S. R. Bhadra Chaudhuri

A Session Based Multiple Image Hiding Technique using DWT and DCT

This work proposes Steganographic technique for hiding multiple images in a color image based on DWT and DCT. The cover image is decomposed into three separate color planes namely R, G and B. Individual planes are decomposed into subbands using DWT. DCT is applied in HH component of each plane. Secret images are dispersed among the selected DCT coefficients using a pseudo random sequence and a Session key. Secret images are extracted using the session key and the size of the images from the planer decomposed stego image. In this approach the stego image generated is of acceptable level of imperceptibility and distortion compared to the cover image and the overall security is high.

A CPW fed planar monopole band notched UWB antenna with embedded split ring resonators

A novel planar monopole antenna for UWB application is designed using a CPW feed and incorporating band rejection of spurious WLAN and HIPERLAN/2A frequencies with the help of split ring resonators. Parametric study of the proposed antenna is also presented.

A Real Time Dactylology Based Feature Extractrion for Selective Image Encryption and Artificial Neural Network

Dactylology or Finger Spelling is popularly known as sign speech, is a kind of gesture based language used by the deaf and dumb people to communicate with themselves or with other people in and around them. In many ways FingerSpelling provides a connection between the sign and oral language. Dactylology can also be used for secret communication or can be used by the security personnel to communicate secretly with their counterpart. In the proposed work a two phase encryption technique has been proposed wherein the first phase a ‘Gesture Key’, generated from Indian Sign Language in real time has been used for encrypting the Region of Interests (ROIs) and in the second phase a session key has been used to encrypt the partially encrypted image further. The experimental results show that the scheme provides significant security improvement without compromising the image quality. The speed of encryption and decryption process is quite good. The Performance of the proposed scheme is compared with the few other popular encryption methods to establish the relevance of the work.

Design and analysis of a 5.88GHz microstrip phased array antenna for intelligent transport systems

Detection of blind spot area of an intelligent mobile vehicle is presented in this paper. In order to scan the concerning area, a phased array radar is designed. The approach is of two fold. Firstly, microstrip phased array antenna with progressive phased shifter is designed and subsequently, it is optimised for improvement of performance through parametric studies and array distribution using Tchebyscheff polynomial. Index Terms- Microstrip antenna, phased array antenna, intelligent transportation system, Tchebyscheff polynomial.

An Image Authentication Technique by Handwritten Signature Verification using DWT and ANN

Image authentication is important in content delivery to preserve originality as well as integrity of data. Using handwritten signature we can authenticate a person accurately. This paper proposes an efficient image authentication technique by hiding handwritten signature image in selected DWT sub-band of the image. At the receiver end signature image is extracted and verified with template signature using Artificial Neural Network and hence image authentication is achieved. General Terms Image Authentication, Handwritten Signature verification

PV embedded grid connected substation for enhancement of energy security

Remote areas of Utility Grid Network in developing countries like India suffer due to poor voltage regulation relating to peaks in demand and poor load factor. In this paper authors propose a rural substation configured with Battery Bank, Solar PV Array, Adjustable Power Converter and Inverters in order to offer advantages like constant power flow from grid and integration of Solar PV Array. Levelised Cost of Energy (LCOE) has been estimated with emphasis on cost of energy generation & energy storage components.

Phased array antenna design for intelligent transport systems

The present work is on the design of a microstrip phase array antenna with the required feed elements for the phased array radar that is used to detect the blind spot area of an intelligent mobile vehicle. The current ratio and side lobe level of the array is calculated using Tchebyscheff distribution.

Bandwidth enhancement of microstrip antennas using shifted parasitically coupled planar multiresonators

In this paper, a wideband planar multi resonator antenna with parasitic coupling is proposed and studied. Impedance and radiation characteristics of this antenna are presented and discussed. From the results, it has been observed that, the Impedance bandwidth, defined by 10dB return loss, can reach an operating bandwidth of 251 MHz with center operating frequency of 3023 MHz, which is about four times that of conventional reference patch antenna. The gain of studied antenna is also observed with peak gain of about 8.33dBi.

A novel circularly polarized dsrc band square microstrip antenna using minkowski fractal structure for vehicular communication

This paper proposes the design of a novel Minkowski circularly polarized square microstrip fractal antenna to operate within the full range of 75MHz DSRC band (Dedicated Short-Range CommunicationsIEEE 802.11p) with the center frequency at 5.9GHz for vehicle to vehicle communication purpose in an Intelligent Transport System (ITS). Compared to the conventional square patch, the use of Minkowski fractal reduces the overall area of the patch considerably at 5.9GHz with 7.4dBi Gain. More than 3dB Gain is maintained throughout a Bandwidth of 600MHz (5.6GHz to 6.2GHz). Axial Ratio of the antenna is also achieved below 3dB for the entire 267MHz Bandwidth from 5.73GHz to 6GHz.

Investigations on a dual-frequency micro strip antenna for wireless applications

In this paper, the design of a micro strip patch antenna is reported which can be operated at GPS (Global Positioning System) and Bluetooth frequencies. Very small thin micro strip antenna is excited by a co-axial SMA connector to produce centre frequency of a Bluetooth system and the correct feed position is determined for impedance matching. Then a thin parasitic micro strip patch is coupled with this patch to excite the centre frequency of GPS system. The simulated results using IE3D software are supported by measurement.