Ravi J

Work place: Department of ECE Global Academy of Technology, Bangalore-560098, Karnataka, India

E-mail: gnkereravi@gmail.com


Research Interests: Image Processing, Signal Processing, Biometrics


Dr. Ravi J is a Professor in the Department of Electronics and Communication Engineering, Global Academy of Technology, Bangalore. He obtained his BE Degree in Instrumentation Technology from Bangalore University, Bangalore. His specialization in Master degree was Digital Electronics from Visvesvaraya Technological University, Belagavi.

He was awarded PhD in Electronics and Communication Engineering from JNTU Anantapur. He has over 30 research publications in refereed International Journals and Conference Proceedings. His research interests include Image Processing, Biometrics, VLSI, Signal Processing and computer networks. He is life member of IETE, ISTE, and ISAMP. He is life member of IETE, ISTE, and ISAMP.

Author Articles
Face Recognition Using Modified Histogram of Oriented Gradients and Convolutional Neural Networks

By Raveendra K Ravi J Khalid Nazim Abdul Sattar

DOI: https://doi.org/10.5815/ijigsp.2023.05.05, Pub. Date: 8 Oct. 2023

We are aiming in this work to develop an improved face recognition system for person-dependent and person-independent variants. To extract relevant facial features, we are using the convolutional neural network. These features allow comparing faces of different subjects in an optimized manner. The system training module firstly recognizes different subjects of dataset, in another approach, the module processes a different set of new images. Use of CNN alone for face recognition has achieved promising recognition rate, however many other works have showed declined in recognition rate for many complex datasets. Further, use of CNN alone exhibits reduced recognition rate for large scale databases. To overcome the above problem, we are proposing a modified spatial texture pattern extraction technique namely modified Histogram oriented gradient (m-HOG) for extracting facial image features along three gradient directions along with CNN algorithm to classify the face image based on the features. In the preprocessing stage, the face region is captured by removing the background from the input face images and is resized to 100×100. The m-HOG features are retrieved using histogram channels evenly distributed between 0 and 180 degrees. The obtained features are resized as a matrix having dimension 66×198 and which are passed to the CNN to extract robust and discriminative features and are classified using softmax classification layer. The recognition rates obtained for L-Spacek, NIR, JAFFE and YALE database are 99.80%, 91.43%, 95.00% and 93.33% respectively and are found to be better when compared to the existing methods.

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Performance Evaluation of Face Recognition system by Concatenation of Spatial and Transformation Domain Features

By Raveendra K Ravi J

DOI: https://doi.org/10.5815/ijcnis.2021.01.05, Pub. Date: 8 Feb. 2021

Face biometric system is one of the successful applications of image processing. Person recognition using face is the challenging task since it involves identifying the 3D object from 2D object. The feature extraction plays a very important role in face recognition. Extraction of features both in spatial as well as frequency domain has more advantages than the features obtained from single domain alone. The proposed work achieves spatial domain feature extraction using Asymmetric Region Local Binary Pattern (ARLBP) and frequency domain feature extraction using Fast Discrete Curvelet Transform (FDCT). The obtained features are fused by concatenation and compared with trained set of features using different distance metrics and Support Vector Machine (SVM) classifier. The experiment is conducted for different face databases. It is shown that the proposed work yields 95.48% accuracy for FERET, 92.18% for L-space k, 76.55% for JAFFE and 81.44% for NIR database using SVM classifier. The results show that the proposed system provides better recognition rate for SVM classifier when compare to the other distance matrices. Further, the work is also compared with existing work for performance evaluation.

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