Optimizing Topic Distributions of Descriptions for Image Description Translation

摘要

Image Description Translation (IDT) is a task to automatically translate the image captions (i.e., image descriptions) into the target language. Current statistical machine translation (SMT) cannot perform as well as usual in this task because there is lack of topic information provided for translation model generation. In this paper, we focus on acquiring the possible contexts of the captions so as to generate topic models with rich and reliable information. The image matching technique is utilized in acquiring the relevant Wikipedia texts to the captions, including the captions of similar Wikipedia images, the full articles that involve the images and the paragraphs that semantically correspond to the images. On the basis, we go further to approach topic modelling using the obtained contexts. Our experimental results show that the obtained topic information enhances the SMT of image caption, yielding a performance gain of no less than 1% BLUE score.