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Pen, whiteboard and slide data

Details about the collection, pre-processing, and file formatting of auxiliary data, i.e. output from handwritten notes, whiteboard, and PowerPoint slides

Collection
To capture auxiliary data, a separate capture PC is used, which reads the MIDI Time Code generated by the MTP-AV to accurately time-stamp the data and ensure it is synchronized with the audio and video streams.

Handwritten notes
Each participant has access to a Logitech I/O digital pen throughout the scenario. The pen stores the time stamped x-y co-ordinates of any pen strokes made on special paper that contains an embedded 2D bar code. The pen strokes are then downloaded to the auxiliary capture PC as xml files for subsequent processing. The pens are synchronized to the auxiliary capture PC at the beginning and end of each meeting. Since they are not connected to the synchronization equipment during the meeting, precise calibration cannot be guaranteed. In practice, the pens' internal clocks do not drift by more than a few seconds during each meeting, resulting in sufficiently calibrated data.

Whiteboard
An eBeam System 2 digital whiteboard is used to capture any pen strokes the participants make. These are stored in XML format as time stamped x-y coordinates of the pen.

Beamer
Any slides presented on the beamer are captured via a VisionRGB-Pro VGA capture card, installed in the auxiliary capture PC and stored as JPEG images. Each image is time-stamped using the MTC for accurate integration with other data streams.

Pre-processing
The XML files generated by the E-Beam whiteboard capture system and the Logitech IO pens are converted into JPEG images showing what the participants wrote. A DIV-X movie of these files, synchronized with the audio and video recordings is also produced. This shows when the strokes were made, and whether it was done on the whiteboard or in the participant's notebook. A transcription of written data is also generated using an optical character recognition technique based on Liwicki and Bunke (2005). Optical character recognition based on the technique described in Chen et al. (2004) is used to produce transcriptions of the captured slides. This, along with the captured JPEG images and the HTML pages to which they are attached forms the pen and whiteboard data component of the database.

File Formats
For an explanation of AMI meeting IDs, see AMI Corpus Meeting IDs Explained.

Pen data
When available, data from participants' handwritten notes are stored alongside the meeting's audio and video files in the /pens subdirectory. For each page of written notes, there should be three files with AVI, JPEG, and PEN extensions. File IDs take the form [meetingID].pen[1-4]-Page[0-9][0-9][0-9]_[0-9][0-9].[0-9][0-9].200[0-9]. The four numbers after ‘Page’ correspond to the notebook page number. This is followed by an underscore and the date the meeting took place, e.g. ‘03.10.2005’. AVI files are video clips that show a re-drawing of all pen stroke sequences for a given page (although not in the same time as the original event). Still images showing a page of notes are stored in JPEG files. Raw pen data may be found in XML files with the PEN extension.

Whiteboard data
Whiteboard data can be found in a meeting's /whiteboard subdirectory, and also consist of a set of AVI, JPEG, and XML files. File IDs are very straightforward, taking the form [meetingID].strokes. As described above for pen data, AVI files encode short video clips in which pen stroke sequences are redrawn. Still images of whiteboard content are stored in JPEG files, and raw whiteboard data are in XML files.

Slide data
The "slides" directory contains JPEG files that are screenshots of the automatically captured projection. A software was integrated into the system to automatically detect the slide changes. Associated plain text files are the automatic optical character recognition outputs. A set of HTML files allows to quickly browse the slides on a web browser; two XML files are for use in JFerret browser.