economic migration has resulted from unequal development trajectories (McDowell and De Haan, 1997; Kothari, 2002). This supposedly led to one-way population movements from less endowed areas to well-endowed prosperous areas through the ‘push’ created by poverty and a lack of work and the ‘pull’ created by better wages in the destination (Lee, 1966). Theories of urban expansion were in agreement with this analysis of migration. Ideas of seasonal and circular labour migration were first articulated in the 1970s (Nelson, 1976; Rao, 1994) and defined as ‘characteristically short term, repetitive or cyclical in nature, and adjusted to the annual agricultural cycle’

A Rapid Protocol for Somatic Embryogenesis Mediated Regeneration in Banana (Musa Spp.) Cv. Nendran

A simple and rapid protocol for somatic embryogenesis in banana cv. Nendran (AAB) using immature male flowers (IMF) has been developed. The IMF produced palewhite to yellow, globular embryogenic callus on MS medium supplemented with BA (0.05 - 0.50mgL-1) and picloram (0.50 - 2.00mgL-1) with explant response of to 30 per cent. Addition of ascorbic acid (20mgL-1) and Gelrite© (0.45 per cent) to callus induction medium reduced interference from phenolic exudation. Embryogenesis was induced (33.3 to 60 per cent) on semisolid (0.30 per cent Gelrite©) MS medium supplemented with BA 2mgL-1 + IAA 0.5mgL-1. The somatic embryos showed 60-80 per cent germination on half- strength semisolid MS medium with BA 2mgL-1 + IAA 0.5mgL-1. Transfer of germinated embryos to semisolid MS medium supplemented with BA 2mgL-1 + NAA 1mgL-1under 14 h light /8h dark photoperiod resulted in hundred percent conversion to plantlets. This protocol takes merely 6 months for producing plantlets from immature flower buds through somatic embryogenesis, without any intermediate liquid cultures