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摘要
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Recently, images and videos have replaced text as the main social objects on social software. When the visually impaired use social software, they will be troubled by pictures without alt text. Facebook has launched an automatic alt text system, which still has a lot of room for improvement. After exploring the Audio Description service that provides visual information for the visually impaired, this research proposes that the alt text of posts should be adjusted according to the types of posts. This research found that since successive posts spend a smaller proportion of the text explaining the image information, the posts are suitable for specific alt text. The text of the illustrated post contains a lot of image information, so these posts are appropriate for specific or abstract alt text. The research results are compiled into a flowchart of the different ways of producing alt text provides a reference for future related research or the development of related services.
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