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Re:Fast and Accurate Document Detection for Scanning by hahaker on Tuesday August 09, 2016 @03:17PM (#12257081)
Obviously it is a convolutional neural net. Here you can find source code for one of the latest work:

https://github.com/s9xie/hed

Re:Fast and Accurate Document Detection for Scanning by saverio-murgia on Tuesday August 09, 2016 @05:48PM (#12257945)
Not so obvious. In fact, I believe they are using Random Forest.
Re:Fast and Accurate Document Detection for Scanning by hahaker on Wednesday August 17, 2016 @05:01PM (#12308432)
Good point