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Bakkialakshmi S.,Annamalai University | Chenthamarai S.,SDNB Vaishnav College for Women
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2013

Fluorescence quenching of Rhodamine B base (RhB) in DMF solution has been studied at different concentrations of the amine Triethyl amine (TEA) and n-butyl amine (NBA) at room temperature. It has been observed that the fluorescence intensity of RhB decrease with increase in the concentration of the TEA and NBA. It has been observed that the quenching due to amines proceeds via dynamic quenching process. The rate constants for the quenching process have been calculated using Stern-Volmer equation. Time resolved fluorescence study and 1H NMR spectral study have also been carried out and discussed. © 2012 Elsevier B.V. All rights reserved.


Dhanalakshmi C.P.,University of Madras | Vijayalakshmi L.,Sdnb Vaishnav College For Women | Narayanan V.,University of Madras
Journal of Biomaterials and Tissue Engineering | Year: 2012

Carbonated hydroxyapatite/Poly(4-vinyl pyridine-co-styrene) nano composites of varying composition for biomaterial applications have been synthesized. The Carbonated hydroxyapatite/Poly(4-vinyl pyridine-co-styrene) nano composite materials were characterized by XRD, FTIR, 31P NMR, TGA, DTA, FESEM and TEM. Carbonated Hydroxyapatite nano rod embedded composite was prepared using Poly(4-vinyl pyridine-co-styrene) as a matrix with different weight percentages (wt%). The results indicated that the size and crystallinity of Carbonated hydroxyapatite nano particles decreases with increase in Poly(4-vinyl pyridine-co-styrene) concentration in the composite. SEM confirms the presence of carbonated hydroxyapatite nano rod crystals in Poly (4-vinyl pyridine-co-styrene) matrix. Carbonated hydroxyapatite/Poly(4-vinyl pyridine-co-styrene) nano composites were screened for antimicrobial activity and anti inflammatory activity. © 2012 American Scientific Publishers. All rights reserved.


Dhanalakshmi C.P.,University of Madras | Vijayalakshmi L.,Sdnb Vaishnav College For Women | Narayanan V.,University of Madras
Journal of Bionanoscience | Year: 2012

Nano carbonated hydroxyapatite/Poly(vinyl alcohol) composites of varying composition for biomaterial applications have been synthesized. The nano Carbonated hydroxyapatite/Poly(vinyl alcohol) composite materials were characterized by XRD, FTIR, HRTEM, TGA, DTA and FESEM. Carbonated Hydroxyapatite nano rod embedded composite was prepared using poly(vinyl alcohol) as a matrix with different weight percentages (wt%). The results indicated that the size and crystallinity of Carbonated hydroxyapatite nano particles decreases with increase in poly(vinyl alcohol) concentration in the composite. SEM confirms the presence of carbonated hydroxyapatite nano rod crystals in poly(vinyl alcohol) matrix. Nano Carbonated hydroxyapatite/Poly(vinyl alcohol) composites were screened for antimicrobial activity and anti inflammatory activity. Copyright © 2012 American Scientific Publishers All rights reserved.


Sumathi C.P.,SDNB Vaishnav College For Women | Santhanam T.,DG Vaishnav College For Men | Priya N.,SDNB Vaishnav College For Women
Journal of Theoretical and Applied Information Technology | Year: 2012

Text extraction in images and video has been developing rapidly since 1990s and is an important research field in content-based information indexing and retrieval, automatic annotation and structuring of images. Extraction of this information involves detection, localization, tracking, extraction, enhancement, and recognition of the text from a given image. However, variations of text due to differences in size, style, orientation, and alignment, as well as low image contrast and complex background make the problem of automatic text extraction extremely difficult and challenging job. A large number of techniques have been proposed to address this problem and the purpose of this paper is to classify and review these techniques, discuss the applications and performance evaluation, and to identify promising directions for future research. © 2005 - 2012 JATIT & LLS. All rights reserved.


Hemalatha G.,Mononmaniam Sundaranar University | Sumathi C.P.,Sdnb Vaishnav College For Women
2016 International Conference on Information Communication and Embedded Systems, ICICES 2016 | Year: 2016

Image Preprocessing is an essential factor for any Face image, when processing it for research purpose, The need for Preprocessing is due to its variation in Lightening condition, differences in Pose, Head orientation and Expressions because the quality of an Image depend on the effectiveness of capture device like CCTV, Webcams etc. The common Preprocessing involves Color Normalization, Noise Reduction, Edge Detection and Histogram Equalization. The aim of Preprocessing is to improve the quality of the Image and to enhance the Image features for further processing. In this paper Median filter is used for Color Normalization and Noise Reduction. Gabor filter is used for Edge enhancement and Histogram Equalization for Image contrast illumination. Hence an improved quality of Image is produced by using Hybrid filters this helps for the efficiency of producing result for any research processing. © 2016 IEEE.


