Understanding Mobile GUI: from Pixel-Words to Screen-Sentences

• URL: http://arxiv.org/abs/2105.11941v1
• Date: Tue, 25 May 2021 13:45:54 GMT
• Title: Understanding Mobile GUI: from Pixel-Words to Screen-Sentences
• Authors: Jingwen Fu, Xiaoyi Zhang, Yuwang Wang, Wenjun Zeng, Sam Yang and Grayson Hilliard
• Abstract summary: We propose a mobile GUI understanding architecture: Pixel-Words to Screen-Sentence (PW2SS) Pixel-Words are defined as atomic visual components, which are visually consistent and semantically clear across screenshots. We are able to make use of metadata available in training data to auto-generate high-quality annotations for Pixel-Words.
• Score: 48.97215653702567
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The ubiquity of mobile phones makes mobile GUI understanding an important task. Most previous works in this domain require human-created metadata of screens (e.g. View Hierarchy) during inference, which unfortunately is often not available or reliable enough for GUI understanding. Inspired by the impressive success of Transformers in NLP tasks, targeting for purely vision-based GUI understanding, we extend the concepts of Words/Sentence to Pixel-Words/Screen-Sentence, and propose a mobile GUI understanding architecture: Pixel-Words to Screen-Sentence (PW2SS). In analogy to the individual Words, we define the Pixel-Words as atomic visual components (text and graphic components), which are visually consistent and semantically clear across screenshots of a large variety of design styles. The Pixel-Words extracted from a screenshot are aggregated into Screen-Sentence with a Screen Transformer proposed to model their relations. Since the Pixel-Words are defined as atomic visual components, the ambiguity between their visual appearance and semantics is dramatically reduced. We are able to make use of metadata available in training data to auto-generate high-quality annotations for Pixel-Words. A dataset, RICO-PW, of screenshots with Pixel-Words annotations is built based on the public RICO dataset, which will be released to help to address the lack of high-quality training data in this area. We train a detector to extract Pixel-Words from screenshots on this dataset and achieve metadata-free GUI understanding during inference. We conduct experiments and show that Pixel-Words can be well extracted on RICO-PW and well generalized to a new dataset, P2S-UI, collected by ourselves. The effectiveness of PW2SS is further verified in the GUI understanding tasks including relation prediction, clickability prediction, screen retrieval, and app type classification.

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