Road extraction is a topical research because of complexity due to his large topological variability. Increasing the spatial resolution generates noise which makes extraction difficult, especially in case of major disaster in an urban context. This problem increases false alarm rates and generally affects the performance of road extraction algorithm. Our aim is to improve the quality of roads extraction after adaptation of the Lowe's SIFT descriptors (scale-invariant feature transform) jointly with spectral angle algorithm. The characterization is performed on two image at various resolution images, respectively representing a rural and urban disaster area, captured by Quickbird satellite. Our approach significantly reduces the amount of false detection and shows an overall accuracy of up to nearly 30% in some cases.
In this paper, a new method for road extraction from very high resolution satellite images is introduced. The proposed methodology is based on multiscale analysis of the image through beamlet transform that can approximate edges of an image by means of line segments appearing at different resolution scales. The hypothesis of the membership of these segments to a road is verified by identification of parallel beamlets representing the main axes of the road. A reconstruction step of the road network is finally applied by aggregation of beamlets representing road candidates belonging to lower scales.
Cotton is a versatile plant grown for the fibers and these seeds. However, its culture dating numbers constraints productions including pest attacks. Faced with these attacks certain control methods prove ineffective. The research will be directed on stimulation of the natural defenses of the plant by applying elicitors to find an effective alternative to chemical control. Thus, the study of the influence of two elicitors (ethephon and methyl jasmonate) on the biosynthesis of phenolic compounds in the cultivar Y331B showed that the phenolic metabolism is significantly altered after treatment of the leaves by the elicitors. Two elicitors cause an increase in the production of phenolic compounds. However, the methyl jasmonate has the greater accumulation of phenolic compounds with respect to ethephon. Moreover, the co-processing of sheets by MeJA and ethephon has permit to obtain a significant increase in the levels of phenolic compounds.
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