Image captioning is a process of generating textual descriptions of images. In recent years, research on publicly available large-scale datasets and deep learning-based algorithms has promoted the development of this field. However, little research has been conducted on captioning images of drug-related paraphernalia that, despite being an important topic for both drug prevention and police enforcement, is not covered by existing image captioning studies. In this paper, we propose DrunaliaCap-a deep learning-based system for autogenerating both “factual” (what is in the image) and “functional” (the usage of each paraphernalia during drug-taking) descriptions of images of drug-related paraphernalia. We constructed a new dataset containing 20 categories of drug-related items and trained deep learning-based models for the proposed system. We further proposed a method to evaluate and optimize the generation of captions to prevent them from missing important knowledge. Experiments were conducted to validate the performance of the newly proposed dataset and method. We analyzed the experimental results and discussed the significance, limitations, and potential applications of our work.
