Augmented camera previews for the Dropbox Android Document Scanner

With Dropbox’s document scanner, a user can take a photo of a document with their phone and convert it into a clean, rectangular PDF. In our previous blog posts (Part 1, Part 2), we presented an overview of document scanner’s machine learning backend, along with its iOS implementation. This post will describe some of technical challenges associated with implementing the document scanner on Android.

We will specifically focus on all steps required to generate an augmented camera preview in order to achieve the following effect:

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