Sumathi C.P.,Sdnb Vaishnav College For Women | Gayathri Devi G.,Sdnb Vaishnav College For Women
Journal of Computer Science | Year: 2014

The aim of this study is to propose a new methodology for text region extraction and non text region removal from complex background colored images. This study presents a new approach based on Gamma correction by determining a gamma value for enhancing the foreground details in an image. The approach also uses gray level co-occurrence matrices, texture measures, threshold concepts. The proposed method is a useful preprocessing technique to remove non text region and to show the text region in the image. Experiments were on various images from the datasets collected and tagged by the ICDAR robust reading dataset collection team. Experimental results show that the proposed method has a good performance on extracting text regions in an image. © 2014 Science Publications.


Gayathri B.M.,Sdnb Vaishnav College For Women | Sumathi C.P.,Sdnb Vaishnav College For Women
2015 IEEE International Conference on Computational Intelligence and Computing Research, ICCIC 2015 | Year: 2015

Diagnosing various diseases in medical field is very difficult even for medical expert. For solving this problem data mining was introduced. It discovers knowledge from the database. There are many subfields in data mining. One of the subfield is fuzzy logic. It is applied in many fields such as control theory, Artificial Intelligence (AI) and also in the field of medicine. This paper focuses on detecting the risk of breast cancer by using fuzzy logic. The dataset used in this work is retrieved from UCI machine learning repository. The aim of this proposed work is to detect the breast cancer by reducing the variables, so that it reduces the time taken for diagnosing the disease. The features were extracted by using one of the feature selection method called Linear Discriminant Analysis (LDA) and training is done by using one of the fuzzy inference method called Mamdani Fuzzy inference model. The results were evaluated by using the above model. It gave the result of 93%. © 2015 IEEE.


Sumathi C.P.,SDNB Vaishnav College for Women | Priya S.N.,SDNB Vaishnav College for Women
2013 International Conference on Information Communication and Embedded Systems, ICICES 2013 | Year: 2013

Text embedded in image provides high-level semantic information for automatic annotation, indexing and retrieval. Extraction of text is difficult due to the complex background in image, font size, shape, orientation, as well as color variance, and these make it a challenging task. In recent years many methods have been proposed for text extraction in different images. In this paper the comparative evaluation analysis of various text extraction techniques is presented. It has been shown that the Morphological - Region combined algorithm is computationally more expensive and performs better than the texture based and multi-scale edge based text extraction methods under almost all scenarios. © 2013 IEEE.


Sumathi C.P.,SDNB Vaishnav College for Women | Mahadevi M.,SDNB Vaishnav College for Women
Proceedings - 2014 International Symposium on Biometrics and Security Technologies, ISBAST 2014 | Year: 2015

Skin color detection plays an important phase in identifying the face in images. Detecting face has become difficult because of the complexity in facial features and the similarity between those features. To identify a face, one of the basic step is to segment the image based on skin color. The main objective of the paper is to find a color model which is more suitable and shows a good performance in detecting a face. This paper compares each of the skin color models namely HSV, YCBCR, Lab for better accuracy. On such comparison, a hybrid skin color model is derived by combining the suitable color component from the three skin color models. After Morphological operations and using connected components a face is detected. After experiments it is observed that the Hybrid color model based skin detection is more suitable with an accuracy of 93%. © 2014 IEEE.


Santhanam T.,DG Vaishnav College | Chithra K.,SDNB Vaishnav College for Women
2014 International Conference on Information Communication and Embedded Systems, ICICES 2014 | Year: 2014

Image denoising is an important pre-processing step in image analysis. Developing the denoising algorithm is a difficult task because information must be preserved while removing the noise from the images. In this paper, a new Decision Based Unsymmetric trimmed median filter using Euclidean distance measure is proposed for the removal of Salt and Pepper noise from a gray scale images. The proposed algorithm replaces the noisy pixel by trimmed median value of uncorrupted pixels which are having minimum Euclidian distance between processing pixel and surrounding pixels. When all the pixels are 0's and 255's then the noisy pixel is replaced by mean value. The performance of the proposed algorithm is compared with the MDBUTMF using PSNR (Peak Signal to Noise Ratio). The proposed filter is experimented with different noise density in Lena image, Left iris image, Right iris image and Plant image in JPG/JPEG (Joint Photographic Experts Group) format. The results of the proposed algorithm shows a significant improvement in comparison with MDBUTMF filter even if the noise density in very high with better PSNR values. © 2014 IEEE.

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