Ph.D, B-Tech

Dr. Ramkumar N. currently serves as an Assistant Professor at the Amrita Center for Wireless Networks & Applications (Amrita WNA), Amritapuri Campus.


  • 2019 : Ph. D.
    Amrita Vishwa Vidyapeetham


Publication Type: Journal Article

Year of Publication Title


N. Ramkumar, P. Rangan, V., Uma Gopalakrishnan, and Balaji Hariharan, “Gesture triggered, dynamic gaze alignment architecture for intelligent eLearning systems”, Journal of Intelligent and Fuzzy Systems, vol. 32, pp. 2963-2969, 2017.[Abstract]

Current eLearning systems enable streaming of live lectures to distant students facilitating a live instructor-student interaction. However, studies have shown that there exists a marked divide in local students' (student present in the teacher's location) experience as compared to distant students'. One of the major factors attributing to this rift is lack of gaze aligned interaction. In this paper, we present a system architecture that receives gesture triggers as input, and dynamically calculates the perspective angle to be captured of the speaking participant, for the listener, facilitating eye contact. The gesture triggers are calculated using Microsoft Kinect sensor which extracts skeleton joint information of the instructor, and performs gesture recognition with the acquired joint information real-time. This serves as interaction-initiation triggers for dynamic perspective correction for gaze alignment during a conversation. For evaluation, we constructed a five classroom test-bed with dynamic perspective correction and user study results indicate a marked 42 enhancement in experience with the gaze correction in place. © 2017-IOS Press and the authors. All rights reserved. More »»


Uma Gopalakrishnan, Ramkumar, N., P. Rangan, V., and Balaji Hariharan, “Multilayered presentation architecture in intelligent eLearning systems”, Advances in Intelligent Systems and Computing, vol. 530, pp. 533-541, 2016.[Abstract]

eLearning systems have become essential in enabling lectures from experts accessible to masses spread across distant geographic location. The digital representation of different components in the instructor’s environment, such as the presentation screen and the instructor’s video, in a remote location is often spatially disconnected. This results in missing out spatially related gestural cues such as pointing at the screen by the instructor. This paper discusses a method of creating a spatially connected, close to natural view of the instructor’s environment by overlaying the instructor’s video defined by his contour over the presentation screen content. This technique involves a calibration step required to match the camera perspectives of the different video components. We present a real-time and robust calibration technique allowing for automatic recalibration in a dynamic classroom scenario which involves changes in camera position and pan, tilt and zoom parameters. © Springer International Publishing AG 2016. More »»
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