DIZI: A Digital Ink Zooming Interface for Document Annotation [chapter]

Maneesh Agrawala, Michael Shilman
2005 Lecture Notes in Computer Science  
Pen computing devices provide a natural interface for annotating documents with freeform digital ink. However, digital ink annotations are usually larger and sloppier than real ink annotations on paper. We present DIZI, a focus+context interface that zooms up a region of the underlying document for inking. Users write in the zoomed region at a comfortable size for the device. When the zoom region is shrunk back to normal page size, the digital ink shrinks to an appropriate size for the
more » ... g document. The zoom region covers only a small portion of the screen so that users can always see the overall context of the underlying document. We describe several techniques for fluidly moving the zoom region to navigate the document. We show that DIZI allows users to create digital ink annotations that more closely mimic the look of real ink annotations on physical paper. Slip. Digital screens are smoother and slipperier than paper. Resolution. Digital screens have less visual resolution than paper. In addition, digitizers usually track digital pens at lower resolution than the finest human hand movements. Screen Size. Digital screens are often smaller than standard letter size paper. Parallax. Digital screens often contain a protective layer of plastic that creates parallax between the tip of the digital pen and the screen. Size and Weight. The physical size and weight of pen computing devices makes it hard to position and interact with them like paper. While hardware designers continue to improve the feel of pen-based devices and make them more like paper, a substantial gap remains.
doi:10.1007/11555261_9 fatcat:kvfoo5mb4zgdrmeevgs4jpmlxq