Indian Institute of Technology Kharagpur

About: Indian Institute of Technology Kharagpur is a education organization based out in Kharagpur, India. It is known for research contribution in the topics: Natural rubber & Dielectric. The organization has 16887 authors who have published 38658 publications receiving 714526 citations.

Multilevel Thresholding for Image Segmentation through a Fast Statistical Recursive Algorithm

Abstract: A novel algorithm is proposed for segmenting an image into multiple levels using its mean and variance. Starting from the extreme pixel values at both ends of the histogram plot, the algorithm is applied recursively on sub-ranges computed from the previous step, so as to find a threshold level and a new sub-range for the next step, until no significant improvement in image quality can be achieved. The method makes use of the fact that a number of distributions tend towards Dirac delta function, peaking at the mean, in the limiting condition of vanishing variance. The procedure naturally provides for variable size segmentation with bigger blocks near the extreme pixel values and finer divisions around the mean or other chosen value for better visualization. Experiments on a variety of images show that the new algorithm effectively segments the image in computationally very less time.

Synthesis, characterization and electrochemical performance of graphene decorated with 1D NiMoO4·nH2O nanorods

Abstract: One-dimensional NiMoO4·nH2O nanorods and their graphene based hybrid composite with good electrochemical properties have been synthesized by a cost effective hydrothermal procedure. The formation of the mixed metal oxide and the composite was confirmed by XRD, XPS and Raman analyses. The morphological characterizations were carried out using FESEM and TEM analyses. The materials were subjected to electrochemical characterization through cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and electrochemical impedance spectroscopy (EIS) studies with 6 M KOH as the supporting electrolyte. For NiMoO4·nH2O, a maximum specific capacitance of 161 F g−1 was obtained at 5 A g−1 current density, accompanied with an energy density of 4.53 W h kg−1 at a steady power delivery rate of 1125 W kg−1. The high utility of the pseudocapacitive NiMoO4·nH2O was achieved in its graphene based composite, which exhibited a high specific capacitance of 367 F g−1 at 5 A g−1 current density and a high energy density of 10.32 W h kg−1 at a power density of 1125 W kg−1 accompanied with long term cyclic stability.