NNEval: Neural network based evaluation metric for image captioning

Sharif, N., White, L., Bennamoun, M. and Shah, S.A.A. (2018) NNEval: Neural network based evaluation metric for image captioning. In: Ferrari, V., Hebert, M., Sminchisescu, C. and Weiss, Y., (eds.) Computer Vision – ECCV 2018. Springer, Cham, pp. 39-55.

Abstract

The automatic evaluation of image descriptions is an intricate task, and it is highly important in the development and fine-grained analysis of captioning systems. Existing metrics to automatically evaluate image captioning systems fail to achieve a satisfactory level of correlation with human judgements at the sentence level. Moreover, these metrics, unlike humans, tend to focus on specific aspects of quality, such as the n-gram overlap or the semantic meaning. In this paper, we present the first learning-based metric to evaluate image captions. Our proposed framework enables us to incorporate both lexical and semantic information into a single learned metric. This results in an evaluator that takes into account various linguistic features to assess the caption quality. The experiments we performed to assess the proposed metric, show improvements upon the state of the art in terms of correlation with human judgements and demonstrate its superior robustness to distractions.

Item Type:	Book Chapter
Publisher:	Springer, Cham
Copyright:	© 2018 Springer Nature Switzerland AG
Other Information:	Part of the Lecture Notes in Computer Science book series (LNCS, volume 11212)
URI:	http://researchrepository.murdoch.edu.au/id/eprint/50047

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