20 research outputs found
Fast View Synthesis with Deep Stereo Vision
Novel view synthesis is an important problem in computer vision and graphics.
Over the years a large number of solutions have been put forward to solve the
problem. However, the large-baseline novel view synthesis problem is far from
being "solved". Recent works have attempted to use Convolutional Neural
Networks (CNNs) to solve view synthesis tasks. Due to the difficulty of
learning scene geometry and interpreting camera motion, CNNs are often unable
to generate realistic novel views. In this paper, we present a novel view
synthesis approach based on stereo-vision and CNNs that decomposes the problem
into two sub-tasks: view dependent geometry estimation and texture inpainting.
Both tasks are structured prediction problems that could be effectively learned
with CNNs. Experiments on the KITTI Odometry dataset show that our approach is
more accurate and significantly faster than the current state-of-the-art. The
code and supplementary material will be publicly available. Results could be
found here https://youtu.be/5pzS9jc-5t
Genetic diversity in tef [Eragrostis tef (Zucc.) Trotter]
Tef [Eragrostis tef (Zucc.) Trotter] is a cereal crop resilient to adverse climatic and soil conditions, and possessing desirable storage properties. Although tef provides high quality food and grows under marginal conditions unsuitable for other cereals, it is considered to be an orphan crop because it has benefited little from genetic improvement. Hence, unlike other cereals such as maize and wheat, the productivity of tef is extremely low. In spite of the low productivity, tef is widely cultivated by over six million small-scale farmers in Ethiopia where it is annually grown on more than three million hectares of land, accounting for over 30% of the total cereal acreage. Tef, a tetraploid with 40 chromosomes (2n = 4x = 40), belongs to the family Poaceae and, together with finger millet (Eleusine coracana Gaerth.), to the subfamily Chloridoideae. It was originated and domesticated in Ethiopia. There are about 350 Eragrostis species of which E. tef is the only species cultivated for human consumption. At the present time, the gene bank in Ethiopia holds over five thousand tef accessions collected from geographical regions diverse in terms of climate and elevation. These germplasm accessions appear to have huge variability with regard to key agronomic and nutritional traits. In order to properly utilize the variability in developing new tef cultivars, various techniques have been implemented to catalog the extent and unravel the patterns of genetic diversity. In this review, we show some recent initiatives investigating the diversity of tef using genomics, transcriptomics and proteomics and discuss the prospect of these efforts in providing molecular resources that can aid modern tef breeding
Growth and Yield Performance of Maize Seeded in Line and Broadcasted to Varying Doses of Nitrogen
Improving production
through better agronomic management is
continued to feed ever-increasing
population. The objective of this study was
to quantify the effect of N on maize seeded
in line or broadcasted. Treatments included
four level of urea nitrogen (N), i.e. 0, 60,
120 and 180 kg ha-1 and two sowing
techniques, i.e. drill sowing (improved) and
broad cast (farmer practice). Improved
method of sowing had improved yield and
yield contributing parameters whereas
emergence m-2 and biological yield was
higher in broadcast method of sowing.
Increasing N application had increased
biological yield, number of plants at harvest
and grains ear-1 linearly. Cobs per plant,
grain yield, 1000 grains weight and harvest
index showed sigmoid response to N
application and was maximum at 120 kg N
ha-1. Sowing of maize seed in line method
and receiving 120 kg N ha-1 had increased
grain yield by 45% over broad cast method
of sowing receiving the same dose of
nitrogen. However, the farmer practices
method had increased the forage (straw)
when received higher amount of N, i.e. 180
kg N ha-1. Thus, it is concluded from the
experiment that application of 120 kg N ha-1
and seed sown in line had increased the
yield and yielding parameters, compared to
other treatments and is, therefore,
recommended for general cultivation of
variety Azam in agro-climatic condition of
Peshawar
Micronutrient deficiencies in African soils and the human nutritional nexus: opportunities with staple crops
A synthesis of available agronomic datasets and peer-reviewed scientific literature was conducted to: (1) assess the status of micronutrients in sub-Saharan Africa (SSA) arable soils, (2) improve the understanding of the relations between soil quality/management and crop nutritional quality and (3) evaluate the potential profitability of application of secondary and micronutrients to key food crops in SSA, namely maize (Zea mays L.), beans (Phaseolus spp. and Vicia faba L.), wheat (Triticum aestivum L.) and rice (Oryza sativa L.). We found that there is evidence of widespread but varying micronutrient deficiencies in SSA arable soils and that simultaneous deficiencies of multiple elements (co-occurrence) are prevalent. Zinc (Zn) predominates the list of micronutrients that are deficient in SSA arable soils. Boron (B), iron (Fe), molybdenum (Mo) and copper (Cu) deficiencies are also common. Micronutrient fertilization/agronomic biofortification increases micronutrient concentrations in edible plant organs, and it was profitable to apply fertilizers containing micronutrient elements in 60-80% of the cases. However, both the plant nutritional quality and profit had large variations. Possible causes of this variation may be differences in crop species and cultivars, fertilizer type and application methods, climate and initial soil conditions, and soil chemistry effects on nutrient availability for crop uptake. Therefore, micronutrient use efficiency can be improved by adapting the rates and types of fertilizers to site-specific soil and management conditions. To make region-wide nutritional changes using agronomic biofortification, major policy interventions are needed