Sahadev Roy

A Novel Approach for Character Recognition

Abstract — “Optical Character Recognition”, abbreviated as OCR has become a very important aspect of life in today’s world especially in Computer vision applications, and also in the field of Robotics. Our basic objective is to develop an efficient approach which can recognize the input printed-text with a high level of accuracy so that its output can be utilized in our final goal which is an English-Text to multilingual Translator. In this paper the methodology adopted to implement OCR is mainly explained in detail along with emphasizing the necessity and advantages over the present technique. In this paper, an efficient approach for optical Character recognition of printed text has been analyzed. The problems associated with Character Recognition are also mentioned. A Graphical User Interface (GUI), in this paper represented for that purpose. Keywords — Optical Character Recognition, Computer-Vision, Robotics, Graphical User Interface.

Minimization algorithm for multiple input to two input variables

Modern society developed on the base of technology improvement. Progress in technologies based on computer, communication and automatic controls engineering all are depends on Integrated Circuit(IC). In the first half of 1990s, the electronic industry experienced an explosion in the demand for personal computers, cellular telephones, and high speed data communication devices. Vying for market share, vendors built products increasingly greater functionality, higher performance; lower cost, lower power consumption, and smaller in dimensions. To do these, vendors created highly integrated, complex systems with fewer IC devices and less printed-circuit-board (PCB) area. Minimizations of combinational logic functions before implementation in hardware have many advantages. A reduced number of gates considerably decreases the cost of the hardware, reduces the heat generated by the chip and most importantly increases the speed. Boolean functions may be simplified by algebraic means by applying the basic laws and theorems. However, this procedure is awkward because it lacks specific rules to predict each succeeding step in the minimization process for multi-input variables. The simplification by K-mapping has many disadvantages of redundant grouping and non-unique solution. But no method is effective for the simplification of Boolean functions, if it involves more than six variables. A few algorithm and modified technique are found in literature. This paper proposes an algorithm for reduction from multi input into two input variables.

Multiple Inputs Combinational Logic Minimization by Minterms Set

The paper presents an easy technique to simplify multiple inputs combinational digital logic circuits. By grouping of minterms in different sets, multiple inputs can be easily synthesized. The proposed technique is an exact method of minimization. The new approach reduces the minimization complexity of combinational circuits. The proposed method is fast, can be solved by paper–pen, and also by computer programming.

Active Exoskeleton Hand Exerciser Using Multisensory Feed Back

Nowadays the leading cause of disability is stroke. The main reasons of cerebra vascular accident counted as Ischemia or Haemorrhage in the brain which ultimately results in stroke. It is widely agreed that natural recovery as well as functional recovery of the body takes place in the first month of the incident of the stroke victim. For a better improvement some organisation for neuroscience has need to be put in order. Neural pathways which are damaged earlier can be reformed with neurones present in activity and also can be engaged. The exoskeleton hand exerciser may be used for guidance or training device for patients following stroke to vigorously train their affected hand functions in normal condition. For different kind of disabilities there are different actuation and control techniques. Exoskeleton hand exerciser is a prosthetics device for paralyzed patients who have lost their control over hand. It is very useful thing by which they can easily do their works. Not only for the paralyzed people it is now very useful for military or forces. It can easily lift the heavy weighs of different weapons. This paper also explores the art of the exoskeleton exerciser for the palm.

Design of compact bandpass filter for WiMAX and UWB application using asymmetric SIRs and DGS

This paper considers a novel compact tri-band microstrip bandpass filter, the design of which employs asymmetric SIRs and DGS for achieving the characteristics of low insertion loss, high selectivity, wider range of bandwidth, and low group delay for 2.5/3.4 GHz (WiMAX) and 4.14–5.32 GHz (UWB) bands. The novel filter design implies the intentional selection of impedance ratio R and the length of the microstrip of asymmetric SIRs; in addition, DGS is used to improve the coupling strength of the last band. The scattering parameters of the three passbands have the following values: insertion losses S21 are–0.26/–0.07/–0.05 dB, and return losses S11 are–11.29/–19.25/–22.64 dB, respectively. The response of the filter was simulated using Ansoft HFSS simulator.

Compact CPW-fed tri-band antenna with a defected ground structure for GSM, WLAN and WiMAX applications

In this paper we propose and investigate a unique compact FR4 based CPW-fed tri-band antenna for wireless applications. The antenna comprises frequency shifting strips and a defected ground structure (formed by combining of metallic strips and cutting of an L-shaped slot from the ground). The proposed antenna provides three different impedance bandwidths of 0.57, 0.98 and 1.59 GHz which are sufficient to cover the frequency band of GSM 1800/1900, WLAN 5.5/5.8 GHz and WiMAX applications. The developed antenna has a size of 17-20 mm and operates over frequency ranges 1.50–2.08, 5.25–6.23 and 9.10–10.69 GHz centered at 1.702, 5.802 and 10.102 GHz, respectively. The antenna was designed and simulated using Ansoft HFSS software. The antenna’s characteristics such as reflection coefficient, radiation pattern, impedance bandwidth and VSWR are presented.

A New Compact Dual Band Microstrip BPF for GSM (1.8GHz) and WiMAX Using Asymmetric Stepped Impedance Resonators

We propose a design of a compact dual-bandpass microstrip filter (DBPF) for the GSM (1.8 GHz) and WiMAX (3.4 GHz) application using asymmetric SIRs. The presented filter has very low insertion loss (S21) and high selectivity for the desired band. Appearance of transmission zeroes near the edges of passband in the proposed design guarantees sharp cut off frequency and improves the selectivity of proposed band pass filter with fractional bandwidth (FBW) of 10 and 7.08 %.The proposed filter has low insertion losses, (S21) −0.24 and 0.14 dB and the return losses, (S11) −14.71 dB and −25.01 dB for the center frequencies 1.8 GHz and 3.4 GHz, respectively.

Low-Cost Crash Protection System for Heavy Motor Vehicles

This paper proposes the use of an ultrasonic sensor module which is used to calculate the ground clearance of a heavy motor vehicle (HMV). The sensor calculates distance based on the estimation of the travelling time of an ultrasonic pulse, transmitted by an ultrasonic sensor, which gets reflected back from the ground. These low-cost sensors seem ideal to be housed underneath HMVs running in hilly areas with narrow roads, which have the risk of falling off the cliffs in sharp turns. The sensors will be placed such that whenever the vehicle’s rear wheel senses a height more than that of the wheel by a considerable amount, the vehicle will move away from the cliff and the automatic braking system will be activated. The system may be used similarly in dumper HMVs that need to fill large shallow holes with mud, sand, etc.; the sensor will be placed differently in such condition.

Design a compact tri-band band pass filter using asymmetric SIRs and DGS

In this research, a novel compact tri-band microstrip bandpass Filter is design using Asymmetric SIRs and DGS to achieved the characteristic of low insertion loss, high selectivity, wider range of bandwidth, low group delay for WiMAX (2.5GHz), WiMAX (3.4GHz) and UWB applications. The novel filter is design intentionally selecting the impedance ration(R) and length of the microstrip of the asymmetric SIRs and DGS is used to improve the coupling strength of the last band. The measurement entities of the novel filter for WiMAX (2.5GHz), WiMAX (3.4GHz) and UWB (4.12-5.32GHz) are insertion losses (S21) are -0.26dB, -0.07dB, -0.05dB, and return losses (S11) are -11.29dB, -19.25dB and -22.64dB respectively. The response of the filter was simulated using Ansoft HFSS Simulator.