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Granulated mask RCNN and eye detection index (EDI) for detection and localization of eye of tropical cyclone from satellite imagery

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Abstract

The eye usually located at the center of the tropical cyclone is connected to the rapid intensification of tropical cyclone and prediction of its track and intensity. The problem of its localization and detection from satellite imagery in deep learning framework is considered here, where the study conducted deals with 35 named tropical cyclones of different categories over the Bay of Bengal and the Arabian Sea of the North Indian Ocean (NIO). Mask region-based convolutional neural network (MRCNN), which is a variant of RCNN with an addition of a mask branch that produces a mask around the detected object, is considered as the backbone architecture. Since deep learning is time-consuming, we propose embedding the concept of granular computing into MRCNN to speed up its learning mechanism. The granulated mask region-based convolutional neural network (G-MRCNN), thus developed, provides better object(s) localization and increases eye detection accuracy, apart from speedy learning. Two novel indices for eye detection, viz, compactness and eye detection index (EDI), are defined incorporating the shape, area, and compactness (circular) of the predicted mask as well as the detection score. The larger the value of EDI, the more circular and compact the shape of the eye region, and the better the prediction. Different types of granulations ranging from regular to arbitrary shapes have been incorporated in G-MRCNN and the prediction accuracy of each model has been compared against a set of testing data as well as during the time of validation using the aforesaid two indices. EDI is seen to reflect well the eye detection performance, as also judged visually. In that sense it is unique. The results reveal that the performance of the G-MRCNN with k-means (k = 5) clustering-based granulation is better than other methods for the detection and localization of the eye of the tropical cyclone over NIO. The prediction skill of the model is then validated with 4 named tropical cyclones of extremely severe, very severe, and severe categories over NIO.

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The corresponding author will provide data supporting the findings of this study upon reasonable request.

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Acknowledgements

The work was done when Prof. S.K. Pal held a National Science Chair, SERB-DST, Govt. of India.

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SERB-National Science Chair, Govt. of India, awarded to Prof. Sankar K. Pal.

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Correspondence to Debashree Dutta.

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Pal, S.K., Biswas, S. & Dutta, D. Granulated mask RCNN and eye detection index (EDI) for detection and localization of eye of tropical cyclone from satellite imagery. J. of Data, Inf. and Manag. (2024). https://doi.org/10.1007/s42488-024-00128-x

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  • DOI: https://doi.org/10.1007/s42488-024-00128-x

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