Diagrams often appear as node-link representations in many contexts, such as taxonomies, mind maps and networks in textbooks. Despite their pervasiveness, they present significant accessibility challenges for blind and low-vision people. To address this challenge, we introduce Touch-and-Audio-based Diagram Access (TADA), a tablet-based interactive system that makes diagram exploration accessible through musical tones and speech. We designed and developed TADA informed by insights gained from an interview study with 15 participants who shared their challenges and strategies for accessing diagrams. TADA enables people to access a diagram by: i) engaging in open-ended touch-based explorations, ii) allowing searching of specific nodes, iii) navigating from one node to another and iv) filtering information. We evaluated TADA with 25 participants and found that it can be a useful tool for gaining different perspectives about the diagram and participants could complete several diagram-related tasks.

翻译：图表常以节点-连线形式出现在多种场景中，例如教科书中的分类图、思维导图和网络图。尽管它们广泛存在，但给盲人和低视力人群带来了显著的可访问性挑战。为解决这一问题，我们提出基于触摸和音频的图表访问系统（TADA），这是一种基于平板电脑的交互系统，通过音乐音调和语音实现图表探索的可访问性。我们通过一项包含15名参与者的访谈研究获取洞见，了解了他们在访问图表时面临的挑战和应对策略，并据此设计并开发了TADA。该系统支持用户通过以下方式访问图表：i）进行开放式触摸探索，ii）搜索特定节点，iii）在节点间导航，以及iv）过滤信息。我们通过25名参与者对TADA进行了评估，发现它可作为从不同角度理解图表的有效工具，且参与者能够完成多项与图表相关的任务。