Recording lectures is a normal task for online educators, and a graphics tablet is a great tool for that. However, it is very expensive for many instructors. In this paper, we propose an alternative called "DIY Graphics Tab" that functions largely in the same way as a graphic tab, but requires only a pen, paper, and laptop's webcam. Our system takes images of writings on a paper with a webcam and outputs the contents. The task is not straightforward since there are obstacles, such as hand occlusion, paper movements, lighting, and perspective distortion due to the viewing angle. A pipeline is used that applies segmentation and post-processing for generating appropriate output from input frames. We also conducted user experience evaluations from the teachers.
翻译：记录讲座是在线教育者的一项正常任务,图形平板是这方面的一个绝佳工具。 但是,这对许多教官来说费用非常昂贵。 在本文中,我们提出了一个称为“DIY图形塔布”的替代方案,它基本上与图形标签一样运作,但只需要一支笔、纸和笔记本电脑的网络摄像头。我们的系统在带有网络摄像头的纸上拍摄写作的图像,并将内容输出出来。任务并不简单,因为存在障碍,如手隔离、纸张移动、照明和视窗扭曲等,因为观察角度造成障碍。我们用管道进行分解和后处理,从输入框中产生适当的产出。我们还从教师那里进行了用户经验评估。
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