Journal Articles
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/19884
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Item A Nested Texture Inspired Novel Image Pattern Based Optical Camera Communication(Institute of Electrical and Electronics Engineers Inc., 2022) Salvi, S.; Geetha, V.Pattern recognition is a vital component of display-based optical camera communication. However, as the distance between the transmitter LED panel and the receiver camera increases, the visibility of the pattern reduces. Decoding each pattern requires extensive computational resources. This paper proposes a nested texture-inspired novel binary hierarchical image pattern classification-based modulation for optical camera communication to provide efficient pattern classification and achieve longer communication distance. Custom 8× 8 patterns are generated at the transmitter based on input data using nested outer and inner patterns. On the receiver side, multi-threaded pattern matching is performed simultaneously for inner and outer patterns for faster decoding. A simulator is built to test the performance of linear search and two variants of binary search for pattern matching. A hardware prototype and Matlab app are designed to perform experiments to test the performance of the proposed technique in a real-world environment. Experiments were conducted to select optimal camera parameter values for the best signal to noise ratio (SNR) and to analyze the impact of pattern intensity profile on decoding at various distances. The proposed pattern communication technique showcased 48.6% and 42.5% improvement in bit error ratio (BER) compared to Data Matrix and QR Code Pattern-based communication techniques, respectively. © 2013 IEEE.Item Hop count, ETX and energy selection-based objective function for image data transmission over 6LoWPAN in Internet of Things(Inderscience Publishers, 2024) Bhat, A.; Geetha, V.Internet of Things (IoT) is a technology which connects millions of things to the internet for collecting data and controlling things. 6LoWPAN is designed with the idea to connect resource-constrained IoT devices. The current design of 6LoWPAN poses several challenges to support multimedia IoT devices such as cameras and audio recorders. This paper addresses one of the challenges in the area of parent selection with a new hop count, ETX and energy selection-based Objective Function (OF) for multimedia data traffic. The performance of the proposed OF is compared with existing OF with respect to packet delivery ratio, control traffic overhead, energy consumption and latency running simulations on different topologies in Cooja. The results of the simulations indicate the proposed OF performs better than existing methods in all the areas measured. Experimental results mention that the proposed HEE-OF improves PDR, overhead and energy parameters by 4%, 6% and 3%, respectively. © 2024 Inderscience Enterprises Ltd.